JP2023161854A - Conveyance dolly coupling device - Google Patents

Abstract

To achieve, with a simple structure, movement and coming-off prevention of a coupling pin.SOLUTION: A conveyance dolly coupling device 10 includes: a dolly coupling frame 21 attached to a towing vehicle 11; an operation mechanism 51 provided on a dolly coupling frame 21 so as to be operable; and a coupling pin 36. The connection pin 36 is provided in the dolly coupling frame 21 and is moved, by an operation of the operation mechanism 51, between a coupling position where the coupling pin is inserted into a to-be-coupled portion 16 to couple the conveyance dolly 15 to the towing vehicle 11 and a coupling release position where the coupling pin is pulled out of the to-be-coupled portion 16 to release the coupling. At least one of the dolly coupling frame 21, the operation mechanism 51, and the coupling pin 36 has a coming-off prevention structure that holds the coupling pin 36 at the coupling position when the conveyance dolly 15 is coupled to the towing vehicle 11 and regulates movement of the coupling pin 36 from the coupling position to the coupling release position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transport vehicle coupling device for connecting a transport vehicle to a towing vehicle.

In order to tow and transport a transportation vehicle provided with an annular connected portion by a towing vehicle, a transportation vehicle coupling device including a connecting pin is used. In the transport vehicle coupling device, the connection pin is moved between a connection position where the pin is inserted into the connected portion and connects the transport vehicle to the towing vehicle, and a connection release position where the pin is removed from the connected portion and releases the connection. The movement of the connecting pin between the connecting position and the uncoupling position is performed, for example, by manual operation in Patent Document 1, and by electric operation in Patent Document 2, for example.

Japanese Patent Application Publication No. 2013-147208 Japanese Patent Application Publication No. 2019-131046

However, the transport vehicle coupling device described in Patent Document 1 does not have a sufficient slip-off prevention function to prevent the coupling pin from moving from the connection position to the uncoupling position when the transport vehicle is connected to the towing vehicle. The problem is that it is not. On the other hand, the transport vehicle coupling device described in Patent Document 2 has a problem in that both the structure for moving the coupling pin and the structure for preventing the coupling pin from coming off are complicated.

A transport vehicle coupling device that solves the above problems is a transport vehicle coupling device that connects a transport vehicle provided with a connected portion to a towing vehicle and releases the connection, the vehicle coupling device being attached to the towing vehicle. a frame, an operating mechanism operably provided on the cart connecting frame, and an operating mechanism provided on the cart connecting frame and inserted into the connected portion by at least the operating mechanism of the cart connecting frame and the operating mechanism. and a connecting pin that is moved between a connecting position where the carrier is connected to the towing vehicle and a disconnecting position where the conveying truck is released from the connected portion and the connection is released, the truck connecting frame, the operating mechanism, and At least one of the connection pins holds the connection pin in the connection position when the transport vehicle is connected to the towing vehicle, and restricts movement of the connection pin from the connection position to the connection release position. It has a locking structure.

According to the above configuration, when the connecting pin is located at the connecting position, the connecting pin is inserted into the connected portion of the transport vehicle. The transport vehicle is connected to the towing vehicle via the connected portion, the connection pin, and the vehicle connection frame.

On the other hand, when the connecting pin is located at the disconnected position, the connecting pin comes out of the connected portion. The connection of the transport vehicle to the towing vehicle is released.
Movement of the connection pin between the connection position and the connection release position is realized by at least the operation mechanism of the truck connection frame and the operation mechanism.

Further, when the transport vehicle is connected to the towing vehicle, the connecting pin is held in the connecting position by the retaining structure. The connecting pin is prevented from moving from the connecting position to the disconnecting position and coming out of the connected portion. The above-mentioned slip-off prevention structure is realized by at least one of the truck connecting frame, the operating mechanism, and the connecting pin.

Therefore, compared to electrical operation, it is possible to move the connecting pin and prevent it from coming off using fewer parts and with a simpler structure.
In the transport vehicle coupling device, the operating mechanism includes an operating lever that is operable on the trolley coupling frame, and a transmission mechanism that transmits a force applied to the operating lever to the coupling pin, The mechanism includes a wire, a fixed pulley, and a movable pulley, one end of the wire is attached to the operating lever, the other end is attached to the bogie connection frame, and the fixed pulley is attached to the bogie connection frame. Preferably, the movable pulley is rotatably supported by the connecting pin, and the wire is wound around the fixed pulley and the movable pulley.

According to the above configuration, when force is applied to the operating lever, the force is transmitted to the connecting pin via the wire, fixed pulley, and movable pulley in the transmission mechanism. The direction of the force applied to the operating lever is changed by a fixed pulley. Further, the magnitude of the force applied to the operating lever is reduced by passing the force through the movable pulley. Therefore, it becomes possible to operate the operating lever with a small force, resulting in good operability. By operating the operating lever, the connecting pin can be moved between the connecting position and the uncoupling position to connect and uncouple the transport vehicle to the towing vehicle.

In the above transport vehicle coupling device, the trolley coupling frame is rotatable relative to the vehicle frame by a vehicle frame fixed to the rear of the towing vehicle and a rotation shaft provided at its front end. It is preferable that the operating mechanism includes a supported movable frame part, the operating mechanism includes an operating lever fixed to the movable frame part, and the connecting pin is integrally formed with the movable frame part.

According to the above configuration, when force is applied to the operating lever, the force is transmitted to the movable frame portion via the operating lever. The movable frame portion rotates relative to the vehicle frame portion about a rotation axis at its front end. Along with this rotation, a connecting pin formed integrally with the movable frame portion moves between a connecting position and a disconnecting position.

In the above-mentioned transport vehicle coupling device, the trolley coupling frame includes a pin support portion having an insertion hole penetrating in the vertical direction, the coupling pin is inserted into the insertion hole so as to be vertically movable, and the retaining structure includes: A rod provided to be movable up and down with respect to the connecting pin, and a switching member supported by a support shaft with respect to the connecting pin and having an engaging claw portion, and the switching member is configured to transmit the lifting and lowering of the rod. When the rod is lowered by its own weight with respect to the connecting pin at the connecting position in response to the operation of the operating mechanism, the switching member is rotated about the support shaft. The engaging claw portion is rotated toward the side protruding from the connecting pin, so that the engaging claw portion is engaged with the peripheral portion of the insertion hole in the pin support portion from below, and the switching member When the rod is raised in response to the operation of the operating mechanism, the engaging claw portion is rotated to a side where it is recessed into the connecting pin, and the engagement of the engaging claw portion is released. is preferred.

According to the above configuration, when the rod descends due to its own weight with respect to the connection pin at the connection position in response to the operation of the operating mechanism, the descent is transmitted to the switching member. The switching member rotates toward the side where the engaging claw portion protrudes from the connecting pin. When the engaging claw portion engages the peripheral portion of the insertion hole in the pin support portion from below, the connecting pin is held in the connecting position.

On the other hand, when the rod is raised in response to the operation of the operating mechanism, the rise is transmitted to the switching member. The switching member rotates to the side where the engaging claw portion is recessed into the connecting pin. By this rotation, the engagement of the engagement claw portion with the peripheral portion of the insertion hole in the pin support portion is released. The connection pin is released from the above-mentioned holding state and becomes able to move up and down. Furthermore, when the rod is raised, it is possible to move the coupling pin into the uncoupled position.

In the transport vehicle coupling device, the coupled portion has an annular shape, the trolley coupling frame includes a pin support portion, the coupling pin is reciprocatably inserted through the pin support portion, and in the coupling position, the When a part of the connecting pin including the tip end surface of the connecting pin protrudes from the pin support part, and the forward direction of the towing vehicle is the front and the backward direction is the rear, the retaining structure is located at the connecting position. The connecting pin includes a front inclined part and a rear inclined part formed at a location adjacent to the connected part on a side closer to the tip surface, and the front inclined part is formed as it approaches the tip surface. Preferably, the tip is inclined so as to be located forward, and the rear inclined portion is inclined so as to be located rearward as it approaches the distal end surface.

According to the above configuration, when the towing vehicle moves forward with the connecting pin located at the connecting position, the front portion of the inner circumferential surface of the connected portion comes into contact with the front inclined portion of the connecting pin. The front inclined portion is inclined so as to be located forward as it approaches the distal end surface. Therefore, the connection pin is pushed toward the distal end side due to contact with the front inclined portion of the connected portion, and a phenomenon in which the connecting pin slips out of the connected portion is restricted.

