Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1996-07-09
1998-08-11
Lopez, F. Daniel
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376A, F15B 910
Patent
active
057912289
ABSTRACT:
A hydraulic or pneumatic actuator wherein the movement of the power transfer shaft is controlled by a movable vent. The actuator is divided into two cells by a power transfer shaft to which is attached a vent follower. In an equilibrium position, the vent is closed off by the vent follower. Moving the vent location to either side of the vent follower causes fluid or gas to escape from one or the other cell. This creates a pressure difference between the cells causing the vent follower to move until it arrives at an equilibrium position. When the vent follower is caused to move the power transfer shaft also moves accordingly. In the rotary version, the vent follower operates in a wiper-type fashion. Movement of the vent follower causes the power transfer shaft to rotate. In the linear version, the power transfer shaft is attached to a piston head. The piston head is fitted into a cylinder which divides the cylinder into two hydraulic or pneumatic cells. The power transfer shaft extends out of one of the cylinders. The position of the vent can be moved to either side of the piston. When the vent is moved to one side of the piston, a pressure imbalance occurs across the piston forcing it to move in the direction of the vent. When the piston moves, the power transfer shaft moves in or out as the case may be.
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patent: 5467800 (1995-11-01), Sallas
Lopez F. Daniel
Welch Teresa J.
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