Fluid-operated cylinder with cushioning flow rate control valve

Details Fluid-operated cylinder with cushioning flow rate control valve Fluid-operated cylinder with cushioning flow rate control valve

1986-02-27

1987-11-17

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 9R, 91399, 91405, B66F 922, F15B 1522

Patent

active

047067810

ABSTRACT:
A fluid-operated cylinder to be used as a load lifting cylinder includes a cylinder casing defining a cylinder bore between two opposed ends, one of which ends is provided with a fluid supply/discharge port, a piston unit having a piston element and a piston rod, the piston unit being axially movably arranged in the cylinder bore of the cylinder casing, and a flow rate control valve unit axially movably mounted in the piston element so as to cause a gradual change in a flow rate of working fluid throughout a predetermined amount of piston stroke when the piston unit starts to move out of the cylinder casing and comes to a stop at a bottom position in the cylinder casing, thereby cushioning shock occurring in the fluid-operated cylinder.

REFERENCES:
patent: 1141447 (1915-06-01), Dellwitz
patent: 2078780 (1937-04-01), Slater
patent: 2951558 (1960-09-01), Schuster
patent: 3023739 (1962-03-01), Dickinson, Jr. et al.
patent: 3232180 (1966-02-01), Deschenes
patent: 3974910 (1976-08-01), Papai
patent: 3998132 (1976-12-01), Rasigade
patent: 4207802 (1980-06-01), Homuth
patent: 4250793 (1981-02-01), Berg

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