Motors: expansible chamber type – Independently operated timer – delay – pattern or cyclic control – Of independently movable working members
Patent
1976-06-14
1978-01-03
Freeh, William L.
Motors: expansible chamber type
Independently operated timer, delay, pattern or cyclic control
Of independently movable working members
91492, F15B 2102, F01B 106
Patent
active
040660028
ABSTRACT:
A rotary stepper actuator having a rotatable output shaft provided with a cam portion fixedly secured thereto and engaged by a plurality of pairs of oppositely acting fluid pressure responsive pistons wherein each pair of pistons is movable along an axis intersecting the axis of the shaft. Preferably, the pistons are arranged in circumferentially spaced apart formation around the shaft and provided with roller elements adapted to bear against the cam portion the periphery of which takes the general form of an ellipse having opposite depressed mid portions. The applied piston forces acting through the rollers against the peripheral edge of the crank portion produce a force couple tending to rotate the shaft to the extent that the rollers become engaged with the opposite depressed mid portions whereupon the couple becomes reversed preventing further rotation of the shaft. By sequential pressurization of the plurality of pairs of pistons, the cam portion and thus the shaft connected thereto is made to rotate in one or more discrete steps or stepping motion. If desired, the plurality of pairs of pistons may be arranged in so-called "pancake" formation in which case the shaft is provided with a plurality of axially spaced apart cam portions corresponding to the plurality of pairs of pistons.
REFERENCES:
patent: 2095255 (1937-10-01), Holmes
patent: 2712301 (1955-07-01), Gravely
patent: 3075504 (1963-01-01), Vogel
patent: 3583286 (1971-06-01), Chiappulini
patent: 3599536 (1971-08-01), Meyers
patent: 3661059 (1972-05-01), Hunter
patent: 3721158 (1973-03-01), D'Addca et al.
Antonis William N.
Decker Ken C.
Freeh William L.
Kulik Joseph P.
The Bendix Corporation
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