JPH10331201A - Control lever lock device in industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock a lift control lever so that it can not at least make downward control. SOLUTION: A lock lever 4 capable of pivoting a pivot 5 within range of a specific angle by pulling or pushing control is provided to the side of a lift control lever 1 controlling a hydraulic valve through a push-pull rod 3 by tilting controlling the lift control lever back and forth, and a regulation member interlocking with an interlocking member projected to the push-pull rod 3 is provided to the pivot 5 in a state for the lock lever 4 to make pushing down operation. Urging force for switching operational directions to lock side and unlock side with a neutral position as the boundary is provided to the pivot 5 by a coil spring 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial vehicle in which a valve is operated via a push-pull rod by tilting an operation lever back and forth, and various operations are performed using hydraulic means. To an operating lever locking device.

[0002]

2. Description of the Related Art In an industrial vehicle, for example, a shovel loader, the lifting and lowering operations of a lift arm are performed using a hydraulic cylinder. The hydraulic pressure is supplied to the hydraulic cylinder by operating the hydraulic lever by tilting the operation lever back and forth. In the maintenance of the machine base, the lift arm is often set to a raised position, and work is often performed under the lift arm. Therefore, during the maintenance work, it is necessary to lock the operation lever so as not to move at least in the direction of lowering the lift arm. Conventionally, as a device for locking the lever, in a case where the lift arm is lowered when the lift operation lever is tilted forward, as shown in FIG.
Is known in which a butterfly plate-shaped lock plate 15 that regulates the forward tilting operation is fixed with a bolt 16. The lock plate 15 is normally folded to the front side, and is opened to the front side as necessary.
It is structured so as to be engaged with the lift operation lever 1 so as to straddle, so that the mechanism is simple and can be equipped at low cost.

[0003]

The conventional locking device is:
The appearance is impaired because it is exposed and mounted on the instrument panel surface, and if the operating lever is strongly pushed forward, the plate will be pushed in the floating direction, causing the bolts to loosen or deforming the panel or plate. , Thereby easily deteriorating the locking function. or,
Because of the structure that locks the movement of the lever, the operation is likely to be uncertain due to the play of the link mechanism interposed between the lever and the hydraulic valve.

[0004]

SUMMARY OF THE INVENTION A lock device according to the present invention comprises:
A lock lever is newly provided at an appropriate part of the driver's seat, and a locking portion is formed on a push-pull rod directly connected to the hydraulic valve, and the locking portion is engaged and disengaged by operating the locking lever. There is a provision of a regulating member for preventing the lifting operation of the lift rod when stopped. The regulating member is provided on a rotating shaft that is rotated by operating a lock lever, and the rotating shaft has a locking side for locking the restricting member to the locking member and an opposite unlocking side for locking. It is desirable to set a neutral position in between, and to apply an urging force by a coil spring whose action direction switches to each side from the neutral position.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which a lock mechanism of an operation lever according to the present invention is applied to a shovel loader will be described with reference to the drawings. FIG. 1 is an explanatory view of a lock device,
Reference numeral 1 denotes a lift operation lever provided so that the lower portion of the instrument panel 2 serves as a fulcrum and protrudes upward bypassing the driver's seat front side. , The upper end of the push-pull rod 3 is connected, and the lower end of the push-pull rod 3 is
Connected to the control lever of the hydraulic valve not shown,
When the lift operation lever 1 is tilted back and forth, the push-pull rod 3 is raised or pushed down,
The hydraulic valve is opened and closed.

Reference numeral 4 denotes a lock lever provided on the side of the lift operation lever, and a tip on a root side thereof approaches a short side of the push-pull rod 3 and is horizontally pivoted horizontally. The rotation shaft 5 can be rotated within a certain angle range by being connected to the tip of a link 6 projecting radially from the lock lever 5 and pulling or pressing the lock lever 4. The push-pull rod 3
When the push-pull rod 3 is in the neutral position, the lock lever 4
There is provided a regulating member 8 which is locked to a lower surface with respect to a locking member 7 provided on the push-pull rod 3 in a state where the pressing operation is performed, and which comes off when the lock lever 4 is pulled. When the regulating member 8 is sufficiently detached from the locking member 7 and has a margin to further separate from the locking member 7 from the position, the rotating shaft 5 5
An arm 10 that faces the lower end of the bracket 9 that supports the bridge is projectingly provided. A repulsive force is provided between the tip of the arm 10 and a portion of the bracket 9 below the rotating shaft support. A coil spring 11 is interposed with both ends pivoted. This coil spring 1
1, the rotation shaft 5 rotates to either the side where the regulating member 8 is locked to the locking member 7 or the side where it is released, and the lock lever 4 is accordingly unlocked in the pulling direction. Position or a lock position which is a pressing direction.

