Pneumatic cylinder with positioning, braking, and feed rate cont

Details Pneumatic cylinder with positioning, braking, and feed rate cont Pneumatic cylinder with positioning, braking, and feed rate cont

1989-06-27

1991-04-23

Kwon, John T.

Power plants

Pressure fluid source and motor

Pulsator

60591, 60593, 92 9, 92 12, 92 131, 92 136, 92 65, 92 75, F15B 700

Patent

active

050090682

ABSTRACT:
A pneumatic piston/cylinder unit comprises primary and secondary pistons operable in first and second cylinder zones respectively. Each of the primary and secondary pistons divide its respective cylinder zone into two chambers, one of the chambers of the first cylinder zone being connected to one of the chambers of the second cylinder zone via a passageway which includes at least one control for the flow of hydraulic fluid therethrough. A tertiary piston is provided in the one chamber of the first cylinder zone and divides that chamber into two parts, one of which is between the primary and tertiary pistons. In use the passageway, the one chamber of the second cylinder zone and the other part of the one chamber of the first cylinder zone are filled with hydraulic fluid. Application of pneumatic pressure to the other chamber of the first cylinder zone causes the primary piston to be displaced until it abuts the tertiary piston whereupon movement of the primary piston may be arrested or controlled.

REFERENCES:
patent: 2596471 (1952-05-01), Densmore et al.
patent: 2605751 (1952-08-01), Perry et al.
patent: 2860604 (1958-11-01), Morf
patent: 2918902 (1959-12-01), Robinson et al.
patent: 2976845 (1961-03-01), Goldring
patent: 3005444 (1961-10-01), Steibel
patent: 3190077 (1965-06-01), Scholin
patent: 3426530 (1969-02-01), Georgelin
patent: 3866727 (1975-02-01), Myers
"Variable Oil Volume Modulates Air Cylinder Strokes", Hydraulics & Pneumatics, vol. 39, No. 5, May 1986, By G. Crouch, pp. 45-47.

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