Tools – Wrench – screwdriver – or driver therefor – Wheel or endless track operated
Patent
1978-03-17
1979-04-17
Bonck, Rodney H.
Tools
Wrench, screwdriver, or driver therefor
Wheel or endless track operated
85 9R, 85 45, 85 61, 145 50A, B25B 1348, F16B 3102
Patent
active
041494342
ABSTRACT:
A screw having an annular socket formed concentrically in the outer surface of its head, with at least a pair of radial walls in said socket, and adapted to be used with a pair of special tubular drivers adapted to be inserted coaxially into said socket and having its side walls transversely slotted to engage over the radial walls, one of the drivers being of a diameter to engage weakened portions of the walls, which by breaking out, limit the torque applicable to set the screw, and the other of the drivers being of a diameter to engage stronger portions of the radial walls for applying greater torque to remove the screw. Both drivers are capable of frictionally gripping and holding the screw for convenience of inserting or removing the screw into or from positions of difficult access.
REFERENCES:
patent: 1397876 (1921-11-01), Meldal
patent: 2394104 (1946-02-01), Rankin
patent: 2660083 (1953-11-01), Tyson
patent: 2813450 (1957-11-01), Dzus
patent: 3449988 (1969-06-01), Gallo
patent: 3800841 (1974-04-01), Lindberg
patent: 3865007 (1975-02-01), Stanback
patent: 3963322 (1976-06-01), Gryctko
Bonck Rodney H.
Hamilton John A.
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