JPH0592524U - Locking bolts for fastening - Google Patents

Abstract

(57) [Summary] [Purpose] After tightening screws and bolts to the material to be clamped, the tightened state is maintained for a long time, and safety and workability are improved, and the manufacture of conventional cold forging machines, etc. A machine-uniform product can be provided at low cost. [Structure] A plurality of concave and convex grooves (7) and (8) extending from the threaded portion to the peripheral edge (5) on the entire supporting surface (4) of the screw and the bolt.
Is provided, and the concavo-convex groove is deformed when screws or bolts are fastened,
Further, by using the special washer (9) together, interference between the concave and convex groove and the special washer can be obtained when the screw or the bolt is fastened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is intended to maintain a tightened state for a long time after fastening, and a great effect can be obtained by using a special washer such as a toothed washer and a spring washer together.

[0002]

[Prior Art]

 Conventionally, as a loosening prevention mechanism, in addition to the load support surface, there is one that has a plurality of serrated projections as a loosening prevention, which is fastened by biting into the mating portion.

[0003]

[Problems to be solved by the device]

 This had the following drawbacks. (B) Due to the complicated shape and structure, it was difficult to standardize in terms of manufacturing problems and price. (B) Washers such as toothed washers and spring washers could not be used. The present invention has been made to eliminate these drawbacks.

[0004]

[Means for Solving the Problems]

 By providing a plurality of concave grooves (7) with a constant width on the support surface (4) of the bolt, the concave and convex grooves are joined to the clamped material (10) when tightening the bolt, and a special washer (9) is also used to provide a toothed washer. The present invention, in which the tooth profile and the cut surface of the spring washer are bite into the concave-convex groove, is the fastening lock bolt having the above-mentioned configuration.

[0005]

[Action]

 By tightening the bolt, the supporting surface of the bolt and the clamped part come into contact with each other, and as the clamping force increases, the irregularities provided on the support surface are mechanically coupled with the clamped material, and toothed washers, spring washers, etc. When used together, the tooth profile of the toothed washer and the cut surface of the spring washer dig into the multiple grooves with a constant width on the bolt support surface to enhance the locking effect after tightening the bolt.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 12 show an embodiment of a locking bolt for fastening according to the present invention, FIG. 1 is a projected view of a hexagonal bolt of the bolt, and FIG. 2 is a front view of the hexagonal bolt of the bolt. , Fig. 3 is a plan view seen in the direction of the arrow along the line AA in Fig. 2, Fig. 4 is a front view of the hexagon socket head cap screw of the same bolt, and Fig. 5 is B in Fig. 4. It is the top view seen in the direction of the arrow along the -B line. FIG. 6 is a front view of a pan head machine screw in the bolt. Trapezoidal shape with a constant width shape from the shaft part (2) to the peripheral edge of the bolt supporting surface (4) with a plurality of radial concave grooves (7) divided into 2 to 24 equal parts and an angle of 10 to 60 degrees. Is appropriate, and it is desirable that the concave and convex grooves are formed in a depth of 0.5 to 1 mm. FIG. 7 is a projection view of the hexagonal bolt of the same bolt, FIG. 8 is a front view of the hexagonal bolt of the same bolt, and FIG. 9 is seen in the direction of the arrow along the line CC of FIG. A plan view, FIG. 10 is a front view of a hexagon socket head cap screw of the same bolt, and FIG. 11 is a plan view seen in the direction of the arrow along the line DD in FIG. FIG. 12 is a front view of a pan head machine screw of the bolt. A plurality of iris-shaped (lattice-shaped) concave grooves (7 ') with a constant width from the shaft (2') to the peripheral edge on the entire supporting surface (4 ') of the bolt are 1 to 5 mm, angle It is suitable to cross over 30 to 90 degrees, and it is desirable to form the concave and convex grooves in the depth range of 0.5 to 1 mm.

[0007]

[Effect of the device]

 If the locking bolts for fastening of the present proposal are used, conventional toothed washers, spring washers, etc. can be used together, and the effect of preventing unintended loosening after bolt fastening is increased.

[Brief description of drawings]

FIG. 1 is a projection view of a hexagon bolt according to an embodiment of the present invention.

FIG. 2 is a front view of a hexagon bolt which is an embodiment of the present invention.

FIG. 3 is a second view showing a lock surface structure of the lower surface of the bolt head.
It is the top view seen in the direction of the arrow along the AA line of a figure.

FIG. 4 is a front view of a hexagon socket head cap screw according to an embodiment of the present invention.

FIG. 5 is a fourth view showing the lock surface structure of the lower surface of the bolt head.
It is the top view seen in the direction of the arrow along the BB line of a figure.

FIG. 6 is a front view of a pan head machine screw according to an embodiment of the present invention.

FIG. 7 is a projection view of a hexagon bolt according to a third embodiment of the present invention.

FIG. 8 is a front view of a hexagon bolt according to a third embodiment of the present invention.

FIG. 9 is an eighth view showing a lock surface structure of the lower surface of the bolt head.
It is the top view seen in the direction of the arrow along the CC line of a figure.

FIG. 10 is a front view of a hexagon socket head cap screw according to an embodiment of the present invention.

FIG. 11 is a plan view showing the lock surface structure of the lower surface of the bolt head, as seen in the direction of the arrow along the line D-D in FIG. 4.

FIG. 12 is a front view of a pan head machine screw according to a third embodiment of the present invention.

[Explanation of symbols]

 1.1 '. Intersection 2.2 '. Shaft part 3.3 '. Head surface 4.4 '. Support surface 5.5 '. Edge 6.6 '. Screw processing part 7.7 '. Recessed portion 8.8 '. Convex portion 9.9 '. Special washer 10.10 '. Clamped material

Claims (3)

[Scope of utility model registration request] 1. A plurality of grooves (7) having a constant width extending from the shaft portion (2) to the peripheral edge (5) are provided on the entire supporting surface (4) of the screw and the bolt, and the groove (7) is fastened when the bolt is fastened. ) Deformation of the convex groove (8) provides an anti-slip effect, and by additionally using a special washer (9), the concave groove (7) convex of the special washer and the entire supporting surface (4) after bolt fastening An anti-loosening bolt characterized by having an anti-loosening effect by interference with the groove (8). 2. The locking bolt according to claim 1, wherein the concave groove (7) is provided in a radial shape with a constant width. 3. The locking bolt according to claim 1, wherein the concave groove (7) is provided in an iris shape (lattice shape) with a constant width.