Method of mounting flexure arms on a cast rotary actuator
US4870525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | May 5, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rotary actuator having at least two legs or arms extending from the distal end of a body containing a bore through which passes a shaft about which the body rotates. A frame extends from the opposite end of the body to support a flat coil which, when the actuator is assembled, cooperates with magnets to function as a rotary "voice coil". The entire structure (i.e. the legs, body and frame) is formed as a monolithic structure by casting aluminum or some other non-magnetic metal. Other manufacturing techniques may be used, such as investment casting, machining or extrusion. Hence, no assembly is needed to join the legs or the coil-support frame to the body. Flexure elements are secure to the legs and each flexure element has a hollow pin that is placed within an opening of a respective actuator leg. A ball is driven downwardly through each hollow pin to expand that pin laterally and thus wedge the flexure into firm contact with a mounting pad on the leg. The ball is driven through all the pin/pad holes in succession for a one-step mounting operation for the multi-arm actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.