JPH0113015Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a locking mechanism for a tilt cab in a cab-over type vehicle.

[Prior Art] In the tilt cab lock mechanism disclosed in Japanese Patent Publication No. 46-127, a hook supported on an operating lever on the vehicle frame is engaged with an eye bolt supported on the bottom of the cab via a buffer, and the locking mechanism is operated. By pushing down on the lever, the cab is strongly pressed against the vehicle frame via the buffer. However, with this configuration, if the cushioning material, such as rubber, interposed between the cab and the car frame wears out over a long period of use, the force that presses the cab against the car frame will weaken, and the gap between the hook and the eye bolt will weaken. There is also the problem that there is a problem in that the quality is likely to vary due to the fact that it is difficult to keep the set load constant, and it is difficult to maintain a constant set load.

If a spring is used instead of a shock absorber, a strong engagement force can be obtained between the hook and the eyebolt, but if the eyebolt comes off the hook when tilting the cab, a large reaction force will be applied to the control lever. There is a risk that the worker may be hit by the control lever.

[Problems to be solved by the invention] The purpose of the invention is to provide sufficient engagement force between the jack provided on the vehicle frame and the hook provided on the cab in the locking position of the cab, so that when the lock is released, To provide a tilt cab locking mechanism with excellent operability and suppressing reaction force applied to an operating lever.

[Means for Solving the Problem] In order to achieve the above object, the structure of the present invention is such that a rod supporting the jyo is vertically movably supported on a pedestal fixed on the vehicle frame, and a claw that engages with the jyo to pull it up is provided. A hook having a rod is rotatably supported on the cab, a spring is interposed between the lower surface of the pedestal and a spring seat connected to the lower end of the rod, and a buffering elastic body is provided between the spring seat and the vehicle frame. It is an intervention.

[Function] When the spring 29, which was applying the elastic engagement force to the jaw 21 with the hook 18, comes off from the hook 18 when the locking mechanism of the cab 6 is released, the buffering elastic body 30 absorbs the restoring force of the spring 29. The rotational reaction force transmitted from the hook 18 to the operating lever 2 is reduced.

When the cab 6 is tilted, the damping elastic body 30 applies an initial load to the spring 29, reducing the operating force required to lock the cab 6 into position.

[Embodiment of the invention] As shown in FIG. 1, a pair of left and right pedestals 25 are fixed to the vehicle frame 24 in order to support the rear end portion of the cab 6 on the vehicle frame 24. The pedestal 25 has an elongated box shape extending in the front-rear direction, and has a roof-shaped slope 25 at the upper end.
a (Fig. 2) is provided.

The jaw 21 supported on the pedestal 25 has a pair of front and rear rods 2 supported on the pedestal 25 so as to be slidable in the vertical direction.
It has 2. A roller 23 is rotatably supported on a shaft extending over the upper ends of the pair of rods 22.
The lower half of each rod 22 has a stepped portion 22a (FIG. 6).
The diameter becomes small from this point, and this small diameter portion is penetrated and supported by the pedestal 25. A spring 29 is interposed between the inner surface of the base 25 and a spring 28 fixedly supported on the lower end of the rod 22. In order to apply an initial load to the spring 29, a buffering elastic body 30 made of cylindrical rubber or the like and having a small amount of deformation is interposed between the spring seat 28 and the vehicle frame 24.

A pair of box-shaped legs 15 on the left and right sides of the rear bottom of the cab 6
is fixed. As shown in FIG. 2, the leg 15 is provided with a slope 15a that engages with a slope 25a of the base 25, and a pair of vertical walls 15b extending upward from the slope 15a. A hook 18 that crosses a slit provided in a pair of vertical walls 15b is attached to a leg 15 by a support shaft 14.
is rotatably supported.

The roughly L-shaped hook 18 is provided with a claw 18a on one end that engages with the roller 23 described above.
The roller 17 is supported on the other end side having the edge 18b. To operate the hook 18, press the hook 18.
A pair of arms 10 are rotatably supported inside the legs 15 by a support shaft 12 so as to sandwich the legs 15 from both front and rear sides. One of the arms 10 has a shortened end 10a, and the other arm 10 is connected to the link 9 by a pin 8. A roller 13 is supported between the pair of arms 10 and is configured to be able to engage with the edge 18b of the hook 18 described above.

As shown in FIG. 1, the hook 18 has an edge 18b.
have different shapes on the left and right sides, the maximum point of force for rotating the arm 10 is shifted between the left and right sides, and the peak of the operating force applied to the operating lever 2 is alleviated.

The left and right pairs of legs 15 have substantially the same configuration.
The left and right arms 10 are connected to each other by a link 9. The upper end of the left arm 10 is curved and extended to the left, and one end of the link 5, which can be expanded and contracted, is connected to the end of the arm 10 by a pin 7. The other end of the link 5 is connected to the intermediate portion of the operating lever 2 by a pin 4. The operating lever 2 is supported by a support shaft 3 at the bottom of the cab 6. With the cab 6 locked in place as shown in FIG. 1, the tip of the operating lever 2 is fixed to the cab 5 or the vehicle frame 24 by a suitable means such as a pin.

