Linear actuator
US4827789A · kind A · utility
10Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | May 5, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19902
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A linear actuator includes a single drive gear that engages two driven gears of the same pitch diameter, which in turn drive a spindle and a sleeve, respectively. The sleeve is internally threaded to receive the spindle, which is externally threaded. The sleeve and spindle are driven rotationally at slightly different rates due to different numbers of teeth on the two driven gears, producing linear motion of the spindle relative to the sleeve. The drive gear can be rotated in increments corresponding to integral numbers of teeth and the rest positions of the gears can be full engagement positions to minimize play in the gears.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.