JP4783841B2 - Parking brake mechanism for wheelbarrow - Google Patents

Description

  The present invention relates to a parking brake mechanism for braking wheels of various wheelbarrows such as an elderly wheelbarrow, a stroller, and a shopping cart, which are pushed and moved from behind by a user.

  Conventionally, a parking brake mechanism of a handcart has been publicly known. For example, there is one disclosed in Patent Document 1 below. In Patent Document 1, a brake mechanism for a handcart that pulls or releases a brake wire by a brake operation of a brake operation unit provided on a handle to operate or release a brake body disposed in the vicinity of the wheel. The brake operating part is interposed between the handle shaft and the rotating grip, and is connected to one end of the brake wire so as to be rotated in the forward and reverse directions of the rotating grip. There is disclosed a brake mechanism having wire motion conversion means for pulling or releasing a brake wire in a rotating operation.

Japanese Patent Laid-Open No. 2003-19960

  In the handcart described in the above-mentioned Patent Document 1, the brake operation can be performed quickly, but in order to put the handcart in a parked state, the wheel rotates to an angle at which the cylindrical rotating grip can be locked. There was a need to do. In recent years, there has been a demand for a brake mechanism that can put a wheelbarrow into a parked state with a simpler operation.

  Therefore, an object of the present invention is to obtain a parking brake mechanism for a handcart that can be parked with a simple operation as compared with the prior art.

(1) The present invention is capable of rotating with respect to an attachment portion that can be attached to a predetermined location, a button portion that is provided on the attachment portion so as to be able to be pushed in a predetermined direction, and an axis that is provided on the attachment portion. And a lever part having a part that can be in contact with at least a part of the button part, and a brake wire connected to the lever part via a brake wire. A sliding member having a connecting portion and a protruding portion protruding in a direction opposite to the direction extending from the brake wire connecting portion, and is slidably attached along the frame of the handcart, and one end Is connected to the sliding member, and the other end is attached to the frame of the handcart so as to urge the sliding member in a direction opposite to the direction in which the brake wire extends from the brake wire connecting portion. Connectable compression elasticity Provided on the wheel of the wheelbarrow and engageable with the protruding portion of the sliding member, and when the button portion is pushed to a predetermined position, the sliding member The lever portion is rotated by a predetermined angle by the urging force of the compression elastic member via the brake wire so as to move toward the wheel and stopped, and the protrusion portion and the engagement portion of the sliding member are stopped. The joint portion is engaged to lock the rotation of the wheel.

  According to the configuration of (1) above, it is possible to provide a parking brake mechanism for a handcart that can be parked only by a simple operation compared to the conventional art.

(2) In the parking brake mechanism of the handcart of (1) above, the shaft is disposed along the direction in which the button part can be pushed inside the button part, and the lock mechanism is provided with the button part. The inner wall has a groove portion formed in a direction substantially perpendicular to the shaft, and when the button portion is pushed to a predetermined position, a tip of one end portion of the lever portion is fitted into the groove portion and It is preferable that the brake wire is connected to the lever portion so that the lever portion rotates.

  According to the above configuration (2), it is possible to provide a parking brake mechanism for a handcart that can surely be put into a parking state only by a simple operation as compared with the related art, despite the simple configuration.

(3) The parking brake mechanism for the handcart of (2) above includes another compression elastic member that is provided around the shaft and biases the button portion in a direction away from the attachment portion. When the tip of one end portion of the lever portion is fitted in the groove portion of the button portion, the lever portion is operated to rotate in a direction opposite to the direction of rotation so as to be inserted into the groove portion. By pulling out the tip of one end of the lever portion from the groove portion, the sliding member is moved toward the direction away from the mounting portion by the biasing force of the another compression elastic member. It is preferable that the button portion has a portion capable of holding the position of the lever portion after releasing the engagement between the protruding portion and the engaging portion.

  According to the configuration of the above (3), it is possible to provide a parking brake mechanism for a handcart that can release the parking brake with a simple operation.