Further, when the towing vehicle moves backward with the connecting pin located at the connecting position, the rear portion of the inner circumferential surface of the connected portion comes into contact with the rear inclined portion of the connecting pin. The rear inclined portion is inclined so as to be positioned rearward as it approaches the distal end surface. Therefore, the connection pin is pushed toward the distal end side due to contact with the rear inclined portion of the connected portion, and a phenomenon in which the connecting pin slips out from the connected portion is restricted.

Further, when the brake is applied to the towing vehicle that is moving forward while the connecting pin is in the connected position, the connecting pin stops moving forward, whereas the connected portion moves forward due to inertia. In this case, the rear portion of the inner peripheral surface of the connected portion comes into contact with the rear inclined portion of the connecting pin, similarly to when the towing vehicle retreats. Therefore, similarly to the above-mentioned retreat, the connecting pin is pushed toward the distal end surface side at the rear inclined portion. This prevents the connecting pin from slipping out of the connected portion.

Note that when a force is applied to the connecting pin located at the connecting position toward the uncoupling position, the front inclined part pushes the connected part forward, or the rear inclined part pushes the connected part backward while connecting. Move to the release position. The connecting pin continues to move even after the front inclined portion and the rear inclined portion pass through the connected portion, thereby moving the connecting pin to the disconnected position.

In the above-mentioned transport vehicle coupling device, the trolley coupling frame includes a lever support part, the operating mechanism includes an operating lever rotatably supported by a shaft with respect to the lever support part, and the operating lever is connected to the coupling frame. The control lever is connected to a pin in a power transmitting manner, and the operating lever has a rotation range between a first position in which the connecting pin is located in the connected position and a second position in which the connecting pin is located in the uncoupled position. The retaining structure is spanned between the lever support portion and the operating lever, and the retaining structure is capable of rotating at an intermediate position between the first position and the second position. The turnover spring reverses the direction in which the lever is biased, and when the operating lever is located between the first position and the intermediate position, the turnover spring moves the operating lever toward the first position. It is preferable that the operating lever be biased toward the second position when the operating lever is located between the second position and the intermediate position.

According to the above configuration, when the operating lever is located at the first position in the rotation range where the connecting pin is located at the connecting position, the operating lever is urged toward the first position by the turnover spring. Ru. This biasing force prevents the connecting pin from slipping out of the connected portion.

Further, when the operating lever is located at a second position in the rotation range where the connecting pin is located at the disconnection position, the operating lever is urged toward the second position by the turnover spring.

Note that when the operating lever is rotated from the first position to the second position or from the second position to the first position, the turnover spring The direction in which the control lever is biased is reversed.

In the above transport vehicle coupling device, the rotation shaft of the movable frame portion is rotatably supported by a rotation hole portion of a bearing hole provided in the vehicle frame portion, and the slip-off prevention structure includes the rotation shaft of the movable frame portion. A slide hole portion forming a part of the bearing hole, the rotation shaft, and a bending pin portion forming a part of the connection pin, the slide hole portion extending from the rotation hole portion and the rotation shaft portion forming a portion of the rotation shaft. The moving shaft is formed in a shape that can slide with respect to the slide hole in a state in which rotation is restricted and can fit into the slide hole when the connecting pin is located at the connecting position, Preferably, the bent pin portion is formed on a side including the tip end surface of the connecting pin, and is inclined so as to be positioned toward the rear as it approaches the tip end surface.

According to the above configuration, when the connecting pin at the connecting position enters the connected portion, the transport vehicle becomes connected to the towing vehicle, and the transport vehicle can be towed by the towing vehicle.
When the towing vehicle moves forward, the rotation shaft fits into the slide hole of the bearing hole. This fitting restricts the rotation of the movable frame portion about the rotation axis. The operation of the operating lever for moving the connection pin from the connection position to the connection release position is restricted.

Further, when the brake is applied to the towing vehicle that is moving forward while the connecting pin is in the connected position, the connecting pin stops moving forward, whereas the connected portion moves forward due to inertia. The rear portion of the inner circumferential surface of the connected portion contacts the bent pin portion of the connecting pin. The bending pin portion is inclined so as to be positioned toward the rear as it approaches the distal end surface. Therefore, the connecting pin is pushed toward the distal end surface at the bent pin portion. This prevents the connecting pin from slipping out of the connected portion.

Further, when the towing vehicle moves backward with the connecting pin located at the connecting position, the vehicle frame moves rearward while the connected portion and the movable frame portion remain stationary. Therefore, the rotation shaft comes out of the slide hole and moves to the rotation hole. When the towing vehicle is stopped with the rotation shaft located in the rotation hole, the movable frame portion can rotate relative to the vehicle frame portion about the rotation shaft. By operating the operating lever, it is possible to rotate the movable frame portion and remove the connecting pin from the connected portion.

According to the above-mentioned transport vehicle coupling device, movement and prevention of the coupling pin from coming off can be realized with a simple structure.

FIG. 2 is a partial perspective view showing the transport vehicle coupling device in the first embodiment together with the towing vehicle and the transport vehicle. It is a partial side view of the conveyance trolley|bogie coupling device in 1st Embodiment. (a), (b) is a partial cross-sectional view explaining the operation of the transport vehicle coupling device in the first embodiment. It is a partial perspective view which shows the conveyance trolley|bogie coupling apparatus in 2nd Embodiment, together with a tow vehicle and a conveyance trolley. It is a partial side view which shows the positional relationship of the lever support part, the operation lever, and a turnover spring in 2nd Embodiment. FIG. 7 is a partial cross-sectional view showing the positional relationship between a connecting pin, a pin support section, and an auxiliary pin support section in the second embodiment. FIG. 7 is a partial side view showing a connecting portion between an operating lever and a connecting pin in a second embodiment. It is a partial sectional view showing the slip-off prevention structure of the conveyance trolley coupling device in a 3rd embodiment. It is a partial perspective view which shows the conveyance trolley coupling device in 4th Embodiment, together with a tow vehicle etc. 10 is a partial perspective view showing a state before the rotation shaft of the movable frame portion is assembled to the bearing hole in the vehicle frame portion of FIG. 9. FIG. It is a partial sectional view showing the positional relationship between a connecting pin and a connected part in a 4th embodiment. FIG. 12 is a partial side view showing a state in which the rotation shaft is fitted into the slide hole of the bearing hole in the fourth embodiment. FIG. 9 is a partial side view showing a state in which the rotation shaft has been moved to the rotation hole portion of the bearing hole in the fourth embodiment. FIG. 6 is a diagram illustrating a modification of the second embodiment, and is a partial side view corresponding to FIG. 5 and illustrating the positional relationship of the lever support portion, the operating lever, and the turnover spring.

[First embodiment]
The transport vehicle coupling device 10 according to the first embodiment will be described below with reference to FIGS. 1 to 3.

In the following description, as shown in FIG. 1, the forward direction of the towing vehicle 11 is assumed to be the forward direction, and the backward direction is assumed to be the backward direction. Further, the vertical direction means the vertical direction of the towing vehicle 11, and the left-right direction is the vehicle width direction, which corresponds to the left-right direction when the towing vehicle 11 moves forward.

The transport vehicle coupling device 10 is provided between a towing vehicle 11 that travels within a factory or the like and a transport vehicle 15 that is towed and transported by the towing vehicle 11. The transport vehicle coupling device 10 is a device that connects and disconnects the transport vehicle 15 to the tow vehicle 11.

<Transportation truck 15>
The transport vehicle 15 is provided with a connected portion 16 that is used for connection and disconnection with the towing vehicle 11 . More specifically, a pair of connecting arms 17 extend forward from the front end of the transport vehicle 15 . The connecting arms 17 are inclined in opposite directions with respect to the front-rear direction so that the distance between the connecting arms 17 in the left-right direction is maximum at the rear end and becomes smaller toward the front. The connected portion 16 has an annular shape and is fixed to the front end portions of both connecting arms 17. In the first embodiment, the connected portion 16 has an annular shape, but may have another annular shape.

The carrier coupling device 10 includes a carrier coupling frame 21, a coupling pin 36, and an operating mechanism 51. Next, each part constituting the transport vehicle coupling device 10 will be explained.
<Bogie connection frame 21>
The bogie connection frame 21 includes a vehicle frame portion 22 at its front end, and is attached to the rear portion of the towing vehicle 11 at the vehicle frame portion 22.

As shown in FIGS. 1 and 2, the truck connection frame 21 includes an elongated pin support portion 23 extending in the front-rear direction. The pin support section 23 is fixed to the vehicle frame section 22 at its front end. An insertion hole 24 is vertically penetrated through the rear end portion of the pin support portion 23 .

