Fluid cylinder cushioning system

Details Fluid cylinder cushioning system Fluid cylinder cushioning system

1988-06-16

1989-09-05

Look, Edward K.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91396, 92 85B, 277207R, F15B 1522

Patent

active

048627860

ABSTRACT:
A cushioning system for a fluid power cylinder includes a first passage for the flow of fluid to and from the space between the piston and end cap closure of the cylinder, and a second passage including a throttling valve for throttling the flow of fluid from the space as the piston approaches the end cap closure to cushion the piston. An O-ring seal is centered in the first passage and relative to a seal actuating sleeve on the piston by a plurality of spaced projections extending outwardly from the O-ring. An improved method of forming the valve seat of the throttling valve is also disclosed, wherein the second passage is deformed to substantially conform to the width and shape of the throttling valve and provide substantially zero clearance between the valve and its valve seat.

REFERENCES:
patent: 2804052 (1957-08-01), Halladay et al.
patent: 2853974 (1958-09-01), Hewitt
patent: 3267815 (1966-08-01), Ortman et al.
patent: 3303746 (1967-02-01), Schmoeger
patent: 3440930 (1969-04-01), Olson
patent: 3805672 (1974-04-01), Pekrul
patent: 4296675 (1981-10-01), Gies
patent: 4301714 (1981-11-01), Stenlund et al.
patent: 4458717 (1984-07-01), Boland

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