(4) As another aspect, in the parking brake mechanism of the handcart of (1) above, the button portion is provided on the attachment portion so as to rotate about a substantially central portion, and the lever portion is One end portion supported by the shaft portion so as to rotate in a substantially vertical direction with respect to the direction in which the button portion can be pushed, and the brake wire that can be engaged with the button portion. Including a main body portion having the other end connected thereto, and a handle portion extending from substantially the center of the main body portion, and when the button portion is pushed and rotated to a predetermined position, The other end portion of the lever portion engaged with the button portion is disengaged from the button portion, and the lever portion is rotated by using a biasing force of the compression elastic member via the brake wire. Slide the sliding member Or it may be configured so as to.

  According to the configuration of (4) above, it is possible to provide a parking brake mechanism for a handcart that can surely be put into a parking state only by a simple operation as compared with the related art, despite the simple configuration.

(5) In the parking brake mechanism of the handcart of (4) above, another compression provided between the button portion and the mounting portion and biasing in a direction opposite to the pushing direction of the button portion. An elastic member is provided, and the protruding portion of the sliding member and the engaging portion are engaged to lock the rotation of the wheel, and the handle portion of the lever portion is operated to a predetermined position. Accordingly, when the brake wire is pulled and the engagement between the projecting portion and the engagement portion of the sliding member is released, the urging force of the another compression elastic member is used to press the button portion. It is preferable that the button portion is rotated in a direction opposite to the pushing direction, and the other end portion of the lever portion is engaged with the button portion.

  According to the configuration of (5) above, it is possible to provide a parking brake mechanism for a handcart that can release the parking brake with a simple operation.

(6) In the parking brake mechanism of the handcart of (5) above, a frictional resistance portion for braking is provided on a side opposite to the side where the protruding portion of the sliding member is provided, and the brake An operation of rotating the lever portion by a predetermined angle so as to pull the wire for operation and sliding the sliding member so that the friction resistance portion can come into contact with the wheel. preferable.

  According to the configuration of (6) above, the parking brake of a handcart having a normal brake function that can keep the brake applied and release the brake that has been applied as long as the operator continues to operate. A mechanism can be provided.

It is the schematic perspective view which showed the handcart provided with the parking brake mechanism which concerns on 1st Embodiment of this invention. It is the schematic side view which showed the handcart of FIG. It is a schematic sectional drawing which shows the structure of the handle | steering-wheel part of the handcart shown in FIG. 1, and the button part periphery of a parking brake mechanism. FIG. 2 is a partially cutaway view of a configuration around a button portion in the parking brake mechanism of the handcart shown in FIG. 1, in which (a) shows a state before the parking brake mechanism operates, and (b) shows parking. It is a figure which shows the state after operation | movement of a brake mechanism. It is a figure which shows the structure of the sliding member periphery in the parking brake mechanism of the handcart shown in FIG. It is the schematic perspective view which showed the handle | steering-wheel part of the handcart to which the parking brake mechanism which concerns on 2nd Embodiment of this invention was attached. (A) is a schematic side view which shows the structure of the button part periphery of the parking brake mechanism shown in FIG. 6, (b) is AA arrow sectional drawing of (a). (A) is a schematic top view which shows the structure of the button part periphery of the parking brake mechanism shown in FIG. 6, (b) is BB arrow sectional drawing of (a). FIG. 7 is a partially cutaway view of a configuration around a button portion in the parking brake mechanism of the handcart shown in FIG. It is a figure which shows the state after operation | movement of a brake mechanism.

<First Embodiment>
Hereinafter, with reference to FIGS. 1-5, the handcart provided with the parking brake mechanism which concerns on 1st Embodiment of this invention is demonstrated. For convenience, a brake wire, which will be described later, may not be shown.

  As shown in FIGS. 1 and 2, the handcart 100 includes a pair of left and right front frame bodies 1a and 1b, a pair of left and right rear frame bodies 2a and 2b, and a pair of left and right back frame bodies 3a and 3b. A pair of left and right movable members 4a and 4b, a frame member 5, a pair of left and right first connecting rods 6a and 6b, a pair of left and right second connecting rods 7a and 7b, a lock mechanism 20, and a parking brake mechanism are provided. It is what.

