IP Library › Granted Patent US 12680569
Granted Patent B2
US 12680569 · App. 18/241,117 · Granted Jul 14, 2026

Fastening device

Inventor: Wen-Pin Huang (Kaohsiung, TW)
F16B39/10F16B25/0057F16B35/048F16B39/36
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Quick Facts
Patent No.
US 12680569
App. No.
18/241,117
Granted
Jul 14, 2026
Kind
B2
Abstract

A fastening device includes a reverse self-tapping screw including a nut and a threaded shank having a tapered section and a threaded section wherein the tapered section is a reverse self-tapping screw formed on the threaded shank adjacent to the nut and has a length of d/4 to d/3; the reverse self-tapping screw is a screw having a tapered surface of 1.5×d/16; and the threaded section is a forward threaded screw; and an anti-loosening assembly including an internally threaded fastening element and a retaining ring. The internally threaded fastening element includes a nut member and an anti-loosening member having a plurality of spiral constriction grooves. The spiral constriction grooves have an inclined angle of 30°-60° with respect to an axis thereof, and an annular groove for securely receiving the retaining ring.

Claims (7)

1 . A fastening device, comprising:

a reverse self-tapping screw including a head and a threaded shank having a tapered section and a threaded section wherein the tapered section is a reverse self-tapping screw formed on the threaded shank adjacent to the head and has a length of d/4 to d/3, where d is a diameter of the threaded shank; and the threaded section is a forward threaded screw; and

an anti-loosening assembly including an internally threaded fastening element and a retaining ring;

wherein the internally threaded fastening element includes a nut member and an anti-loosening member having a plurality of spiral constriction grooves; and

wherein the spiral constriction grooves have an inclined angle of 30°-60° with respect to an axis thereof, and an annular groove for securely receiving the retaining ring.

2 . The fastening device of claim 1 , wherein the tapered section of the threaded shank is hardened by means of high frequency heat treatment.

3 . The fastening device of claim 1 , wherein the anti-loosening member is subjected to a heat treatment method, wherein the constriction grooves are constricted by forging and the extent of the constriction is d/32, and wherein the anti-loosening member has a diameter of d−d/16.