JPH0710491A - Side shift device of forklift - Google Patents

Abstract

PURPOSE:To provide a side shift device which can reduce width in the up and down directions without reducing strength necessary for an upper shifter bar. CONSTITUTION:In a side shift device of a fork lift which consists of a hook 9 by which an upper shifter bar 6 of a shifter 5 is hooked along a rail 3 fixed on a front face of a lift bracket 2 in such a manner that it can travel transversely, a fork bar 10 on which a fork 4 can be hooked, and an intermediate plate 11 which connects the fork bar 10 and the hook 9 between them, three members of the hook 9, fork bar 10, and the intermediate plate 11 which are constituent members of the upper shifter bar 6 are formed integrally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side shift device for a forklift capable of laterally moving an attachment such as a fork along a rail provided on a lift bracket via a shifter.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional general side shift device. As shown in the figure, a fork 4 as an attachment is attached via a shifter 5 to the upper and lower rails 3 fixed to the front surface of a lift bracket 2 that can move up and down along a mast 1 so as to be laterally movable. As shown in FIG. 5, the shifter 5 includes upper and lower shifter bars 6 and 7.
And the left and right vertical plates 8 that connect the shifter bars 6 and 7 to each other to form a substantially horizontally long rectangular frame. As shown in FIG. 4, the upper and lower shifter bars 6 and 7 are both hooks 9 that are horizontally movably hooked on the rail 3 and a fork bar 10 for hooking the hooks of the forks 4.
And an intermediate plate 11 for connecting the fork bar 10 and the hook 9 to each other in the middle. In general, the upper shifter bar 6 is horizontally long and has the same length for all three members, but the lower shifter bar 7 has only the fork bar 10 horizontally long, and the hook 9 and the intermediate plate 11 are divided into left and right. It has a structured structure.

Further, a shift cylinder 12 is disposed laterally between the upper and lower shifter bars 6 and 7, and the main body side of the shift cylinder 12 is fixed to a lift bracket 2.
3 and the rod side is attached to a bracket 14 fixed to the shifter 5. Then, the shift cylinder 12 expands and contracts to move the shifter 5 and the fork 4 together.
Is laterally moved with respect to the rail 3. Although illustration is omitted, in general, a liner is interposed between the sliding surfaces of the upper and lower shifter bars 6 and 7 and the upper and lower rails 3 in order to facilitate the lateral movement of the shifter 5.
However, a roller may be provided instead of the liner on the lower shifter bar 7 side.

[0004]

Generally, in the above-mentioned side shift device, the front view when the side shift device is located in front of the driver's seat has an opening formed in the rail 3 and the shifter 5. It is secured by a part, that is, a gap formed between the upper and lower rails 3 and a gap formed between the upper and lower shifter bars 6 and 7 of the shifter 5 (actually, a gap between each bar and the shift cylinder 12). ing. Therefore, in order to obtain a wide front view, it is preferable that the distance between the bars is as large as possible.

By the way, in the case of the above-mentioned upper shifter bar 6 of the conventional shifter 5, the three members, that is, the hook 9, the intermediate plate 11, and the fork bar 10, which are the constituent members, are all horizontally long and of equal length. It is composed of members, and has a structure in which these three members are joined by welding as shown in FIG. In this case, in order to secure the welding strength between the intermediate plate 11 and the fork bar 10, it is advantageous that the overlapping interval L1 in the vertical direction between both members is large. That is, since the fork 4 for loading a load is hooked on the fork bar 10, a moment is often applied in a diagonally forward and downward direction in FIG. 6, and as a result, the intermediate plate 11 and the fork bar 10 are The larger the overlapping interval L1 is, the more resistant it is to the moment, and the welding strength between the intermediate plate 11 and the fork bar 10 increases. Further, particularly for welding the lower end edge, the lower portion of the fork bar 10 is projected from the lower end of the intermediate plate 11 by a predetermined amount L2 as a welding allowance. Therefore, the overlap width L1 + welding allowance L2 is defined as the vertical width required for welding.
Has been secured. For this reason, the vertical width H of the entire upper shifter bar 6 becomes large, which is one of the causes of obstructing the forward field of view described above.

In view of the above problems, the present invention is to solve the problem by providing a side shift device capable of reducing the vertical width of the upper shifter bar without impairing the strength required for the upper shifter bar. Subject.

[0007]

In order to solve the above problems, the present invention is configured as follows. That is, the attachment is movably attached to the front of a horizontally long rail fixed to a lift bracket that moves up and down along the mast via a shifter, and the upper shifter bar of the shifter is horizontally movable to the rail. In a side shift device of a forklift having a structure including a hook that can be hooked, a fork bar that can be hooked by the attachment, and an intermediate plate that connects the fork bar and the hook to each other, a side shift device that is lateral to the rail. By providing a recess corresponding to the foot of a hook that can be movably hooked, and a recess corresponding to the foot of a fork bar to which the attachment can be hooked in a horizontally elongated member, it is a constituent member of the upper shifter bar. The three members of the hook, fork bar, and intermediate plate are integrally formed. It is set to.

