Safety device for lifting apparatus

Details Safety device for lifting apparatus Safety device for lifting apparatus

1986-01-02

1986-12-02

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

254 93R, B60P 148, B66F 324

Patent

active

046259449

ABSTRACT:
A safety device is provided for use with a lifting apparatus having a main lifting mechanism for lifting, lowering and supporting a load. The safety device includes a cylinder operatively connected to the lifting apparatus and capable of lifting, lowering and supporting the load supported by the lifting mechanism. The safety device further includes a counterbalance holding valve operatively connected to the cylinder for preventing the lowering of the load supported by the lifting apparatus except in response to the application of hydraulic pressure thereto.

REFERENCES:
patent: 2355341 (1944-08-01), Trimbach
patent: 2836054 (1958-05-01), Brauer
patent: 2920773 (1960-01-01), Knabe
patent: 2937003 (1960-05-01), Croll
patent: 2956408 (1960-10-01), Fowler
patent: 3341042 (1967-09-01), Carder
patent: 3472547 (1969-10-01), London
patent: 3758076 (1973-09-01), Tranchero
patent: 4223693 (1980-09-01), Kosarzecki

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