Screw unit to join semi-rigid mats together
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United States of America Patent
Stats
-
Apr 17, 1990
Grant Date -
N/A
app pub date -
Mar 29, 1989
filing date -
Apr 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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Cited Art Landscape
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