  Wheels 9 are pivotally attached to the lower end portions of the front frame bodies 1 a and 1 b via a swing mechanism 8. The wheel 9 is formed by juxtaposing two wheels, and the two wheels are rotatably supported at both ends of a shaft (not shown) provided in the swing mechanism 8. Further, the back frame bodies 3a and 3b are fixed to the respective upper end portions of the front frame bodies 1a and 1b, and the upper end portions of the rear frame bodies 2a and 2b are rotatably supported and connected. 12a and 12b are provided.

  Wheels 10 that are rotatable in the front-rear direction are pivotally attached to lower ends of the rear frame bodies 2a and 2b. The upper ends of the rear frames 2a and 2b are connected to connection members 12a and 12b provided at the upper ends of the front frames 1a and 1b so as to be rotatable by a predetermined angle.

  A handle portion 11 is provided at the upper ends of the back frame bodies 3a and 3b, and the lower ends of the back frame bodies 3a and 3b are fixed to the connecting members 12a and 12b.

  The movable members 4a and 4b are provided so as to be movable along the longitudinal direction of the front frame bodies 1a and 1b from the lower ends of the connection members 12a and 12b to the middle of the front frame bodies 1a and 1b. It has been. A lock mechanism 20 is installed between the movable members 4a and 4b to lock the movable members 4a and 4b at predetermined positions of the front frame bodies 1a and 1b.

  The locking mechanism 20 includes a connecting horizontal pipe 21 that integrally connects the movable members 4a and 4b to the movable members 4a and 4b, and a pair of left and right slidably housed in a hollow portion of the connecting horizontal pipe 21. Rod-shaped lock pins (not shown), and operation knobs 22a and 22b that are fixed to the lock pins and project outward from slots 23a and 23b that are formed at predetermined positions of the connecting horizontal pipe 21 in the axial direction. , Is provided. In addition, a plurality of positioning holes (not shown) that cooperate with the lock pins (not shown) are formed in the longitudinal direction of the front frames 1a and 1b on the opposing surface side of the front frames 1a and 1b. After adjusting the height position of the movable members 4a and 4b with respect to the front frame bodies 1a and 1b, the operation knobs 22a and 22b are operated so that the front ends of the lock pins are moved to the front frame body 1a. The movable members 4a and 4b can be fixed to the front frame bodies 1a and 1b by being inserted into the corresponding positioning holes 1b. The lock mechanism 20 is disposed between the above-described pair of left and right lock pins (not shown) and elastically attaches each lock pin toward the facing front frame 1a, 1b. A compression elastic member such as a compression spring or a rubber member is provided, and with the left and right operation knobs 22a and 22b being brought close to each other, the tip of each lock pin is inserted into the corresponding positioning hole of each front frame 1a and 1b. After the positioning, by releasing the left and right operation knobs 22a and 22b, the tip ends of the lock pins can be inserted into the corresponding positioning holes of the front frame bodies 1a and 1b.

  The frame member 5 is a substantially U-shaped member, and can be used as a seat portion by stretching a seat or as a part of a luggage compartment portion by attaching an edge portion of a bag-like sheet. ing. In FIG. 1, a seat is formed by stretching a seat.

  Each of the first connecting rods 6a and 6b is pivotally connected to each side of the frame member 5 and each other end is pivotally connected to each movable member 4a and 4b. is there.

  Each of the second connecting rods 7a and 7b is rotatably connected at one end to the substantially middle part of the rear frame 2a and 2b and is rotatably connected at the other end to the movable members 4a and 4b. It is what.

  The parking brake mechanism mainly includes a button part 30, an attachment part 34a, a sliding member 40, a winding spring 41 (compression elastic member), and an engaging part 42.

