Screw and screwdriver

Details Screw and screwdriver Screw and screwdriver

2006-09-26

2006-09-26

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S441000

Reexamination Certificate

active

07111531

ABSTRACT:
A screw and a screwdriver of the present invention provide an easy insertion of screwdriver bits and the screwdriver conveys a large torque when fastening so that the screwdriver does not rise up from the screw and does not damage recesses to fasten and loosen the screw. The screw has a high strength structure for shear force. A plurality of recesses for the insertion of the bits of the screwdriver are disposed on a top face of a screw head of the screw. Engaging walls are disposed to engage with the bits between the recesses. The whole shape of the recesses has a tapered cross section. Vertical engaging faces are formed inside the recesses near an outer circumference in a fastening direction of the screw and extend to a thickness direction of the screw head. The vertical engaging faces are parallel to bisectors of the width of the engaging walls through a central axis. The screwdriver has the bits having the same shape as the recesses of the screw head with respect to the central axis. The bits have vertical engaging drive faces to engage with the vertical engaging faces.

REFERENCES:
patent: 2445525 (1948-07-01), Gulden
patent: 3122963 (1964-03-01), Borgesen
patent: 4355552 (1982-10-01), Gutshall
patent: 6164171 (2000-12-01), Kaneko et al.
patent: 6453781 (2002-09-01), Casino Lorite et al.
patent: 2111886 (1983-07-01), None
patent: S57-120714 (1982-07-01), None

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