JP2000272550A - Operation lever device for tilt cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation lever device for a tilt cab operated easily by one lever. SOLUTION: A main lever 5 of a plate-shaped body is pivoted turnably on a base panel 1, the main lever 5 is equiped with a pin 24 engaged with a cam 23 provided in a selector valve stem for switching a hydraulic circuit of a tilt cylinder, cam parts 11, 13 engaged with a locker arm 15 for turning a start switch 19 on and off, and an operation handle 7, and a pull lever 25 for pulling a release wire is engaged with the operation handle 7 to be turned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an operation lever device for operating a tilt cab having a tilt lock device for locking a tilt cylinder.

[0002]

2. Description of the Related Art Hydraulically operated tilt cylinders,
2. Description of the Related Art There is known an operation lever device for operating a lifting and lowering of a tilt cab provided with a tilt lock device so that the cab does not fall accidentally when the cab is tilted up or down (for example, see Japanese Utility Model Publication No. 6-5969). ).

[0003] However, in the above technique, when the cab is raised and lowered, a first lever for operating a switching valve for switching a hydraulic circuit from an oil pump to a hydraulic cylinder (tilt cylinder) between a tilt-up side and a tilt-down side is electrically driven. It is necessary to operate two levers, a start switch for starting the pump and a second lever for releasing the tilt lock device. This operation requires that the two levers be operated in accordance with the operation procedure. Tedious and cumbersome.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned prior art, and is a safe and fool-proof single lever which can be operated by an inexperienced driver without fail. It is an object of the present invention to provide a tilt cab operation lever device capable of independently operating a wire.

[0005]

An operation lever device for a tilt cab according to the present invention is an operation lever device for operating a tilt cab having a tilt lock device for locking a tilt cylinder, wherein a shaft provided on a base of the operation lever device is provided. Is a plate-shaped main lever that is rotatably pivoted, and the main lever is equipped with an operating handle for operating the main lever, and is a switching valve that switches the tilt cylinder between the tilt-up side and the tilt-down side. Switching means and operating means for operating a start switch of an electric motor for driving an oil pump are provided on the main lever, and the other end of a release wire having one end connected to a tilt stopper device is pivoted coaxially with the main lever. It is connected to the pulled pull lever.

According to the present invention, the switching means comprises a pin attached to the main lever and a cam provided on a switching valve shaft engaged with the pin.

According to the present invention, the operating means comprises a rocker arm swingably attached to a shaft provided on a base and a cam portion formed on a main lever which engages with the rocker arm. I have.

Further, according to the present invention, the pull lever is formed so as to be operably engaged with the release handle in the pulling direction of the release wire by the operation handle, and can be operated by the pull lever alone.

According to the present invention having the above-described configuration, during normal tilt-up, if the operation handle is rotated, the main lever also rotates in the same direction. At the same time, the pin provided on the main lever also rotates,
Turn the cam. As a result, the switching valve of the oil circuit switches to the tilt-up side of the cab. At the same time,
Since the cam portion below the main lever engages with the lower end of the rocker arm to rotate the rocker arm, the upper end of the rocker arm pushes the start switch of the electric motor to operate. As a result, the cab tilts up.

At the time of normal tilt-down, the operation handle is turned in the opposite direction to engage with the pull lever. Then, the release wire is pulled to release the tilt stopper device. On the other hand, a cam provided in the main lever rotates in the opposite direction to switch the switching valve to the tilt-down side. Further, the cam portion of the main lever engages with the lower end portion of the rocker arm to turn on the electric motor start switch that is turned off at the neutral position. This causes the cab to tilt down.

As described above, according to the present invention, normal tilt up and down operations can be performed only by the operation handle. However, for example, if the tilt stopper device is operating due to a problem such as oil leakage after the tilt-up, and it is necessary to pull the release lever alone to release the tilt stopper device, if only the pull lever is pulled, Good.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a base 1 has a flange 2 at a lower end thereof. A groove 2b having substantially the same size as the width of the operation handle 7 for regulating the neutral position of the operation handle 7 is provided substantially at the center.

At a substantially central portion of the base 1, a main lever 5 formed in a triangular shape as a plate-like body as a whole is pivotally mounted on a shaft 9 provided on the base 1, and the main lever 5 has An operation handle 7 made of steel and formed in a belt shape is attached.

Referring to FIG. 2, the operation handle 7 is formed such that one end 7a is formed to be thin, bent, and inserted into a hole 5a provided in the main lever 5.
Is configured to rotate together with the main lever 5 by a hole provided in an intermediate portion of the main lever 5 and a pin 5b provided in the main lever 5. Are biased toward the main lever 5 side. A ball-shaped hand 7a is attached to the other end of the operation handle 7.

