Screw unit to join semi-rigid mats together

Details Screw unit to join semi-rigid mats together Screw unit to join semi-rigid mats together

1989-03-29

1990-04-17

Wilson, Neill R.

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

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

Resiliently flexible

411413, 411438, F16B 3500

Patent

active

049175548

ABSTRACT:
A screw unit with a shaft (1) and an enlargement at one end, to join together semi-rigid mats, consisting for example of mineral fibers or foam material, has the shaft (1) consisting of a wire helix (W) wound in corkscrew fashion and continuing at the one end as a spiral winding forming the headpiece (2), with the helical slope (.alpha.) of the wire helix (W) adjacent the headpiece (2) being smaller than the helical slope (.beta.) in the region of a point (5) at the other end of the shaft (1).

REFERENCES:
patent: 2138919 (1938-12-01), Herman
patent: 2391792 (1945-12-01), Miles et al.
patent: 2755699 (1956-07-01), Forster
patent: 4437286 (1984-03-01), Maguire
patent: 4762453 (1988-08-01), DeCaro

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