JPH0636060Y2 - Soundproof structure of forklift - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a soundproof structure for a forklift truck that prevents impact noise between a fork and a tilt bar that occurs when the cargo is empty, and at the same time prevents impact noise between the tilt bar and a bearing.

[Prior art]

The noise caused by the movement of the fork of a forklift truck is a noise pollution to the neighborhood especially in the urban area, and therefore, it is inevitable that the working time is voluntarily regulated or shortened. As a structure for preventing this noise, a structure in which the fork is attached to the lift bracket so that there is no play and the sound is prevented (for example, Japanese Utility Model Publication No. 59-78393 and Japanese Utility Model Publication 59-78395).
No. gazette) is known. However, if the forklift pivotally attaches the fork and the tilt bar coaxially and receives the fork and the tilt bar at the tip of the support portion fixed to the base of the vehicle, lower the fork in an empty state and ground it before When you lift up the car, the fork and tilt bar collide with each other and generate a buffer sound, so the development of technology to prevent this has been awaited.

[Problems to be solved by the device]

The present invention was created as a result of earnest research to eliminate the above-mentioned drawbacks, and its main problem is to prevent noise from being generated by the abutment of the fork, the tilt bar, and the bearing by mutual cushioning to prevent noise from the forklift. It is in providing structure.

[Means for solving problems]

In order to achieve the above object, the device of claim 1 is (a). A tilt bar that is laterally installed between a pair of left and right forks whose upper ends are pivotally attached to a pivot mounted on a lift bracket and a pair of support pieces that are pivotally mounted coaxially with the forks so that they can abut the back of the forks. And a tilt cylinder that abuts against the back surface of the tilt bar and tilts the tilt bar about the pivot as a fulcrum to interlock a fork that abuts against the tilt bar; and a tip of the shortened tilt cylinder that protrudes in the extension direction from its tip position. In a soundproof structure for a forklift including a backside of the tilt bar and a support portion for supporting the backside of the tiltbar, a front-side shock-absorbing structure is provided on the front surface of the tiltbar, the frontside side being arranged at a position where the backside of the fork can abut and protruding forward. The rear member of the tilt bar is arranged at a position where it can abut against the front surface of the supporting portion, and the rear portion of the tilt bar at least partially overlaps with the cushioning material on the front surface side. A cushioning material on the back side is provided so as to project in one direction, and (b). A technical means is provided in which a through hole penetrating through the tilt bar is provided in the front and rear, and a front cushioning material and a back cushioning material are integrally formed. In the invention of claim 2, instead of the configuration (b), (c). A technical measure is taken in which a front cushioning material is fixed to the front surface of a mounting plate having a channel-shaped cross section that is detachably attached to the tilt bar, and a back cushioning material is fixed to the rear surface.

[Action]

Both the fork and the tilt bar have a separate structure in which the upper ends are coaxially pivotally mounted, and a front cushioning material is provided in the lateral direction on the front surface of the tilt bar to cushion the collision with the fork. Further, in addition to this, since the rear cushioning material is provided on the rear surface of the tilt bar, the cushioning material is also cushioned at the time of abutment with the bearing portion, so that noise can be further prevented. Further, in the invention of claim 1, the front and rear cushioning bodies are integrally formed and fitted in the through holes of the tilt bar. According to the second aspect of the invention, the attachment plates are attached to the front and rear surfaces. Therefore, it is possible to easily attach / detach or replace the cushioning material.

【Example】

A preferred embodiment of a soundproof structure for a forklift according to the present invention will be described below with reference to the drawings. The soundproof structure of the forklift truck shown in FIG. 1 to FIG.
It has a publicly known structure in which a pair of left and right forks 3 and a tilt bar 4 are pivotally attached by the same pivot 6 to a lift bracket 2 which is lifted up and down by a mast 1 fixed upright in front of a vehicle (not shown). ing. That is, the fork 3 penetrates the mounting portion 31 at the upper end of the fork 3 into the pivot shaft 6, and is constrained by the bolts inserted at the corresponding portions of the adjusting holes 7 provided at the upper end of the lift bracket 2 so that the fork 3 can pivot back and forth. There is. Further, on both side surfaces of the lift bracket 2, an upper end of a tilt bar support piece 5 is pivotally attached to the pivot shaft 6, and a plate-shaped tilt bar 4 is horizontally mounted on the lower end thereof. The tilt bar 4 faces the midway position of the back surface of the fork 3 and can slide in the same direction independently of the fork 3. On the other hand, a tilt cylinder 8 is fixed to the lower side of a base frame of a vehicle (not shown), and the tip of the telescopic rod thereof is arranged at a position where it can abut against the back surface of the tilt bar 4. At the lower front end of the lift bracket 2, there is provided a pair of left and right support portions 9 that project forward from the tip of the shortened rod of the tilt cylinder 8. In the illustrated example, the support portion 9 is a stopper that abuts when the tilt bar 4 is in a substantially vertical posture. Here, the support portion 9 does not have to be provided on the lift bracket 2. For example, when the tilt bar 4 directly abuts the mast, the abutment portion of the mast serves as the support portion 9 and is directly attached to the vehicle base frame. The stopper piece may have a structure in which a pair of left and right plate pieces are fixed to each other. In short, any member having a stopper function of restraining the tilting of the tilt bar 4 to the rear and holding it at a substantially vertical position may be used. In the present embodiment, the tilt bar 4 is provided with a cushioning material 10 on the front side on the abutment surface with the fork 3 as shown in FIG. This cushioning material 10 is made of hard synthetic rubber in the case of this embodiment, but if it is used as a cushioning material,
The material is paper, cloth, synthetic resin, metal material (for example, spring material)
Etc., and is not particularly limited. The cushioning material 10 is provided on the tilt bar 4 as shown in FIG.
Is formed laterally in the center of the fork 3 along the longitudinal direction thereof and at a length corresponding to the width adjustment interval of the fork 3. Accordingly, when the fork 3 and the tilt bar 4 collide with each other, the cushioning material 10 on the front surface side is interposed between them,
The impact force is buffered to produce a soundproof effect. Further, since the fork 3 and the tilt bar 4 are held in a substantially vertical posture by restraining the rearward tilting by the support portion 9, at this time, the cushioning material 20 on the back side is provided between the tilt bar 4 and the support portion 9. The provision of a soundproofing effect can be further enhanced. Here, in the mounting structure of the cushioning materials 10 and 20 to the tilt bar 4, a through hole 21 that opens at a corresponding portion of the support portion 9 is provided through,
Since a block integrally formed with the cushioning material 10 projecting to the front side and the cushioning material 20 projecting to the back side is fitted to this, the structure can be simplified (see FIG. 4). Further, a case where engagement is used as a mounting structure for these cushioning materials 10 or 20 will be exemplified. In FIG. 5, the attachment plate 10A has a channel-shaped cross section and also serves as a hook, and has a projection 10C in the middle, and cushioning materials 10 and 20 are fixed to both front and rear surfaces. As a result, when the attachment plate 10A is fitted into the tilt bar 4, the cushioning materials 10 and 20 are detachably locked at predetermined positions on the tilt bar 4.

