Patent ID: 8858145
Filing Date: 2014-10-14
Classification: F16B

Abstract:
1. A fastener capable of speedily screwing comprising: a shank, with a head disposed at one end of said shank, with a drilling portion disposed at another end of said shank opposite to said head, and with a plurality of threads spirally disposed on said shank; with said head including a top surface and a bottom surface extended downward from said top surface; wherein a plurality of blocks is disposed on said bottom surface, wherein an accommodating area is formed between any two adjacent blocks; with each block including a first wall arranged at one side of said accommodating area and extended upward from said bottom surface, a second wall extending from said first wall to another side of another adjacent accommodating area, and a cutting edge formed at a convergence of said first wall and said second wall; with said second wall tapering gradually from said top surface to said shank, with a third wall formed on said second wall and extended from said cutting edge to reach said other side of said other adjacent accommodating area; wherein each accommodating area defines a surface disposed between a pair of said blocks extending radially outward in a sloped manner to a periphery of said top surface, and wherein said second wall is directed to a cambered surface.