JP2638404B2 - Side roller mounting structure for lift bracket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a side roller for receiving a lateral load (lateral load) among rollers mounted on a lift bracket of a forklift.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show examples of the arrangement of rollers mounted on a conventional general lift bracket. Each of the pair of left and right lift brackets 31 includes a pair of upper and lower lift rollers 32 and a pair of upper and lower side rollers 33 on the outer surface thereof. The lift roller 32 receives the front-rear load acting on the lift bracket 31 using the inner surfaces of the flanges before and after the inner mast 34 as rolling surfaces, and the side roller 33 uses the center portion of the inner surface of the inner mast 34 as a rolling surface to lift the lift bracket 31. The side roller 33 is arranged above the lift roller 32 as shown in FIG. 4 in order to receive a lateral load (which is generated when an unbalanced load is applied). It is a target. A pair of upper and lower finger bars 35 for retaining a fork is fixed to the front surface of the lift bracket 31.

[0003]

In the above-described structure, when a lateral load is applied to the side roller 33 due to an eccentric load due to the load, the inward bending load indicated by the arrow is applied to the lift bracket 31. Works. That is, if the lateral load is F and the distance from the rear end surface of the finger bar 35 to the center in the width direction of the side roller 33 is L, a bending load of M = FL acts on the lift bracket 31. become. In the case of the conventional structure, the bending load M is likely to be large because the distance L is long, and when a large bending load is applied, the lift bracket 31 bends inward. As a result, the contact surface of the lift roller 32 with respect to the inner mast 34 is inclined, so that a so-called “twist” occurs. When such a phenomenon is applied to, for example, a free lift, it results in occurrence of lifting or suspension (a phenomenon in which the lift bracket 31 and the inner mast 34 are locked and move integrally).

The bending of the lift bracket 31 can be prevented or reduced by reducing the distance L by disposing the side rollers 33 so as to approach the finger bar 35. However, in the above-described conventional structure, since the upper and lower finger bars 35 are formed in a vertically long rectangular shape having a large vertical width b, the facing distance a between the two finger bars 35 is narrow. Therefore, if the side roller 33 is temporarily
However, there is a problem that the roller pitch cannot be set to be large even if the problem of bending of the lift bracket 31 is solved by disposing. When the roller pitch is small, the ratio of the lateral load to the unbalanced load increases, and the roller strength becomes a problem. Of course, the lift bracket 31
Is set so that its front end extends forward than the current one, it is possible to arrange the side rollers 33 close to the finger bar 35 side while securing the required roller pitch. However, in this case, since the center of the loaded load is displaced forward of the vehicle, a problem that the allowable load is reduced occurs. As another method, for example, the thickness of the lift bracket 31 is set to be large to increase the bending strength.
Can be solved, but such an increase in thickness causes a problem of an increase in weight and cost.

In view of the above-mentioned circumstances, the present invention secures a required roller pitch without reducing the allowable load and without increasing the thickness of the lift bracket, and reduces the deflection of the lift bracket. An object of the present invention is to provide a side bracket mounting structure for a lift bracket that can be prevented.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, it is a mounting structure of a pair of upper and lower side rollers mounted on the lift bracket to receive a lateral load acting on the lift bracket that can move up and down along the mast. Each approximately L
By fixing a pair of upper and lower finger bars for holding a fork to this substantially L-shaped portion, an overlap portion located between the upper and lower finger bar rear ends at the front end of the lift bracket is formed. The upper and lower finger bars are set to have a shape that is substantially square in cross section so that the distance between the upper and lower opposing bars is substantially enlarged, and the front end of the lift bracket is located at a position closer to the front. The pair of upper and lower side rollers is attached using the formed overlap portion.

[0007]

In the lift bracket side roller mounting structure according to the present invention, the upper and lower side rollers can be arranged close to the finger bar on the front end side of the lift bracket. . Therefore, the distance from the rear end face of the finger bar to the center of the side roller is reduced, and the deflection of the lift bracket against a lateral load can be reduced or prevented. Further, with the above configuration, the roller pitch of the side rollers does not become particularly small, and the arrangement of the finger bars closer to the front can be suppressed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a plan sectional view, and FIG. 2 is a side view. As shown in the drawing, a pair of upper and lower lift rollers 2 that receive a load in the front-rear direction with the inner surfaces of the front and rear flanges of the inner mast 4 as rolling surfaces are rotatably mounted on the rear side of the pair of left and right lift brackets 1 on the outer surface side. The lift rollers 2 are basically arranged at the same pitch as in the prior art.

