A screw having a head with concave underside

Details A screw having a head with concave underside A screw having a head with concave underside

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 35/06 (2006.01) F16B 33/00 (2006.01) F16B 43/00 (2006.01)

Patent

CA 2478635

An integrally formed screw, such as a wood screw has a threaded cylindric stem and a head (9). At least a part (25) of the head (9) is shallowly convexly curved (25) and is provided with a screwdriver recess (-26). The head (9) has an 5 annular, shallowly concave underside (22) adapted to accommodate a relatively soft, polymeric washer (27).

L'invention concerne une vis d'un seul tenant, telle qu'une vis à bois, comprenant une tige filetée cylindrique et une tête (9). Au moins une partie (25) de la tête (9) de la vis est légèrement convexe (25) et comporte une empreinte à tournevis (26). La tête (9) de la vis comprend une face inférieure annulaire légèrement concave (22) conçue pour recevoir une rondelle polymère (27) relativement lisse.

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