Actuator assembly

An actuator assembly (1) comprising a support structure (2); a movable part (10) movable relative to the support structure; a bearing arrangement (20) supporting the movable part on the support structure and arranged to guide helical movement of the movable part with respect to the support structure...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Stephen Matthew Bunting, James Howarth, Robin Eddington, Oliver Hart, David Ooi
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM BLASTING CINEMATOGRAPHY ELECTROGRAPHY HEATING HOLOGRAPHY LIGHTING MACHINES OR ENGINES FOR LIQUIDS MECHANICAL ENGINEERING MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOTOTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISEPROVIDED FOR OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR PHOTOGRAPHY PHYSICS PRODUCING MECHANICAL POWER SPRING, WEIGHT, INERTIA OR LIKE MOTORS WEAPONS WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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Beschreibung
Zusammenfassung:	An actuator assembly (1) comprising a support structure (2); a movable part (10) movable relative to the support structure; a bearing arrangement (20) supporting the movable part on the support structure and arranged to guide helical movement of the movable part with respect to the support structure about a helical axis (H), wherein the bearing arrangement includes at least one flexure (22) which is arranged to flex to cause said guiding; and at least one actuator component connected between the support structure and the movable part and arranged, on contraction, to drive rotation of the movable part around the helical axis, said rotation being converted into helical movement around the helical axis by the bearing arrangement, wherein the actuator assembly includes a resilient portion (41a, 41b), the resilient portion being configured not to deform during normal operation of the assembly, and which is such that, when the assembly is subject to external loads exceeding those of normal operation, the resilient portion is arranged to deform and to thereby permit movement of the movable part relative to the support structure in a plane orthogonal to the helical axis.