JPS632369Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tilt stopper device.

The maximum tilt angle of the cab of a cab-over type vehicle is generally set at around 50 degrees due to the size of the inspection building and the load placed on the cab and chassis front structure. Therefore, when the cab is tilted, a downward moment is applied to the cab.In contrast, the hydraulic cylinder for tilting the cab is of the oil lock type, which means that when the hydraulic cylinder stops operating, the hydraulic cylinder It is required that no oil inflow or discharge occurs. This is based on the premise that the hydraulic system is completely oil-tight. However, for various reasons, fine particles mixed into the oil may impair the oil tightness and cause the cab to descend onto the worker's head, so mechanical safety devices other than the oil lock mentioned above are required. Needed.

On the other hand, as an example, in Japanese Patent Application Laid-Open No. 57-77273, teeth on a stopper lever whose upper end is pin-connected to the cab and is provided with a plurality of teeth are used as a cab-side element, and a cylinder part of a cylinder device for tilting the cab. A stopper device is constructed by using the stopper lever as an element on the side of the chassis frame to prevent the cab from descending when the oil lock is damaged, and the teeth of the stopper lever are given a shape that allows the cab to tilt up while allowing the stopper lever to escape outward. An operating device is disclosed which rotates the stopper lever and brings the stopper device into a non-operating state.

However, in this device, the connection point of the tilt cylinder device to the cab side and the connection point of the stopper lever to the cab side are separate, so when tilting down, the tilt cylinder device is moved to the down side without releasing the lock of the stopper lever. When activated, a couple is generated between each connection point. Therefore,
These connection points must be reinforced, which increases weight and cost, and is disadvantageous in terms of space.

In response to this, the present applicant previously proposed in Utility Application No. 58-42111 a tilt stopper device in which the connection points of the hydraulic cylinder and the stopper lever on the cab side are made the same, so that no couple is generated at the connection point. There is.

By the way, in this device, a push plate attached to the lock lever is installed in a part of the hydraulic cylinder to stop the motor that is driving when the hydraulic cylinder is at full stroke, that is, at maximum tilt, and to confirm the lock in that state. An electric circuit is provided to press a micro switch. Therefore, if there is no failure in this electric circuit, the locked state at the full stroke of the hydraulic cylinder, that is, at the maximum tilt, can be electrically detected. However, it is impossible to confirm the locked state when the electric circuit breaks down or during tilting.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tilt lock device in which the status of any lock can be visually confirmed.

This purpose is to provide a hydraulic tilt vehicle in which the cab is tilted by a hydraulic cylinder.
A plurality of teeth are formed on a stopper lever that is swingably connected to a point that coincides with a connection point on the cab side of the hydraulic cylinder, and a plurality of teeth are formed on an element that is connected to the frame side of the hydraulic cylinder so as to be able to rotate. A lock lever that engages to prevent the cab from tilting down is installed, and the hydraulic cylinder is provided with a guide that always holds the stop lever in a position where it can be engaged with the lock lever, and the lock lever engages with the teeth of the stop lever. This is achieved by providing a spring means for causing the stopper lever to move and a disengaging means for releasing the engagement, and a mark indicating the state of engagement with the stopper lever. Therefore, according to the present invention, by visually observing the mark attached to the lock lever, it is possible to confirm whether the lock is in the locked state or the unlocked state at maximum tilt or in the middle of tilt.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 12.

In FIGS. 1 to 4, a cab 1 is rotatably supported around a tilt center 3 of a chassis frame 2, and a hydraulic cylinder 5 of a hydraulic cylinder device 4 is interposed between the two. . A roast motion lever 17 supported by the cab side connection point of the hydraulic cylinder 5, that is, the bracket 8a.
A stopper lever 6 is swingably connected to a pin shaft 7a provided on the body of the hydraulic cylinder 5 by a bracket 18, and a guide 19 provided on the body of the hydraulic cylinder 5
is inserted into the hydraulic cylinder 5 and held parallel to the axis of the hydraulic cylinder 5. On the other hand, a plurality of teeth 9 are formed on the guide 19 side.

This guide 19 has teeth 9 of the stopper lever 6.
A long hole 20 is bored in the side, and a lock lever 21 that passes through this long hole 20 and engages with the teeth 9 is supported by a lock lever pin 22 and is engaged with the stopper lever 6 by a lock lever set spring 23. energized.

On the other hand, a release lever pin 24 is provided on the guide 19 in parallel with the lock lever pin 22, and pivotally supports an engagement release means, that is, a release lever 25.

The release lever 25 engages with a pin 26 provided on the lock lever 21 to release the lock lever 21.
A cam surface 25a is formed so that the lock lever 21 can be rotated from the lock position to the release position.
The tip hole 25b is biased toward the non-actuating side.
A release wire 28 that extends to the handle 13 is connected to the handle 13 .