The trolley connection frame 21 includes an auxiliary pin support part 25 extending in the front-rear direction at a location spaced downward from the rear of the pin support part 23 . In the auxiliary pin support portion 25, an auxiliary insertion hole 26 is vertically penetrated below the insertion hole 24. The auxiliary pin support portion 25 is connected to the pin support portion 23 by a connecting portion 27 in front of the auxiliary insertion hole 26 .

The truck connection frame 21 further includes a plurality of vertical frame parts 31, horizontal frame parts 32, lever support parts 33, and support pillar parts 34. The plurality of vertical frame portions 31 extend upward from a plurality of locations spaced apart from each other in the front-rear direction on the upper surface of the pin support portion 23, respectively.

The horizontal frame portion 32 extends in the front-rear direction at a location a certain distance upward from the pin support portion 23. The horizontal frame portion 32 is located at an intermediate portion of the plurality of vertical frame portions 31 in the vertical direction.

The lever support portion 33 extends in the front-rear direction at a location a certain distance upward from the horizontal frame portion 32. The lever support portion 33 is fixed to the upper end portions of the plurality of vertical frame portions 31. The front end portion of the lever support portion 33 is located forward of the vertical frame portion 31 located furthest forward and close to the rear with respect to the driver's seat 12. In other words, the front end of the lever support section 33 is located in an area that the driver seated in the driver's seat 12 can reach by extending his hand rearward. A shaft portion 35 extending in the left-right direction is rotatably supported at the front end portion of the lever support portion 33 .

The support column portion 34 extends upward from the rear end portion of the horizontal frame portion 32 .
<Connecting pin 36>
As shown in FIGS. 2, 3(a) and 3(b), the connecting pin 36 includes a cylindrical portion 37, a top plate portion 38, and a stopper 39. The cylindrical portion 37 has a cylindrical shape extending in the vertical direction. The cylindrical portion 37 is formed to have a smaller diameter than the insertion hole 24 and the auxiliary insertion hole 26.

The connecting pin 36 can reciprocate between a connecting position and a disconnecting position set higher than the connecting position.
As shown by the solid line in FIG. 2, in the connection position, a portion of the cylindrical portion 37 of the connection pin 36 below the stopper 39 is inserted into both the insertion hole 24 and the auxiliary insertion hole 26. A lower end surface 36a constituting a tip end surface of the connecting pin 36 is located below the upper surface of the auxiliary pin support portion 25. The cylindrical portion 37 is inserted into the connected portion 16 arranged between the pin support portion 23 and the auxiliary pin support portion 25 . The transport truck 15 is connected to the towing vehicle 11 via the connected portion 16, the connecting pin 36, and the truck connecting frame 21.

In the disconnected position, as shown by the two-dot chain line in FIG. 2, the portion of the cylindrical portion 37 below the stopper 39 is inserted only into the insertion hole 24 of the insertion hole 24 and the auxiliary insertion hole 26. A lower end surface 36a (tip surface) of the connecting pin 36 is located above the auxiliary pin support section 25. At the connection release position, the connection pin 36 can be pulled out from the connected portion 16 to release the connection.

As shown in FIGS. 3A and 3B, the top plate part 38 is provided at the upper end of the cylindrical part 37 and closes the upper end of the cylindrical part 37. The stopper 39 projects radially outward from the top plate portion 38 of the cylindrical portion 37 . The stopper 39 has a function of restricting downward movement of the connecting pin 36 by contacting the pin support portion 23 from above.

<Operating mechanism 51>
As shown in FIGS. 1 and 2, the operating mechanism 51 includes an operating lever 52 that is operable on the trolley connection frame 21, and a transmission mechanism 53 that transmits the force applied to the operating lever 52 to the connecting pin 36. It is equipped with

The operating lever 52 has an elongated shape, and is attached at one end thereof to the shaft portion 35 so as to be integrally rotatable therewith. When no force is applied to the operating lever 52, the operating lever 52 assumes a posture extending in the vertical direction. Further, the operating lever 52 can be rotated forward and downward about the shaft portion 35 by applying a forward force thereto.

The transmission mechanism 53 includes a wire 54, a fixed pulley 55, and a movable pulley 57. The front end portion, which is one end portion, of the wire 54 is attached to the shaft portion 35, and thereby indirectly attached to the operating lever 52 via the coaxial portion 35. On the other hand, the other end of the wire 54 is attached to the rear end of the horizontal frame section 32.

A portion of the wire 54, more specifically, a portion close to the front end portion, is arranged along the inside or outside of the lever support portion 33.
The fixed pulley 55 is rotatably supported by a shaft 56 with respect to the support column 34 .

The movable pulley 57 is rotatably connected to the connecting pin 36 via a rod 62 which will be described later. More precisely, movable pulley 57 is rotatably supported by shaft 58 with respect to rod 62 .

The wire 54 is wound around a fixed pulley 55 and a movable pulley 57.
The transport vehicle coupling device 10 further includes a retaining structure 61 shown in FIGS. 3(a) and 3(b).

<Keeping structure 61>
The retaining structure 61 has a function of holding the connecting pin 36 in the connecting position when the transport vehicle 15 is connected to the towing vehicle 11 and restricting movement of the connecting pin 36 from the connecting position to the uncoupling position. . The above-mentioned connecting pin 36 has a retaining structure 61. The retaining structure 61 includes a rod 62 and a switching member 63.

The rod 62 is inserted through the top plate portion 38 of the connecting pin 36 so as to be movable up and down. A protrusion 62 a that protrudes outward in the radial direction of the cylindrical portion 37 is formed at the lower end of the rod 62 located inside the connecting pin 36 .

The switching member 63 is rotatably supported by a support shaft 64 with respect to the connecting pin 36 . In the switching member 63, a bent portion 63b is formed above the support shaft 64. The bent portion 63b is bent at an obtuse angle with respect to a portion 63c of the switching member 63 below the support shaft 64. Expressed differently, when the portion 63c is in a vertical state (FIG. 3(b)), the bent portion 63b is inclined so that the upper side approaches the axis L1 of the cylindrical portion 37. Further, when the bent portion 63b is in a vertical state (FIG. 3(a)), the portion 63c is inclined so that the lower side approaches the axis L1 of the cylindrical portion 37.

An engaging claw portion 63d and an input portion 63e are formed in the portion 63c. The engagement claw portion 63d protrudes radially outward from the cylindrical portion 37 from the lower portion of the portion 63c. The input portion 63e projects inward in the radial direction of the cylindrical portion 37 from the upper portion of the portion 63c.

In the retaining structure 61, the protrusion 62a of the rod 62 has the following function.
- As the rod 62 rises, the protrusion 62a comes into contact with the top plate part 38 from below, thereby restricting its upward movement.

- The protrusion 62a contacts the bent portion 63b as the rod 62 rises, thereby rotating the switching member 63 to the side where the engaging claw portion 63d and the input portion 63e approach the axis L1.
- The protrusion 62a contacts the input part 63e from above as the rod 62 descends, thereby rotating the switching member 63 in a direction where the engagement claw part 63d and the input part 63e move away from the axis L1.

Next, the operation of the first embodiment configured as described above will be explained.
As shown in FIGS. 1 and 2, when the operating lever 52 is not operated, the operating lever 52 assumes a posture extending in the vertical direction. The conveyance cart 15 is positioned behind the towing vehicle 11, and the connected portion 16 is disposed between the pin support portion 23 and the auxiliary pin support portion 25.

As shown in FIG. 3(b), the protruding portion 62a of the rod 62 is located inside the connecting pin 36 and further away from the top plate portion 38 downward. No force acts on the connecting pin 36 from the rod 62 to raise the connecting pin 36.

As shown by a solid line in FIG. 2, a portion of the connecting pin 36 below the stopper 39 is inserted through both the insertion hole 24 and the auxiliary insertion hole 26, and is inserted into the connected portion 16. The conveyance truck 15 is connected to the towing vehicle 11 via the connected portion 16, the connecting pin 36, and the truck connecting frame 21.

Due to the weight of the connecting pin 36, the stopper 39 is in contact with the pin support portion 23 from above. This contact restricts downward movement of the connecting pin 36.
When the towing vehicle 11 moves forward, the connecting pin 36 moves forward together with the towing vehicle 11. Further, when the towing vehicle 11 is moved backward, the connecting pin 36 moves rearward together with the towing vehicle 11. The movement of the towing vehicle 11 is transmitted to the transport vehicle 15 via the connecting pin 36 and the connected portion 16. A transport vehicle 15 is towed by a towing vehicle 11.