  As shown in FIG. 3, the attachment portions 34 a and 34 b are attached to both side portions of the handle portion 11. A shaft 32 is provided on the attachment portion 34a toward the outside in the longitudinal direction of the handle portion 11, and a shaft 33 is provided on the attachment portion 34b toward the outside in the longitudinal direction of the handle portion 11. In addition, a substantially U-shaped lever portion 31 is provided along the longitudinal direction of the handle portion 11 (see FIG. 1), and can be rotated around the handle portion 11 by a predetermined angle around the shafts 32 and 33. One end 31a of the lever portion 31 is supported on the shaft 32, and the other end 31b of the lever portion 31 is supported on the shaft 33 (see FIG. 3). As shown in FIG. 4, one end of the wire in the brake wire portion 35 is connected to one end portion 31 a of the lever portion 31 and extends downward from the attachment portion 34. As shown in FIG. 3, the button portion 30 is provided around the shaft 32 so that it can slide along the longitudinal direction of the shaft 32 outside the one end portion 31 a of the lever portion 31.

  The button part 30 has, on the inner wall, a groove part 30a formed in a direction substantially perpendicular to the shaft 32, and a protrusion part 30b that temporarily stops the downward rotation of the one end part 31a of the lever part 31. Is. The width of the groove portion 30a is configured to be larger than the thickness of the tip end portion 31a of the lever portion 31, and the groove portion 30a slides toward the mounting portion 34a as the button portion 30 is pushed. The tip of one end portion 31a of the lever portion 31 is inserted and the lever portion 31 can be rotated downward. A winding spring 36 (compression elastic member) that urges the button portion 30 in a direction away from the attachment portion 34 a is provided around the shaft 32. As a result, when the distal end portion of the one end portion 31a of the lever portion 31 is inserted into the groove portion 30a of the button portion 30, the direction opposite to the direction in which the lever portion 31 rotates to be inserted into the groove portion 30a (here, When the operator operates to rotate upward), the distal end portion of the one end portion 31a of the lever portion 31 is extracted from the groove portion 30a, and the button portion 30 is moved away from the mounting portion 34a by the urging force of the winding spring 36. It can be moved automatically toward. Here, as a modification, instead of the winding spring 36, a compression elastic member such as a rubber member having the same function may be used.

  As shown in FIG. 5, the sliding member 40 is slidably attached in the longitudinal direction (arrow direction in FIG. 5) of the rear frame 2a at a position adjacent to the wheel 10 below the rear frame 2a. The moving member main body 40a, the brake wire connecting portion 40b to which the other end of the wire in the brake wire portion 35 is connected and fixed, and the protruding portion 40c protruding in the direction opposite to the direction extending from the brake wire connecting portion And a frictional resistance portion 40d for a normal brake provided on the side opposite to the side on which the protruding portion 40c is provided. When the parking brake mechanism is not operating, the frictional resistance portion 40d performs an operation of rotating the lever portion 31 by a predetermined angle so as to pull the wire in the brake wire portion 35, and slides the sliding member 40 upward. By making it move, it can come into contact with the inside of the wheel 10, and in this embodiment, it also has a general brake mechanism.

  As shown in FIG. 5, the winding spring 41 has one end connected to the sliding member 40 and the other end opposite to the direction in which the wire in the brake wire portion 35 extends from the brake wire connecting portion 40b. The sliding member 40 is connected to the rear frame 2a so as to urge the sliding member 40. Here, as a modification, a compression elastic member such as a rubber member may be used instead of the winding spring 41.

  As shown in FIG. 5, the engaging portion 42 is formed radially around the axle 43, and inside the vehicle radiating portion 10 a (not shown in FIG. 5, see FIG. 2) of the wheel 10. It is fixed and can be engaged with the protruding portion 40 c of the sliding member 40.

  Next, an example of the parking brake operation and the parking brake release operation of the parking brake mechanism according to the present embodiment will be described with reference to FIGS. 1, 4, and 5.

