JPS6052006B2 - lift arm plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a lift arm plate used in a tilting device for a loading platform installed in a dump truck or the like.

Conventionally, there are the following types of lift arm plates used in tilting devices for loading platforms installed in dump trucks and the like. In other words, a thick plate material is used and predetermined parts are welded together to form a plate body with approximately Ξ-square side surfaces, and a bearing boss is fixed to a predetermined part of the plate body, or a special feature according to the applicant's application is used. As disclosed in Japanese Patent Application No. 54-12545, there is a device in which a pair of press-formed thin plate bodies are butted together and welded to form a three-dimensional structure, with bearings attached to predetermined parts.In the case of the former, In the latter case, a thick plate material with uniform wall thickness is used to provide strength, so even the parts that do not require strength are thickened, resulting in an increase in weight.On the other hand, in the latter case, an expensive dedicated press mold is required. In addition, since the plate bodies are manufactured by butting a pair of plate bodies, there is a drawback that the plate bodies are required to have a fairly high bending accuracy.

The present invention solves the above-mentioned problems, and aims to provide a lift arm plate that is lightweight, has considerable strength, and can be manufactured through extremely simple steps.

Hereinafter, the configuration of the present invention will be explained based on the attached drawings showing one embodiment.
A tiltable cargo box pivoted to the subframe 3, the base of which is attached to the subframe 2
A hydraulic cylinder 4 is pivotally connected to a lift arm having a substantially Ξ-angular shape, and its top portions are pivoted 6, 7, and 8 to a piston rod of the hydraulic cylinder 3, a cargo box 1, and a tension rod 5. Reference numeral 9 denotes a pivot point between the other end of the tension rod 5 and the subframe 2.

Reference numeral 10 denotes a plate body, which has a long side 11 of a thin plate having a predetermined shape bent to have a U-shaped cross section, and a side 12 opposite to the long side bent to have an L-shaped cross section. It is formed into an approximately pentagonal shape. Reference numerals 13, 14, and 15 are holes bored at the top of the plate body 10 at positions corresponding to the shaft fittings 6, 7, and 8, and bearing bosses 16, 17, 1 are inserted into the holes.
8J and then fixed together with reinforcing members 19, 20, and 21.

A reinforcing material 22 is fixed between the reinforcing materials 19 and 20.

The lift arm plate of the present invention constructed as described above has the following effects. In other words, by using a single thin plate, it is simply pressed (shearing and bending only) to make the long side into a U-shaped cross section.
The plate body is formed by bending the opposite sides of the long side into an L-shaped cross section to form a three-dimensional structure. It is lightweight because it uses a combination of thin plates, and because it has a three-dimensional structure and only strengthens the parts that require strength, it has extremely high strength despite its light weight. Further, since the plate body can be formed by simple press machining to create a three-dimensional structure of the plate body, a special press mold is not required.

Furthermore, since the reinforcing material is individually provided depending on each part requiring strength, an appropriate shape can be selected depending on, for example, the state of stress distribution in each part.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a side view of a cargo box tilting device equipped with the lift arm plate of the present invention, and FIG.
The figure is a front view of the plate body, FIG. 3 is a left side view, and FIG. 4 is a plan view. 10... Plate body, 11... Long side, 12...
One side opposite the long side, 13, 14, 15...hole, 16
, 17, 18... bearing boss, 19, 20, 21...
Reinforcement material.

Claims (1)

[Claims] 1. In a lift arm plate main body whose long side is bent into a U-shaped cross section, and one side opposite to the long side is bent into an L-shaped cross section, and the entire body is formed into a substantially triangular shape, a hole is formed at the top. A lift arm plate characterized in that a bearing boss is fixed to the hole, and a reinforcing material is fixed to the bearing boss.