Moreover, at this time, as shown in FIG. 3(b), the rod 62 is descending due to its own weight. The input portion 63e is pushed downward by the protrusion 62a of the rod 62. The switching member 63 rotates around the support shaft 64 in a direction where the engaging claw portion 63d moves away from the axis L1 of the cylinder portion 37. The engagement claw portion 63d protrudes radially outward from the cylinder portion 37 and engages with the peripheral portion of the insertion hole 24 in the pin support portion 23 from below. This engagement and the contact of the stopper 39 with the pin support portion 23 prevent the connecting pin 36 from moving in the vertical direction relative to the pin support portion 23 . In other words, the connecting pin 36 is held (locked) in the connected position.

The above state in which the engaging claw portion 63d engages with the pin support portion 23 continues as long as the input portion 63e is pressed by the protrusion 62a. To release the above-mentioned engaged state, the input part 63e is no longer pressed by the protrusion 62a, and the switching member 63 can be rotated, and the engaging claw part 63d must be pressed against the switching member 63. It is necessary that a force be applied to the connecting pin 36 to rotate it in the recessed direction. For this purpose, the operating lever 52 needs to be operated. Unless the operating lever 52 is operated, the connecting pin 36 will not move upward and will not come out of the connected portion 16. In other words, the connecting pin 36 is held in the connecting position, and the connecting pin 36 is prevented from coming off.

As shown in FIG. 2, when a force directed downward and forward is applied to the control lever 52, which is in a posture extending in the vertical direction, the control lever 52 is rotated downward and forward about the shaft portion 35. . Along with this rotation, a force directed forward is applied to the front end of the wire 54. The force applied to the wire 54 is transmitted to the connecting pin 36 via the fixed pulley 55, movable pulley 57, and rod 62.

The direction of the force applied to the operating lever 52 is changed by a fixed pulley 55. A force acts on the rod 62 to pull it up. When the rod 62 is raised by the above force as shown in FIG. 3(a), the protrusion 62a is separated upward from the input part 63e. Subsequently, the bent portion 63b is pushed outward in the radial direction of the cylindrical portion 37 by the protrusion 62a, and the switching member 63 is rotated to the side where the engaging claw portion 63d approaches the axis L1 of the cylindrical portion 37. The engaging claw portion 63d sinks into the cylindrical portion 37 and no longer engages with the peripheral portion of the insertion hole 24 in the pin support portion 23, and the above-mentioned holding (locking) of the connecting pin 36 is released. Further, when the operating lever 52 is rotated forward and downward to raise the rod 62, the connecting pin 36 comes out of the auxiliary insertion hole 26 of the auxiliary pin support portion 25. The protruding portion 62a contacts the top plate portion 38 from below, and the connecting pin 36 is pulled up. When the connecting pin 36 is moved to the disconnecting position as shown by the two-dot chain line in FIG. located between. When the connecting pin 36 is removed from the connected portion 16, the connection of the transport vehicle 15 to the towing vehicle 11 is released.

When the above force is no longer applied to the operating lever 52, no forward force is applied to the front end of the wire 54. On the other hand, the rod 62 tries to descend due to its own weight. As the rod 62 descends, the wire 54 is pulled. The operating lever 52 rotates about the shaft portion 35 in a direction opposite to that at the time of the above-mentioned operation, and returns to a posture extending in the vertical direction.

Next, the effects of the first embodiment will be explained.
(1-1) In the first embodiment, the movement of the operating lever 52 is transmitted to the connecting pin 36 via the wire 54, the fixed pulley 55, the movable pulley 57, and the rod 62. Therefore, by rotating the operating lever 52 around the shaft portion 35 supported by the lever support portion 33, the connection pin 36 can be moved between the connection position and the connection release position.

(1-2) In the first embodiment, when the transport vehicle 15 is connected to the towing vehicle 11, as shown in FIG. 3(b), the switching member is 63 is rotated. This rotation causes the engaging claw portion 63d to protrude from the cylindrical portion 37 and engage with the peripheral portion of the insertion hole 24 in the pin support portion 23. Therefore, the connecting pin 36 can be held in the connecting position. It is possible to prevent the connecting pin 36 from moving from the connecting position to the disconnecting position and slipping out of the connected portion 16, that is, to prevent it from coming off.

(1-3) By applying a force to rotate the operating lever 52 in the vertically extending position forward and downward, the above-mentioned retainer can be released. That is, by raising the rod 62 and pressing the bent part 63b with the protrusion 62a, the switching member 63 can be rotated and the engaging claw part 63d can be retracted into the cylinder part 37. The above-mentioned locking of the connecting pin 36 can be released, and the connecting pin 36 can be made vertically movable.

(1-4) In the first embodiment, as explained in (1-1) above, the operation mechanism 51 (operation lever 52, wire 54, This is realized by a fixed pulley 55 and a movable pulley 57).

Furthermore, as explained in (1-2) and (1-3) above, the retaining structure 61 (rod 62 and switching member 63) of the connecting pin 36 realizes the prevention and release of the connecting pin 36. are doing.

Therefore, according to the first embodiment, it is possible to move the connecting pin 36 and prevent it from coming off with fewer parts and a simpler structure than in the case of electric operation (Patent Document 2). Furthermore, it is possible to provide the transport vehicle coupling device 10 that is low cost, highly durable, and easy to maintain.

(1-5) In the first embodiment, the coupling pin 36 can be moved between the coupling position and the coupling release position only by applying or not applying force to the operating lever 52. .

Particularly, in the first embodiment, the driver of the towing vehicle 11, while seated in the driver's seat 12, connects the connecting pin 36 at a location remote from the driver's seat 12 by operating the operating lever 52. and an uncoupled position. In other words, the connecting pin 36 can be remotely controlled, providing good switching operability.

(1-6) Furthermore, in the first embodiment, the connecting pin 36 is lowered by its own weight to the connecting position, and the rod 62, which is lowered by its own weight, rotates the switching member 63 to connect the engaging claw portion 63d to the insertion hole 24. It is engaged with the peripheral part of. Therefore, there is no need to separately provide a power source for lowering the connecting pin 36 or rotating the switching member 63. This point is also effective in simplifying the structure of the transport vehicle coupling device 10.

(1-7) In the first embodiment, the transmission mechanism 53 is composed of a wire 54 and a pulley. Furthermore, a movable pulley 57 is used as the pulley. Therefore, the operating lever 52 can be operated with a small force, and operability is improved in this respect as well.

Next, the transport vehicle coupling devices in the second to fourth embodiments will be explained with reference to FIGS. 4 to 13.
Note that in the second to fourth embodiments, the same components as in the first embodiment are given the same reference numerals. Furthermore, in the second to fourth embodiments, components corresponding to those in the first embodiment will be described with reference numerals incremented by "100", "200", and "300", respectively.

[Second embodiment]
Next, the transport vehicle coupling device 110 in the second embodiment will be explained with reference to FIGS. 4 to 7.

<Bogie connection frame 121>
As shown in FIGS. 4 and 5, in the second embodiment, the lever support part 133 of the truck connection frame 121 is located on the vertical frame part 131 fixed to the front end of the pin support part 123. The lever support part 133 is formed by a bottom plate 133a fixed to the upper end of the vertical frame part 131 and extending in the front-rear direction, and a pair of side plates 133b bent upward on both left and right sides of the bottom plate 133a. It has a channel shape. The operating lever 152 as a whole has an elongated shape in the front-rear direction.

<Connecting pin 136>
As shown in FIGS. 4, 6, and 7, the connecting pin 136 has a vertically elongated shaft shape. A lower end surface 136a of the connecting pin 136 constitutes a tip end surface of the connecting pin 136. In the connecting pin 136, at least the lower portion having the lower end surface 136a is formed to have a smaller diameter than the insertion hole 124 of the pin support part 123 and the auxiliary insertion hole 126 of the auxiliary pin support part 125.

Similar to the first embodiment, the connecting pin 136 can reciprocate between a connecting position and a disconnecting position set higher than the connecting position.
In the connecting position, the lower portion of the connecting pin 136 is inserted into both the insertion hole 124 and the auxiliary insertion hole 126, as shown by the two-dot chain line in FIG. A lower end surface 136a (tip surface) of the connecting pin 136 is located below the upper surface of the auxiliary pin support portion 125. The lower part of the connecting pin 136 is inserted into the connected part 16 arranged between the pin support part 123 and the auxiliary pin support part 125, so that the connected part 16 is connected to the connecting pin 136.

As shown by the solid line in FIG. 6, in the connection release position, the lower portion of the connecting pin 136 is inserted only into the insertion hole 124 of the insertion hole 124 and the auxiliary insertion hole 126. A lower end surface 136a of the connecting pin 136 is located above the auxiliary pin support portion 125. At the connection release position, the connection can be released by removing the connection pin 136 from the connected portion 16.

