JP2581325Y2 - Locking device for platform tilt - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a locking device for fixing a truck bed tilt in a closed state.
The present invention relates to a lock device that is particularly suitable for automatically opening and closing a tilt.

[0002]

2. Description of the Related Art As a lock mechanism for a loading platform tilt, a sliding plate that moves up and down along columns positioned at both left and right ends of the tilt locks and locks the retreat of a locking plate protruding from a side edge of the tilt. It has been known. In this type of conventional structure, a slide plate that moves up and down by a lever operation or the like is provided inside a hollow pillar, and a part of the pillar is cut away to open the locking plate that has entered the pillar from the opening provided. The slide plate is raised and closed.

Further, in recent trucks, especially large trucks, a structure in which the tilt is opened and closed by hydraulic pressure or electric motor drive has been put into practical use due to demands for labor saving and improvement of the driver's working environment. In a truck provided with such a tilt opening / closing drive device, after loading is completed, the driver closes the tilt by a button operation or the like, and then locks both ends of the tilt by a manual operation.

The opening / closing drive device is usually provided at the center of the tilt, and when the tilt is closed, the opening / closing mechanism must not protrude outward. As a consequence, it is not possible to completely close both ends of the tilt when the opening / closing drive closes the tilt. That is, in the case where the lock mechanism having the above-described structure is used, when the tilt is closed by the opening / closing drive mechanism, the locking plate 3 provided on the tilt is located closer to the closed position a shown by the imaginary line in FIG. Position). Then, after closing the tilt with the opening / closing drive, the worker pushes the end of the tilt to push the locking plate 3 into the closed position a, and then advances the slide plate 5 to fix the tilt. Was.

[0005]

In the case of the conventional means as described above, after the driver closes the tilt by a button operation or the like, in order to lock both ends of the tilt, from the front end to the rear end of the carrier. I have to move and do work,
Labor saving and improvement in work efficiency were not sufficiently achieved. Therefore, after the tilt is closed, there is a demand to operate the lock mechanism automatically. However, in the lock device having the conventional structure described above, even if a driving device for moving the slide plate 5 up and down is provided, the locking plate 3 Cannot reach the closed position a, the slide plate 5 cannot be lifted, and it is necessary to add a mechanism for pushing both ends of the tilt to the normal closed position a before operating the slide plate 5. There is a problem that the locking device becomes complicated.

[0006] In some cases, the upper end of the slide plate 5 is formed as an inclined surface 21 as shown in FIG. 1 so that the slide plate 5 can be advanced even if the locking plate 3 is slightly raised. Since the allowable lifting amount cannot be made so large, it is impossible to automate the locking of the tilt by this structure.

The present invention has been made in view of the above problems, and has as its object to obtain a lock mechanism suitable for automatically locking a tilt in a closed state.

[0008]

According to the present invention, a swing plate 9 swinging toward a closed position a of the locking plate 3 is provided in conjunction with the advance operation of the slide plate 5, and the slide plate 5 is locked. The rocking plate 9 is located between the slide plate 5 and the locking plate 3, and when the slide plate 5 is retracted, the rocking plate 9 deviates from the movement locus of the locking plate 3. The above problem is solved by providing the rocking plate 9 pivotally attached to the column 1 so as to retreat to the position.

[0009]

In the lock device having the above structure, after the tilt is closed by the opening / closing drive device, the slide plate 5 is advanced by the driving force of the opening / closing drive device or by a separately provided hydraulic or electric drive device. 9 swings in the closing direction and pushes the rear surface of the locking plate 3 floating from the closed position a. As the slide plate 5 advances, the force with which the rocking plate 9 pushes the locking plate 3 increases. Specifically, the locking plate 3 is pushed into the closed position a via the rocking plate 9 with a large force by the wedge action,
Thereafter, the slide plate 5 reaches the advancing end and the movement of the swing plate 9 in the opening direction is fixed, so that the tilt can be locked in a completely closed state.

In a state immediately after the tilt is closed by the opening / closing drive device, the slide plate 5 is in the retracted position, and at this time, the swinging plate 9 swings largely in the opening direction. Even if the part is lifted from its normal closed position by a considerable amount, it is possible to increase the length of the rocking plate 9 so that the sliding plate 5 can be reliably pushed in when it advances. When the tilt is opened, if the slide plate 5 is retracted, the swinging plate 9 automatically opens and retracts from the movement locus of the locking plate 3.
There is no problem in automating the tilt opening operation.

That is, according to the lock device of the present invention,
Closed position a only by the operation to advance the slide plate 5
Pushing the end of the tilt up from above into the closed position a and then blocking the retreat of the locking plate 3 is performed, so that the locking operation linked to the opening and closing of the tilt can be easily automated. Becomes

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an embodiment of the present invention. FIG. 1 is a sectional side view showing a state immediately before locking, FIG. 2 is a sectional side view showing a locked state, and FIG. It is. A pillar 1 having a cross section formed in a square pipe shape is provided upright at four corners of a loading bed of a truck (not shown). Is protruding. The post 1 is provided with an opening 4 through which the locking plate 3 passes when the tilt 2 is rotated. When the tilt 2 is completely closed, the locking plate 3 is accommodated in the column 1.

