JPH0571914U - Operating lever support structure - Google Patents

Abstract

(57) [Summary] [Purpose] To clarify the operating force received by the operator from the operating lever and improve the operability of the operating lever. According to the operation lever support structure, the operation lever 27 (lift lever 21, tilt lever 22) of the forklift is rotatably attached to the vehicle body 23 by the rotation shaft 28, and is biased and held at the neutral position by the coil spring 29. At the same time, the auxiliary spring 32 increases the operation force from the predetermined operation angle of the operation lever main body 27.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support structure for an industrial operation lever such as a forklift.

[0002]

[Prior Art]

 In addition to the lever used for traveling, the forklift is provided with an operating lever for operating the fork and mast. This fork can be moved up and down and tilted back and forth for cargo handling work.

Conventionally, an operation lever for moving a fork is provided near the driver's seat and extends upward from the floor surface. Then, the worker operates the operation lever back and forth, or left and right to move the fork to perform the cargo handling work.

[0004]

[Problems to be solved by the device]

 The above-described conventional forklift operation lever is a mechanical fork lift, and the operation amount of the operation lever is transmitted to the control valve via a mechanical link mechanism to control the opening degree of this control valve. The fork movement speed, etc. is adjusted by controlling the amount of oil. However, in recent years, instead of such a mechanical forklift truck, an electronically controlled forklift truck that can perform a predetermined control by operating the operation lever with a significantly lighter operating force has rapidly spread. There is.

In such an electronically controlled forklift, a potentiometer is connected to an operation lever for operating a fork and a mast, and the spring is biased and held at a neutral position by a spring and pivoted to one or the other. The fork moves up and down and tilts when operated. However, the electronically controlled forklift reduces the operating force of the operating lever and makes it easier to operate, but the operating stroke becomes extremely short, making it difficult to perform fine adjustment movements of the fork. was there. In addition, there was a problem that it was difficult for the operator to know when to start moving the forks received from the operation lever, and the operability deteriorated.

The present invention solves such a problem, and an object of the present invention is to provide a support structure for an operating lever that improves operability.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the operating lever support structure of the present invention is such that the operating lever is rotatably attached to the base by the rotating shaft, is urged and held in a predetermined position by the coil spring, and the operating lever is supported by the auxiliary spring. The feature is that the operation force is increased from a predetermined operation angle.

[0008]

[Action]

 When the operation lever is operated, the operation force is applied to this operation lever only by the biasing force of the coil spring at the start of rotation, and the biasing force of the auxiliary spring is applied at a predetermined operation angle, and the operation force is increased. Become.

[0009]

【Example】

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

FIG. 1 is a sectional view of a main part of an operating lever showing a support structure of an operating lever according to an embodiment of the present invention, FIG. 2 is a graph showing a change in operating force with respect to a stroke of the operating lever, and FIG. 3 is a forklift. ..

As shown in FIG. 3, the forklift 11 is provided with a driver's seat 12 in the center, and an engine (not shown) is mounted below the driver's seat 12. By operating a handle 13 and an accelerator (not shown), the front and rear Wheels 14 can be driven to travel.

The forklift 11 is provided with a pair of left and right outer masts 15 at the front portion thereof, and the outer mast 15 is also provided with a pair of left and right inner masts 16. A pair of left and right L-shaped forks 17 are fixed to a bracket 18, and the bracket 18 is movably supported by the inner mast 16. A lift cylinder 19 is attached to the outer mast 15 so that the inner mast 16 can be moved with respect to the outer mast 15. The bracket 18 to which the fork 17 is attached is connected to a drive chain (not shown). The fork 17 can be moved with respect to the inner mast 16.

Further, a pair of left and right tilt cylinders 20 are attached to the front portion of the forklift 11, and the fork 17 can be tilted via the outer mast 15 and the like.

The forklift 11 of this embodiment is provided with a lift lever 21 for operating the lift cylinder 19 and a tilt lever 22 for operating the tilt cylinder 20 on the side of the driver's seat.

As shown in FIG. 1, an opening 24 is formed at a predetermined position of the vehicle body 23, and a lift lever 21 and a tilt lever 22 are rotatably attached to the opening 24. That is, the lever body 27 including the lever portion 25 and the base portion 26 is rotatably attached to the rotation shaft 28 of the vehicle body 23. A coil spring 29 is wound around the rotary shaft 28, and each end of the rotary shaft 28 is locked by a pin 30 fixed to the vehicle body 23 and a pin 31 fixed to the lever body 27. Therefore, the lever main body 27 is biased and held at the neutral position shown in FIG.

A plate-shaped auxiliary spring 32 is located above the opening 24 along the outer shape of the base 26 of the lever body 27, and the base end thereof is fixed to the vehicle body 23 by a bolt 33. At this time, a gap S is formed between the auxiliary spring 32 and the lever body 27. A cover 34 covers the lever portion 25 and the opening 24 of the lever body 27.

To move the fork 17 of the forklift 11, the lift cylinder 21 and the tilt cylinder 20 are operated by operating the lift lever 21 and the tilt lever 22 on the side of the driver's seat. That is, when the lift lever 21 or the tilt lever 22 (lever body 27) is rotated around the rotation shaft 28 as a fulcrum, the operation amount is transmitted to the control valve via a potentiometer (not shown), and this control is performed. The movement of the fork 27 is adjusted by controlling the opening of the valve to control the amount of oil.

At this time, as shown in FIG. 3, the lever body 27 rotates by the gap S from the neutral position of the lever body 27 in contact with the auxiliary spring 32, depending on the operation force with respect to the stroke of the lever body 27. The biasing force of the coil spring 29 becomes the operating force from a to b in FIG. Then, the biasing force of the auxiliary spring 32 acts here, and the operating force increases from b to c. After that, the operating force of the lever main body 27 becomes a value along the biasing force curve F having a larger inclination than the biasing force curve f of the coil spring 29.

[0019]

[Effect of the device]

 As described above in detail with reference to the embodiments, according to the operating lever support structure of the present invention, the operating lever is rotatably attached to the base by the rotating shaft and is biased and held in a predetermined position by the coil spring. At the same time, the auxiliary spring increased the operating force from the specified operating angle of the operating lever, so that when the operating lever was operated, the operating force increased due to the biasing force of the auxiliary spring from the specified operating angle, and the operator Since the operating force received is clarified, the fine adjustment movement of the fork is facilitated, and the operability of the operating lever can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of an operation lever showing a support structure for an operation lever according to an embodiment of the present invention.

FIG. 2 is a graph showing a change in operating force with respect to a stroke of an operating lever.

FIG. 3 is a perspective view of a forklift.

[Explanation of Codes] 11 Forklift 15 Outer Mast 16 Inner Mast 17 Fork 17 19 Lift Cylinder 20 Tilt Cylinder 21 Lift Lever 22 Tilt Lever 27 Lever Body 28 Rotation Axis 29 Coil Spring 32 Auxiliary Spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ron Matsuda 3000 Tana, Sagamihara, Kanagawa Mitsubishi Heavy Industries, Ltd. Sagamihara Manufacturing Co., Ltd. (72) Yukio Uchiyama 3000, Tana, Sagamihara, Kanagawa Mitsubishi Heavy Industries, Ltd. Sagamihara Works (72) Creator Toshiyuki Midorikawa 3000, Tana, Sagamihara City, Kanagawa Prefecture M ・ E ・ I ・ Sagami Hightech Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An operating lever is rotatably attached to a base by a rotating shaft, is urged and held in a predetermined position by a coil spring, and an operating force is increased from a predetermined operating angle of the operating lever by an auxiliary spring. Characteristic operation lever support structure.