(Parking brake operation)
First, the button portion 30 is pushed to a predetermined position, and the biasing force of the winding spring 41 via the brake wire portion 35 is changed from the state before the operation of the parking brake mechanism (see FIGS. 1 and 4A). Utilizing this, the tip of the one end 31a of the lever 31 is fitted into the groove 30a, and the lever 31 is operated to rotate downward by a predetermined angle (see FIG. 4B). In conjunction with this, the sliding member 40 moves from the state shown in FIG. 5 toward the wheel 10 side, and the protrusion 40c and the engaging portion 42 of the sliding member 40 are engaged. Is locked. Thereby, parking of the handcart 100 is performed.

(Parking brake release operation)
First, from the state after the operation of the parking brake mechanism (see FIG. 4B), the lever portion 31 is operated to be pulled upward, and is engaged with the protruding portion 40c of the sliding member 40 via the brake wire portion 35. The engagement with the portion 42 is released, and each part is brought into the state shown in FIG. At this time, the button part 30 returns to the state before the operation of the parking brake mechanism (see FIG. 4A) by the urging force of the winding spring 36. Subsequently, by stopping the operation of the lever part 31, the tip part of the one end part 31a of the lever part 31 comes into contact with the tip part of the protrusion 30b, and the lever part 31 is latched so as not to rotate downward. Thereby, parking of the handcart 100 is cancelled | released and it can drive | work.

  According to the present embodiment, it is possible to provide a parking brake mechanism of the handcart 100 that can be brought into a parking state only by performing an operation that is simpler than that in the past, that is, an operation of pushing the button unit 30. Further, since the handle portion 11 can be easily operated with a hand attached, the safety is higher than the conventional one.

  Moreover, the parking brake mechanism of the handcart 100 which can release a parking brake only by simple operation of pulling up the lever part 31 can be provided.

  In addition, it has a normal brake function that allows the brake to be applied as long as the operator continues to pull up the lever portion 31 or that the operator can release the brake that has been applied by releasing the lever portion 31. A parking brake mechanism for the handcart 100 can be provided.

Second Embodiment
Next, a parking brake mechanism according to a second embodiment of the present invention will be described with reference to FIGS. In addition, since parts other than the attachment part, the button part, and the lever part in the parking brake mechanism according to the present embodiment are the same as those in the first embodiment, description thereof may be omitted.

  As shown in FIG. 6, the parking brake mechanism according to the present embodiment includes an attachment portion 51 that can be attached to one end portion of a substantially U-shaped handle portion 61 provided with grips 62 at both tip portions, and a substantially central portion. A button portion 52 provided on the attachment portion 51 so as to rotate about the center, and a lever portion 53 supported rotatably on a shaft portion 51a provided inside the attachment portion 51. is there. The handle portion 61 can be attached to various types of handcarts.

  As shown in FIG. 7B, the button part 52 has a substantially U-shaped cross section. A spring member 55 is provided between the attachment portion 51 and the button portion 52 to urge the button portion 52 in a direction opposite to the pushing direction of the button portion 52 (see the arrow in FIG. 7B). Here, as a modification, a compression elastic member such as a rubber member may be used instead of the spring member 55.

  As shown in FIG. 8B, the lever portion 53 is supported by the shaft portion 51a so as to rotate in a direction substantially perpendicular to the direction in which the button portion 52 can be pushed, and A main body having an other end 53b that can be engaged with the lower portion of the button 52 and connected to the wire in the brake wire 54, and a handle 53c extending from the approximate center of the main body. It is equipped with. Note that the wire in the brake wire portion 54 is fixedly connected to a sliding member similar to that of the first embodiment (having the same configuration as the sliding member 40 shown in FIG. 5). In addition, when the parking brake mechanism is not operating, the frictional resistance part similar to that in the first embodiment (having the same configuration as the frictional resistance part 40d shown in FIG. 5) pulls the wire in the brake wire part 54. The lever 53 is rotated by a predetermined angle, and the sliding member is slid upward, so that the inside of the wheel (same configuration as the wheel 10 shown in FIG. 5) is the same as that of the first embodiment. In this embodiment, it also has a general brake mechanism.

