Fastener and driving tool

Details Fastener and driving tool Fastener and driving tool

1994-04-29

1995-08-08

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81436, 411407, B25B 2308

Patent

active

054388953

ABSTRACT:
A fastening system comprises a driving tool formed with a rectangular-shaped bit at its driving end, and a fastener such as a screw whose head is formed with a recess defining a central slot and four spaced undercuts each having parallel upper and lower walls and a side wall perpendicular thereto. The bit of the driving tool is inserted within the central slot of the recess and then rotated such that the side edges of the rectangular bit contact the side walls of two of the undercuts, and the top wall and bottom surface of the bit frictionally engages the upper and lower walls of such undercuts. Frictional engagement between the undercuts and the driving tool bit provides a positive, temporary interlock therebetween, and contact between the side edges of the driving tool and side walls of the undercuts permits the transfer of torque over a large surface to reduce wear.

REFERENCES:
patent: 132946 (1872-11-01), Armstrong
patent: 1056095 (1913-03-01), Groos
patent: 1797390 (1931-03-01), Wood
patent: 2304704 (1942-12-01), O'Leary
patent: 2677985 (1954-05-01), Vaughn
patent: 2684094 (1954-07-01), Lissy
patent: 2792039 (1957-05-01), Wing
patent: 4130152 (1978-12-01), Bolen
patent: 4311071 (1982-01-01), Bassell
patent: 4339971 (1982-07-01), Zatorre
patent: 4497225 (1985-02-01), Vaughn
patent: 4538486 (1985-09-01), Lutrat
patent: 4571039 (1986-02-01), Desjardins
patent: 4936172 (1990-06-01), Jackson

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