Motors: expansible chamber type – With motive fluid valve – Responsive to motor position or orientation
Patent
1985-05-03
1987-02-24
Husar, Stephen F.
Motors: expansible chamber type
With motive fluid valve
Responsive to motor position or orientation
60420, F15B 1116
Patent
active
046448489
ABSTRACT:
An electro-pneumatic pressure regulator control system for precisely adjusting the pressure of fluids applied to a fluid-powered tool such as hydraulic cylinders, pneumatic wrenches and the like includes a current-to-pressure (I/P) transducer, and a fluid conduit coupled in fluid communication between the I/P transducer and the tool including a pressure-to-current (P/I) transducer. In addition, the control system includes an interface which converts an information signal generated in a microprocessor to a current signal of a discrete amplitude for driving the I/P transducer. The interface preferably includes digital, solid state circuitry providing accurate control of the signal being delivered to the I/P transducer. In a preferred form of the present invention, a plurality of sub-control electro-pneumatic regulator systems are selectively activated by a single computerized control. In such a system, the interface of each sub-control system is adapted to receive a disabling command signal while latching the last applied control signal at a particular level. Moreover, in such a system, the P/I transducer can be used to provide a control signal for operating a relay switch used to provide power to a solenoid valve to automatically apply the output pressure to a tool only when a desired output pressure has been generated for introduction into the tool.
REFERENCES:
patent: 3738609 (1973-06-01), Divigard
patent: 4037519 (1977-07-01), Miller et al.
patent: 4244396 (1981-01-01), Friedland et al.
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