  Next, an example of the parking brake operation and the parking brake release operation of the parking brake mechanism according to the present embodiment will be described with reference to FIGS.

(Parking brake operation)
First, the button 52 is pushed in the direction of the arrow shown in FIG. 7B, and the state before the operation of the parking brake mechanism (see FIGS. 7 and 9A) is passed through the brake wire 54. The other end portion of the lever portion 53 engaged with the button portion 52 is removed from the button portion 52 using the biasing force of the wound spring (having the same configuration as the winding spring 41 shown in FIG. 5) (FIG. 9). (See (b)). In conjunction with this, when the lever portion 53 rotates, the sliding member moves toward the wheel (having the same configuration as the wheel 10 shown in FIG. 5), and the protruding portion (see FIG. 5 and the engaging portion (having the same configuration as the engaging portion 42 shown in FIG. 5) engage with each other, so that the rotation of the wheel is locked. Thereby, the wheelbarrow can be parked.

(Parking brake release operation)
First, from the state after the operation of the parking brake mechanism (see FIG. 9B), the handle 53c of the lever 53 is pulled up to a predetermined position, and the wire in the brake wire 54 is pulled and slid. The engagement between the protruding portion 40c of the member 40 and the engaging portion 42 is released, and each part is brought into the state shown in FIG. 5 as in the first embodiment. At this time, the button part 52 is rotated in the direction opposite to the pushing direction by the urging force of the spring member 55 and returns to the state before the operation of the parking brake mechanism (see FIGS. 7 and 9A). Subsequently, by stopping the operation of the lever portion 53, the other end portion 53b of the lever portion 53 comes into contact with the button portion 52, and is engaged or latched so that the lever portion 53 does not rotate downward. Thereby, parking of the wheelbarrow is cancelled | released and it can drive | work.

  According to the configuration of the present embodiment, it is possible to provide a parking brake mechanism for a handcart that can be parked simply by performing an operation that is simpler than that of the prior art, that is, an operation of pushing the button portion 52. Further, since it is possible to easily operate the grip 62 with a hand on it, the safety is higher than the conventional one.

  Moreover, the parking brake mechanism of the handcart which can release a parking brake only by simple operation of pulling up the lever part 53 can be provided.

  In addition, the brake function continues to be applied as long as the operator continues to pull up the lever portion 53, and the brake function that allows the operator to release the brake that has been applied by releasing the lever portion 53 is also provided. Can provide a parking brake mechanism for a handcart.

  Moreover, since the lever part 53 is one of the shapes of the brake structure which exists conventionally, the parking brake mechanism which is easy to operate for various persons, such as a young person and an elderly person, can be provided.

<Modification>
The present invention can be modified in design without departing from the scope of the claims, and is not limited to the above embodiments and modifications. For example, in each of the above-described embodiments, the attachment portion is attached to the handle portion. It may be made possible at various parts of the car.

  Moreover, in each said embodiment, although the parking brake mechanism which can stop and park only one wheel among the wheels in a wheelbarrow was shown, it parks by stopping only rotation of the other wheel among the wheels in a wheelbarrow. It is good also as a parking brake mechanism which can be used, and it is good also as a parking brake mechanism which can park by stopping rotation of two or more wheels in a wheelbarrow. In addition, when employ | adopting the parking brake mechanism which can park by stopping rotation of both rear wheels, it is preferable from the viewpoint of safety to provide a pair of left and right parking brake mechanisms that can be operated independently by one hand.

