Lift-jack fluid motor for hydraulic lift trucks

Details Lift-jack fluid motor for hydraulic lift trucks Lift-jack fluid motor for hydraulic lift trucks

1977-02-24

1978-02-28

Maslousky, Paul E.

Motors: expansible chamber type

Working member position responsive motive fluid control

Venting expanding chamber

91454, 92142, F15B 1522, F15B 13042

Patent

active

040759318

ABSTRACT:
An expanding chamber hydraulic motor venting through a working member reduces the motor/stroke-limiting venting valve assembly to three simple components: a cup-shaped cylinder, an annular gasket at the open end of the cylinder, and undersize piston sufficiently loose in the cylinder to provide free-flow of hydraulic fluid therebetween but protruding through the gasket in a sealing fit; in operation, fluid pressure introduced by conventional means between the piston and cylinder can force the piston to extend from the cylinder only within a maximum stroke length limited by an annular groove around the piston which when it reaches the gasket vents the pressure past the gasket.

REFERENCES:
patent: 787136 (1905-04-01), Warren
patent: 1876024 (1932-09-01), Rosenberry
patent: 2624320 (1953-01-01), Williams
patent: 3818805 (1974-06-01), Johansson
patent: 3975986 (1976-08-01), Barth et al.

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