Rotary electrically actuated device

Claim 1

A rotary electrically actuated device comprising a stator member having a base section, a post projecting from said base section and having a distal end, and a plurality of extensions protruding from said base section and being in spaced substantially symmetrical relation with respect to said post, said extensions having interior curved surfaces spaced from the exterior of said post, said interior surfaces coacting with said base section to form a cavity having an open end adjacent said post distal end; coil means disposed within said cavity and having means for connecting to a source of electricity; rotor means in supporting engagement with said post distal end and rotatable through a predetermined sector, said rotor means including a first section extending into said cavity and having a curved peripheral surface disposed adjacent the extension interior surfaces and conforming substantially to the curvature thereof, circumferentially spaced magnetic pole means carried on said first section and having corresponding endfaces disposed adjacent to, but spaced from the extension interior curved surfaces, each endface having a surface configuration wherein one side portion thereof is narrower than the opposite side portion, said endfaces being in substantial registration with said curved surfaces when the coil means is energized and said rotor means is disposed at one location within said predetermined sector, said rotor means being biased to normally assume a second location within said sector wherein only the narrow surface side portions of said pole means endfaces are disposed adjacent the interior surfaces of said extensions and the remainder of the endfaces are out of registration with said extension interior surfaces, said rotor means including a second section extending from said first section and away from said coil means.