A start switch 19 for a motor of an electric pump (not shown) is mounted above the main lever 5, and a rocker arm 15 for pushing a tip 19a for operating the start switch 19 (limit switch) is provided on the base 1. The rocker arm 15 is swingably attached to a shaft 17, and its rocker arm 15 is configured to switch on and off by two cam portions 11 and 13 formed on the main lever 5.

A pin 24 is fixed to the main lever 5, and a shaft 21 fixed to an end of a cam 23 having a V-shaped inner side engaged with the pin 24 is provided on the back surface of the base 1. Connected to a switching valve shaft (not shown).

Further, a pull lever 25 is pivotally attached to the shaft 9 to which the main lever 5 is attached, and a metal fitting 27 fixed to an end of a release wire 31 is pivotally connected to the pull lever 25 by a pin 27a. The outer tube 31a of the release wire 31 is fixed to a flange 3 provided at the right end of the base 1 with a lock nut 32.

The lower end of the pull lever 25 has a bent portion 25.
a is formed, and is configured to engage with the left end of the operation handle 7. Here, reference numeral 21a denotes a washer, and 29 denotes a rubber boot.

The operation will be described below with reference to FIGS.

FIG. 3 shows a normal tilt-up mode. First, the operating handle 7 is slightly pulled toward the front to release the engagement with the groove 2b provided on the flange 2 of the base 1 and to the right in the figure. Rotate until it engages with the end of the groove 2a.
The main lever 5 also rotates counterclockwise about the shaft 9 together with the operation handle 7.

A pin 24 provided on the main lever 5
Pivots counterclockwise and the cam 23 pivots clockwise to switch the switching valve of the oil circuit to the tilt-up side of the cab. At the same time, the cam portion 11 below the main lever 5 is connected to the lower end portion 15a of the rocker arm 15. Engage and rocker arm 15
Is turned counterclockwise, and the upper end 15b pushes the tip 19a of the start switch to turn on, so that the cab tilts up.

FIG. 4 shows a normal tilt-down mode, in which the operation handle 7 is rotated from the state of FIG. 3 to the left until it engages with the groove 2a. At the neutral position, the handle 7 is pulled toward the front to clear the groove 2b, and when it is further turned to the left (clockwise), it is engaged with the pull lever 25 to release the release wire 31.
Is pulled to release a tilt stopper device (not shown).

The pin 24 rotates the cam 23 counterclockwise to switch the switching valve to the tilt-down side, and the cam 13 at the right end of the main lever 5 is connected to the lower end 1 of the rocker arm 15.
The cab is tilted down because the start switch 19 which is turned off in the neutral position is turned on by engaging with 5a.

As described above, the operation can be performed only by the operation handle at the time of normal tilting up and down. For example, after the tilting up, the tilt stopper device is activated due to troubles such as oil leakage and the like. When it is necessary to pull the release lever 25 alone, only the pull lever 25 needs to be pulled.

[0025]

Since the present invention is configured as described above, normal tilt-up and tilt-down can be performed by operating only the operation handle, and if necessary, the release wire can be pulled alone by the pull lever. For,
When the abnormality is released, the tilt stopper device can be released, which is convenient.

[Brief description of the drawings]

FIG. 1 is a perspective view of an operation lever device according to an embodiment of the present invention.

FIG. 2 is a perspective view of FIG.

FIG. 3 is a front view showing a mode in which a tilt-up operation is performed.

FIG. 4 is a perspective view showing a mode in which a tilt-down operation is performed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2, 3 ... Flange part 5 ... Main lever 7 ... Operation handle 9, 17, 21 ... Shaft 11, 13 ... Cam part 15 ... Rocker lever 19 ... Activation switch 23 ... Cam 24 ... Pin 25 ... Pull lever 31 ... Release wire

Claims (4)

[Claims] An operation lever device for operating a tilt cab having a tilt lock device for locking a tilt cylinder, wherein a plate-shaped main lever is pivotally attached to a shaft provided on a base of the operation lever device. An operation handle for operating the main lever is attached to the main lever, a switching means of a switching valve for switching a tilt cylinder between a tilt-up side and a tilt-down side, and a start switch of an electric motor for driving an oil pump. Is provided on the main lever, and the other end of the release wire, one end of which is connected to the tilt stopper device, is connected to a pull lever which is coaxially connected to the main lever. Operating device for tilt cab. 2. A tilt cab operating lever device according to claim 1, wherein said switching means comprises a pin attached to a main lever and a cam provided on a switching valve shaft engaged with said pin. 3. The apparatus according to claim 1, wherein said operating means comprises a rocker arm swingably mounted on a shaft provided on a base and a cam portion formed on a main lever engaged with said rocker arm. Operation lever device for tilt cab. 4. The tilt cab operation lever device according to claim 1, wherein the pull lever is operably engaged with the operation handle in the pull direction of the release wire, and is formed so as to be operated by the pull lever alone.