JPH0718011U - Round screw - Google Patents

Abstract

(57) [Abstract] [Purpose] This invention makes a screwdriver hole 2 of a screw a vertical hole, provides a relaxation curve 4 at the mounting portion of an elliptical groove 3, and uses a circular screwdriver 5 to make an elliptical projection 6 to make a circle. The present invention relates to an improvement of a screwdriver hole for the purpose of frictionally coupling the circular surface of a screwdriver 5 and the circular surface of a round screw 1 to receive a rotational force. [Structure] The screw hole 2 of the round screw 1 is a vertical hole, and an elliptical groove 3 is provided on the circumference thereof. A relaxation curve 4 is provided at the mounting portion of the elliptical groove 3.

Description

[Detailed description of the device]

 In this invention, the shape of the screw hole of the screw is round, and an elliptical groove or (or elliptical protrusion) is provided on the circumference of the screw hole. This is related to screws, which are characterized in that the circular surfaces are pressure-bonded to each other by biting into them to support the rotational force. With the conventional cross hole screw, the more the tightening force is increased, the more easily the screwdriver is lifted up, and the screwdriver hole is idled to crush the screwdriver hole, resulting in poor work efficiency. Therefore, screw producers are making efforts such as quenching to prevent the screwdriver holes from being crushed, but at present it has not been solved. There are spa drive screws, LH sticks (LH-S, ULR-, LR-S) screws, etc. that correspond to cross-shaped screws, but all of them have a structure that uses a combination of corners to transmit rotational force. It is complicated, and it is the best in terms of production and use. The present invention was devised to eliminate the drawback, and explaining it with reference to the drawings, the screw hole 2 of the round screw 1 has a round shape, and an elliptical groove 3 is provided on the circumference thereof. Since this proposal has such a structure, as shown in FIG. 2, if the round screwdriver 4 is inserted into the screwhole 2 of the round screw 1 and rotated, the elliptical protrusion 5 of the round screwdriver automatically becomes an ellipse. It excavates and crimps into the groove 3, and the round screwdriver 4 and the round screw 1 are integrated for excellent workability. If the round screwdriver 4 is a nut and the round screw 1 is a spanner, the nut can be rounded and tightened in the same manner. Advantages of using round screws. (1) The screwdriver does not come out. (2) Do not use useless screw-in thrust. (3) It is easy to use the screwdriver. (4) There is no diagonal tightening. (5) The screwdriver has a long life. Advantages in manufacturing round screws. (1) Since the screwdriver hole is not spun and the screwdriver hole is not crushed, quenching can be omitted if quenching was performed only to protect the screw head. (2) Since it is round and has no corners, there are few quench cracks that occur during quenching due to excessive thermal stress and transformation stress. (3) Since it is round and has no corners, the precision and durability of the punch for punching and the tightening tool can be improved. (4) The appearance is beautiful because it is round and has no corners. (5) Since it is round and has no corners, the life of the screw punch is long, so the production cost can be reduced.

[Submission date] March 17, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content] [Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a screw hole for a screw.

[0002]

[Prior art]

 The conventional method of receiving the rotational force from the screwdriver is the combination of corners.

[0003]

[Problems to be solved by the device]

 The conventional cross hole screw has the drawback that the screwdriver will be exposed if you do not tighten it while pressing it while you work, and the corners of the screwdriver hole will be crushed.

[0004]

Means for Solving the Problems The present invention has been devised to eliminate the drawbacks, and it will be described with reference to the drawings. The screwdriver hole 2 of the round screw 1 is a vertical hole, and an elliptical groove is formed on the circumference thereof. 3 is provided. A relaxation curve 4 is provided at the mounting portion of the elliptical groove 3.

[0005]

[Action]

 Since the present invention has such a structure,

FIG. 2 and

As shown in FIG. 3, if the round screwdriver 5 is inserted into the screwdriver hole 2 of the round screw 1 and rotated, the elliptical relaxation curve 7 of the elliptical protrusion 6 engulfs the relaxation curve 4 of the elliptical groove 3. As a result, the circular surface of the round screwdriver 5 and the circular surface of the round screw 1 are frictionally coupled to each other, and the rotational force is transferred from the round screwdriver 5 to the round screw 1 for excellent workability.

Further, in this method, if the screwdriver and the screw are considered to be opposite, the screw head can be tightened from the outside.

[0007]

【Example】

 Examples will be described with reference to the drawings.

FIG. 4B is a diagram in which a round screwdriver 5 is provided in order to improve the adhesion of the round screw 1 to the screw head, and the depth L thereof is 10: 2 to the depth of the screwdriver hole 2. A ratio of 2.5 is suitable, and a ratio of H is the height of the elliptical projection 6 and a diameter of the round screwdriver 5 is 10 to 1 to 1.5.

In addition, the reason for the screwing hole, which is characterized in that (c) a frictional force of a circular surface is used to receive a rotational force, is as follows. (A) When a corner is attached, the corner collapses. . (B) When the corner is attached, the elliptical projection 6 of the round screwdriver is sheared.

Therefore, the method of the present invention is

FIG. 2 and

As shown in FIG. 3, the relaxation curve 7 of the elliptical projection 6 bites into the relaxation curve 4 of the elliptical groove 3, whereby the circular surface of the round screwdriver 5 and the circular surface of the round screw 1 are frictionally coupled to each other and receive a rotational force. This is the conventional method.

It is completely different from the above.

[0010]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. (A) The screwdriver does not come out. (B) Wasted Do not use screw-in thrust. (C) It is easy to bite into the screwdriver. (D) There is no diagonal tightening. (E) The appearance is beautiful because it is round and has no corners.

[Brief description of drawings]

FIG. 1 is a top sectional view of the present invention.

FIG. 2 is a perspective sectional view of the present invention in use.

[Explanation of symbols]

 1 is a round screw, 2 is a screwdriver hole, 3 is an elliptical groove, 4 is a round screwdriver, 5 is a round screwdriver elliptical protrusion.

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[Procedure amendment]

[Submission date] March 17, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Name of device] Round screw

[Scope of utility model registration request]

[Brief description of drawings]

1 is a plan view of the present invention, and B is a sectional view taken along the line BB in FIG.

FIG. 2A is a perspective sectional view of the present invention during use. B is a sectional view taken along the line BB of FIG.

FIG. 3 of the present invention

FIG. 2 is a partially enlarged view of B.

FIG. 4A is a plan view of the round screwdriver 5 of the present invention. FIG. 4B is a side view of the round screwdriver 5 of the present invention.

[Explanation of symbols] 1 is a round screw, 2 is a screw hole, 3 is an elliptical groove, 4 is a relaxation curve of 3, 5 is a round screw driver, 6 is an elliptical protrusion of 5, and 7 is a relaxation curve of 6.

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (1)

[Scope of utility model registration request] 1. A round screw, characterized in that the screw hole of the screw has a round shape, and the screw hole has no corners.