Hydraulic hand jack

Details Hydraulic hand jack Hydraulic hand jack

B - Operations, Transporting

66

F

254/153

B66F 3/42 (2006.01) B66F 3/32 (2006.01)

Patent

CA 1064465

HYDRAULIC HAND JACK Abstract of the Disclosure 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 sub- stantially 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.

289937

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