Fastening device
OwnerWen-Pin Huanginventor
Life of this patent
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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.
Claims3
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.
Dependencies are inferred from the claim text.