Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1986-08-22
1988-08-23
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91429, 91435, 91459, 92 9, 2511291, F15B 1316, F15B 1522
Patent
active
047652250
ABSTRACT:
A digitally controlled air-over-hydraulic actuator includes a pneumatic cylinder and a hydraulic cylinder each having a separate piston and a common connecting rod. The pneumatic piston applies force to the connecting rod urging movement of the hydraulic piston. Bleeding of oil from one side of the hydraulic piston to the other is controlled by means of digital pulses applied to a digital valve that allows oil on either side of the hydraulic piston to flow to the other. The digital valve includes a moving piston having an oil passage that is momentarily aligned with ports to opposite sides of the hydraulic cylinder. A control system senses the differential pressure between opposite sides of the pneumatic piston to produce pulses that accelerate the digital valve piston past the ports, precisely controlling forced movement of the hydraulic piston.
REFERENCES:
patent: 2101076 (1937-07-01), Laboureur et al.
patent: 2775015 (1956-12-01), Erb
patent: 2821172 (1958-01-01), Randall
patent: 2891514 (1959-06-01), Moeller
patent: 3176801 (1965-04-01), Huff
patent: 3463036 (1969-08-01), O'Connor
patent: 3476266 (1969-11-01), Devol
patent: 3698826 (1972-10-01), Henderson
patent: 3850078 (1974-11-01), Polizzi
patent: 3894477 (1975-07-01), Tomikawa
patent: 3929057 (1975-12-01), Kondo
patent: 4528894 (1985-07-01), Crosby
"Air-Over-Oil Applications", Chapter 12, pp. 223-232.
Garrett Robert E.
Williamson Mark A.
LandOfFree
Digitally controlled air-over-hydraulic actuator and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digitally controlled air-over-hydraulic actuator and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digitally controlled air-over-hydraulic actuator and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-829913