JPS5922864Y2 - Driver cab door locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking device for holding the driver's cab door of construction machinery in an open state.

In construction machinery, it is often necessary to work with the door of the driver's cab open due to ventilation, work convenience, etc., and in this case, a locking device is required to keep the door open.

In this case, construction machinery generates large vibrations during work,
Even if the door is opened and locked, there is a risk that the door may become unlocked unexpectedly due to vibration.

On the other hand, when releasing this lock, there is an inconvenience in that the operation cannot be performed without going outside the driver's cab, and countermeasures have been desired.

Conventional locking devices that are generally known to solve these problems are shown in FIGS. 1 and 2.

A lock holder 4 is fixed to the open side of a door 3 which is rotatably attached to a driver's cab 1 with hinges 2, 2.

and a cushion mechanism 5 that stops the door from rotating when the door is opened, and the lock holder 4 that stops the door from rotating when the door is opened.
A hook device 6 that engages with the door to lock the rotation of the door is fixedly installed in the driver's cab 1.

FIG. 2 shows a state in which the door 3 is locked by the above-mentioned device, and is an enlarged cross-sectional view taken along line II-II in FIG. 1.

The cushion mechanism 5 biases the cushion rubber 7 in the direction of arrow A by a spring 8.

The hook device 6 has a hook 10 integrally formed with the bundle 9.
It is rotatably supported by a pin 11, and cannot be rotated any further in the direction of the arrow BJj by the collar 1a.

In this conventional device 13, when the door 3 is opened and collides with the cushion rubber 7 in the direction of arrow C, the cushion rubber 7 moves slightly backward in the direction of arrow C.

At this time, the hook] 0 catches the lock bracket 4, and then the door moves as indicated by the arrow A by the restoring force of the coil spring 8.
The hook 10 continues to lock the lock receiving fitting 4 while resisting this urging force.

Furthermore, this device is configured to unlock the lock receiving fitting 4 by manually moving the bundle 9 in the direction opposite to the arrow B.

However, when this conventional device is used for the door of a driver's cab that is subject to severe vibrations of construction machinery, etc., the door 3 vibrates in the directions of arrows A and C within the range of deflection of the cushion mechanism 5 of the locking device due to vibrations during operation. As a result, a force accompanied by impact is repeatedly applied to the engaging portion 10b between the hook 10 and the lock receiver 4, which not only causes rapid wear and deformation of the engaging portion, but also damages the wall of the driver's cab body. This also affects the locking function, resulting in the locking function being impaired.

On the other hand, if the cushioning function of the cushion mechanism 5 deteriorates, even if the bundle 9 is operated in an attempt to release the locked state, there is no force to push out the door 3, and the door 3 does not move, so it will not be released automatically and will not be released separately. Manual operation is required.

In addition, as the cushioning function deteriorates, noise is emitted from the iron parts, which worsens the working environment for the driver.In addition, this device is separated from the lock receiver, cushion mechanism, hook device, etc., and is not a component. A lot of points.

This invention was created to solve the above problems.
The driver's cab door can be reliably locked in the open position, there is no risk of the lock coming off even if subjected to severe vibration or impact, and it can be easily unlocked by manual operation. It is an object of the present invention to provide a locking device having a simple structure, which has a function of automatically pushing away a driver's cab door in the direction of closing in response to a release operation, and has excellent durability.

In order to achieve the above-mentioned object, the present invention includes a case fixed to the outer wall of the driver's cab and provided with a groove for locking the above-mentioned lock holder, and a case that is rotatably supported with respect to the case and one end of the case. a hook having an operating lever at one end, a hook having a hook-shaped groove at the other end shaped to engage with a lock receiving fitting, and a spring having one end fixed to the case and the other end hooked to the hook,
In addition, the lock receiver is arranged such that the shaft for pivotally supporting the hook is on the line of motion of the metal fitting, and the shape of the hook-shaped groove is such that when the lock receiving metal fitting is fitted into the groove of the case, the lock receiver is arranged on the line of motion of the metal fitting. The lock holder cannot be rotated in the locking direction without contacting the metal fitting, and furthermore, when the lock holder fits into the groove bottom of the case, there is no play between the groove bottom and the lock holder. The hook has a shape that engages with the metal fitting, and is configured such that when the hook is rotated in the opposite direction to the locking direction by applying a manual operation force, the hook-shaped groove pushes out the lock receiving metal fitting. .

Next, an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

The lock holder 13 is fixed to the door 3 and moves in the direction of the arrow when the door is opened.

A case 15 is penetrated and fixed to the outer wall 14 of the driver's cab, and a groove 16 is formed in this case along the direction of movement of the lock holder 13, and the groove bottom 17 extends in the direction of the arrow of the lock holder. Movement is regulated.

The hook 18 is rotatably supported on the case 15 by a shaft 19 on an extension line of the movement direction of the lock receiving metal fitting.

On one side of this hook 18 is a bundle 2 for manual operation.
0 is integrally formed, and a hook-shaped groove 21 is formed on the opposite side.

The shape of the hook-shaped groove guide portion 22 is such that when the lock receiving fitting 13 moves in the direction of the arrow, it is pushed and moved, and the hook 18 is turned counterclockwise (hereinafter referred to as the locking direction for convenience of explanation). It has become so.

The shape of the locking portion 23 of the hook-shaped groove 21 is such that when the hook 18 rotates in the locking direction, the locking fitting 13 is assisted by a spring 24 (to be described later) to the groove bottom 17 of the groove provided in the case 15. and this locking portion 23.

