Patent ID: 7862280
Filing Date: 2011-01-04
Classification: F16B

Abstract:
1. A saw tooth screw comprising: a head; a shank with a shank axial line longitudinally extending from said head; a first thread section, and a second thread section, wherein, said first thread section spirally extends from said head along the shank axial line of said shank to said second thread section; each thread of said first and said second thread sections having an upper flank and a lower flank disposed opposing thereto; said thread in said first thread section being interrupted by a plurality of slots inclined with respect to said shank axial line by an angle which divide said thread into thread segments; each of said thread segments having a first inclined surface parallel to a second inclined surface; said thread in said second thread section forming a plurality of recesses depressed on said upper and said lower flanks, which radially extend from said shank to an outer edge of said thread.