Further, the guide 19 is provided with a micro switch 29 and a corresponding push plate 30 on the lock lever 21, so that the full stroke of the hydraulic cylinder 5 and the locking of the lock lever can be detected.

As shown in FIG. 5, the lock lever 21 includes:
A mark S is provided by painting the diagonally shaded portion where the tip of the lock lever 21 is hidden in the elongated hole 20 of the guide 19 in the locked state during the tilt, which will be described later. It is desirable to use luminous paint for this mark S so that it can be visually confirmed even at night.

The form of the mark S is not limited to the one that allows the lock state to be confirmed when the lock is partially locked as shown in FIG. 5. As shown in FIG. , that is, when the lock lever 21 is in the unlocked state, the mark S ₁ indicates the boundary where the lock lever 21 is hidden in the elongated hole 20 of the guide 19, and when the lock lever 21 is engaged, that is, the mark S ₂ indicates the boundary when the lock lever 21 is in the locked state in the middle of tilting, and the hydraulic pressure. The marks _S3 indicating the boundaries of the locked state at the full stroke of the cylinder 5, that is, at the maximum tilt, may be painted in red, yellow, and blue, respectively.

Next, the operation will be explained with reference to FIGS. 7 to 9.

When tilting, as shown in FIG.
Since the lower end 21' of the lock lever 21 is sloped, when the stopper lever 6 moves upward in the direction of the arrow A, the lock lever 21 is rotated in the direction of the arrow B without interfering with the upward movement.

Next, when the hydraulic cylinder 5 is at full stroke, that is, at maximum tilt, a lock lever 21 enters the lower part of the stopper lever 6 to prevent the cab from descending, as shown in FIG. In this case, the lock lever 2
As shown in the figure, the position of the tip of the lock lever 21 differs by a height h, and the rotation angle of the lock lever 21 is correspondingly large. The difference in angle is measured between the micro switch 29 and the push plate 3.
0, and the hydraulic pump (not shown) that pumps oil to the hydraulic cylinder 5 is stopped.

To release the lock, pull the release wire 28 and release the release lever 25 as shown in FIG.
When the lock lever 21 is rotated, the pin 26 of the lock lever 21 is pushed up by the cam surface 25a, and the lock lever 21 is rotated to a non-operating position and disengaged from the teeth 9. At this time, the push plate 30 of the lock lever 21 is detached from the micro switch 29, so that the hydraulic pump can be operated and tilted down.

By the way, in this device, as shown in FIG. 10 in the unlocked state, most of the mark S of the lock lever 21 is exposed from the outside 19a of the guide 19, that is, from the opening edge of the elongated hole 20.
This condition can be confirmed visually.

On the other hand, as shown in FIG. 11, the locked state during the middle of the tilt is such that the mark S is aligned with the outer side 19a of the upper edge guide 19, so this state can be confirmed visually.

In addition, in the locked state at the maximum tilt, as shown in Fig. 12, the mark S is completely hidden by the long hole 20, so this state can be confirmed visually. Therefore, even if the microswitch 29 of the electric circuit breaks down, any locked state can be confirmed visually by checking the mark S.

As explained above, according to the present invention, a mark indicating the engaged state is attached to the lock lever that engages with the teeth of the stopper lever, so that the lock state can be confirmed by the appearance of the mark.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention, Figures 1 and 2 are side views, Figure 3 is a front view, Figure 4 is a perspective view of main parts, and Figure 5 is a mark. Fig. 6 is a diagram showing another embodiment of the mark, Figs. 7 to 9 show the operating states of the lock lever of this embodiment, Fig. 7 is in the middle of tilting, Fig. 8 is at maximum 9 is a side view when the lock is released, FIGS. 10 to 12 are views showing the state of the marks on the lock lever of this embodiment, and FIG. 10 is a view showing the state when the lock is unlocked. FIG. 11 is a diagram showing the locked state in the middle of tilting, and FIG. 12 is a side view of the locked state at maximum tilt. 1... Cab, 5... Hydraulic cylinder, 6... Stopper lever, 9... Teeth, 19... Guide, 21
... Lock lever, 25 ... Release lever, 25a
...Cam surface, 29...Micro switch, 30...
...Press plate, S... mark.

Claims (1)

[Scope of utility model registration request] In a hydraulic tilt vehicle in which the cab is tilted by a hydraulic cylinder, a plurality of teeth are formed on a stopper lever that is swingably connected to a point that coincides with a connection point on the cab side of the hydraulic cylinder. A lock lever is attached to an element connected to the frame side so as to be rotatable and engages with the teeth of the stopper lever to prevent the cab from tilting down, and the stopper lever is always placed in a position where it can be engaged with the lock lever on the hydraulic cylinder. The lock lever is provided with a guide for holding the lock lever, and the lock lever is provided with a spring means for engaging with the teeth of the stopper lever and an engagement release means for releasing the engagement, and is further provided with a mark indicating the state of engagement with the stopper lever. Tilt stopper device.