Method and device for controlling a lift cylinder, especially of working machines
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United States of America Patent
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Mar 9, 2004
Grant Date -
Jan 2, 2003
app pub date -
Jul 30, 2002
filing date -
Feb 4, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
By means of a method and a device for controlling a lift cylinder (2) of working machines, wherein the hydraulic oil from the pressure cylinder space (12) is forced via a control element (3) into the suction cylinder space (11) during lowering by an external force, it is possible in particular to achieve automatic changeover between normal operation and an operating condition in which an additional force in vertical direction can be exerted. This is achieved in particular by the fact that, at a first predetermined force, the hydraulic oil arriving from the pressure space (12) is forced via a check valve (15) in control element (3) through the distribution channel (5) pressurized by the hydraulic pump (7) and from this into the suction cylinder space (11), the feed flow of the hydraulic pump (7) being shut off by a pressure-controlled stop valve (8), this stop valve (8) opening and the check valve (15) closing in response to a pressure drop, so that, by means of the pump (7), an additional force can be exerted on the suction cylinder space (11).
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