Securing devices

Details Securing devices Securing devices

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 37/12 (2006.01) E01B 9/16 (2006.01)

Patent

CA 2143755

A spiral member (140) for improving the grip of screws (20) in wood- en or other receptive substrates is disclosed. The spiral member (140) has a central axial drive pin by which it can be driven into a thread in the recep- tive substrate and has an improved cross section providing wings or protu- berances (190, 191) extending out past the side surfaces of the cross section. The spiral member (190) has an outwardly facing triangular apex (174) which bites into the old thread whilst the wings (190, 191) bear upon the flanks of the screw thread of the screw inserted (20) into the spiral member (140) improving the grip.

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