JPH0648694A - Side roller mounting structure for lift bracket - Google Patents

Abstract

PURPOSE:To prevent a lift bracket from deflection at the time of acting of an uneven load by arranging a side roller for receiving a lateral load of the rollers, mounted on the lift bracket of a forklift, in a condition that the side roller approaches a finger cover to a front end part of the lift bracket. CONSTITUTION:In a forklift, a pair of upper/lower lift rollers 2 for receiving a longitudinal directional load with front/rear flange internal surfaces of an inner mast 4 serving as a rolling surface are rotatably mounted on an external surface side rearward of a pair of right/left lift brackets 1. An edge end upper part of the lift bracket 1 is formed respectively into cut off almost L shape, and upper/lower finger bars 5 formed into an almost right square section are secured to these upper/lower almost L-shaped parts 6, to overlap a front single part of the lift bracket 1 with a rear end part of the finger bar 5. A pair of upper/lower side rollers 3 for receiving a lateral load of acting on the lift bracket 1 are arranged by utilizing an overlap 7 of the lift bracket 1.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of 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 rollers 32 receive front-rear loads acting on the lift brackets 31 with the inner surfaces of the front and rear flanges of the inner mast 34 as rolling surfaces, and the side rollers 33 use the central portion of the inner surface of the inner mast 34 as a rolling surface to lift the lift brackets 31. Is arranged so as to receive a lateral load (generated when an unbalanced load acts) on the side roller 33. In this case, the side roller 33 is generally arranged above the lift roller 32 as shown in FIG. Target. A pair of upper and lower finger bars 35 for hooking the forks are fixed to the front surface of the lift bracket 31.

[0003]

In the above structure, when a lateral load is applied to the side roller 33 due to an eccentric load due to a load, the lift bracket 31 is subjected to an inward bending load indicated by an arrow. Works. That is, when the lateral load is F and the distance from the rear end surface of the finger bar 35 to the center of the side roller 33 in the width direction is L, a bending load having a magnitude of M = FL acts on the lift bracket 31. become. In the case of the conventional structure, since the distance L is long, the bending load M is likely to be large, and when a large bending load is applied, the lift bracket 31 is bent inward, As a result, the contact surface of the lift roller 32 with respect to the inner mast 34 is tilted, and so-called "twisting" occurs. When such a phenomenon is applied to, for example, a free lift, it results in lifting or hanging (a phenomenon in which the lift bracket 31 and the inner mast 34 move in a locked state and move integrally).

By the way, the bending of the lift bracket 31 can be prevented or reduced by arranging the side roller 33 close to the finger bar 35 and reducing the distance L. However, in the above-described conventional structure, since the upper and lower finger bars 35 are formed in a rectangular shape having a vertically long cross section with a large vertical width b, the facing distance a between both finger bars 35 is narrow. Therefore, if this portion is used, the side roller 33
Even if an attempt is made to solve the problem of the bending of the lift bracket 31 by disposing the above arrangement, there is a problem that the roller pitch cannot be set large. When the roller pitch is small, the ratio of the lateral load to the unbalanced load becomes large, and the roller strength becomes a problem. Of course, the lift bracket 31
Is set to have a shape in which the front end portion thereof extends forward of the current one, it is possible to arrange the side rollers 33 close to the finger bar 35 side while ensuring a required roller pitch. However, at this time, the center of the loaded load is displaced toward the front of the vehicle, which causes a problem that the allowable load is reduced. In addition, as another method, for example, the lift bracket 31 may be configured to have a large wall thickness to increase bending strength.
It is possible to solve the problem of bending, but there is a problem that such thickening causes 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 then flexes the lift bracket. It is a technical problem to be solved to provide a side roller mounting structure for a lift bracket that can be prevented.

