Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1995-02-10
1998-07-14
Look, Edward K.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60372, F15B 1102
Patent
active
057786690
ABSTRACT:
A fluid system is connected to a three chamber fluid cylinder. The effective pressure responsive areas of two of the pressure chambers are equal such that when fluid at a selected rate of flow and at a predetermined pressure is communicated to one of the chambers, a force of a predetermined magnitude is generated to cause contraction of the fluid cylinder at a predetermined rate. A servo valve is disposed in the system between the inlet and outlet of a fluid pump to selectively direct fluid to either of the equal pressure chambers to selective expand or contract the fluid cylinder. The fluid system further comprises an accumulator and a directional control valve adapted to communicate a third chamber of the fluid cylinder to the accumulator. The accumulator maintains the pressure in the third fluid chamber to exert a force on the fluid cylinder balancing a selected load that the cylinder may be carrying during the expansion and contraction stages of the cylinder.
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