Fixed limit lifting jack

Details Fixed limit lifting jack Fixed limit lifting jack

1977-10-19

1978-12-26

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

B66F 504

Patent

active

041312635

ABSTRACT:
A lifting jack with its elevating linkage has an elongated base supported on wheels and a hydraulic ram horizontally disposed in the base. A block which is a structural part of the base incorporates a hydraulic reservoir, a pump, valving, and a lift-lower control. A single handle serves both to actuate the pump and manipulate the lift-lower control. An overload release valve which can be factory-adjusted to limit the load which the jack can lift is interiorly mounted and combined with the lift-lower control to inhibit tampering which could inadvertently overload the jack.

REFERENCES:
patent: 2219903 (1940-10-01), Pfauser
patent: 2702988 (1955-03-01), Rhoads et al.
patent: 4018421 (1977-04-01), Tallman

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