US 5,865,028 A · Energy recovery device

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.

Claims22

Dependent claims

A device for recovery of energy, comprising:

a first hydraulically operable working cylinder for moving a working tool;
a hydraulic circuit coupled to said working cylinder, said circuit including a pump in fluid communication with a hydraulic accumulator through a connecting line;
two hydraulically openable non-return valves arranged in said connecting line;
and
a control unit coupled to said non-return valves and controlling said non-return valves alternatively and independently, said control unit including a first multi-way valve responsive to movement of the working tool.

2 more elements

Dependencies are inferred from the claim text.

Energy recovery device

Life of this patent

Energy recovery device

Life of this patent

Abstract

Claims22