Patent ID: 7798756
Filing Date: 2010-09-21
Classification: F16B

Abstract:
1. A screw with waved thread comprising: a head; a shank connecting to said head with a drilling member formed opposite to the said head; and a thread spiraling on said shank and having a first threaded section disposed near said head and a second threaded section disposed immediately following said first threaded section; wherein, each of said first and said second threaded sections including thread units, on each of which plurality of interlaced thread segments are disposed; each said thread segment having an upper flank and a lower flank both extending from said shank and a peak converged by said upper flank and said lower flank; a continuous wave-shaped directrix being defined around said shank as a base line for said second threaded section standing thereupon, and said peaks on said thread unit of said second threaded section being disposed in a wave shape of said directrix; said upper flanks and said lower flanks on said thread unit of said second threaded section being disposed in a wavy arrangement along said wave-shaped directrix.