JPH0540077Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cargo handling operation device for a cargo handling vehicle such as a forklift.

[Prior Art] FIG. 4 schematically shows a hydraulic circuit of a typical cargo handling device in a forklift. As shown in the figure, control valves 3 and 4 are connected to a tail cylinder 1 for tilting the mast back and forth, and a lift cylinder 2 for moving the fork up and down, respectively.
By moving the spools of these control valves 3 and 4 by manual operation of a control lever, the hydraulic pressure supplied to each cylinder 1 and 2 can be controlled.

There have been various types of such cargo handling operation devices, but there is one in which the tail cylinder control valve and the lift cylinder control valve are controlled independently or simultaneously by a single control lever. be. This is a so-called one-lever type cargo handling device.

As shown in FIGS. 5, 6, and 7, a conventional one-lever type cargo handling operating device has two spool operating arms 6 at right angles to each other at the lower end of a control lever 5 that is tilted. Connecting rods 10 and 11 are connected to the spools 8 and 9 of the control valves 3 and 4 for the tilt cylinder and the lift cylinder, respectively, and are connected to ball joints at the tips of the arms 6 and 7, respectively. They are connected via ports 12 and 13. Also,
The twisting direction of the control lever 5, that is, the axis 1
In order to prevent rotation around the control lever 5, tapered guides 16 and 17 are provided between the outer peripheral surfaces of the ball joints 12 and 13 and the lever support bracket 15 that supports the control lever 5. It is interposed so that it can be adjusted freely.

In such a configuration, when the control lever 5 is tilted, the spool operating arm 6,
Since one or both of the arms 6 and 7 are swung upwardly or downwardly, the connecting rods 10 and 11 are moved up and down via the ball joints 12 and 13 as the tips of the arms 6 and 7 move. As a result, the spools 8 and 9 switch oil paths independently or simultaneously to control the amount of oil sent to the tail cylinder or lift cylinder, and perform a predetermined operation. For example, when the control lever 5 is tilted toward the front of the machine (in the direction of arrow 18 in Figure 6), the two spool operating arms 6 and 7 swing downward by the same amount, and the fork lowers and the mast simultaneously moves. Control valves 3 and 4 are controlled to tilt forward.

[Problems to be solved by the invention] In the conventional configuration as described above, the tapered guides 16 and 17 are used to prevent the control lever 5 from rotating in the torsional direction, but the ball joints 12 and 13 If the contact is too tight, the movement will be poor, and if the contact is too loose, it will cause play, making it difficult to adjust the position and requiring a special jig for adjustment.

Furthermore, after assembling this cargo handling device to the machine base, it may be desirable to adjust the left and right positions of the lever knob 5'. However, it was not easy for the reasons mentioned above.

The purpose of the present invention is to solve such problems.

[Means for Solving the Problems] Therefore, in the present invention, instead of the tapered guide, a link mechanism is used to stop the rotation of the control lever. That is, the present invention includes a rotation stopper arm that protrudes from the lower end of the control lever so as to extend along a plane formed by the axes of the two spool operating arms, and a support fixed to the machine frame. and a connecting rod attached via a ball joint between the anti-rotation arm and the support member to limit the torsional rotation of the control lever but not to impede its tilting. Features an operating device.

[Function] In the cargo handling operation device for a cargo handling vehicle according to the present invention having the above-described structure, the tilting operation of the control lever is permitted by the link mechanism composed of the rotation stopper arm, the support member, the connecting rod, and the ball joint. However, rotation in the torsional direction is restricted.

In addition, the connecting rod is a turnbuckle mechanism,
By making it extendable, it becomes possible to easily adjust the left and right positions of the lever knob of the control lever.

[Embodiment] Hereinafter, a preferred embodiment of the cargo handling operation device for a cargo handling vehicle according to the present invention will be described in detail with reference to the drawings.

Note that the same reference numerals are used for the same or equivalent parts as in the conventional configuration.

As shown in FIGS. 1, 2, and 3, the cargo handling device to which the present invention is applied has a lower end portion of the control lever 5 fixed to the machine frame 19, similar to the conventional configuration described above. A lever support ball 20 disposed within the lever support bracket 15 and fixed to the lever support bracket 15 allows
It is supported so that it can be tilted in all plane directions. At the lower end of the control lever 5, two spool operating arms 6, 7 are provided projecting at right angles to each other and also at right angles to the axis 14 of the control lever 5. These spool operating arms 6,
7 has ball joints 12 and 13 at each end.
One side of the ball joints 12 and 13 are connected.
On the other side, via turnbuckles 21 and 22,
Connecting rods 10 and 11 are connected. Each connecting rod 10, 11 is connected to the spools 8, 9 of the tail cylinder and little cylinder control valves 3, 4, respectively.