Note that a stopper 139 is formed at the lower part of the connecting pin 136 so as to come into contact with the pin support portion 123 from above at the connecting position. The stopper 139 has a function of restricting movement of the connecting pin 136 below the connecting position.

<Operating mechanism 151>
As shown in FIGS. 4 and 5, the operating lever 152 of the operating mechanism 151 is bent downward at an intermediate portion in the front-rear direction, so that the entire operating lever 152 has an inverted shape. The middle part and the regions before and after the operating lever 152 are arranged between the both side plates 133b of the lever support part 133, and are rotatable in the vertical direction by a shaft 153 spanned between the both side plates 133b. Supported.

As shown in FIGS. 4 and 7, the rear end of the operating lever 152 is connected to the upper end of the connecting pin 136 by a shaft 154 so that power can be transmitted.
The operating lever 152 has two positions: a first position in which the connecting pin 136 is placed in the connected position, as shown by the two-dot chain line in FIG. It can be rotated between two positions.

<Keeping structure 161>
As shown in FIG. 5, the retaining structure 161 holds the connecting pin 136 in the connecting position when the transport vehicle 15 is connected to the towing vehicle 11, and prevents the connecting pin 136 from moving from the connecting position to the uncoupling position. It has a regulatory function. The lever support portion 133 in the trolley connection frame 121 and the operating lever 152 in the operating mechanism 151 have a retaining structure 161.

The retaining structure 161 includes a turnover spring 162 instead of the rod 62 and switching member 63 in the first embodiment. In the second embodiment, a tension coil spring is used as the turnover spring 162. The turnover spring 162 has a function of reversing the direction in which the operating lever 152 is biased at an intermediate position between the first position and the second position. Note that in FIG. 4, illustration of the turnover spring 162 is omitted.

The turnover spring 162 is spanned between the lever support portion 133 and the operating lever 152 so as to bias the operating lever 152 in the following manner.
- When the operating lever 152 is located between the first position and the intermediate position, the operating lever 152 is urged toward the first position.

- When the operating lever 152 is located between the second position and the intermediate position, the operating lever 152 is biased toward the second position.
Next, the operation of the second embodiment will be explained.

As shown by the two-dot chain line in each of FIGS. 5 and 6, when the operating lever 152 is located at the first position, the connecting pin 136 is located at the connecting position, and the pin support portion 123 and the auxiliary pin support portion 125 It is inserted into the connected portion 16 disposed between the two.

The conveyance truck 15 is connected to the towing vehicle 11 via the connected portion 16, the connecting pin 136, and the truck connecting frame 121. Therefore, when the towing vehicle 11 is moved forward or backward, the truck connecting frame 121 and the connecting pin 136 move forward or backward together with the towing vehicle 11. The movement of the towing vehicle 11 is transmitted to the transport vehicle 15 via the vehicle connection frame 121 , the connection pin 136 , and the connected portion 16 . A transport vehicle 15 is towed by a towing vehicle 11.

At this time, the operating lever 152 is urged by the turnover spring 162 toward the first position that positions the connecting pin 136 at the connecting position. Therefore, the connecting pin 136 is held in the connecting position. The phenomenon in which the connecting pin 136 moves upward and slips out of the connected portion 16 is restricted.

As shown by solid lines in each of FIGS. 5 and 6, when the operating lever 152 is located at the second position, the connecting pin 136 is located at the disconnecting position. By removing the connecting pin 136 from the connected portion 16, the connection is released.

At this time, the operating lever 152 is urged by the turnover spring 162 toward the second position, which positions the connecting pin 136 at the disconnected position. The connecting pin 136 is maintained in a state where it is removed from the connected portion 16.

When rotating the operating lever 152 located at the first position toward the second position, between the first position and the intermediate position, there is a turn that urges the operating lever 152 toward the first position. The operating lever 152 is rotated against the biasing force of the overspring 162. When the operating lever 152 exceeds the intermediate position, the direction in which the turnover spring 162 biases the operating lever 152 is reversed. The biasing force of the turnover spring 162 that biases the operating lever 152 toward the second position comes to act on the operating lever 152. Therefore, the operating lever 152 rotates to the second position.

When rotating the operating lever 152 located at the second position toward the first position, between the second position and the intermediate position, there is a turn that urges the operating lever 152 toward the second position. The operating lever 152 is rotated against the biasing force of the overspring 162. When the operating lever 152 exceeds the intermediate position, the direction in which the turnover spring 162 biases the operating lever 152 is reversed. The biasing force of the turnover spring 162 that biases the operating lever 152 toward the first position comes to act on the operating lever 152 . Therefore, the operating lever 152 rotates to the first position.

Next, the effects of the second embodiment will be explained.
(2-1) In the second embodiment, as shown in FIGS. 4 and 7, the movement of the operating lever 152 is transmitted to the connecting pin 136 via the shaft 154. Therefore, by rotating the operating lever 152 supported by the lever support part 133 between the first position and the second position, the connecting pin 136 can be moved between the connecting position and the disconnecting position. can.

(2-2) In the second embodiment, as shown in FIG. 5, a turnover spring 162 is provided as a retaining structure 161 between the lever support portion 133 and the operating lever 152. Therefore, when the operating lever 152 is located at the first position and the transport vehicle 15 is connected to the towing vehicle 11, the operating lever 152 can be biased toward the first position by the turnover spring 162. When the transport vehicle 15 is connected to the towing vehicle 11, the connecting pin 136 can be prevented from moving from the connecting position to the uncoupling position and coming out of the connected portion 16, that is, can be prevented from coming off.

(2-3) Furthermore, by rotating the portion of the operation lever 152 in the first position in front of the shaft 153 downward, the prevention of the rotation spring 162 from coming off can be released. That is, when the operating lever 152 is rotated beyond the intermediate position, the direction in which the operating lever 152 is biased is reversed from the first position to the second position. By reversing the biasing direction, the above-mentioned locking of the connecting pin 136 can be released and the connecting pin 136 can be moved to the disconnecting position.

(2-4) In the second embodiment, as described in (2-1) above, the operation mechanism 151 realizes the movement of the connecting pin 136 between the connecting position and the disconnecting position.
Further, as explained in (2-2) and (2-3) above, the retaining structure 161 (turnover spring 162) of the bogie connecting frame 121 and the operating mechanism 151 prevents the connecting pin 136 from coming off and releases it. ) is realized.

Therefore, according to the second embodiment, it is possible to move the connecting pin 136 and prevent it from coming off with fewer parts and a simpler structure than in the case of electric operation (Patent Document 2). Furthermore, it is possible to provide the transport vehicle coupling device 110 that is low cost, highly durable, and easy to maintain.

(2-5) In the second embodiment, similarly to the first embodiment, the connection pin 136 can be moved between the connection position and the connection release position by applying or not applying force to the operation lever 52. It is possible to move between the two, and the switching operability is good.

[Third embodiment]
Next, a transport vehicle coupling device 210 in a third embodiment will be described with reference to FIG. 8.

The third embodiment has the following points in common with the second embodiment.
- The trolley connection frame 221 includes a pin support portion 223 having an insertion hole 224.

- The trolley connection frame 221 is provided with an auxiliary pin support part 225 having an auxiliary insertion hole 226 below the pin support part 223.
- The connecting pin 236 is inserted through the insertion hole 224 and the auxiliary insertion hole 226 so that it can move up and down.

- The operating lever 252 is rotatable between a first position in which the connecting pin 236 is located in the connected position and a second position in which the connecting pin 236 is located in the disconnected position.
- The front part of the operating lever 252 in the first position is moved to the second position by rotating downward.

- The operating mechanism 251 includes an operating lever 252 and a transmission mechanism 253, and the operating lever 252 is connected to the connecting pin 236 by the transmission mechanism 253 so that power can be transmitted.
The third embodiment differs from the second embodiment in that the connecting pin 236 has a retaining structure 261.

<Keeping structure 261>
A front inclined portion 243 and a rear inclined portion 244 are formed on the connecting pin 236 as a retaining structure 261 . The front inclined portion 243 and the rear inclined portion 244 are adjacent to the lower side of the connecting pin 236 located at the connecting position, which is the side closer to the lower end surface 236a (tip surface) of the connecting pin 236 with respect to the connected portion 16. It is formed in places.

In the third embodiment, the connecting pin 236 has a cylindrical shape as a whole and extends in the vertical direction. A lower portion of the connecting pin 236 including the lower end surface 236a is located below the pin support portion 223 in the connecting position.

