Patent ID: 6328516
Filing Date: 2001-12-11
Classification: F16B

Abstract:
A screw comprising a shank portion (20), a thread (21), a conical tip (22), and at least one cutting edge (23), wherein(a) the thread (21) extends at least over part of the length of the shank portion and over the entire length of the tip (22) of the screw,(b) one or more fins (24) project beyond the core diameter (1) of the shank portion (20), the leading edge of each of said one or more fins being circumferentially spaced from the trailing edge of the adjacent one of said one or more fins;(c) the cutting edge (23) is formed on said at least one or more fins (24),(d) said at least one or more fins (24) defining a smaller angle of inclination (13) than the thread (21) with the longitudinal axis of the screw, and(e) the cutting edge (23) of said at least one or more fins extending over part of the conical tip (22) up to a finless end portion (26) of the said conical tip (22).