Energy recovery device
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United States of America Patent
Stats
-
Feb 2, 1999
Grant Date -
N/A
app pub date -
Apr 21, 1997
filing date -
Oct 31, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An energy recovery device, in particular of static and kinetic energy, has at least one hydraulically controlled working cylinder (110) or a hydraulic engine (210) that moves tools back and forth, preferably up and down. The working cylinder (110) or the hydraulic engine (210) can be connected to a hydraulic circuit (132) with a pump (134) and to a hydraulic accumulator (138) by a connection line (136). The connection line (136) contains two hydraulically controlled check valves (140, 142) controlled by a control unit, in particular a distributing valve (144), depending on the displacement of the tools or on the state of motion of the working unit. This energy recovery device does not have the disadvantages due to the use of conventional cartridge valves, and is cheap and reliable to operate.
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