[0006]

In order to solve the above problems, the present invention is configured as follows. That is, in a mounting structure of a pair of upper and lower side rollers mounted on the lift bracket so as to receive a lateral load acting on the lift bracket that can move up and down along the mast, the lift bracket has upper and lower end portions at its front end face. About L
The upper and lower finger bars for hooking the fork are fixed to the substantially L-shaped portion to form an overlap portion located between the rear end portions of the upper and lower finger bars at the front end portion of the lift bracket. Further, the upper and lower finger bars are formed in a shape close to a square cross section so that the upper and lower facing distances thereof are substantially enlarged, and the front end portion of the lift bracket is located at the front position. It is characterized in that the pair of upper and lower side rollers are attached by utilizing the formed overlap portion.

[0007]

In the side roller mounting structure of the lift bracket according to the present invention constructed as described above, the upper and lower side rollers can be arranged on the front end side of the lift bracket in the state of being close to the finger bar. . Therefore, the distance from the rear end surface of the finger bar to the center of the side roller is reduced, so that the bending of the lift bracket against a lateral load can be reduced or prevented. Further, with the above-described configuration, the roller pitch of the side rollers does not become particularly small, and the finger bar can be restrained from being arranged forward.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a plan sectional view, and FIG. 2 is a side view. As shown in the figure, a pair of upper and lower lift rollers 2 for receiving a front-back direction load are rotatably attached to the outer rear side of the pair of left and right lift brackets 1 with the inner front and rear flanges of the inner mast 4 as rolling surfaces. The lift rollers 2 are basically arranged at the same pitch as the conventional one.

On the other hand, the upper portion of the front end of the lift bracket 1 is cut into a substantially L shape, and upper and lower finger bars 5 formed in a substantially square section are fixed to the upper and lower substantially L-shaped portions 6, respectively. There is. As a result, 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 the conventional vertically long rectangle to a shape close to a square, the strength of the finger bar 5 itself is ensured, and The configuration is such that the facing distance a of the finger bar 5 is enlarged. However, the distance 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 the conventional one.

Therefore, the pair of upper and lower side rollers 3 for receiving the lateral load acting on the lift bracket 1 are arranged by utilizing 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 by the side of the overlapping portion 7. The roller shaft 8 is arranged such that the shaft center thereof is located within the facing distance a of the finger bar 5 within a range where it does not interfere with the finger bar 5, whereby the roller pitch P of the side roller 3 is within a possible range. Set to maximum.
Thus, the side roller 3 is arranged at a position close to the finger bar 5 and receives the lateral load with the front end surface of the flange of the inner mast 4 as a rolling surface. In addition, 9 in the figure
Lift bracket 1 for mounting side rollers 3
It is an opening for mounting which is penetrated through.

In the side roller mounting structure of the lift bracket according to this embodiment, the side roller 3 is brought close 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 an eccentric load, even if an inward bending load is applied to the lift bracket 1 along with that, a center of the side roller 3 from the rear end surface of the finger bar 5 is applied. Since the distance L to is small, the bending load is small, and the lift bracket 1 is prevented from bending or is slightly bent.

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 conventional case, but even if it is increased, it will be a little. 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 unbalanced 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, although the side rollers can be arranged near the front of the lift bracket, the roller pitch can be set relatively large, so that the problem of roller strength against lateral load can be avoided. Moreover,
There is no problem of reducing the allowable load when the finger bar is arranged on the front side, and no problem of weight increase due to thickening of the lift bracket.

[Brief description of 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 inner mast with the same omitted.

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

FIG. 4 is a side view of the same in which the inner mast is omitted.

[Explanation of symbols]

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

Claims (1)

[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 lifted and lowered along a mast, wherein the lift bracket has a front end surface above and below. The ends are notched in a substantially L shape, and a pair of upper and lower finger bars for hooking a fork are fixed to the substantially L shape so that the front end of the lift bracket is between the upper and lower finger bar rear ends. The overlapped part located is formed,
Further, the upper and lower finger bars are set to have a shape close to a square in cross section, and the upper and lower facing distances thereof are substantially enlarged, and the overhang formed at the front end portion of the lift bracket is located at the front position. A side roller mounting structure for a lift bracket in which the pair of upper and lower side rollers are mounted using a lap portion.