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US 2009/0214321 A1Published application
Self-drilling screw and method of making the same
AssigneeSun Through Industrial Co., Ltd.
InventorsHsi-Yuan WANG, Chih-Chang WANG
Life of this patent
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Abstract
A self-drilling screw includes a head portion, a shank portion having an externally threaded section, and a drilling portion opposite to the head portion. The drilling portion has a main section and a tip section, two flutes extending helically through the main and tip sections, and two lands extending helically between the flutes. Each of the lands has a tapered face extending in the tip section and between the flutes, and a drilling edge formed on one end of the tapered face.
Claims6
A method of making a self-drilling screw, comprising:
- (a) forging a rod-shaped blank to form a head portion, a drilling portion opposite to the head portion, and a shank portion between the head portion and the drilling portion, the drilling portion having two flutes formed respectively on two opposite sides of the drilling portion, and two lands each formed between the flutes;
- (b) twisting the drilling portion by clamping the shank portion and an end section of the drilling portion, and by rotating the shank portion and the end section relative to each other, so that the flutes and the lands are twisted to extend helically;
- and
- (c) forming an externally threaded section on the shank portion of the blank.
1 more element
A self-drilling screw comprising:
- a head portion;
- a shank portion having an externally threaded section;
- and
- a drilling portion opposite to said head portion, said drilling portion having a main section and a tip section, two first flutes extending helically through said main and tip sections, and two lands extending helically between said first flutes, each of said lands having a tapered face extending in said tip section and between said first flutes, and a drilling edge formed on one end of said tapered face.
1 more element
Dependencies are inferred from the claim text.