Screw

Details Screw Screw

1976-09-10

1978-02-14

Britts, Ramon S.

Bridges

145 50R, F16B 2300

Patent

active

040732100

ABSTRACT:
A screw is described having a head and a stem portion, the head portion having a slot formed therein of such shape as to ensure maximum surface engagement between a screwdriver bit and the side walls defining the slot. The bit of the screwdriver entering the slot has a shape complementary to that of the bottom wall defining the depth of the slot in the head portion.

REFERENCES:
patent: 2015878 (1935-10-01), Trotter
patent: 2180633 (1939-11-01), Holt
patent: 2258326 (1941-10-01), Holt
patent: 2289561 (1942-07-01), West

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