Mechanical safety device for a lift

Details Mechanical safety device for a lift Mechanical safety device for a lift

1980-05-12

1982-05-25

Spar, Robert 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 82, 254 4R, B60S 1300

Patent

active

043312195

ABSTRACT:
A mechanical safety device for a lift which comprises a pillar and a carriage having arms for supporting a load, the carriage being moved up and down the pillar by a chain, wherein a pawl pivotally mounted to the carriage is adapted to be pivoted into a latch position wherein it engages with one of slots of a longitudinal slot plate mounted to the pillar, so as to prevent the carriage from filling down, and an unlatch position wherein it does not engage with the slot, and is biased to the latch position by a spring, wherein a lock lever pivotally mounted to the carriage is adapted to be pivoted into an engage position wherein it locks an action plate connected to the pawl in the unlatch position, and a disengage position wherein it unlocks the action plate in the latch position, and is biased to the engage position by a spring, and wherein a push device which is movably mounted to the carriage and is coupled to one end of the chain, pushes the lock lever so that the lock lever may be pivoted into the disengage position when the chain breaks, thereby locking the carriage by the pawl.

REFERENCES:
patent: 706644 (1902-08-01), Edwards
patent: 743258 (1903-11-01), Dolbey
patent: 884908 (1908-04-01), Dorsey
patent: 931211 (1909-08-01), Moulton
patent: 948175 (1910-02-01), Kantor
patent: 1171243 (1916-02-01), Prokop

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