JPH0723342Y2 - Tilt stopper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a tilt stopper device.

(Prior Art) In a hydraulic cabling device in which a cab is tilted forward by an extension operation of a hydraulic cylinder, in order to ensure safety during cavitating, for example, as shown in FIG. Those equipped with a tilt stopper are proposed in Japanese Utility Model Laid-Open Nos. 60-20970 and 60-100280.

3 is a hydraulic cylinder interposed between the body frame and the cab, 1 is a stopper lever connected at one end to a piston rod 12 of the hydraulic cylinder 3, and the end face of the stopper lever 1 is provided with a large number of continuous cylinders along the cylinder 3. Teeth 2 are formed.
A lever guide 4 for slidably supporting the other end of the stopper lever 1 is fixed to the hydraulic cylinder 3, and a lock lever 6 having a tip hook portion 5 corresponding to the tooth 2 surface of the stopper lever 1 has a pin 6B. It is attached via rotation. The lock lever 6 is biased by a spring 11 interposed between the lock lever 6 and the lever guide 4 in a direction in which the hook portion 5 meshes with the teeth 2 of the stopper lever 1, that is, in a locking direction. Based on the shape, the stopper lever 1 is allowed to move upward, but the downward movement is restricted (locked). Then, the lock lever 6 is linked to the clevis 8 of the lock release wire 10 via the pin 13 at the rear end arm portion 7, and the wire 10 is resisted against the biasing force of the spring 11 by the lock release operation of the operation lever (not shown). When it is pulled, the hook portion 5 comes off the tooth 2 of the stopper lever 1.

(Problems to be solved by the invention) By the way, in such a tilt stopper device,
During the extension operation of the hydraulic cylinder 3 (that is, the tilt-up operation of the cab), when the stopper lever 1 moves upward together with the piston rod 12, the lock lever 6 swings as the arrow 2 in FIG. However, at that time, there is a concern that the pin 13 may not slide smoothly in the elongated hole 8A due to the resistance of the clevis 8 to the clevis or the edge may be caught, and the lock release wire 10 may be pressed and bent in the compression direction. Therefore, since the wire 10 having a relatively large diameter is used, there is a problem that the rigidity of the wire 10 itself is high and the wiring is not easy.

(Means for Solving the Problems) In order to solve such a problem, the present invention proposes, in a cavitating device in which a cab is tilted forward by an extending operation of a hydraulic cylinder, a large number of devices are connected along the hydraulic cylinder. One end of the stopper lever with teeth is connected to the piston rod, while the other end of the stopper lever with respect to the hydraulic cylinder is slidably supported in the expansion / contraction direction of the piston rod, and engages with the teeth of the stopper lever. The lock lever has a hook that regulates the contraction operation of the hydraulic cylinder, and is locked to the lock lever only when it is connected to the lock release wire and the lock release wire is pulled in the lock release direction. And a spring for urging the lock lever in the locking direction. Contacts the free end of the wire lever with the center of the bottom surface of the flat surface where the hooks are formed on both the left and right sides, and the center of rotation of the lock lever and the wire lever is coaxial with each other through a common pin. It will be installed in.

(Operation) The wire lever is separate from the lock lever, and the lock lever is integrally rotated only when the lock release wire is pulled in the lock release direction. In other words, the wire lever does not follow the lock lever when it swings by the teeth of the stopper lever as the hydraulic cylinder extends, so that the unlock wire does not receive a compressive force.

In addition, since the wire lever and the lock lever are coaxially supported, the structure is simple, and a portion that relatively moves when the wire lever comes into contact with the inside of the lock lever flat portion and operates integrally. It has good power transmission efficiency.

(Embodiment) In FIGS. 1 and 2, 20 is a hydraulic cylinder interposed between a vehicle body frame and a cab, 21 is a stopper lever connected to a piston rod 22 of the hydraulic cylinder 20 at one end, and 23 is a hydraulic cylinder 20. Attach the other end of the stopper lever 21 to the piston rod.
A lever guide that slidably supports the expansion and contraction direction of 22, and 24 by a spring 25 interposed between the lever guide 23 and
The direction in which the hook portion 26 meshes with the teeth 27 of the stopper lever 21,
That is, the lock lever is urged in the locking direction and allows the stopper lever 21 to move upward in this state based on the shape of the teeth 27 of the stopper lever 21, but restricts the downward movement.

