Double acting actuator

Details Double acting actuator Double acting actuator

1977-02-24

1978-09-19

Schwadron, Martin P.

Expansible chamber devices

One working member reciprocates and another rotates common...

92 33, 92 71, 92116, 92165PR, 92177, F01B 2102

Patent

active

041145178

ABSTRACT:
The actuator comprises a cylinder of non-circular cross section having three ports and a center axis, three pistons and a piston rod which is provided with at least one male thread having a pre-determined helical angle at a pre-determined pitch. One of the pistons is mounted on the piston rod for rotation relative thereto while being fixed against axial displacement therealong, and the other two pistons are provided with at least one female spiral thread engaged with the male spiral thread on the piston rod, while being maintained at a small spacing therebetween. Thus, the piston rod can reciprocate in the cylinder in opposite axial directions and can rotate, relative to the cylinder, in opposite angular directions, and further, an accurate positioning of the piston rod can be effected at a beginning and/or an end of an operating cycle thereof.

REFERENCES:
patent: 2918799 (1959-12-01), Geyer
patent: 2955579 (1960-10-01), Block
patent: 3090244 (1963-05-01), Davis
patent: 3183792 (1965-05-01), Allen
patent: 3763747 (1973-10-01), Beichel
patent: 3776106 (1973-12-01), Pish
patent: 3823651 (1974-07-01), Ogilvie
patent: 3905278 (1975-09-01), Ourdouillie
patent: 3961559 (1976-06-01), Teramachi

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