Screw

Details Screw Screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/00 (2006.01) F16B 5/02 (2006.01) F16B 35/04 (2006.01) F16B 35/06 (2006.01) F16B 23/00 (2006.01) F16B 43/00 (2006.01)

Patent

CA 2140475

A screw, particularly a wood screw present a combination of a threaded cylindric stem (10) merging, over an inversely frustoconical part (16) with an enlarged diameter cylindric portion (20) which is integral with an underside of a large diameter washer section (23) which, in turn is integral with a shallowly convex head portion (25). The invention is intended for wood screws usually in the range of about 6 mm and provides a reduced chance of injury by providing a smooth merging with the flat surface on which the screw head is located. Also, the screw has an improved torque characteristics making it suitable for use with power screw driving tools.

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