Fluid pressure actuator
AssigneeAutomotive Products plc
InventorsAlastair J. Young, John P. Burke
Life of this patent
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Abstract
This invention relates to fluid pressure servo motors having two operatively independent fluid chambers, each chamber having a piston means therein movable in response to a fluid pressure differential so as to alter in use a two position device from one to the other of said two positions, each piston means having a lost motion means connection to allow the idle return of the piston in the event of cessation of the fluid pressure differential, wherein the two pistons are co-axial and move in opposite directions in response to the pressure differential and one piston is fixed to a stirrup formed as a wire loop which bridges the other piston to act in use against said device.
Claims6
A fluid pressure servo motor comprising:
- a body;
- two co-axial fluid chambers supported by the body and being operatively independent
- a pair of co-axial piston means located one in each chamber and being movable in opposite directions in response to a pressure in their respective chamber, a two condition member movable in opposite directions from one to the other of said two conditions by said pair of piston means, and each piston means having a lost-motion means connection with said member for abutting engagement therewith and to allow idle return of the piston means without movement of said member in the event of cessation of the pressure;
- and a stirrup formed from a loop of wire which is fixed to one piston means and bridges the other piston means to act in use against the two position member, said other piston means and said stirrup defining a lost motion connection therebetween such that said other piston means is able to move independently of the stirrup.
Dependencies are inferred from the claim text.