JP3713670B2 - Door locks for special vehicles such as construction machinery - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a door lock that is applied to a door for a cabin of a construction machine or a specially equipped vehicle.
[0002]
[Prior art]
Such door locks are found in Japanese Patent Publication No. 58-43549 and Japanese Patent Publication No. 59-3619, and the like, and a lock arm that engages and holds a rotating latch arm and a latch arm in a state of capturing a striker in a capturing posture. And a release lever for releasing the engagement of the lock arm, a cancel mechanism for disabling the release operation of the release lever, and the like. is there. This type of door lock is mainly applied to passenger cars.
[0003]
[Problems to be solved by the invention]
Since this type of conventional door lock has a large number of parts and a large number of assembly steps, the overall cost is high. Especially in recent door locks, the number of parts is further increased and the structure is becoming more complicated in order to prevent unauthorized unlocking and remote control from the driver's seat. While door locks applied to cabin doors for construction machines and specially equipped vehicles are desired to have the basic functions of door locks for passenger cars, for example, special functions such as unauthorized unlocking prevention functions and remote control functions Is unnecessary, and rather, robustness and low cost are desired.
[0004]
Accordingly, an object of the present invention is to provide a door lock suitable for a special vehicle such as a construction machine that has a simple structure and can be easily assembled, and thus can be manufactured at low cost.
[0005]
[Means for Solving the Problems]
The door lock of the present invention has a case 1 press-molded as shown in FIG. 1 and a plastic-molded housing 3. The guide arm 7 for the striker S provided in the case 1 and the housing 3 has a latch arm 4 that rotates and a lock arm 5 that engages and holds the latch arm 4. The lock arm 5 is attached to the case 1. A release lever 6 for unlocking operation and a cancel mechanism for disabling the unlocking operation of the release lever 6 are provided.
[0006]
As shown in FIG. 2, the cancel mechanism is slidable up and down by a switching lever 19 supported on the inner surface of the side wall 8 on the case 1 side so as to be tiltable back and forth by a shaft 23 and an operation claw 24 provided at the lower end of the shaft 23 and the switching lever 19. And a click spring 21 that holds the switching lever 19 in the forward / backward switching tilt position.
[0007]
A release lever 6 is supported by a shaft 31 so as to be able to swing back and forth on the lower portion of the side wall 8 of the case 1, and an operating pin 32 fixed to the operating arm is in contact with a passive wall 34 at the lower end of the transmission lever 20. The unlocking operation of the release lever 6 is performed only when the transmission lever 20 is switched to the transmission position by the switching lever 19 and the release claw 27 protruding below the transmission lever faces the passive arm 15 of the lock arm 5. 20 is transmitted to the lock arm 5 via 20.
[0008]
Specifically, the latch arm 4 and the lock arm 5 are rotatably supported by the cylindrical shaft 2 that caulks and fixes the housing 3 and the case 1. The latch arm 4 is urged to rotate in a direction in which the engagement with the striker S is released by a spring 16 fitted on the cylindrical shaft 2. The lock arm 5 is urged to rotate in a direction to engage with the latch arm 4 by a spring 17 fitted on the cylindrical shaft 2. It is assumed that spring recesses 11, 11 for accommodating both springs 16, 17 are formed in the inner surface of the housing 3.
[0009]
[Action]
The release lever 6, the switching lever 19 and the transmission lever 20 are collectively arranged on the side wall 8 of the case 1, and the levers 6, 19, 20 are attached to the side wall 8 by shafts 23, 31. The assembling work for the side walls 8 of 19 and 20 and the assembling work of the latch arm 4, the lock arm 5, and the housing 3 for the main surface wall 1a of the case 1 can be easily performed separately. Since the shaft 23 for the switching lever 19 and the operation claw 24 provided on the switching lever 19 are used, the transmission lever 20 is slidably supported, and the transmission lever 20 is tilted back and forth with the switching lever 19. It is possible to switch between an operation for transmitting the movement of the release lever 6 to the lock arm 5 and a cancel operation with a small number of parts.
