Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Patent
1990-08-21
1991-12-24
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
1601761, E06B 938
Patent
active
050743490
ABSTRACT:
A venetian blind tilt drum eliminates the separate staples, crimped sleeves and bullet-like members normally used to connect the vertical legs of a cord tilt ladder to the drum. The tilt drum is of one-piece construction and includes a top surface from which preferably three cord impalement integral barbs extend. A first barb of generally pyramidal shape is positioned on an upper top surface of the drum on the drum vertical centerline, parallel to the longitudinal axis of the drum and with a pointed vertex of the barb extending above that axis. A pair of similar second and third barbs also integral with the drum are offset from the drum vertical centerline, with each pointed vertex also parallel to the drum longitudinal axis but extending in an opposite direction than the first barb. Depending on the particular tilt ladder construction the upper distal ends of the tilt ladder both may be impaled on the first barb or one distal end impaled on the second barb and the other distal end impaled on the third barb. Each barb may includes at least one notch adjacent to its base so as to retain portions of a pierced distal end or ends securely on the tilt drum. After the vertical legs of the tilt ladder have been affixed to the drum barbs, the drum is rotatable by rotary action of a blind slat tilt wand, tilt gearing and a tilt rod shaft.
REFERENCES:
patent: 774188 (1904-11-01), Lamb
patent: 812412 (1906-02-01), Downs et al.
patent: 1969924 (1934-08-01), Carter et al.
patent: 2821247 (1958-01-01), Satosky
patent: 2831536 (1958-04-01), Lorentzen
patent: 2931482 (1960-04-01), Bishop
patent: 4945971 (1990-08-01), Ivarsson et al.
Johnson Blair M.
Levolor Corporation
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