JPH01247396A - Mechanism for adjusting stroke of lift cylinder of mast device of fork lift - Google Patents

Abstract

PURPOSE:To facilitate the adjusting operation of a shim adjusting mechanism by providing an opening portion for inserting a shim sideways on a cylinder support and providing a restraining means for restraining the shim from coming off of the cylinder support after inserting the shim. CONSTITUTION:The opening portion 10a of a cylinder support 10 is conformed to the opening portion 11b of a restraining member 11 by inserting a tool into the tool engaging recessed portion 11f of the restraining member 11, a shim 12 is inserted from both opening portions 10a, 11b, and a lift cylinder is lifted up to confirm the adjusting condition of a stroke. After that, by inserting a tool such as a screw driver, etc., again into the tool engaging recessed portion 11f, the restraining member 11 is rotated to a position where the opening portion 10a of the cylinder support 10 is closed by the cylindrical portion of the restraining member 11, i.e., the position where the tapped hole 10c of the cylinder support 10 is opposed to the recessed portion 11e of the restraining member 11. Then, a positioning bolt 14 is screwed in from the tapped hole 10c of the cylinder support 10 and fitted into the recessed portion 11e of the restraining member 11, to prevent the rotation of the restraining member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a forklift mast device, and more particularly to a lift cylinder stroke adjustment mechanism using a shim.

(Prior Art) As shown in FIGS. 5 and 6, a conventional stroke adjustment mechanism for a lift cylinder has a shim 53 interposed between the upper end of a piston rod 51 and the lower surface of a cylinder support 52, and a bolt 54. A configuration in which the piston rod 51 is connected to the cylinder support 52 is adopted.

In addition, as other means, there is a mechanism that adjusts the screwing amount of the bolt as disclosed in Japanese Utility Model Application No. 58-92300 and Japanese Utility Model Application No. 57-165692;
As disclosed in Japanese Patent No. 81296, there is a mechanism using a snap ring.

(Problem to be Solved by the Invention) The conventional shim adjustment mechanism tightens or loosens the bolt 54 each time the shim 53 is adjusted to the cylinder support 5.
2 and the piston rod 51, the shim adjustment work was troublesome and dangerous.

In addition, the bolt screwing mechanism and snap ring mechanism are
Although the adjustment work is easier than the Jim adjustment, there are problems with the strength of the screw threads and snap rings, and the durability is inferior to the Jim adjustment.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stroke adjustment mechanism for a lift cylinder that has excellent durability and allows easy and safe adjustment work of the shim adjustment mechanism.

(Means for Solving the Problems) In order to achieve the above object, the stroke adjustment mechanism of the present invention provides an opening in the cylinder support into which the shim can be inserted from the side, and after inserting the shim, the stroke adjustment mechanism of the present invention It provides regulatory means to control withdrawal from support.

(Function) In the stroke adjustment mechanism configured as described above, a disk-shaped shim is preferably formed with a notch slightly larger than the bolt diameter up to the center, and the cylinder is moved from the opening of the cylinder support to the cylinder support. The cylinder support and piston are interposed between the support and the upper end surface of the piston rod, and after the shim is inserted, the bolt connecting the cylinder support and the piston rod is slightly loosened to prevent the shim from separating from the cylinder support. A shim can be easily inserted between the rod and the upper end surface.

(Example) To explain an example with reference to the drawings, the second figure shows an overall side view of a forklift, in which a body frame 1 is supported movably by front wheels 2 and rear wheels 3, and the front part of the body frame 1 is supported by front wheels 2 and rear wheels 3. A mast device M is attached to the.

As shown in FIGS. 3 and 4, the mast device M operates to raise and lower the inner mast 5 that is guided by the outer mast 4 and raised and lowered, the rifted plaque 7 that is guided by the inner mast 5 and raised and lowered by a chain 6, and the inner mast that is raised and lowered by the chain 6. The lift cylinder 8.8, which is composed of a shift cylinder 8.8, is arranged at the rear of the outer mast 4, and its base end is supported by the outer mast 4, and the upper end of the piston rod 9.9 is fixed to the upper rear side surface of the inner mast 5. It is connected to a cylinder support 10.10.