[0010]
When the springs 16 and 17 for the latch arm 4 and the lock arm 5 are respectively accommodated in the spring recesses 11 provided in the housing 3, the cylindrical shaft 2, the springs 16 and 17, and the arms 4 and 5 are sequentially placed in the housing 3. Since the temporarily assembled state can be maintained by assembling, these members can be handled as one member, and the case 1 can be more easily assembled.
[0011]
【The invention's effect】
According to the door lock of the present invention, the number of component parts can be reduced as compared with the conventional door lock, and the assembly of each part with respect to the case 1 is divided into the side wall 8 side and the main surface wall 1a side, and individually assembled. As a whole, a door lock that can be manufactured at low cost can be obtained. Since the number of parts is small, it is advantageous in that it is difficult to break down and has excellent durability.
[0012]
【Example】
1 to 5 show an embodiment of a door lock for a right door according to the present invention. In FIG. 1, the door lock has a case 1 made of a press-formed product of a steel plate or a stainless steel plate and a housing 3 that is caulked and fixed to the case 1 with three cylindrical shafts 2 as opposed members. It has a latch arm 4 and a lock arm 5 arranged between the surfaces, a release lever 6 for unlocking the lock arm 5, and a cancel mechanism for invalidating the unlocking operation of the release lever 6.
[0013]
The case 1 is formed in a thin box shape having a front surface opened by a rectangular main surface wall 1a and a peripheral wall folded along its side, and a guide for the striker S is formed in the middle of the main surface wall 1a. The groove 7 is provided horizontally. The guide groove 7 is opened at the right edge of the main surface wall 1a. A left side edge of the main surface wall 1a has a side wall 8 for attaching a release lever 6 and a cancel mechanism. In FIG. 3, the central portion of the main surface wall 1a including the guide groove 7 is ejected to the inner surface side, and the latch arm 4 and the lock arm 5 are assembled to this projecting portion 1b, and the case 1 of both arms 4 and 5 is assembled. The friction between the arms 4 and 5 due to the deformation of the main surface wall 1a is avoided as much as possible.
[0014]
3 and 4, the housing 3 is composed of a plate-like block that fits into the case 1, and a guide groove 7 having the same shape and the same size as the guide groove 7 is provided in the middle of the upper and lower sides. Are provided with three insertion holes for the cylindrical shaft 2. An inner wall of the housing 3 is provided with an edge wall 3 a that comes into contact with the case 1, and has a first recess 10 that accommodates the latch arm 4 and the lock arm 5. Furthermore, the spring recessed part 11 is provided in the inner surface side of the insertion hole of the cylinder shaft 2 which supports each arm 4 * 5. The spring recess 11 is provided with a spring receiving groove 11a for receiving one spring arm of each of the springs 16 and 17.
[0015]
In FIG. 5, the latch arm 4 is formed by punching a thick plate, and has a lock groove 12 for capturing and engaging the striker S at a lower portion of the plate surface, and the engaging claw 13 is obliquely adjacent to the lock groove 12. It protrudes downward. The latch arm 4 is pivotally supported by a cylindrical shaft 2 above the guide groove 7 and is arranged around the cylindrical shaft 2 between an unlocked position indicated by an imaginary line in FIG. 1 and a locked position indicated by a solid line in FIG. Can be rotated.
[0016]
In FIG. 5, the lock arm 5 is formed in a laterally long shape obtained by punching a thick plate, and has a hook claw 14 that engages with the engagement claw 13 on the upper surface of the right end of the arm body, and the other end ( It has a passive arm 15 on the left side. By pivotally supporting the central portion of the arm body with the cylindrical shaft 2 below the guide groove 7, the lock arm 5 can swing the claw 14 and the passive arm 15 up and down like a seesaw around the cylindrical shaft 2. The latch arm 4 is rotated and biased in a direction to release the engagement with the striker S by a torsion coil spring 16 as shown by the arrow in FIG. 1, and the lock arm 5 is twisted by a torsion coil spring 17. The pawl 14 is urged to rotate so as to engage with the latch arm 4.