The lock lever 24 has a flat portion 24 as shown in FIG.
A hook portion 26 is formed on both left and right sides of B, and a wire lever 28 is rotatably attached separately from the lock lever 24 on a pin 24A (rotating shaft portion) that supports the hook portion 26. The wire lever 28 has a clevis 30 with an unlock wire 29 at one end.
Only when the lock release wire 29 is pulled in the lock release direction, the other end of the lock lever 24 is connected to the lock lever 24.
Of the stopper lever 21 is brought into contact with the substantially central portion on the inner side of the flat portion of the stopper lever 21 in the unlocking direction, that is, the hook portion 26 is engaged with the tooth 27 of the stopper lever 21.
It is designed to be rotated in the direction away from. At this time, the lock lever 24 and the wire lever 28 share the common pin 24.
The lock lever 24 and the wire lever can be rotated coaxially about A as the center of rotation, thus simplifying the structure.
28 does not have a part that generates a mechanical friction due to relative movement when they rotate together as one, so even if the wiring of the wire 29 is complicated, it operates smoothly during the release operation. It is one that can be obtained. The lock lever 24 is provided with a cutout groove 32 for avoiding interference with the wire lever 28. Reference numeral 33 denotes a spring that biases the lock release wire 29 to the lock position via the wire lever 28.

With this configuration, when the hydraulic cylinder 20 is extended (the cab is tilted up), the stopper lever 21
The lock lever 24 swings as the teeth 27 get over when the piston moves with the piston rod 22, but the wire lever 28 does not follow the swing of the lock lever 24 and remains stopped. That is, the lock release wire 29 is prevented from being pressed and bent in the compression direction by the swing of the lock lever 24, and therefore the lock release wire 29 is not bent.
Since high rigidity is not required and the diameter of the wire 29 can be reduced, the unlocking wire 29 can be easily routed. In addition,
When the lock release wire 29 is pulled as described above during the contraction operation of the hydraulic cylinder 20 (tilt down operation of the cab), the lock lever 24 rotates together with the wire lever 28 and the hook portion 26 causes the teeth 27 of the stopper lever 21. Is released, that is, the tilt lock is released.

(Effects of the Invention) In short, according to the present invention, a wire that separates from the lock lever and locks the lock release wire in the lock release direction only when the lock release wire is pulled in the lock release direction. A lever is attached so that the lock release wire does not exert a compressive force on the lock release wire when the hydraulic cylinder is extended, so the lock release wire diameter can be reduced and wiring is easy. The effect of becoming is obtained.

Further, according to the present invention, since the lock lever and the wire lever are coaxially supported, the structure of the tilt lock mechanism can be simplified, and the wire diameter can be reduced and the cabling complicated therewith can be compensated. Also, the operation force at the time of the release operation can be reduced, and the operability can be improved.

[Brief description of drawings]

FIG. 1 is a partial side view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same main part, and FIG. 3 is a partial side view showing a prior art. 20 …… hydraulic cylinder, 21 …… stopper lever, 22 …… piston rod, 23 …… lever guide, 24 …… lock lever, 27 …… tooth, 28 …… wire lever, 29 …… unlock wire.

Claims (1)

[Scope of utility model registration request] 1. In a cavitating device in which a cab is tilted forward by an extension operation of a hydraulic cylinder, one end of a stopper lever having a large number of teeth connected along the hydraulic cylinder is connected to a piston rod, while the hydraulic cylinder is connected. A lever guide that slidably supports the other end of the stopper lever in the direction of expansion and contraction of the piston rod, and a lock lever that has a hook portion that engages with the teeth of the stopper lever and restricts the contraction operation of the hydraulic cylinder. A wire lever that is coupled to the lock release wire and that locks the lock release wire integrally with the lock lever only when the lock release wire is pulled in the lock release direction, and a spring that biases the lock lever in the lock direction. The lock lever is provided with a wire at the center of the bottom surface of the flat surface where hooks are formed on both left and right sides. Is brought into contact with the free end of the bar, tilt stopper device being characterized in that coaxially via a common pin the rotation center of the lock lever and the wire lever each.