The locking device thus formed is shown in FIG.
As shown in (a), when the lock lever 4 is in the unlocked position where it is pulled, the regulating member 8 is not locked by the locking member 7, the push-pull rod 3 can move up and down, and the lift operation lever Can be operated freely. As shown in FIG. 2B, when the lock lever 2 is pressed to the locked position, the regulating member 8 is locked by the locking member 7, the push-pull rod 3 is prevented from descending, and the lift operation lever 1 is moved forward. The tilt operation cannot be performed. Therefore, by operating the lock lever while the arm is raised, for example, when the operator leans forward from the driver's seat and presses the operation lever with his chest, the lever does not tilt. The arm will not be lowered.

In the lock device of this embodiment, most of the mechanism is hidden in the instrument panel, and the lock lever only slightly protrudes outside the instrument panel. The lock lever cooperates with the operation lever. Further, since the structure is such that the movement of the push-pull rod directly connected to the hydraulic valve is restricted, even if there is play in the link mechanism interposed between the lift operation lever and the hydraulic valve, the play is affected by the play. Reliable without any.

The device of the embodiment only functions to prevent the lowering of the lift arm. However, as illustrated in FIG. 3A, for example, the pin-shaped locking member 12 is provided with a through-hole 13a of the regulating member 13. To prevent the lift operation lever from tilting in any of the front and rear directions. Although not shown, the reach operation provided in parallel with the lift operation lever is omitted. The present invention can be applied to other operation levers such as a lever and a dump operation lever. In that case, with the structure of the above embodiment, the rotating shaft is arranged in parallel with the direction in which the push-pull rods are arranged, and each push-pull rod is provided with a locking member, and the rotating shaft corresponds to each locking member. If the regulating member is provided, other operation levers are also locked at the same time.

The lock lever can be operated not only for pulling and pressing, but also for turning back and forth or up and down, or without a turning shaft, and a regulating member can be provided directly on the lock lever. As shown in FIG. 3B, the lock lever 4 is
Can be directly applied to the urging member.

In the present invention, the shapes of the locking member and the regulating member may be appropriately changed. If a locking portion is provided with a drop-preventing function, the reliability is improved. If a ratchet structure is adopted, the operation lever can be used. By setting the lock lever to the lock position while tilting forward, the lock is automatically locked when the operation lever reaches the neutral position.

Also, if the lock lever and the operation lever are color-coded (for example, the lock lever knob is set to a red or yellow warning color for the black knob operation lever), it is possible to prevent erroneous operation and to be a safety device. Along with recognizing, you can expect the effect of raising attention, and besides the shovel loader,
It can be applied to other industrial vehicles such as fork loaders and forklifts.

[0013]

According to the present invention, the lock lever is operated to lock the regulating member on the locking member provided on the push-pull rod, thereby preventing the push-pull rod from being pushed down. The device cannot be tilted forward.The regulating member is hidden under the instrument panel, and only the lock lever protrudes from the driver's seat. It won't hurt. Further, since the movement of the push-pull rod directly connected to the hydraulic valve is restricted, the locking function is reliably exhibited, and the reliability is high. Furthermore, by using a rotating shaft, a plurality of operation levers can be
The locking function can be provided simply by adding a locking member and a locking mechanism.If the biasing force can be switched at the neutral position, the distinction between lock and unlock becomes clear, and the operation Also excellent for rings.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a lock device according to the present invention.

FIG. 2 is an explanatory diagram showing an operation state of lock and unlock.

FIG. 3 is an explanatory diagram of a modified example.

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1. Lift operation lever, 2. Instrument panel, 3. Push-pull rod, 4. Lock lever,
5 ... rotating shaft, 6 ... link, 7 ... locking member, 8 ...
Control member, 9 bracket, 10 arm, 11
・ Coil spring, 12 ・ Locking member, 13 ・ Regulator, 13a ・ ・ Hole, 14 ・ ・ Compression spring, 15
··· Lock plate, 16 · bolt, 17 · guide groove.

Claims (2)

[Claims] 1. A lock lever is newly provided at an appropriate part of a driver's seat, and a locking portion is formed on a push-pull rod directly connected to a hydraulic valve, and the locking portion is disengaged from the locking portion by operating the lock lever. An operation lever lock device for an industrial vehicle provided with a regulating member that operates and at least prevents a pull-down operation of a push-pull rod when locked. 2. The control device according to claim 1, wherein the restricting member is provided on a rotation shaft that is rotated by operating a lock lever. The operation lever according to claim 1, wherein a neutral position is set between the neutral position and the stop release side, and the biasing force is applied by a coil spring whose operation direction switches to each side from the neutral position. Locking device.