[0017]
FIG. 2 shows the release lever 6 and the cancel mechanism. The cancel mechanism includes a switching lever 19 provided on the inner surface of the side wall 8 of the case 1, a transmission lever 20 that is tilted back and forth by the lever 19, a click spring 21 assembled to each lever 19, 20 and a return spring 22. It consists of.
[0018]
The switching lever 19 has a leg-shaped arm portion 19a whose midway portion is supported by a shaft 23 so as to be tiltable back and forth, and an operation portion 19b that bends inward continuously from the upper end of the arm portion 19a. An operation claw 24 is folded and formed at the lower end of 19a. One end of a click spring 21 made of a torsion coil spring is hooked on the operation portion 19b, and the other end of the spring 21 is hooked on the housing 3 side. When the switching lever 19 tilts back and forth about the shaft 23, the click spring 21 tilts back and forth around the dead center around the latching point with the housing 3, and at each tilting position, the click lever 21 Hold posture. An operation rod 26 is connected to the operation portion 19b via a connector 25.
[0019]
The transmission lever 20 is made of a plate material that is long in the vertical direction, and a release claw 27 projects from the lower edge of the lower end. On the plate surface of the transmission lever 20, a slide groove 28 guided by the shaft 23 is provided in the upper half portion, and a groove 29 that engages with the operation claw 24 is provided in the lower half portion. A projecting piece is folded at the lower end of the latter groove 29, and a tension coil-shaped spring 22 is latched between the projecting piece and the lower peripheral wall of the case 1.
[0020]
The transmission lever 20 can be tilted and displaced forward and backward by the switching lever 19, and can be slid up and down using the shaft 23 and the operation claw 24 as a guide. As shown in FIG. 2A, in a state where the transmission lever 20 is tilted to the transmission posture, the release claw 27 faces the passive arm 15 of the lock arm 5, so that the transmission lever 20 is moved by the release lever 6. The lock arm 5 can be unlocked by pushing up against the spring 22.
[0021]
The release lever 6 is a bell crank type lever, and a middle portion thereof is supported below the side wall 8 by a shaft 31 so as to be swingable back and forth, and an operating pin 32 for operating the transmission lever 20 is provided on an operating arm extending to the rear side. It is fixed. An operating rod 33 is connected to the operating portion above the release lever 6 via a connector 25. The operating pin 32 is always in contact with the passive wall 34 at the lower end edge of the transmission lever 20. Accordingly, when the release lever 6 is unlocked as shown by the arrow in FIG. 2A, the transmission lever 20 receives the movement and slides upward. When it is desired to invalidate the unlocking operation, the transmission lever 20 is tilted to the front side of the case by the switching lever 19 as shown by the broken line arrow in FIG. 2A and released as shown in FIG. The slide locus of the claw 27 is positioned on the front side of the passive arm 15 of the lock arm 5. An arc projection 35 is provided at the center of the passive wall 34 in order to stabilize the contact position between the operating pin 32 and the passive wall 34 when the transmission lever 20 is tilted back and forth.
[0022]
Next, a procedure for assembling the door lock will be described. After assembling each part to the side wall 8 of the case 1, the parts are assembled to the main surface wall 1a. Specifically, the release lever 6 is disposed on the inner surface of the side wall 8, the shaft 31 is inserted, and the release lever 6 is caulked and attached to the side wall 8. Similarly, the switching lever 19 and the transmission lever 20 are attached by caulking to the side wall 8 by the shaft 23.