Further, at the lower end of the control lever 5, a rotation stopper arm 23 is provided protrudingly between the spool operating arms 6 and 7. The axis of this anti-rotation arm 23 is arranged on a plane formed by the axes of the spool operating arms 6 and 7. A connecting rod 25 is connected to the tip of the rotation stopper arm 23 via a ball joint 24, and the other end of the connecting rod 25 is connected to a ball joint on a support plate (supporting member) 26 on the lever support bracket 15. 27. Support plate 2
The center of spherical motion of the ball joint 27 on the 6th side is
In the neutral state, it is on the plane formed by the spool operating arms 6 and 7, and the rotation stopper arm 23
The angle between the connecting rod 25 and the connecting rod 25 is approximately 90 degrees.

The operation of the cargo handling device according to the present invention configured as described above will be explained.

First, when the control lever 5 is tilted to carry out a cargo handling operation, one or both of the spool operating arms 6 and 7 swings around the lever support ball 20, and the ball joint 12, 13 are moved up and down, and the spools 8, 9 of the corresponding control valves 3, 4 are moved via the connecting rods 10, 11. At this time, the rotation stopper arm 23 also moves approximately vertically around the lever support ball 20, but since the connecting rod 25 can also swing following the movement of the arm 23, the control lever 5 can be rotated. The tilting operation is not obstructed.

Furthermore, when an external force in the torsional direction is applied to the control lever 5, the movement of the rotation stopper arm 23 in the lateral direction (arrow 28 in FIG. 2) is prevented by the connecting rod 2.
5, the control lever 5 does not rotate in the torsional direction, that is, around the axis 14, and the play that occurs in the control lever 5 is extremely small.

In this embodiment, as clearly shown in FIG. 2, the connecting rod 25 is a turnbuckle. That is, the connecting rod 25 is provided with a left-handed threaded portion 30 at one end, and a right-handed threaded portion 31 at the other end, and these threaded portions 30 and 31 are connected to each other. The nut 3 of the cylindrical part of the ball joints 24 and 27
2, 33 are screwed together. Therefore, when the connecting rod 25 is turned in either direction, the distance between the ball joints 24 and 27 is adjusted, and the rotation stopper arm 23 is moved to the left or right. Thereby, the position of the lever knob 5' of the control lever 5 can be adjusted as appropriate.

[Effects of the invention] As described above, according to the invention, since the rotation stopper of the control lever is a ring mechanism, the control lever is rotated in a predetermined manner when the assembly of the component parts is completed. Torsional rotation of the lever is prevented. Therefore, there is no need for troublesome adjustments unlike the conventional configuration using a tapered guide, and a certain level of excellent operational stability can be obtained.

In addition, by using a turnbuckle mechanism as the connecting rod, which is a component of the present invention, the position of the lever knob can be easily adjusted even after the cargo handling device is assembled to the machine base, further improving operability. be able to.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a cargo handling device according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 4 is a schematic diagram showing the hydraulic circuit for cargo handling operation in a forklift, FIG. 5 is a front view showing a conventional cargo handling operation device, and FIG. 6 is C in FIG. 5. 7 is a sectional view taken along the line D--D in FIG. 6. FIG. In the figure, 3, 4... control valve, 5...
Control lever, 6, 7... Spool operating arm, 8, 9... Spool, 15... Lever support bracket, 19... Machine frame, 20...
Lever support ball, 23... anti-rotation arm,
24, 27... Turnbuckle, 25... Connection rod, 26... Support plate, 30, 31... Threaded portion.

Claims (1)

[Claims for Utility Model Registration] 1. A control lever that is tilted, two spool operating arms protruding from the lower end of the control lever and extending at right angles to each other, and the tip and end of each spool operating arm. A cargo handling operation device for a cargo handling vehicle comprising a connecting means for connecting the spools of control valves for a tail cylinder and a lift cylinder, respectively, wherein the connecting means extends along a plane formed by the axes of the two spool operating arms. A rotation stopping arm protruding from the lower end of the control lever and a support member fixed to the machine frame side limit the rotation of the control lever in the torsional direction, but are designed to prevent tilting. and a connecting rod attached via a ball joint between the rotation stopper arm and the support member. 2. A cargo handling operation device for a cargo handling vehicle according to claim 1, wherein the connecting rod is extendable and retractable by a turnbuckle mechanism.