Screw and screwdriver therefor

Details Screw and screwdriver therefor Screw and screwdriver therefor

1990-09-05

1993-07-06

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81436, B25B 2314

Patent

active

052244024

ABSTRACT:
A screw includes a socket adapted to receive the tip of a screwdriver. The socket is tapered and formed by a plurality of sides interconnected by rounded corners. Each side is configured as a surface of a segment of a cone having a cone angle of at least three degrees. The screwdriver tip is configured correspondingly to the screw socket. The screwdriver may be mounted in a power driven rotary arm and spring-biased, whereby a tightened screw applies a rearward reaction force to the screwdriver, causing the tip to be displaced from the screw socket and thereby limit the torque applied to the screw.

REFERENCES:
patent: 2921984 (1959-12-01), Ansingh
patent: 4700442 (1987-10-01), Lahm
patent: 4827811 (1989-05-01), Vickers
patent: 4834597 (1989-05-01), Andersson et al.

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