Linear actuator with positive stop
US5136889A · kind A · utility
9Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Sep 6, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18688
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improvement to a linear actuator (9) having a lead screw (15) received in a drive tube assembly (17) is provided in the form of a bushing (41) mounted on the end of the screw. The outer dimension of the bushing generally corresponds to the inner dimension of the tube. The bushing has a recess (53) formed in one face to accommodate a washer (55). A retaining ring (59) holds the bushing in place. The bushing serves both to prevent contact between the lead screw and tube to reduce noise during actuator operation, and as a positive stop to prevent disengagement of the lead screw from the drive tube assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.