Washer with convexly curved surface

Details Washer with convexly curved surface Washer with convexly curved surface

1988-09-15

1990-03-20

Wilson, Neill R.

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

Washer structure

411533, 411544, 405259, F16B 4300

Patent

active

049096915

ABSTRACT:
In a washer, a central opening is provided for receiving a screw. This large surface-area washer comprises a flat edge area extending so as to be closed with a convexly curved portion adjoining the latter. The central opening is defined by a wall which is conically shaped or comprises one or more steps. The washer serves to fasten parts to an underlying structure, particularly to fasten single-layer or multiple-layer roofing with insulating material on a fixed underlying structure.

REFERENCES:
patent: 2334406 (1943-11-01), Gray
patent: 3090203 (1963-05-01), Durget
patent: 3238731 (1966-03-01), Seifert et al.
patent: 3478523 (1969-11-01), Reusser et al.
patent: 4095430 (1978-06-01), Hannan
patent: 4102239 (1978-07-01), Dallas
patent: 4410296 (1983-10-01), Unrug
patent: 4467581 (1984-08-01), Francovitch
patent: 4518282 (1985-05-01), Wilcox et al.

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