Control circuit for a cylinder allowing flow between an upper an

Details Control circuit for a cylinder allowing flow between an upper an Control circuit for a cylinder allowing flow between an upper an

1990-03-30

1991-11-19

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91436, 91440, 60474, F15B 13042

Patent

active

050656643

ABSTRACT:
A hydraulic control circuit arrangement for a single-acting cylinder provided with bottom and rod chambers separated by a piston having a piston rod extending the rod chamber, the arrangement including a directional control valve for controlling a supply of an operating oil from a hydraulic pump to the bottom chamber and an evacuation of the operating oil from both the bottom and rod chambers, a first pilot-operated valve for controlling the type of operation of the single-acting cylinder from a ram type to a piston type, and vice versa, in response to a change in an extent of a load applied to the single-acting cylinder during the lifting thereof, a short-circuiting conduit arranged between the bottom and rod chambers of the cylinder to short-circuit a flow of the operating oil from the bottom to rod chamber, and vice versa, a second pilot-operated valve located in the short-circuiting conduit to control the short-circuiting of the flow of operating oil, and a flow control valve for generating a pressure in the bottom chamber of the single-acting cylinder to thereby promote the short-circuiting of the flow of operating oil from the bottom to rod chamber of the single-acting cylinder during the lowering of the cylinder.

REFERENCES:
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patent: 4657471 (1987-04-01), Shinoda et al.
patent: 5014734 (1991-05-01), Smith

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