Next, the operation of the tilt cab locking mechanism according to the present invention will be explained. When the lock mechanism of the tilt cab is released to tilt the cab 6 and the leg 15 is separated from the pedestal 25, the arm 10 tilts to the left about the support shaft 12 and the hook 18 The claw 18a retreats to the right from between the pair of vertical walls 15b, and the edge 18b abuts on the support shaft 12.

In the jaw 21, the rod 22 is pushed down by the force of the spring 29, and the stepped portion 22a (FIG. 6) is pushed down to the pedestal 25.
is abutted against the top wall of the At this time, the elastic body 30 is bent in a drum shape.

When the cab 6 is pushed down from the tilted state to lock it in the normal position, the hook 18 first hits the roller 23 of the jaw 21 and is rotated clockwise about the support shaft 14, as shown in FIG. Fourth
As shown in the figure, as the hook 18 rotates, the claw 1
8a projects downwardly and engages with the roller 23 supported by the rod 22, and at the same time the slope 15a of the leg 15 rests on the slope 25a of the base 25. Operation lever 2
When the arm 10 is rotated counterclockwise around the support shaft 3 to the state shown in FIG. 1, the arm 10 is sequentially rotated clockwise around the support shaft 12 as shown in FIGS. 5 and 6. , roller 13 of arm 10 is hook 1
8, and the hook 18 is further sequentially rotated clockwise about the support shaft 14.
Therefore, the claw 18a moves upward and the roller 2
3 is pulled up against the force of the spring 29. In this way, the spring 29 applies an engagement force between the jaw 21 and the hook 18.

Next, when releasing the tilt cab lock mechanism from the locked state shown in FIG.
rotates clockwise around the support shaft 3. The left arm 10 is rotated counterclockwise about the support shaft 12 via the link 5, and the right arm 10 is also rotated counterclockwise about the support shaft 12 via the link 9. At this time, due to the force of spring 29, Jiyo 2
The claw 18a that engages with the first roller 23 is pulled down, and the hook 18 is rotated counterclockwise about the support shaft 14. Rotation of the hook 18 in the counterclockwise direction is restricted by the roller 13 of the arm 10.

From the roller 13 of the arm 10 to the edge 18 of the hook 18
At the moment b comes off, the hook 18 is released by the force of the spring 29.
is strongly rotated counterclockwise about the support shaft 14. At the same time, a counterclockwise rotational reaction force about the support shaft 12 acts on the arm 10. However, in the present invention, when the hook 18 comes off the roller 13, the spring 2
Since the instantaneous force 9 is absorbed by the deflection of the elastic force 30, the rotational reaction force acting on the arm 10 is kept small. The danger of the operator being hit by the operating lever 2 being suddenly flipped up is eliminated.

Furthermore, when the lock is operated, the reaction force due to the bending of the elastic body 30 acts to rotate the hook 18 clockwise, so the operating force exerted by the operating lever 2, especially the operating force at the initial stage of operation, is alleviated, improving operability. be done.

If an attempt is made to return the operating lever 2 to the locked state by mistake while the cab 6 is tilted, the arm 10 will hit the roller 17 of the hook 18, which will prevent the operating lever 2 from being locked.

An initial load is applied to the spring 29, and in the engaged state shown in FIG. 1, the elastic body 30 returns to its almost natural shape, so that it can withstand long-term use.

[Effects of the invention] As described above, the present invention supports a lock that supports the jyo on a pedestal fixed on the vehicle frame so that it can move up and down, and a hook that has a claw that engages with and pulls up the jyo can be rotated around the cab. A spring is interposed between the lower surface of the pedestal and a spring seat connected to the lower end of the rod, and a buffering elastic body is interposed between the spring seat and the vehicle frame, and the lock mechanism is released. When the spring that applied the elastic engagement force to the hook comes off the hook, the restoring force of the spring is suppressed by the buffering elastic body, so the rotational reaction force acting on the operating lever from the hook is greatly reduced. This prevents danger to the operator due to the operating lever jumping up.

Further, when the cab is tilted, an initial load is applied to the spring by the buffering elastic body, so that the operating force required to lock the cab in a fixed position is reduced.

[Brief explanation of the drawing]

Figure 1 is a front sectional view of the tilt cab locking mechanism according to the present invention, Figure 2 is a front sectional view showing the right half of the tilt cab locking mechanism in the released state, and Figures 3 to 6 are from the released state to the locked state. FIG. 3 is a front sectional view showing the right half of the tilt cab locking mechanism for explaining the operation thereof. 6: Cab, 10: Arm, 12, 14: Support shaft, 1
3, 23: Roller, 15: Leg, 18: Hook, 1
8a: Nail, 21: Jiyo, 22: Rod, 24:
Vehicle frame, 25: pedestal, 28: spring seat, 29: spring,
30: Buffer elastic body.

Claims (1)

[Scope of utility model registration request] A rod supporting the jig is supported vertically movably on a pedestal fixed to the vehicle frame, and a hook having a claw that engages with and pulls up the jyo is rotatably supported on the cab, and the lower surface of the pedestal and the lower end of the rod are supported rotatably on the cab. A locking mechanism for a tilt cab, characterized in that a spring is interposed between a spring seat coupled to a spring seat, and a buffering elastic body is interposed between the spring seat and a vehicle frame.