JPS6135117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical plate member for a jack arm consisting of two vertical plate members and a horizontal member connecting them on one side. forms a contact surface cam part with a curved surface that is horizontal in the longitudinal direction of the vertical plate member and inclined at 20 degrees toward the horizontal member side, and the other side is at a right angle and inclined at 30 degrees toward the base side. The jacking arm is designed to ensure frictional resistance on the contact surface without slipping even when the contact is made at an angle, and by pressing a single plate, the vertical plate member of the arm body and the contact surface cam part can be simultaneously connected. By integrally forming the contact part and reinforcing the connecting part between the vertical plate member and the contact surface cam part, it is made to withstand the load. Furthermore, the conventional tooth-shaped contact part is changed to a heart-shaped part with a curved surface, and both vertical plate members are This invention relates to a method for manufacturing a jack arm that is easy to manufacture and suitable for mass production by forming a plate member into a cam shape with different curved surfaces.

Now, to explain an embodiment for achieving the above purpose, a heart-shaped recess is provided at the tip of the vertical plate member 1a on one side of the arm body 1 bent in a U-shape in cross section.
A contact surface cam provided with a curved surface R in which P ₁ is directed toward the tip and a line C connecting the center P ₂ of the concave part of the heart-shaped cam part and the tip part P ₃ is inclined by 20 degrees toward the horizontal plate member 1b side. At the tip of the vertical plate member 1a' on the other side of the part 2, a line C is drawn with the heart-shaped recess _P1 on the open side and connecting the center _P2 of the heart-shaped cam recess and the pointed end _P3 . The vertical plate member 1 of the arm body 1 is arranged such that a contact surface cam portion 2' having a curved surface R' inclined at 30 degrees on the base side is formed at the tip of the vertical plate members 1a, 1a' on both sides.
a, 1a' and the contact surface cam parts 2, 2' having the curved surfaces R, R' are cut into a developed planar shape, and then the bases 1a-1,
1a'-1 and the center point O of the curved surface of the contact surface cam parts 2, 2'
The insertion hole 4 of the base shaft 3 and the insertion hole 6 of the support shaft 5
At the same time, the reinforcing protrusions 7 are punched out, and the contact surface flanges 2a, 2a' are bent inward on the circumferential sides of the contact surface cam parts 2, 2', and the contact surface The flanges 2a, 2a' for contact surfaces are pressed from the end faces to have wall thicknesses 2b, 2b', and reinforcing portions 8 are integrally formed at the joints between the flanges 2a, 2a' for contact surfaces and the vertical plate members 1a, 1a'. After that, the entire arm is bent into a U-shaped cross section to form the arm A.

Next, the curvature of the heart-shaped contact surface cam parts 2 and 2' will be explained based on Figs. 6 and 7 as follows: OP ₂ =' OP ₄ ='+1 OP ₅ ='+2 〓 ='+ Number of points (However, P ₂ is set to 0) OP ₆ =′+13 The curved surface is formed based on the radius or more.

In the present application, the arm A formed by the above configuration is
This is used to assemble the jack B. To describe its configuration, a shaped bearing 11 is fixed to the upper surface of a grounding board 10, and two insertion holes 12 for the support shaft 5 are formed in the bearing 11 at the same height position. The contact surface cam portions 2 and 2' of the two arms A are fitted into the bearing 11, and the insertion holes 6 of the contact surface cam portions 2 and 2' of each arm A and the insertion hole 12 of the bearing 11 are bored in parallel. The support shaft 5 is inserted, and the bearing 11 and the contact surface cam portions 2, 2' of the arm A are pivotally attached to each other, and a bearing 13 with a shaped lower surface is separately provided. A member 15 is formed, two insertion holes 14 for the support shaft 5 are bored in parallel at the same height position in the bearing 13, and the contact surface cam parts 2 and 2' of the two arms A are fitted into the bearing 13. , the insertion hole 6 of the contact surface cam portion 2, 2' of each arm A and the bearing 1
3 and the support shaft 5 are inserted, and the bearing 13 and the contact surface cam portions 2, 2' of the arm A are pivotably attached to each other, and the base of the arm A provided in the pressure receiving member 15 is attached. 1a-1, 1a'-1 are fitted to the bases 1a-1, 1a'-1 of arm A provided on the grounding board 10 (however, arm A used for the upper part is narrower than arm A used for the lower part, and The lower arm A is designed and manufactured so that it fits tightly into the lower arm A), and the insertion holes 4 are aligned with each other, and the base shaft 3 is fitted and pivoted, and in the base shaft 3, A bearing 17 is provided in the center of the base shaft 3 on one side to allow the rotary shaft 16 to rotate freely but not move back and forth, and a male screw portion 16a of the rotary shaft 16 is provided in the center of the base shaft 3 on the other side.
A bearing 18 having a female thread that is screwed together is provided, and when the rotating shaft 16 is rotated, the bearing 18 moves left and right (or moves back and forth) according to the male thread part 16a, and is assembled into a diamond shape by the four arms A. The pressure receiving member 15 of the jack B moves up and down.