[0023]
Next, the cylinder shaft 2 is inserted into the upper and lower sides of the housing 3, and the springs 16, 17, the latch arm 4, and the lock arm 5 are sequentially inserted into each cylinder shaft 2. At this time, the springs 16 and 17 are accommodated in the spring recess 11, and one end of the spring arm is fitted into the spring receiving groove 11a. Further, the other spring arm is hooked on each of the arms 4 and 5. In this state, the engaging claw 13 of the latch arm 4 contacts the stopper wall 3 b (see FIG. 4) facing the guide groove 7, and the protruding end of the claw 14 of the lock arm 5 contacts the peripheral edge of the latch arm 4. And since it maintains a temporary assembly state, the whole can be handled as one unit. Thereafter, the housing 3 is housed in the case 1, and the three cylindrical shafts 2 are caulked and fixed on the rear surface side of the case 1, whereby the arms 4 and 5 and the housing 3 are assembled together. Finally, the click spring 21 and the spring 22 are respectively assembled at predetermined positions. The tube hole of each tube shaft 2 is used as an attachment hole for fixing the door lock to the door.
[0024]
According to the door lock of the present invention, each part can be assembled separately on the side wall 8 side and the main surface wall 1a side of the case 1, and the latch arm 4, the lock arm 5, and both arms 4 and 5 can be separately assembled. Since the springs 16 and 17 can be temporarily assembled and mounted on the housing 3, the assembly is easy as a whole, and the number of steps can be reduced. It is also advantageous in that the number of parts is small compared to this type of existing door lock.
[Brief description of the drawings]
FIG. 1 is a front view of a door lock.
2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 2 (a) shows a state where the transmission lever is switched to the transmission position, and FIG. 2 (b) shows a state where the transmission lever is switched to the cancel position. Indicates the state.
FIG. 3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a perspective view of a housing.
FIG. 5 is a perspective view showing only an operating part of the door lock.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Tube shaft 3 Housing 4 Latch arm 5 Lock arm 6 Release lever 7 Guide groove 8 Side wall 15 Passive arm 19 Switching lever 20 Transmission lever 21 Click spring 22 Spring 23 Shaft 24 Operation claw 31 Shaft 32 Actuation pin 34 Passive wall S Striker

Claims (2)

A press-molded case 1 and a plastic-molded housing 3 are provided. A latch arm 4 that rotates and a latch arm 4 are engaged above and below a guide groove 7 for a striker S provided in the case 1 and the housing 3. A door lock having a lock arm 5 to hold together, a release lever 6 for unlocking the lock arm 5 on the case 1, and a cancel mechanism for disabling the unlocking operation of the release lever 6. ,
The cancel mechanism is supported on the inner surface of the side wall 8 on the case 1 side by a switching lever 19 supported by a shaft 23 so as to be tiltable back and forth, and an operating claw 24 provided at the lower end of the shaft 23 and the switching lever 19 so as to be slidable up and down. A transmission lever 20 that is energized on standby in 22 and a click spring 21 that holds the switching lever 19 in the forward and backward switching tilt position;
The release lever 6 is supported on the lower portion of the side wall 8 of the case 1 so as to be swingable back and forth by a shaft 31, and an operating pin 32 fixed to the operating arm is in contact with a passive wall 34 at the lower end of the transmission lever 20,
The unlocking operation of the release lever 6 is performed only when the transmission lever 20 is switched to the transmission position by the switching lever 19 and the release claw 27 protruding below the transmission lever faces the passive arm 15 of the lock arm 5. A door lock for a special vehicle such as a construction machine configured to be transmitted to the lock arm 5 via 20. A latch arm 4 and a lock arm 5 are rotatably supported by a cylindrical shaft 2 for caulking and fixing the housing 3 and the case 1, respectively.
The latch arm 4 is urged to rotate in a direction to release the engagement with the striker S by a spring 16 fitted on the cylindrical shaft 2.
The lock arm 5 is urged to rotate in a direction to engage with the latch arm 4 by a spring 17 fitted on the cylindrical shaft 2.
The door lock for a special vehicle such as a construction machine according to claim 1, wherein spring recesses (11, 11) for accommodating both springs (16, 17) are formed in the inner surface of the housing (3).

Images