Patent ID: 7207248
Filing Date: 2007-04-24
Classification: F16B

Abstract:
1. A threaded screw fastener adapted to be rotatably driven into a substrate, comprising: a threaded shank portion defined around a longitudinal axis; a head portion formed upon one end of said threaded shank portion, wherein said head portion comprises an underlying washer member having a peripherally extending edge portion disposed within a radially outwardly extending plane with respect to said longitudinal axis of said threaded shank portion, and an overlying dome-shaped circumferentially extending downwardly sloped surface portion extending downwardly toward said underlying washer member such that first peripheral edge portions of said downwardly extending overlying domed surface portion meet with second peripheral edge sections of said peripherally extending edge portion of said underlying washer member which are disposed within said radially outwardly extending plane; and dual drive means integrally formed upon said head portion of said threaded screw fastener for permitting said threaded screw fastener to be rotatably driven into a substrate by either one of two different types of rotary drive tools when either one of the two different types of rotary drive tools is respectively engaged with a corresponding one of said dual drive means integrally formed upon said head portion of said threaded screw fastener.