[Effect of device]

As described above, according to the present invention, for example, when the fork is grounded in an empty state and then the lift bracket is pulled up, a buffer generated between the fork and the tilt bar or between the tilt bar and the support portion is provided between the forks and the tilt bar. It is possible to absorb impact force with a soundproof material installed on the floor to prevent noise, and to prevent noise to the neighborhood as much as possible, especially forklift work in urban areas can be performed comfortably and extremely. Be beneficial. Also, it is easy to attach / detach and replace the cushioning material, which is a consumable material,
Since the structure is simple, it is suitable for industrial mass production, and since it can be remodeled to an existing vehicle model by only replacing the parts, it is excellent in versatility and suitable.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a soundproof structure for a forklift according to the present invention, FIG. 2 is a front view of the same, FIG. 3 is a front view of essential parts, and FIG. 4 is a sectional view taken along line bb of FIG. FIG. 5 is a side view showing an example of the case where the cushioning material is fixed to both sides by using the locking means. 1 …… Mast 2 …… Lift bracket 3 …… Fork 4 …… Tilt bar 5 …… Tilt bar support piece 6 …… Pivot axis 7 …… Adjustment hole 8 …… Tilt cylinder 9 …… Bearing part 10 …… Front side cushioning material 11 …… Indentation 20 …… Backside cushioning material 21 …… Through hole

Claims (3)

[Scope of utility model registration request] 1. A pair of left and right forks each having an upper end pivotally attached to a pivot extending horizontally from a lift bracket, and a rear surface of the fork horizontally provided between a pair of support pieces coaxially attached to the pivot of the fork. An abuttable tilt bar, a tilt cylinder that abuts the back surface of the tilt bar and tilts the tilt bar around the pivot as a fulcrum to interlock a fork that abuts against the tilt bar, and extends from the tip end position of the shortened tilt cylinder in the extension direction. In a soundproof structure for a forklift, which comprises a support portion that protrudes and its tip abuts against the back surface of the tilt bar and supports the tilt bar, in the front surface of the tilt bar, is arranged at a position where it can abut the back surface of the fork, and projects forward. A cushioning material on the front side is provided, and it is arranged on the rear surface of the tilt bar at a position where it can abut against the front surface of the supporting portion and overlaps at least partly with the cushioning material on the front side. A cushioning material on the back side protruding rearward at a certain position, a through hole penetrating forward and backward is provided in the tilt bar, and the cushioning material on the front side and the cushioning material on the back side are integrally formed. Characteristic forklift soundproof structure. 2. A pair of left and right forks each having an upper end pivotally attached to a pivot extending across a lift bracket, and a fork rear face provided between a pair of support pieces pivotally attached coaxially to the fork. An abuttable tilt bar, a tilt cylinder that abuts against the back surface of the tilt bar and tilts the tilt bar around the pivot as a fulcrum to interlock a fork that abuts against the tilt bar, and extends from the tip end position of the shortened tilt cylinder in its extension direction. In a soundproof structure for a forklift, which comprises a support portion that protrudes and its tip abuts against the back surface of the tilt bar and supports the tilt bar, in the front surface of the tilt bar, is arranged at a position where it can abut the back surface of the fork, and projects forward. A cushioning material on the front side is provided, and it is arranged on the rear surface of the tilt bar at a position where it can abut against the front surface of the supporting portion and overlaps at least partly with the cushioning material on the front side. Is provided with a cushioning material on the back side that protrudes rearward at the position, and the cushioning material on the front side is fixed to the front surface of the attachment plate that is detachably attached to the tilt bar and has a channel-shaped cross section.
A soundproof structure for a forklift characterized in that a cushioning material on the back side is fixed to the rear surface. 3. The soundproof structure for a forklift according to claim 1, wherein the cushioning material on the front side is formed in a laterally long length corresponding to the width adjustment interval of the fork.