The mechanisms of the bearings 17, 18 and the rotating shaft 16 are the same as those commonly used.

Reference numeral 19 is a well-known mounting bracket for a handle that rotates the rotating shaft 16.

Also, the contact surface cam portions 2, 2' of each arm A are brought into contact so that the contact surface cam portion 2' on one side of one arm A is at the top and the contact surface cam portion 2 on the other side is at the bottom. This is to prevent the force from shifting (see Figure 8).

According to the arm manufactured in the present application, the heart-shaped contact surface cam parts 2 and 2' rotate in contact with each other, so unlike tooth-shaped meshing, the rotation is smooth, and when the rotating shaft 16 is rotated clockwise with the handle, Rotating shaft 16
The bearing 18 screwed onto the male screw 16a moves toward the bearing 17, so the pressure receiving member 15 is raised by the arm A, lifts the load, and rotates in the opposite direction, causing the bearing 18 to move away from the bearing 17. Therefore, the pressure receiving part 15 is lowered.

Since the present application is constructed as described above, the arm main body and the contact surface cam part can be integrally molded at the same time by pressing a single plate, and by reinforcing the connecting part between the arm main body and the contact surface cam part. It has the advantage of being able to withstand loads, and by molding the conventional tooth-shaped contact portion into a cam shape, it is easy to manufacture and suitable for mass production.

[Brief explanation of the drawing]

Figure 1 is a side view of the whole, Figure 2 is a side view of the grounding board and pressure receiving member, Figure 3 is the arm body, Figures 4 and 5 are side views of the vertical plate member, Figures 6 and 7.
The figure is a side view of the contact surface cam portion, and FIG. 8 is a side view of the contact surface cam portion in an engaged state.

Claims (1)

[Claims] 1. A heart-shaped concave portion is directed toward the distal end at the tip of the vertical plate member on one side of the arm body bent into a U-shaped cross section, and the center of the concave portion of the heart-shaped cam and the tip are connected. Curved surface R with a line inclined at 20° to the horizontal plate member
At the end of the vertical plate member on the other side, the heart-shaped recess is on the open side, and the line connecting the center of the recess and the tip of the heart-shaped cam is on the base side. An arm for a jack, characterized in that a contact surface cam portion having a curved surface R′ inclined at an angle of 1° is formed at the tips of vertical plate members on both sides. 2. At the tip of the vertical plate member on one side of the arm body bent into a U-shaped cross section, a heart-shaped recess is directed toward the tip, and a line connecting the center of the recess and the tip of the heart-shaped cam is attached to the horizontal plate member. 20° inclined curved surface R
At the end of the vertical plate member on the other side, the heart-shaped recess is on the open side, and the line connecting the center of the recess and the tip of the heart-shaped cam is on the base side.゜The vertical plate member of the arm body and the contact surface cam portion having the curved surface are formed so that the contact surface cam portion having the inclined curved surface R′ is formed at the tip of each vertical plate member on both sides. After cutting the metal plate into an expanded planar shape, punch out a base shaft insertion hole and a support shaft insertion hole at the base of the vertical plate member and the center point of the curved surface of the contact surface cam part, and insert the reinforcing protrusions outward. Launch,
In addition, the contact surface flange is bent inward on the circumferential side of the contact surface cam part, and the contact surface flange is further pressed from the end face to make it thicker, and the contact surface flange is extended to the vertical plate member to form the contact surface. After integrally forming a reinforcing part at the connecting part between the flange and the vertical plate member, the whole is bent into a U-shaped cross section to form two vertical plate members and a horizontal plate member connecting them on one side. A method of manufacturing an arm for a jackpot, characterized in that: