JPS6315105Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking device for a tail cab.

Conventionally, a locking device for a tail cab that can be rotated and tilted around one end of the vehicle frame is a crank lever supported on the vehicle frame via a rod for operating the lock lever, as disclosed in Japanese Utility Model Publication No. 53-17048. (link) rotates, and the main hook supported by the crank lever moves toward the main hook pin fixed to the tail cab while being biased in the engagement direction by the spring of the auxiliary link and engages with the main hook pin. It was structured as follows.

In this invention, the movement trajectory of the main hook is almost determined by the rotating speed of the crank lever and the elastic force of the spring of the auxiliary link, so the movement of the main hook can be changed by handling the lock lever and changing the elastic constant of the spring. Even when the main hook is stuck, a guide device is provided to restrict the locking movement of the main hook to a predetermined trajectory, so that the main hook can more reliably engage with the main hook pin.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, one end of the rod 1 is connected to a lock lever (not shown), and the other end is approximately L.
One end of the letter-shaped link 2 is rotatably connected, and the other end of the link 2 is supported by a main hook bracket 3 fixed to the tail cab, and a main hook 5 with an engaging pawl 4 at the tip is provided in the center thereof.
supports. One end of an auxiliary link 6 for biasing the main hook 5 in the locking direction by a locking operation is supported at the intermediate portion of the main hook 5, and the other end is supported by the main hook bracket 3 via a pin 7 to be described later. The auxiliary link 6 includes a rod 10 into which a pin 7 freely rotatably installed on the main hook bracket 3 is loosely fitted, a stopper 8 and a spring support plate 9, and a rod 10 that is inserted inside to connect the pin 7 and the spring. Spring 1 interposed between support plate 9
1. As a result, auxiliary link 6
is arranged so that the rod-like member 10 is rotated clockwise about the pin 7 and moved upward in FIG. 1 by the locking operation. The main hook 5 and the main hook bracket 3 are provided with a guide device that restrains the locking movement of the main hook 5 by a locking operation to a predetermined trajectory. It doesn't matter if it is free to move (for example, if it is free to rotate, it will cause rolling friction and the locking operation resistance will be smaller than if it is fixed), and the main hook bracket 3 has an engaging pin 12.
A guide wall 13 is formed which engages with the guide wall 13 . On the other hand, a main hook pin 15 is fixed to the vehicle frame 14 with which the main hook 5 is engaged by a locking operation to lock the tail cab.

In such a configuration, when a lock lever (not shown) is operated, the link 2 rotates counterclockwise via the rod 1 about the support portion a as a fulcrum as shown by the two-dot chain line, and the main hook 5 moves upward at the same time. As a result, the engagement pin 12 comes into contact with the guide wall 13, and the spring 11 of the auxiliary link 6 is compressed. As the rotation angle of the link 2 increases in the counterclockwise direction, the main hook 5 is rotated by the engagement pin 12 of the link 2.
is rotated clockwise about the support part b by the compressive force of the spring 11 of the auxiliary link 6, and as a result, it draws a predetermined movement locus of movement to the left along the guide wall 13 and engages with the main hook pin 15. do.

Therefore, even if the lock lever is operated roughly and the rotational speed of the link 2 increases, or even if the elastic constant of the spring 11 of the auxiliary link 6 decreases due to deterioration, the locking movement of the main hook 5 will always engage with the guide wall 13. The engagement with the pin 12 creates a predetermined trajectory, resulting in stable locking operation.
It can be locked more reliably.

On the other hand, to release the lock, when the lock lever is returned to its original position, the link 2 rotates clockwise via the rod 1, and the main hook 5 is moved to the auxiliary link 6.
This is easy because the stopper 8 moves downward until it comes into contact with the pin 7 and rotates counterclockwise around the support part b by its own weight as a fulcrum.

In the above embodiment, the main hook 5 is provided with an engaging pin 12 as a guide device for the main hook 5, and the main hook bracket 3 is provided with a guide wall 13. A configuration in which a dowel pin is provided may be used, and a groove that engages with an engagement pin may be used instead of the guide wall.

Further, in the above embodiment, the link 2 and the main hook 5 are attached to the tail cab side, and the main hook pin 15 is attached to the vehicle frame 14, but the link and the main hook are attached to the vehicle frame side, and the main hook pin is attached to the tail cab side. good.

As explained above, according to the present invention, a guide device is provided that locks the main hook along a motion trajectory determined by the spring elastic force of the auxiliary link and the link, and restrains the locking movement of the main hook to a predetermined trajectory. Because of this structure, a stable locking operation is always performed regardless of the operation status of the lock lever, and the advantage is that the locking operation can be performed more reliably than the conventional example.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a locking device for a tail cab, which is an embodiment of the present invention, and FIG. 2 is a view of the same device in the direction of arrow A. 1... Rod, 2... Link, 3... Main hook bracket, 5... Main hook, 6... Auxiliary link, 12... Engagement pin, 13... Guide wall,
14...Car frame, 15...Main hook pin.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a locking device for a tail cab that tail-locks a tail cab mounted on a vehicle body so as to be tiltable and rotatable and the vehicle body by engagement between a main hook and a main hook pin, The end of the main hook is supported freely in the middle of an L-shaped link that is freely supported and rotated around the support by a locking operation, and the pin is freely rotated in the main hook bracket. Attaching one end of the main hook to one end of an auxiliary link that stands upright on the main hook and biasing the main hook in a direction to engage the main hook pin by a locking operation, and attaching the other end of the auxiliary link to the pin; An auxiliary link is interposed between a rod-shaped member whose one end is attached to the main hook and whose other end is movably loosely fitted to the pin, and a stopper member attached to the pin and one end of the rod-shaped member. What is claimed is: 1. A locking device for a tailed cab, comprising: an externally inserted spring member; (2) Utility model registration claim 1, characterized in that the guide device consists of an engaging pin embedded in the main hook and a guide wall that engages with the engaging pin.
The locking device for the tail cab described in Section 1.