In order to bias the hook 18, a torsion coil spring 24 is provided in this embodiment, one end of which is fixed to the case 15 and the other end is hooked to the hook 18.

This torsion coil spring 24 biases the hook 18 in the opposite locking direction when the hook 18 is rotated clockwise (hereinafter referred to as the locking direction) (see FIG. 3), and the hook 18 is rotated in the locking direction. In the rotated state, the hook 18 is biased in the locking direction (see FIG. 4).

25 is a stopper that restricts the rotation angle of the hook 18.

Since this embodiment is configured as described above, the hook 1
8 rotates in the locking direction, the locking portion 2 of the hook-shaped groove
3 presses the lock receiving fitting 13 in the direction of the arrow, and securely locks the lock receiving fitting 13 between it and the groove bottom 17 of the case 15.

The shape and dimensions of the two surfaces (groove bottom 17 and locking portion 23) that lock the lock receiving fitting 13 are set so that the play of the engaging portion is minimized.

Thereby, even if the door is subjected to vibrations or shocks, there is no risk that the lock will come off or the door will become unstable, and there is no risk that the locking member will be worn or deformed.

In this state, the torsion coil spring 24 biases the hook 8 in the locking direction (counterclockwise), so that this state is maintained (see FIG. 4).

In the state shown in FIG. 4 (locked state) described above, the pivot shaft 19 of the hook 18 is located on the line of motion (arrow E) of the lock receiver 13, so that the door 3 is No rotational force acts on the hook 18 even if it receives a strong external force in the direction.

Therefore, the locked state can be maintained very reliably.

That is, unless a manual operating force is applied to the bundle 20 of the hook 18 and the bundle 20 is turned in the unlocking direction (clockwise in the figure), there is no risk that the hook 18 will be turned by external force and come off.

In this way, the function of reliably maintaining the locked state of the hook 18 without additionally providing a separate locking device is achieved by the hook 18
One pivot shaft of the lock bracket 13 is moved along the line of motion (arrow,
E) is caused by being placed on top.

Furthermore, in the above-mentioned locked state, since the lock holder 13 is engaged with the groove 16 of the case 5, the outer wall 1 of the driver's cab
The vertical movement of the door 3 relative to the door 4 is restricted.

This prevents the door 3 from swinging or distorting in the vertical direction even if subjected to vibrations or shocks.

Next, in order to unlock the lock receiver 13 and close the door from this state, the bundle 20 is operated from inside the driver's cabin to move the hook 18 in the unlocking direction (clockwise).

Then, the locking part 23 of the hook-shaped groove of the hook engages with the lock receiving fitting 13.
At the same time, the guide portion 22 of the hook-shaped groove acts to push out the lock receiving fitting 13.

At the beginning of this operation, the bundle 20 must be rotated in the anti-locking direction against the biasing force of the torsion coil spring 24, but after the middle of the rotation, the biasing force of the torsion coil spring 24 is no longer engaged. It works to assist rotation in the direction of releasing the lock.

After the hook 18 is released from the lock holder 13 and pushed out, it is pressed against the stopper 25 by the biasing force of the torsion coil spring 24 in the opposite direction, and maintains this state to prepare for the next lock operation. (Figure 3).

As detailed above, the locking device of the present invention has a simple configuration, can reliably lock the driver's cab door in the open state, and there is no risk of the lock coming off even if subjected to severe vibrations or shocks. Moreover, it can be easily unlocked by manual operation, has the function of automatically pushing the driver's cab door away in the direction of closing when the above-mentioned release operation is performed, and has excellent durability. This has excellent practical effects.

[Brief explanation of the drawing]

1 and 2 show a conventional driver's cab door locking device, and FIG. 1 is an overall external view showing the installation position of the device;
FIG. 2 is a sectional view taken along line II-II in FIG. 3 and 4 show an embodiment of the present invention, with FIG. 3 being a cross-sectional view of the door in an unlocked state, and FIG. 4 being a cross-sectional view of the door in a locked state. 13...Lock bracket, 14...Outside wall of driver's cab, 15...Case, 16...Groove, 17...Groove bottom, 18... Hook, 1
9...Pivot axis, 20...Bundle, 2
1...Hook-shaped groove, 22...Hook-shaped groove guide part, 23...Hook-shaped groove locking part, 24...
・Torsion coil spring.

Claims (1)

[Scope of utility model registration request] In a locking device for a driver's cab door, the driver's cab door lock device includes a lock bracket fixed to a wall of the driver's cab door, and a means for engaging and locking the lock bracket when the door is opened on an outer wall of the driver's cab. A case fixed to an outdoor wall and provided with a groove that engages with the above-mentioned lock holder, and a case rotatably supported with respect to the case, having an operating lever at one end and a lock at the other end. A hook having a hook-shaped groove shaped to engage with a receiving metal fitting, and a spring having one end fixed to the case and the other end hooked to the hook are provided, and the shaft that pivotally supports the hook is locked into the receiving fitting. is arranged on the line of motion of the metal fitting, and the shape of the hook-shaped groove is such that when the lock receiving metal fitting fits into the groove of the case, it cannot rotate in the locking direction without coming into contact with the lock receiving metal fitting. The driver's cab is shaped so that it can be squeezed out, and the hook-shaped groove pushes out the lock receiver when the hook is rotated in the opposite direction to the locking direction by applying a manual operating force to the hook. Door locking device.