Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1989-10-12
1991-08-06
Olszewski, Robert P.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
1601961, B66B 1300
Patent
active
050369539
ABSTRACT:
A manually operated door for an elevator cab opening includes a top track, a bottom track, and a plurality of door panel assemblies supported by the top track. Each of the tracks includes a front portion parallel to the cab opening, a curved portion adjacent the front portion and undergoing a right angle bend, and a side portion adjacent the right angle bend, parallel to a side wall of the cab. The top track includes inner and outer parallel and concentric track portions. A three wheeled carriage is provided for riding in the top track, whereby the door panels can readily make tight radius turns in being moved from open to closed and vice versa. Door assemblies are guided by the top and bottom tracks. An individual door assembly includes the three-wheeled carriage, a hinge pin supported by the carriage and extending down to the bottom track and guided thereby, and a tangential roller supported by the hinge pin. The tangential roller engages a complementary guide portion in the top track, whereby movement of the door assemblies through the curved track portion is facilitated. Horizontal support bars and right angle brackets are used to pivotally connect the door panels to the hinge pins. When the door assembly is moved through the right angle bends, the carriage, the hinge pin, the tangential roller, the horizontal support bars, and the right angle brackets turn on the same vertical axis defined by the longitudinal axis of the hinge pin.
REFERENCES:
patent: 1180156 (1916-04-01), Kranebiel
patent: 1654857 (1928-01-01), Brady
patent: 1735153 (1929-11-01), Bouton
patent: 2689003 (1954-09-01), Helbert et al.
patent: 3003551 (1961-10-01), Ferris
Bloom Leonard
Noland Kenneth
Olszewski Robert P.
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