Screw
First Claim
1. A screw comprising:
- a shank including an insertion tip and a head end spaced from the insertion tip along a longitudinal axis, with the shank further including a straight portion between the insertion tip and the head end, with the head end being greater than the straight portion in an outer diameter and including an upper portion and a lower portion which is adjacent to and tapered toward the straight portion, with the upper portion provided with a pointed cutting portion circumferentially designed at a bottom thereof, with a plurality of anti-screw-out teeth protruding from a circumferential surface of the lower portion, with each anti-screw-out tooth including a guide face and a stop face, with an included angle between the guide face and the circumferential surface of the lower portion being between 90 and 180 degrees, with a recessed channel formed between the stop face and the circumferential surface of the lower portion; and
a first thread spirally disposed on the straight portion of the shank and including a plurality of asymmetrical thread convolutions, with each of the asymmetrical thread convolutions having a first cutting face facing onto the insertion tip and a second cutting face backing onto the insertion tip, with an included angle between the first cutting face and a horizontal axis perpendicular to the longitudinal axis being between 25 and 45 degrees, with an included angle between the second cutting face and the horizontal axis being between 3 and 23 degrees.
1 Assignment
0 Petitions
Accused Products
Abstract
A screw includes a shank having an insertion tip and a head end which has an upper portion with a cutting portion and a lower portion from which a plurality of anti-screw-out teeth protrude. Each anti-screw-out tooth includes a guide face and a stop face intersecting a circumferential surface of the lower portion for development of a recessed channel. A first thread on the shank includes a plurality of asymmetrical thread convolutions each having a first cutting face facing onto the insertion tip and a second cutting face backing onto the insertion tip. The first cutting face and a horizontal axis form an included angle between 25 and 45 degrees. The second cutting face and the horizontal axis form an included angle between 3 and 23 degrees. The screw is in favor of surface flatness of a to-be-connected plank and pull-out as well as anti-screw-out properties of the screw.
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Citations
15 Claims
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1. A screw comprising:
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a shank including an insertion tip and a head end spaced from the insertion tip along a longitudinal axis, with the shank further including a straight portion between the insertion tip and the head end, with the head end being greater than the straight portion in an outer diameter and including an upper portion and a lower portion which is adjacent to and tapered toward the straight portion, with the upper portion provided with a pointed cutting portion circumferentially designed at a bottom thereof, with a plurality of anti-screw-out teeth protruding from a circumferential surface of the lower portion, with each anti-screw-out tooth including a guide face and a stop face, with an included angle between the guide face and the circumferential surface of the lower portion being between 90 and 180 degrees, with a recessed channel formed between the stop face and the circumferential surface of the lower portion; and a first thread spirally disposed on the straight portion of the shank and including a plurality of asymmetrical thread convolutions, with each of the asymmetrical thread convolutions having a first cutting face facing onto the insertion tip and a second cutting face backing onto the insertion tip, with an included angle between the first cutting face and a horizontal axis perpendicular to the longitudinal axis being between 25 and 45 degrees, with an included angle between the second cutting face and the horizontal axis being between 3 and 23 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification