Washer for screws

Details Washer for screws Washer for screws

1990-08-14

1993-04-13

Wilson, Neill R.

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

Washer structure

411156, 411368, 411915, F16B 3300, F16B 4300

Patent

active

052016277

ABSTRACT:
A ring-shaped washer (10) especially for wood screws (28) has an external circumferential edge area, which is directed downwards and cuts the wood (26) when the washer is being driven into it. At the same time the wood below the washer is compressed. This primarily serves to avoid a splitting up of the wood when screwing in the wood screw (28) and at the same time to increase the strength of the screwed connection.

REFERENCES:
patent: 436737 (1890-09-01), Lewis
patent: 1343209 (1920-06-01), Gwyer
patent: 1793453 (1931-02-01), Barili
patent: 1814502 (1931-07-01), Barwood
patent: 2524911 (1950-10-01), Horatschke et al.
patent: 2769606 (1956-11-01), Larson
patent: 3315720 (1967-04-01), Gutshall
patent: 3882752 (1975-05-01), Gutshall

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