A stopper 239 is formed at the lower part of the connecting pin 236 and contacts the pin support portion 223 from above at the connecting position. A portion of the lower portion of the connecting pin 236 that is adjacent to the stopper 239 on the lower side and is inserted into the insertion hole 224 of the pin support portion 223 at the connecting position, and a portion surrounding the portion have an upper large diameter. 237. The upper large diameter portion 237 has a cylindrical shape with a smaller diameter than the insertion hole 224 . A portion of the lower portion of the connecting pin 236 that is inserted into the auxiliary insertion hole 226 of the auxiliary pin support portion 225 at the connecting position and a portion surrounding the portion are constituted by a lower large diameter portion 238 . The lower large diameter portion 238 has a cylindrical shape with a diameter smaller than that of the auxiliary insertion hole 226.

A small diameter portion 241 and a tapered portion 242 are formed at the lower part of the connecting pin 236 and between the upper large diameter portion 237 and the lower large diameter portion 238 . The small diameter portion 241 is formed to have a smaller diameter than the upper large diameter portion 237 at a location adjacent to the lower side of the upper large diameter portion 237 . The tapered portion 242 is formed between the lower large diameter portion 238 and the small diameter portion 241 in a tapered shape whose diameter increases toward the bottom.

The front inclined portion 243 is formed by a portion of the tapered portion 242 that is more forward than the small diameter portion 241 . The rear inclined portion 244 is formed by a portion of the tapered portion 242 that is rearward of the small diameter portion 241 .

The tapered portion 242 including the front inclined portion 243 and the rear inclined portion 244 is adjacent to the lower side of the connecting pin 236 located at the connecting position, which is the side closer to the lower end surface 236a (tip surface) with respect to the connected portion 16. It is formed in the place where

The front inclined portion 243 is inclined so as to be positioned further forward as it approaches the lower end surface 236a (the lower in FIG. 8). The rear inclined portion 244 is inclined so as to be positioned toward the rear as it approaches the lower end surface 236a.

Next, the operation of the third embodiment will be explained.
When the operating lever 252 is located at the first position, the connecting pin 236 is located at the connecting position, as shown by the solid line in FIG. The connected portion 16 is arranged between the pin support portion 223 and the auxiliary pin support portion 225. The connecting pin 236 is inserted into the connected portion 16 at the small diameter portion 241 and the tapered portion 242 .

The transport truck 15 is connected to the towing vehicle 11 via the connected portion 16, the connecting pin 236, and the truck connecting frame 221. Therefore, when the towing vehicle 11 is moved forward or backward, the connecting pin 236 moves forward or backward together with the towing vehicle 11. The movement of the towing vehicle 11 is transmitted to the transport vehicle 15 via the connecting pin 236 and the connected portion 16. A transport vehicle 15 is towed by a towing vehicle 11.

In particular, in the third embodiment, when the towing vehicle 11 moves forward with the connecting pin 236 located at the connecting position, the front part of the inner circumferential surface of the connected portion 16 moves forward in the connecting position, as shown by the solid line in FIG. It contacts the front inclined portion 243 of the pin 236. The front inclined portion 243 is inclined so as to be located forward as it approaches the lower end surface 236a. Therefore, the phenomenon in which the connecting pin 236 is pushed toward the lower end surface 236a side (lower side) due to contact with the front inclined portion 243 of the connected portion 16, and the connecting pin 236 moves upward and slips out from the connected portion 16 is restricted. Ru.

Furthermore, when the towing vehicle 11 moves backward with the connecting pin 236 located at the connecting position, the rear part of the inner circumferential surface of the connected portion 16 tilts backwards of the connecting pin 236, as shown by the two-dot chain line in FIG. 244. The rear inclined portion 244 is inclined so as to be positioned toward the rear as it approaches the lower end surface 236a. Therefore, the connecting pin 236 is pushed toward the lower end surface 236a side (lower side) due to contact with the rear inclined portion 244 of the connected portion 16, and a phenomenon in which the connecting pin 236 slips out from the connected portion 16 is restricted.

Furthermore, when the brake is applied to the towing vehicle 11 moving forward while the connecting pin 236 is in the connecting position, the connecting pin 236 stops moving forward, whereas the connected portion 16 is moved due to inertia. Move forward. Similarly to when the towing vehicle 11 retreats, the rear portion of the inner circumferential surface of the connected portion 16 comes into contact with the rear inclined portion 244 of the connecting pin 236. Therefore, the connecting pin 236 is pushed toward the lower end surface 236a side (lower side) at the rear inclined portion 244, as in the case of retreating. This prevents the connecting pin 236 from slipping out of the connected portion 16.

By the way, when the operating lever 252 located at the first position is rotated toward the second position, the rotation is transmitted to the connecting pin 236 via the transmission mechanism 253. A force is applied to the connecting pin 236 located in the connected position toward the disconnected position. Then, the front inclined part 243 pushes the coupled part 16 forward, or the rear inclined part 244 pushes the coupled part 16 backward, moving upward to the coupling release position side. If the operating lever 252 continues to be rotated and the connecting pin 236 continues to rise even after the front inclined portion 243 and the rear inclined portion 244 have passed the connected portion 16, the connecting pin 236 will move as indicated by the two-dot chain line in FIG. Move to the uncoupling position as shown. By removing the connecting pin 236 from the connected portion 16, the connection of the transport vehicle 15 to the towing vehicle 11 is released.

Next, the effects of the third embodiment will be explained.
(3-1) In the third embodiment, the movement of the operating lever 252 is transmitted to the connecting pin 236 by the transmission mechanism 253. Therefore, similarly to (2-1) above, by rotating the operating lever 252 between the first position and the second position, the connecting pin 236 can be moved between the connecting position and the disconnecting position. I can do it.

(3-2) In the third embodiment, the front inclined portion 243 or the rear inclined portion 244 is pressed downward by the connected portion 16. Therefore, when the transport vehicle 15 is connected to the towing vehicle 11, the connecting pin 236 can be prevented from moving from the connecting position to the uncoupling position and coming out of the connected portion 16, that is, can be prevented from coming off.

(3-3) Furthermore, by continuing to rotate the operating lever 252 even after the front inclined portion 243 or the rear inclined portion 244 has passed the connected portion 16, the connecting pin 236 can be moved to the uncoupled position. .

(3-4) In the third embodiment, as described in (3-1) above, the operation mechanism 251 realizes movement of the connecting pin 236 between the connecting position and the disconnecting position.
In addition, as explained in (3-2) and (3-3) above, the retaining structure 261 (the front inclined portion 243 and the rear inclined portion 244).

Therefore, according to the third embodiment, it is possible to move the connecting pin 236 and prevent it from coming off with fewer parts and a simpler structure than in the case of electric operation (Patent Document 2). Furthermore, it is possible to provide the transport vehicle coupling device 210 that is low cost, highly durable, and easy to maintain.

(3-5) In the third embodiment, similarly to the above (1-5) of the first embodiment, the connecting pin 236 can be moved by applying or not applying force to the operating lever 52. It can be moved between the connected position and the uncoupled position, providing good switching operability.

[Fourth embodiment]
Next, the transport vehicle coupling device 310 in the fourth embodiment will be explained with reference to FIGS. 9 to 13.

In the fourth embodiment, the truck connecting frame 321, the connecting pin 336, the operating mechanism 351, and the retaining structure 361 have different configurations from those in the first to third embodiments.

<Bogie connection frame 321>
As shown in FIGS. 9 and 10, the bogie connection frame 321 includes a vehicle frame section 22 and a movable frame section 376.

The skeleton portion of the vehicle frame portion 22 is constituted by an elongated horizontal frame portion 371 extending in the left-right direction. The vehicle frame portion 22 is fixed to the rear portion of the towing vehicle 11 at the horizontal frame portion 371.

The movable frame section 376 includes a pair of inclined frame sections 377 and a connecting frame section 379. The both inclined frame parts 377 and the connecting frame part 379 are each made of an elongated bar or pipe material. Both inclined frame parts 377 are arranged in an inclined state with respect to the front-rear direction so that the distance between them becomes narrower toward the rear. The rear end portions of both inclined frame portions 377 are connected in a state in which they are brought into contact with each other. The connecting frame portion 379 is arranged at an intermediate portion of the movable frame portion 376 in the front-rear direction. The connecting frame portion 379 is arranged between both inclined frame portions 377 in the left-right direction. The connecting frame portion 379 extends in the left-right direction and spans both inclined frame portions 377.

The movable frame portion 376 is supported at the front end portions of both inclined frame portions 377 so as to be rotatable in the vertical direction with respect to the vehicle frame portion 22 .
For this support, a rotation shaft 378 is fixed to the front end of each inclined frame portion 377. The left rotation shaft 378 projects leftward from the front end of the left inclined frame portion 377. The right rotation shaft 378 protrudes rightward from the front end of the right inclined frame portion 377.

