Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Strip or slat structure
Patent
1983-01-13
1985-02-19
Larson, Lowell A.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Strip or slat structure
72177, 72187, 72379, B21D 5300
Patent
active
044999380
ABSTRACT:
A metal slat for use in a venetian-type blind including an embossed rib formed at each narrowed slat material region adjacent the cord receiving slots. The slat also includes a decorative weave pattern comprising a plurality of separated longitudinal rows of embossed ribs formed on the slat in a continuous in-and-out pattern.
Also disclosed is apparatus for forming the embossment weave pattern concurrent with forming the crown configuration of the slat. The apparatus includes a first rotary die arrangement for prestretching of at least one localized region of a continuous flat metal strip passing therethrough, a second rotary die arrangement for simultaneously forming the strip into a crown configuration and forming the embossment pattern therein, and a third die arrangement for compensating out of the strip any bow, side curve or twist.
REFERENCES:
patent: 2103788 (1937-12-01), Mohrfeld
patent: 2567256 (1951-09-01), Toti et al.
patent: 3168028 (1965-02-01), Booth et al.
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