The connecting portion between the piston rod 9.9 and the cylinder support 10.10 is connected to the cylinder support 1 as shown in FIG.
On the rear side (the rear side refers to the driver's seat side) of the 0, a part of the cylindrical shape is cut out to form an opening 10a, and a port insertion hole 10b is bored in the upper part. A screw hole 10c into which a bolt for positioning the member is screwed is bored near the opening 10a.

Reference numeral 11 denotes a regulating member for regulating the removal of the gym, and is formed of a disc-shaped portion 11a and a cylindrical portion 11c having a cutout portion 11b, and the outer circumferential portion of the cylindrical portion 11c slides on the inner circumferential surface of the cylinder support. , the inner circumferential portion is in sliding contact with the upper end portion of the piston rod 9.

In addition, lid is the port insertion hole 1 of the cylinder support.
Port insertion hole drilled at the position corresponding to 0b, lie
11r is a recess formed at a position corresponding to the screw hole 10c of the cylinder support, and 11r is a tool holding recess formed at a plurality of locations at predetermined intervals on the outer periphery of the disc portion 11c.

Reference numeral 12 denotes a disc-shaped shim, which is disposed on the inner circumferential portion of the regulating member 11 .

Furthermore, a notch 12a is formed in the shim 12 up to the center.

When connecting the cylinder support 10 and the piston rod 9, the connecting port 13 is inserted through the port insertion hole 10b of the cylinder support 10, and the connection port 13 is inserted into the upper end surface of the piston rod 9 through the port insertion hole lid of the regulating member 11 in the axial direction of the piston rod. It is connected by screwing into a screw hole 9a drilled in the. Further, by interposing an appropriate number of shims 12 between the upper end of the piston rod and the regulating member 11, the stroke of the lift cylinder is adjusted.

That is, align the opening 10a of the cylinder support IO and the opening 11°b of the regulating member 11 by inserting a tool such as a screwdriver into the tool engagement recess 11f of the regulating member,
After inserting the shim 12 through both openings 10a and llb, and checking the adjustment of the stroke by raising the lift cylinder, insert a tool such as a screwdriver into the tool engagement recess 11f again, and then insert the shim 12 into the opening 10a of the cylinder support. are blocked in parallel by the cylindrical portion of the regulating member 11, that is, the screw 10c of the cylinder support 10 and the recess li of the regulating member 11
e is rotated to the corresponding position, the positioning bolt 14 is screwed in from the screw hole 10c of the cylinder support 10, and the tip of the bolt is fitted into the recess lie of the restriction member 11, thereby preventing rotation of the restriction member 11. do.

Note that the present invention is not limited to the configuration of the above-mentioned embodiment (it can be modified in various ways, and the following configurations are also possible.

(1) The sacrificial member may have a structure as long as it closes the opening of the cylinder support, and may have a structure in which a plate with a larger title than the opening can be fixed from the outside with bolts or the like.

(2) The positioning bolt that regulates the rotational position of the regulating member may be changed to a detent mechanism using a spring and a ball.

(Effects of the Invention) Since the present invention is configured as described above, the stroke adjustment of the lift cylinder can be performed using highly durable shim adjustment, and the shim can be inserted from the side of the cylinder support. This has the effect that the shim adjustment work can be performed easily and safely.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, in which FIG. 1 is an exploded perspective view showing the connecting portion between the cylinder support and the piston rod, FIG. 2 is an overall side view showing the assembled state, and FIG. The figure is a rear view showing the mast device, and FIG. 4 is a cross-sectional view taken along the line IV-IV. 5 and 6 show a conventional device, FIG. 5 is an exploded perspective view showing a connecting portion between a cylinder support and a piston rond, and FIG. 6 is an exploded sectional view.

Claims (1)

[Claims] In a forklift mast device in which an inner mast is fitted to an outer mast so as to be movable up and down, a base of a lift cylinder is supported on the outer mast side, and a piston rod is connected to the inner mast via a cylinder support, a shim is attached to the cylinder support from the side. A stroke adjustment mechanism for a lift cylinder in a forklift mast device, which is provided with an opening into which a shim can be inserted, and a regulating means for regulating separation of the shim from a cylinder support after the shim is inserted.