Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1988-12-09
1990-05-22
Rolla, Joseph J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 20, 187 27, 187 73, 187 93, 414921, 254378, 74164, B66B 920
Patent
active
049269739
ABSTRACT:
A lightweight frame supports a wheelchair platform for up and down movement between four vertical standards, one at each corner. A lifting mechanism includes a winch supported between two of the standards and connected to the platform by cables which pass over pulleys mounted in an upper cross bar pivotally secured and extending between the two posts with the pivot being offset from the longitudinal axis of the crossbar thereby giving a camming or offset partial rotational movement. The winch includes a one way clutch which is disengaged when the platform is elevated but engages automatically as soon as the platform starts to descend thus locking a brake drum to the winch. A brake band extends around the drum and is operatively connected to an offset pin on the upper crossbar by rigid links so that as soon as the platform starts to descend, the brake is automatically applied thus preventing inadvertent downward movement of the platform unless the friction or resistance between the drum and band is overcome by actuation of the winch for controlled lowering of the platform. Wear is automatically compensated for by the linkage between the brake pad and the pin on the upper cross bar which acts in a camming fashion with the offset pivot mounting thereof.
REFERENCES:
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patent: 3435915 (1969-04-01), Villars
patent: 3874477 (1975-04-01), Hedstrom
patent: 3994476 (1976-11-01), Van Gennep
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patent: 4252491 (1981-02-01), Hock
patent: 4347030 (1982-08-01), Kingston
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patent: 4499970 (1985-02-01), Hussey
patent: 4576539 (1986-03-01), Williams
DeRosa Kenneth
Rolla Joseph J.
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