Further, for the above-mentioned support, the vehicle frame section 22 further includes a pair of bearing sections 372 arranged at both left and right ends of the horizontal frame section 371. Each bearing portion 372 has a plate shape that is elongated in the front-rear direction. Each bearing portion 372 is fixed to the left and right ends of the horizontal frame portion 371 at its front portion. The rear part of each bearing part 372 is located further back than the horizontal frame part 371. A bearing hole 373 is formed in the rear portion of each bearing portion 372 .

As shown in FIGS. 10 and 13, each bearing hole 373 has a rotation hole portion 374 that rotatably supports a rotation shaft 378. As shown in FIGS. The rotation hole portion 374 of each bearing hole 373 is constituted by a round hole having a diameter that allows the rotation shaft 378 to rotate.

<Connecting pin 336>
As shown in FIGS. 9 and 11, the connecting pin 336 is integrally formed with the movable frame portion 376. The connecting pin 336 includes a main body pin portion 337 that extends in the vertical direction. The main body pin part 337 is fixed at its upper end to a rear end where both inclined frame parts 377 join.

<Operation mechanism 351>
As shown in FIGS. 9 and 10, the operating mechanism 351 includes an operating lever 352 fixed to the movable frame portion 376. The operating lever 352 includes an operating section 352a extending in the front-rear direction and a transmitting section 352b extending in the up-down direction. The transmission section 352b has its upper end fixed to the rear end of the operating section 352a. A lower end portion of the transmission portion 352b is fixed to the connection frame portion 379.

The operating lever 352 is rotatable in a rotation range between a first position in which the connecting pin 336 is located in the connected position and a second position in which the connecting pin 336 is located in the disconnected position. The operating lever 352 in the first position is moved to the second position by operating the operating portion 352a downward.

The movable frame portion 376 has a function of transmitting the force applied to the operating lever 352 to the connecting pin 336.
The transport vehicle coupling device 310 further includes a retaining structure 361.

<Keeping structure 361>
As shown in FIG. 12, the retaining structure 361 includes a slide hole portion 375 that forms a part of a bearing hole 373, a rotation shaft 378, and a part of a connecting pin 336 as shown in FIG. A bent pin portion 338 is provided.

As shown in FIGS. 12 and 13, the slide hole 375 of each bearing hole 373 extends rearward from the rotation hole 374. As shown in FIGS.
Each rotation shaft 378 is formed in a shape that satisfies the following conditions.

- It has a shape that slides in the slide hole 375 with rotation restricted.
- The connecting pin 336 has a shape that can be fitted into the slide hole 375 when the connecting pin 336 is located at the connecting position.

As a shape that satisfies the above conditions, each rotation shaft 378 is formed in a rectangular parallelepiped shape that is longer in the front-rear direction than in the other direction.
As shown in FIGS. 9 and 11, the lower end surface 336a of the connecting pin 336 constitutes the tip surface of the connecting pin 336. The bent pin portion 338 is formed at a lower portion of the connecting pin 336 that includes the lower end surface 336a. The bent pin portion 338 is inclined so that it is located toward the rear as it approaches the lower end surface 336a (distal end surface), that is, the lower the bending pin portion 338 is. The upper end of the bent pin portion 338 is connected to the lower end of the main body pin portion 337.

Next, the operation of the fourth embodiment will be explained.
When no force is applied to the operating lever 352, the operating lever 352 is located in the first position. The operating portion 352a of the operating lever 352 is in a substantially horizontal state. At this time, as shown by the solid line in FIG. 11, the connecting pin 336 is located at the connecting position and inserted into the connected portion 16.

The transport vehicle 15 is connected to the towing vehicle 11. Therefore, when the towing vehicle 11 is moved forward, the truck connecting frame 321, the operating mechanism 351, and the connecting pin 336 move forward together with the towing vehicle 11. The movement of the towing vehicle 11 is transmitted to the transport vehicle 15 via the vehicle connection frame 321, the connection pin 336, and the connected portion 16. A transport vehicle 15 is towed by a towing vehicle 11.

Further, when the towing vehicle 11 moves forward, the rotation shaft 378 is fitted into the slide hole portion 375 of the bearing hole 373, as shown in FIG. This fitting restricts the rotation of the movable frame portion 376 about the rotation shaft 378. The operation of the operating lever 352 for moving the connecting pin 336 from the connecting position to the disconnecting position is restricted. The operating lever 352 is held at the first position. The phenomenon in which the connecting pin 336 moves upward and slips out of the connected portion 16 is restricted.

Furthermore, when the brake is applied to the towing vehicle 11 that is moving forward while the connecting pin 336 is in the connected position, the connecting pin 336 stops moving forward, while the connected portion 16 moves forward due to inertia. do. As shown by the solid line in FIG. 11, the rear portion of the inner circumferential surface of the connected portion 16 contacts the bent pin portion 338 of the connecting pin 336. The bent pin portion 338 is inclined so as to be positioned toward the rear as it approaches the lower end surface 336a. Therefore, the connecting pin 336 is pushed downward at the bent pin portion 338 toward the lower end surface 336a. This prevents the connecting pin 336 from slipping out of the connected portion 16.

Further, when the towing vehicle 11 moves backward with the connecting pin 336 located at the connecting position, the vehicle frame portion 22 moves rearward while the connected portion 16 and the movable frame portion 376 remain stationary. Therefore, as shown in FIG. 13, the rotation shaft 378 comes out of the slide hole 375. When the towing vehicle 11 is stopped with the rotation shaft 378 located in the rotation hole 374, the movable frame portion 376 can be rotated relative to the vehicle frame portion 22 about the rotation shaft 378. Become.

When a downward force is applied to the operating portion 352a of the operating lever 352, the force is transmitted to the movable frame portion 376 via the transmitting portion 352b. The movable frame portion 376 rotates upward about a rotation shaft 378 at the front end of each inclined frame portion 377 . With this rotation, the connecting pin 336 formed integrally with the movable frame portion 376 moves upward from the connecting position. During this movement, when the connecting pin 336 comes out of the connected portion 16 and moves to the disconnection position, the connection of the transport vehicle 15 to the towing vehicle 11 is released.

Note that when the downward force is no longer applied to the operating lever 352 located at the second position, the movable frame portion 376 rotates downward about both rotation shafts 378 due to its own weight. With this rotation, the connection pin 336 moves downward from the connection release position. If the connecting pin 336 is inserted into the connected portion 16 when moving to the connecting position, it is possible to connect the transport vehicle 15 to the towing vehicle 11.

Next, the effects of the fourth embodiment will be explained.
(4-1) In the fourth embodiment, the movement of the operating lever 352 is transmitted to the connecting pin 336 via the movable frame portion 376. Therefore, by operating the operating lever 352, the movable frame portion 376 can be rotated in the vertical direction about the rotation shaft 378, and the coupling pin 336 can be moved between the coupling position and the coupling release position.

(4-2) In the fourth embodiment, a slide hole portion 375 is added to the bearing hole 373, and the rotation shaft 378 is formed into a rectangular parallelepiped shape. Therefore, by fitting the rotation shaft 378 into the slide hole 375 in the bearing hole 373, rotation of the movable frame portion 376 about the rotation shaft 378 can be restricted.

When the towing vehicle 11 to which the transport cart 15 is connected moves forward, the connecting pin 336 located at the connecting position and inserted into the connected part 16 moves from the connecting position to the uncoupling position and comes out of the connected part 16. In other words, it can be prevented from coming off.

(4-3) Furthermore, in the fourth embodiment, a bent pin portion 338 is formed on the connecting pin 336. Therefore, when the brake is applied during the forward movement of the towing vehicle 11, the bent pin portion 338 is pushed downward by the connected portion 16, and the connecting pin 336 can be prevented from slipping out from the connected portion 16.

(4-4) Note that by moving the towing vehicle 11 backward and moving the rotation shaft 378 from the slide hole 375 to the bearing hole 373, the above-mentioned retainer is released and the movable frame portion 376 can be rotated. It can be done.

(4-5) In the state of (4-4) above, operate the operating lever 352 and rotate the movable frame portion 376 upward to remove the connecting pin 336 from the connected portion 16 and release the connection. can be moved to position.

(4-6) In the fourth embodiment, as explained in (4-1) above, the movement of the connecting pin 336 between the connecting position and the uncoupling position is realized by the trolley connecting frame 321 and the operating mechanism 351. are doing.

Further, as explained in (4-2) to (4-5) above, the locking structure 361 (slide hole 375, a rotation shaft 378, and a bent pin portion 338).