1a, 1b Front frame 2a, 2b Rear frame 3a, 3b Back frame 4a, 4b Movable member 5 Frame members 6a, 6b First connecting rod 7a, 7b Second connecting rod 8 Swing mechanism 9, 10 Wheel 10a Vehicle radiation part 11, 61 Handle part 12a, 12b Connection member 21 Connection horizontal pipe 22a, 22b Operation knob 23a, 23b Slot 20 Lock mechanism 30, 52 Button part 30a Groove part 30b Projection part 31, 53 Lever part 32, 33 Shaft 34a, 34b, 51 Mounting portion 35, 54 Brake wire 36, 41 Winding spring 40 Sliding member 40a Sliding member main body 40b Brake wire connecting portion 40c Protruding portion 40d Friction resistance portion 42 Engaging portion 43 Axle 51a Shaft portion 53a One end 53b Other end 53c Handle 55 Spring member 62 Grip 100 Wheelbarrow

Claims (5)

A mounting portion that can be mounted near the handle of a wheelbarrow having wheels ;
A button portion provided in the mounting portion and provided so as to be able to be pushed in a horizontal direction ;
One end portion is supported so as to be rotatable with respect to the shaft provided in the attachment portion, and a lever portion having a portion capable of contacting at least a part of the button portion;
A brake wire connecting portion connected via a brake wire from the lever portion;
Has a protrusion protruding from an outer peripheral direction of the wheel towards the axle direction, and a sliding member attachable slidably along the frame of the wheelbarrow,
A compression elastic member provided along the lower end side of the brake wire and having one end connected to the sliding member and the other end connected to the frame of the handcart;
Provided in the vehicle axis of the wheelbarrow, and a said projection engageable with the engaging portion of the sliding member,
When the button part is pushed to a predetermined position, the sliding member is moved toward the axle , and the lever part is rotated by a predetermined angle by the urging force of the compression elastic member via the brake wire. A parking brake mechanism for a handcart, wherein the protruding portion of the sliding member and the engaging portion engage with each other to lock the rotation of the wheel. The shaft is arranged along the direction in which the button part can be pushed inside the button part,
The button part has a groove part formed in a direction substantially perpendicular to the axial direction of the shaft on the inner wall of the button part ,
2. The handcart according to claim 1, wherein when the button portion is pushed to a predetermined position, the lever portion rotates, and a tip of one end portion of the lever portion is fitted into the groove portion . Parking brake mechanism. A second compression elastic member provided around the shaft and biasing the button portion in a direction protruding from the attachment portion;
When the tip of one end portion of the lever portion is fitted in the groove portion of the button portion, the attachment portion is moved by the biasing force of the second compression elastic member by moving the lever portion toward the handle side. It said button portion moves in a direction to protrude from the tip of the one end portion is issued vent of the lever portion from the inside to the formed groove of the button portion, the engagement between the projecting portion of the sliding member 3. The parking brake for a handcart according to claim 2, wherein the button portion has a portion capable of holding the position of the lever portion after the engagement with the joint portion is released. 4. mechanism. A mounting portion that can be mounted near the handle of a wheelbarrow having wheels ;
A button portion provided in the attachment portion and provided so as to be rotatable about an axis provided substantially in the center ;
A third compression elastic member provided on the shaft of the button part ;
A lever portion having a portion capable of contacting at least a part of the button portion;
A brake wire connecting portion connected via a brake wire from the lever portion;
And slidably attachable slide member from the outer peripheral direction has a protrusion protruding toward the axle direction, and along the frame of the wheelbarrow of the wheel,
A compression elastic member provided along the lower end side of the brake wire and having one end connected to the sliding member and the other end connected to the frame of the handcart;
Provided in the vehicle axis of the wheelbarrow, and a said projection engageable with the engaging portion of the sliding member,
When the button portion is rotated , the sliding member is moved toward the axle , and the lever portion is rotated by a predetermined angle by the urging force of the compression elastic member via the brake wire and stopped. And the protrusion of the sliding member and the engagement portion engage to lock the rotation of the wheel,
When the lever portion is rotated to the handle side, the button portion is configured to rotate in a direction opposite to the rotation direction of the button portion using the biasing force of the third compression elastic member. A parking brake mechanism for a wheelbarrow characterized by that. A frictional resistance portion for braking is provided on the side opposite to the side where the protruding portion of the sliding member is provided,
The friction resistance portion can be brought into contact with the wheel by sliding the sliding member by rotating the lever portion by a predetermined angle so as to pull the brake wire. The parking brake mechanism for a handcart according to any one of claims 1 to 4 .