Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1977-02-18
1978-02-28
Saifer, Robert W.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66F 728
Patent
active
040761045
ABSTRACT:
A safety latch preventing inadvertent lowering or dropping of an automotive hoist by means of a torsionally biased pawl shaft that automatically self engages with a lateral notch located in the lift at hoist operating height. The backside of a vertically movable gear rack attached to the hoist includes the pawl notch near its lower end and which when raised cooperates with the pawl shaft for effecting a latching relation therewith. The pawl shaft is slotted to embrace the gear rack and is manually releasable for permitting hoist descent by a partial rotation which in one embodiment is effected by manually shifting a bi-stable locking rod. Reset for latching on subsequent ascent of the gear rack is effected by descending engagement of the hoist bolster against the bi-stable locking rod. In an alternative embodiment release is obtained by raising a lift pin which similarly effects partial rotation of the biased pawl shaft. An auxiliary latch in the alternative embodiment prevents self-reset of the pawl shaft until after the notch descends a distance beyond which the pawl shaft and notch could otherwise relatch.
REFERENCES:
patent: 2059059 (1936-10-01), Thompson
patent: 2201189 (1940-05-01), Makaroff et al.
patent: 2750004 (1956-06-01), Harrison
patent: 2849084 (1958-08-01), Hott et al.
patent: 2954100 (1960-09-01), Harr
patent: 3934680 (1976-01-01), Bishop
Bishop Burton DeWolfe
Murray Lawrence E.
Dresser Industries Inc.
Rowland James L.
Rubin Daniel
Saifer Robert W.
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