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US 2009/0290955 A1Published application
Decorating strip
OwnerYi-Ho Lininventor
Life of this patent
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Abstract
A self-tapping screw comprises a self-tapping screw having a screw rod; one end of the screw rod being a head and another end thereof being a drilling head; the drilling head having two extending surfaces which are symmetrical; each extending surface being formed with a cutting teeth set; each cutting teeth set having a plurality of cutting teeth; each extending surface extending from a tip of the drilling head and having an approximate sector area; a notch being formed between each two adjacent radial edges of the two extending surfaces. Each cutting tooth is protruded from the extending surface.
Claims4
A self-tapping screw comprising:
- a self-tapping screw having a screw rod;
- one end of the screw rod being a head and another end thereof being a drilling head;
- the drilling head having two extending surfaces which are symmetrical;
- each extending surface being formed with a cutting teeth set;
- each cutting teeth set having a plurality of cutting teeth;
- each extending surface extending from a tip of the drilling head and having an approximate sector area;
- a notch being formed between each two adjacent radial edges of the two extending surfaces;
- wherein each cutting tooth is protruded from the extending surface.
5 more elements
Dependencies are inferred from the claim text.