[0008]

In the side shift device according to the present invention configured as described above, by forming the constituent members of the upper shifter bar integrally, the same strength as compared with the case of the welded structure is ensured, The vertical width can be reduced. In addition to this, the vertical width of the upper shifter bar can be reduced by the amount that the setting of the welding margin is unnecessary. Therefore, the upper and lower overall width of the upper shifter bar is reduced as compared with the conventional welded structure.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of the side shift device, and FIG.
Is a front view of the shifter, and FIG. 3 is a cross-sectional view of the upper shifter bar. As shown in FIG. 2, the shifter 5 according to the present embodiment has a substantially horizontally long rectangular shape by horizontally extending upper and lower shifter bars 6 and 7 and left and right vertical plates 8 connecting the both shifter bars 6 and 7 to each other. It has a frame shape.

As shown in FIGS. 1 and 2, the upper shifter bar 6 of the shifter 5 is hooked on the upper rail 3 so as to be laterally movable and the fork 4 serving as an attachment. The fork bar 10 and the intermediate plate 11 connecting the two members together. That is, the three members which are the constituent members are, for example, by rolling, drawing, casting, or forging, and the like, and a concave portion corresponding to the foot of the hook 9 in a horizontally elongated metal member,
The recess corresponding to the corner of the fork bar 10 is formed so as to be integrally formed. In this case, it is desirable that the corners of the integrated upper shifter bar 6 are formed in a curved shape as shown to avoid stress concentration.

On the other hand, as for the lower fork bar 7, as shown in FIGS. 1 and 2, a horizontally long fork bar 10, a left and right intermediate plate 11 fixed to the back surface of the fork bar 10 and hooks as in the conventional case. It is composed of 9 and 9. Further, since the other configurations of the side shift device are the same as those of the related art, the same reference numerals as those of the related art shown in FIG.

In the side shift device according to this embodiment, as described above, the constituent members of the upper shifter bar 6 in the shifter 5 are integrated, and by this,
The strength of the hook 9 and the fork bar 10 can be increased as compared with the conventional partial welding structure in which the edge portions of the hook 9 and the fork bar 10 are joined to the intermediate plate 11. Therefore, while securing the required strength as the upper shifter bar 6, as shown in FIG. 3, the vertical width L3 from the lower end edge of the upper shifter bar 6 to the bottom surface of the notch recess for recessing the fork is reduced. Is possible.

In addition, the vertical width L3 is also reduced by eliminating the welding margin required for the welded structure. As a result, the vertical width H of the entire upper shifter bar 6 is shortened. As a result, as shown in FIG. 1, since the distance A between the upper shifter bar 6 and the lower shifter bar 7 becomes wider, the shift cylinder 1 is provided between the shifter bars 6 and 7.
It is possible to increase the distance between the shift cylinder 12 and the upper and lower shifter bars 6 and 7, that is, the front view when the two are arranged.

[0014]

As described in detail above, according to the present invention,
Since the vertical width of the upper shifter bar of the shifter can be reduced, the forward field of view through the opening of the shifter can be widened, which is effective in improving the safety and work efficiency of cargo handling work. Further, since the shifter is lightened by reducing the vertical width, the allowable load of the vehicle can be increased accordingly.

[Brief description of drawings]

FIG. 1 is a side view of a side shift device according to an embodiment of the present invention.

FIG. 2 is a front view of a shifter.

FIG. 3 is a sectional view of an upper shifter bar.

FIG. 4 is a side view of a conventional side shift device.

FIG. 5 is a front view of a conventional shifter.

FIG. 6 is a cross-sectional view of a conventional upper shifter bar.

[Explanation of symbols]

 1 ... Mast 2 ... Lift bracket 3 ... Rail 4 ... Fork 5 ... Shifter 6 ... Upper shifter bar 9 ... Hook 10 ... Fork bar 11 ... Intermediate plate

Claims (1)

[Claims] 1. An attachment is attached to a front surface of a horizontally long rail fixed to a lift bracket that moves up and down along a mast so as to be laterally movable via a shifter, and an upper shifter bar of the shifter is laterally attached to the rail. A side shift device for a forklift having a structure including a movably hookable hook, a fork bar to which the attachment can be hooked, and an intermediate plate connecting the fork bar and the hook to each other, A component of the upper shifter bar is provided by providing a horizontally elongated member with a recessed portion corresponding to the hook portion capable of laterally hooking on the rail and a recessed portion corresponding to the fork bar portion capable of hooking the attachment. The above-mentioned hook, fork bar, and intermediate plate are integrally formed. Shift device.