Hydraulic positioning cylinder

Details Hydraulic positioning cylinder Hydraulic positioning cylinder

1973-05-23

1976-12-14

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Fluid operated

91460, 92108, F15B 1316, F15B 1702, F01B 3100

Patent

active

039968391

ABSTRACT:
The positioning of the piston rod of a double acting hydraulic cylinder is accurately controlled by means of applying hydraulic pressure, created by the controlled displacement of a fluid independent from the primary fluid system, against the piston of a servo-cylinder which controls the servo-valve for the double acting cylinder. As the piston rod of the double acting cylinder moves, the pressure on the servo-cylinder is relieved and the servo-cylinder is returned to a balanced condition, restoring the neutral position of the servo-valve. In another embodiment the application of pressure to a fluid system independent from the primary fluid system is sensed by an electro-hydraulic transducer and a proportional electric signal is produced for controlling the electro-hydraulic servo-valve of the double acting cylinder. As the piston rod of the double acting cylinder moves, fluid is displaced, relieving the sensed pressure and returning the servo-valve to a neutral position at a new setting of the piston rod.

REFERENCES:
patent: 3063425 (1962-11-01), Vier et al.
patent: 3164065 (1965-01-01), Frantz
patent: 3511133 (1970-05-01), Day
patent: 3710689 (1973-01-01), Henderson
patent: 3772962 (1973-11-01), Suzuki
patent: 3831491 (1974-08-01), Thomas
patent: 3838629 (1974-10-01), Meyers

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