Axially contractable actuator

Details Axially contractable actuator Axially contractable actuator

1985-10-16

1990-07-10

Fox, John

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

92 48, 92 90, 254 93R, F15B 1500

Patent

active

049399829

ABSTRACT:
An axially contractable actuator which includes an elongated hollow enclosure (14) formed by a fluid impermeable substantially non-elastic material and having a plurality of protrusions each with respective bases having more than three sides. Each base side (48) of a protrusion is attached to a base side (48) of an adjacent protrusion by a flexible seam of continuous fold (55). Each protrusion is foldable about a plane dividing the protrusion into two parts from an axially-extended condition in which the base sides are substantially parallel, to an axially-contracted condition in which the protrusion encloses a volume larger than that enclosed in the axially-extended condition. A pair of axially-aligned end terminations (18) are formed at each end of the enclosure with one of the end terminations being hollow. A pair of end connectors are each coupled to a respective end termination with one of the end connectors having an axial bore providing fluid communication between an interior of the hollow enclosure as a source of pressurized fluid.

REFERENCES:
patent: 2019160 (1935-10-01), Scusch
patent: 2438088 (1949-09-01), Haven
patent: 3645173 (1972-02-01), Yarlott

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