Screw

Details Screw Screw

1995-12-20

1997-10-07

Meyers, Steven N.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Head driving structure

411402, F16B 2300

Patent

active

056740360

ABSTRACT:
A screw having a tool slot in the upper surface of its head, wherein the tool slot is defined by a plurality of circularly arched upright grooves and a plurality of flat upright wall portions, which are alternatively arranged around the border of the tool slot for permitting a hex wrench and a grooved wrench to be alternatively fitted into the tool slot and driven to turn the screw; the head is made of oval shape having smoothly curved side wall portions and flat side wall portions alternatively arranged together and adapted for turning by open-end wrenches of different sizes.

REFERENCES:
patent: 2248695 (1941-07-01), Bradshaw
patent: 2448213 (1948-08-01), Doonan
patent: 3134292 (1964-05-01), Walton
patent: 4384812 (1983-05-01), Miyagawa
patent: 4444301 (1984-04-01), Granberry
patent: 4459074 (1984-07-01), Capuano
patent: 5137407 (1992-08-01), Yamamoto
patent: 5401133 (1995-03-01), Kuchler
UNBRAKO Metric Socket Screws, 1975 Catalog, All Pages.

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