On the other hand, the upper part of the front end of the lift bracket 1 is cut into a substantially L-shape, and upper and lower L-shaped portions 6 are fixed with upper and lower finger bars 5 each having a substantially square cross section. I have. Thus, the front end of the lift bracket 1 and the rear end of the finger bar 5 overlap each other. That is, by making the cross-sectional area of the finger bar 5 substantially the same and changing the cross-sectional shape from a conventional vertically long rectangle to a shape close to a square, the strength of the finger bar 5 itself is secured, The configuration is such that the facing distance a of the finger bar 5 is enlarged. However, the interval from the upper end of the upper finger bar 5 to the lower end of the lower finger bar 5 is set in the same manner as in the related art.

[0010] A pair of upper and lower side rollers 3 for receiving a lateral load acting on the lift bracket 1 is disposed by using the overlap portion 7 of the lift bracket 1. That is, the front end of the roller shaft 8 of the side roller 3 is supported on the overlap portion 7 side. The roller shaft 8 is arranged so that the center of the shaft is located within the distance a facing the finger bar 5 within a range where the roller shaft 8 does not interfere with the finger bar 5. Set to maximum.
Thus, the side roller 3 is disposed at a position close to the finger bar 5, and receives the lateral load with the front flange end surface of the inner mast 4 as a rolling surface. In addition, 9 in the figure
Is the lift bracket 1 for attaching the side roller 3
Is a mounting opening penetrating through.

In the lift roller side roller mounting structure according to the present embodiment, the side roller 3 is moved closer to the finger bar 5 by changing the shape of the lift bracket 1 and the shape of the finger bar 5 as described above. It can be attached to the lift bracket 1. Therefore, when a lateral load is applied to the side roller 3 due to the eccentric load, even if an inward bending load is applied to the lift bracket 1 in accordance with the lateral load, the center of the side roller 3 from the rear end face of the finger bar 5 is applied. Is small, the bending load is small, and the bending of the lift bracket 1 is prevented or slight.

When the configuration of this embodiment is adopted,
The distance from the shaft center of the lift roller 2 to the front end face of the finger bar 5 may be slightly larger than in the past, but even if it is increased, it is only small. It can be suppressed to a minute range.

[0013]

As described in detail above, according to the present invention,
Since the upper and lower side rollers can be arranged close to the finger bar near the front end of the lift bracket, it is possible to prevent the lift bracket from bending when an uneven load is applied. As a result, the problem of lifting and hanging of the lift bracket is solved, and a smooth lifting operation can be obtained. Further, since the roller pitch can be set relatively large while the side roller is arranged in front of the lift bracket, the problem of the roller strength against the lateral load can be avoided. Moreover,
There is no problem of reduction in allowable load when the finger bar is arranged at the front, and no problem of weight increase due to thickening of the lift bracket.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a side roller mounting structure of a lift bracket according to an embodiment of the present invention.

FIG. 2 is a side view showing the same with the inner mast omitted.

FIG. 3 is a cross-sectional plan view showing a conventional structure for mounting a side roller of a lift bracket.

FIG. 4 is a side view showing the same without the inner mast.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lift bracket 2 ... Lift roller 3 ... Side roller 4 ... Inner mast 5 ... Finger bar 6 ... L-shaped part 7 ... Overlap part

Claims (1)

(57) [Claims] 1. A mounting structure for a pair of upper and lower side rollers mounted on a lift bracket to receive a lateral load acting on the lift bracket which can be moved up and down along a mast, wherein the lift bracket is mounted on a front end surface of the lift bracket. The ends are cut out in a substantially L-shape, and a pair of upper and lower finger bars for hanging a fork is fixed to the substantially L-shaped portion, so that the front end of the lift bracket is located between the rear ends of the upper and lower finger bars. The overlap portion located is formed,
Further, the upper and lower finger bars are set to have a substantially square cross section so that the upper and lower opposing gaps are substantially enlarged, and the over bracket formed at the front end of the lift bracket at a position closer to the front. A side roller mounting structure for a lift bracket to which the pair of upper and lower side rollers is mounted using a wrap portion.