Hydraulic hand jack

Details Hydraulic hand jack Hydraulic hand jack

1977-01-05

1978-03-07

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Fluid pressure

Vehicle attached

91402, B66F 324

Patent

active

040776085

ABSTRACT:
A hydraulic jack is disclosed, of the type comprising a ram having a head portion reciprocable in a cylinder between two cylinder ends, and sealing means carried on the ram head portion to provide a substantially fluid-tight seal between the ram and the cylinder interior surface. In this jack, an open sided pressure relief trough is formed in the interior surface of the cylinder adjacent one end to permit the flow of fluid past the sealing means when the head portion is located substantially adjacent the cylinder end and relief trough. Fluid bleeding action past the relief trough thus prevents forcing the ram head and sealing means against the cylinder end. When the jack is so constructed, the sealing means can include an elastomeric seal cup member which will not be damaged by its travel past the trough.

REFERENCES:
patent: 2456105 (1948-12-01), Berg
patent: 3685797 (1972-08-01), Orr
patent: 3818805 (1974-06-01), Johansson
patent: 3925985 (1975-12-01), Peterson

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