A U-shaped slide plate 5 is fitted in the column 1 so as to be slidable up and down. The slide plate 5 has a lock bar 6 serving as a strength member for receiving a locking force and a strip-shaped push plate. The material 7 is fixed. The slide plate 5 is connected to a drive mechanism (not shown) at the lower end of the column 1 and is driven up and down. In the column 1 at the lower end of the opening 4, a pin 8 parallel to the pivot of the tilt 2 is rotatably supported by a bracket fixed to the column 1, and is bent to the side of the side of the pin 8 in a rectangular shape. The base end of the rocking plate 9 is welded. The rocking plate 9 is bent so that the tip side faces inward, and the pin 8 is
It is pivotally supported on the back side. Therefore, the swinging plate 9 rotates downward by its own weight, stops by contacting the lower edge of the opening 4 or the upper edge of the pressing member 7 at the lowered position, and stops the slide plate stopper 1.
0 holds that posture. In this state, the tip of the swing plate 9 is located at a position retracted downward from the movement trajectory of the locking plate 3 when the tilt 2 swings.

When the tilt 2 is closed when the slide plate 5 is at the retracted position, the locking plate 3 projecting to the side of the tilt 2 passes above the swing plate 9 at the open position. Move inside it. At this time, the locking plate 3 is lifted up by x from its completely closed position a due to the above-mentioned twisting of the tilt, for example, comes to a position shown by a solid line in FIG. When the slide plate 5 is raised in this state, the front end of the pressing member 7 contacts the back surface of the swinging plate 9 and rotates upward, and the front end of the pressing member 7 Contact the lower end of the outer surface.
When the slide plate 5 is further raised, the rocking plate 9 is further rotated upward, and the locking plate 3 is moved along with this rotation operation to the column 1.
Push it in. As the rocking plate 9 rotates upward, the angle between the sliding plate 5 and the moving direction of the sliding plate 5 becomes smaller, and the pushing force of the sliding plate 5 is enlarged by the wedge action to rotate the rocking plate 9 inward. As a result, the slide plate 5 passes through the space between the rocking plate 9 and the front wall of the column, and then the slide plate 5 shown in FIG.
The advancing end shown in is reached. At the forward end, the tip of the lock bar 6 moves up to a position beyond the upper edge of the opening 4 so that the upper and lower ends are supported by the front wall of the column 1, and the slide plate 5 is
Then, the retreat of the locking plate 3 is closed via the swinging plate 9 to lock the tilt 2 and maintain this locked state.

To open the tilt, if the slide plate 5 is moved downward, the swinging plate 9 is rotated downward by its own weight, and is further pushed by the descending stopper 10 to be opened to move the moving path of the locking plate 3. The tilt 2 can be opened in this state. In the cross-sectional structure of the tilt 2 and the column 1 shown in FIG. 3, the end of the tilt and the L-shaped members 11 and 12 protruding from the column 1 prevent rainwater from entering between the column 1 and the tilt 2. FIG. 3 shows that the locking plate 3 is fixed to the inner panel 15 of the tilt 2 by bolts 13 and rivets 14.

[0016]

According to the locking device of the present invention described above, after the rocking plate that rotates inward in conjunction with the upward movement of the locking member pushes the end of the tilt into the proper closed position, Since the lock member is advanced so as to block the retreat of the tilt locking plate, even when the end of the tilt is considerably raised from its normal closing position, the tilt is completely closed only by the advance operation of the lock member. Since the lock can be performed in the locked state, the tilt lock can be easily automated, and all the opening and closing operations of the tilt including the lock operation can be mechanized to save labor and shorten the working time.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a state immediately before locking according to an embodiment.

FIG. 2 is a sectional side view of a locked state of the embodiment.

FIG. 3 is a cross-sectional plan view of the embodiment viewed from below.

[Explanation of symbols]

 1 pillar 3 locking plate 4 opening 5 slide plate 9 rocking plate a closed position

────────────────────────────────────────────────── ─── Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B62D 33/02-33/037

Claims (1)

(57) [Scope of request for utility model registration] An opening formed by cutting out a part of a pillar (1).
(4) In the locking device of the platform tilt that closes the slide plate (5) by moving the slide plate (5) out of the locking plate (3) that has entered the pillar from the (4), it is engaged in conjunction with the slide plate (5) advance operation. Stop plate
A swing plate (9) that swings toward the closed position (a) of (3) is provided, and when the slide plate (5) advances to the locked state, the swing plate (9) moves to the slide plate (5). So that when the slide plate (5) is retracted, the rocking plate (9) retreats to a position outside the movement trajectory of the latch plate (3). A rocking device for rocking the platform, in which the rocking plate (9) is pivoted to the column (1).