JPS6122955Y2 - - Google Patents

Description

[Detailed explanation of the invention] The steel arm of the conventional pantograph type jack is made of a 3- to 4-mm thick steel plate, so the upper arm and lower arm are connected via a pivot. In this case, the upper and lower arms are connected by fitting the small-diameter shaft portions at both ends of the pivot into the notched bearing holes at the end of the arm, crushing the small-diameter shaft ends, and caulking the arm ends. Because the steel plates used for the construction are thick plates that go through the process described above, the manufacturing cost of the jacks is relatively high, which is a disadvantage.In order to reduce this manufacturing cost, this project aims to reduce the required thin steel sheets. This was done with the aim of producing a steel plate arm that can be used without reducing the strength of the arm.

The present invention will be explained below with reference to illustrative drawings. 1 is an arm formed of a thin steel plate, 2 is a notched bearing hole provided at the end of the arm to connect the upper and lower arms 1 via a pivot 3, A reinforcing curved edge 4 is formed on the inner peripheral edge facing the notched bearing hole 2 and the outer peripheral edge of the arm end.

In this case, as mentioned above, the peripheral edge facing the bearing hole of the upper and lower arms connected via the pivot 3 is bent to provide reinforcement, so the connecting part at the end of the arm is significantly strengthened. There is no need to use an expensive steel plate with a thickness of 3 to 4 mm, and an inexpensive thin steel plate, such as a steel plate with a thickness of 2 mm, can be used, so there is an economic advantage that the manufacturing cost is low. Even though the arm is made of thin steel plate, by providing a reinforcing curved edge, the pivot part can be crushed for connection to the pivot in the same way as in the case of an arm using a thick plate. Not only does it not cause bending or warping, but there is no problem with the strength of the arm itself, and the present invention has the effect of reducing the production cost of pantograph type jacks and providing them at low cost.

[Brief explanation of the drawing]

The drawings are examples showing the present invention, and Fig. 1 is a plan view of the jack, Fig. 2 is a side view of the arm, Fig. 3 is a plan view of the arm, and Figs. 4 and 5 are a plan view of the jack provided at the end of the arm. Examples of reinforced curved edges, FIG. 6 is a cross-sectional view taken along the line dd, FIG. 7 is a cross-sectional view taken along the line e-e, and FIG. 8 is a cross-sectional view taken along the line a-
It is an a-line sectional view. 1...Arm, 2...Notched shaft hole, 3...Pivot,
4... Reinforced curved edge.

Claims (1)

[Scope of utility model registration request] The upper arm and the lower arm are each made of a thin steel plate, and the periphery of the connecting end of the upper arm and the lower arm, which are connected via the pivot shaft, as well as the inner part facing the notched bearing hole into which the pivot shaft is fitted, are A steel plate arm of a pantograph type jack, characterized by having reinforced curved edges formed on each peripheral edge.