Therefore, according to the fourth embodiment, it is possible to move the connecting pin 336 and prevent it from coming off with fewer parts and a simpler structure than in the case of electrical operation (Patent Document 2). Furthermore, it is possible to provide a transport vehicle coupling device 310 that is low cost, highly durable, and easy to maintain.

(4-7) In the fourth embodiment, the coupling pin 336 can be moved between the coupling position and the coupling release position by moving the towing vehicle 11 forward and backward and operating the operating lever 352, and switching The operability is good.

Note that the above embodiment can also be implemented as a modified example in which the above embodiment is modified as follows. The above embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range.

<About the first embodiment>
- The number of fixed pulleys 55 and movable pulleys 57 may be changed to a number different from that in the first embodiment.
- The attachment position of the wire 54 to the trolley connection frame 21 may be changed to a different location from that in the first embodiment.

<About the second embodiment>
- A different type of spring than a tension coil spring may be used as the turnover spring 162 in the second embodiment. FIG. 14 shows a modification in which a torsion coil spring is used as the turnover spring 162. In this case as well, the turnover spring 162 is bridged between the lever support portion 133 and the operating lever 152, as in the second embodiment. In this modification, as in the second embodiment, it is possible to obtain the effect of preventing the connecting pin 136 located at the connecting position from moving toward the disconnecting position.

<About the third embodiment>
- In the third embodiment, a tapered part 242 is formed over the entire circumference of the connecting pin 236, the front part thereof is a front slope part 243, and the rear part is a rear slope part 244. Alternatively, the front inclined part 243 may be formed only at the front part of the connecting pin 236, and the rear inclined part 244 may be formed only at the rear part. In this case as well, the same effects as in the third embodiment can be obtained.

<About the fourth embodiment>
- Provided that the rotation shaft 378 can rotate with respect to the rotation hole 374, even if the shape and size of the rotation hole 374 are changed to a shape and size different from those in the fourth embodiment. good.

- The transmission portion 352b of the operating lever 352 may be configured by a combination of the wire 54, the fixed pulley 55, and the movable pulley 57 as in the first embodiment.
- The retaining structure 61 in the first embodiment may be employed as the retaining structure 361 in the fourth embodiment.

- The retaining structure 261 in the third embodiment may be employed as the retaining structure 361 in the fourth embodiment.
<About the first to fourth embodiments>
- The connected portion 16 may be formed in a non-annular shape, provided that the connecting pins 36, 136, 236, and 336 have a shape that allows insertion and removal.

<About the first to third embodiments>
- The auxiliary pin support parts 25, 125, 225 may be omitted from the bogie connection frames 21, 121, 221.

<About the second and third embodiments>
- The connecting pins 136, 236 may be inserted into the pin supports 123, 223 so as to be movable in a direction different from the vertical direction, for example, in the horizontal direction.

DESCRIPTION OF SYMBOLS 10, 110, 210, 310... Transport vehicle coupling device 11... Traction vehicle 15... Transport vehicle 16... Connected section 21, 121, 221, 321... Dolly connection frame 22... Vehicle frame section 23, 123, 223... Pin support section 24, 124, 224... Insertion hole 33, 133... Lever support part 36, 136, 236, 336... Connection pin 36a, 136a, 236a, 336a... Lower end surface (tip surface)
51,151,251,351...Operating mechanism 52,152,252,352...Operating lever 53,253...Transmission mechanism 54...Wire 55...Fixed pulley 57...Moving pulley 61,161,261,361...Keeping structure 62... Rod 63... Switching member 63d... Engaging claw part 64... Support shaft 153... Shaft 162... Turnover spring 243... Front inclined part 244... Rear inclined part 373... Bearing hole 374... Rotation hole part 375... Slide hole part 376... Movable frame part 378...Rotation axis 338...Bending pin part

Claims (7)

A transport vehicle coupling device that connects a transport vehicle provided with a connected portion to a towing vehicle and releases the connection,
a bogie connection frame attached to the towing vehicle;
an operating mechanism that is operable on the trolley connection frame;
a connecting position provided on the truck connecting frame and inserted into the connected portion by at least the operating mechanism of the truck connecting frame and the operating mechanism, and connecting the transport truck to the towing vehicle; a connecting pin that can be moved between disconnection positions for pulling out from the section and releasing the connection;
At least one of the truck connecting frame, the operating mechanism, and the connecting pin holds the connecting pin in the connecting position when the transport truck is connected to the towing vehicle, and the connecting pin moves from the connecting position to the connecting pin. A transport vehicle coupling device that has a locking structure that prevents it from moving to the release position. The operation mechanism includes an operation lever that is operable on the trolley connection frame, and a transmission mechanism that transmits the force applied to the operation lever to the connection pin,
The transmission mechanism includes a wire, a fixed pulley, and a movable pulley,
One end of the wire is attached to the operating lever, and the other end is attached to the trolley connection frame,
The fixed pulley is rotatably supported by the trolley connection frame,
The movable pulley is rotatably supported by the connecting pin,
2. The transport vehicle coupling device according to claim 1, wherein the wire is wound around the fixed pulley and the movable pulley. The bogie connection frame includes a vehicle frame portion fixed to the rear portion of the towing vehicle, and a movable frame portion rotatably supported with respect to the vehicle frame portion by a rotation shaft provided at its front end. Equipped with
The operating mechanism includes an operating lever fixed to the movable frame portion,
2. The transport vehicle coupling device according to claim 1, wherein the coupling pin is integrally formed with the movable frame portion. The truck connection frame includes a pin support portion having an insertion hole penetrating in the vertical direction,
The connecting pin is inserted into the insertion hole so as to be movable up and down,
The retaining structure includes a rod that is movable up and down with respect to the connecting pin, and a switching member that is supported by a support shaft with respect to the connecting pin and has an engaging claw portion,
The switching member is rotated about the support shaft by transmission of the vertical movement of the rod;
The switching member is configured such that when the rod is lowered by its own weight with respect to the connecting pin in the connecting position in response to an operation of the operating mechanism, the engaging claw portion is rotated to a side protruding from the connecting pin. , engaging the engaging claw portion from below with a peripheral portion of the insertion hole in the pin support portion;
The switching member is configured such that when the rod is raised in response to an operation of the operating mechanism, the engaging claw portion is rotated to the side where it is recessed into the connecting pin, and the engaging claw portion is rotated to the side where the engaging claw portion is recessed into the connecting pin. The transport vehicle coupling device according to claim 1, wherein the carrier coupling device releases the engagement. The connected portion has an annular shape,
The truck connection frame includes a pin support portion,
The connecting pin is reciprocatably inserted through the pin supporter,
In the connecting position, a portion of the connecting pin including a distal end surface of the connecting pin protrudes from the pin support portion,
When the forward direction of the towing vehicle is the front and the backward direction is the rear,
The retaining structure includes a front inclined portion and a rear inclined portion formed at a portion of the connecting pin located at the connecting position adjacent to the connected portion on a side closer to the tip surface,
The conveyance according to claim 1, wherein the front inclined part is inclined so as to be positioned forward as it approaches the tip surface, and the rear inclined part is inclined so as to be positioned backward as it approaches the tip surface. Trolley coupling device. The trolley connection frame includes a lever support part,
The operating mechanism includes an operating lever rotatably supported by a shaft with respect to the lever support portion,
The operating lever is connected to the connecting pin so as to be capable of transmitting power,
The operating lever is rotatable in a rotation range between a first position in which the connecting pin is located in the connected position and a second position in which the connecting pin is located in the disconnected position,
The retaining structure is bridged between the lever support portion and the operating lever, and has a direction in which the operating lever is biased with an intermediate position between the first position and the second position as the boundary. Equipped with a turnover spring to reverse the
The turnover spring biases the operating lever toward the first position when the operating lever is located between the first position and the intermediate position, and urges the operating lever between the second position and the intermediate position. The transport vehicle coupling device according to claim 1, wherein the operating lever is biased toward the second position when the operating lever is located between the intermediate position and the intermediate position. The rotation shaft of the movable frame portion is rotatably supported by a rotation hole portion of a bearing hole provided in the vehicle frame portion,
The retaining structure includes a slide hole portion forming a part of the bearing hole, the rotation shaft, and a bending pin portion forming a part of the connecting pin,
the slide hole extends from the rotation hole;
The rotation shaft is formed in a shape that can slide with respect to the slide hole in a state where rotation is restricted, and can fit into the slide hole when the connection pin is located at the connection position. ,
4. The transport vehicle coupling device according to claim 3, wherein the bending pin portion is formed on a side including the tip end surface of the coupling pin, and is inclined so as to be positioned rearward as it approaches the tip end surface.

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