Power antenna with compact direct drive system
US5142295A · kind A · utility
2Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1991 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Jul 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/10
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A compact direct drive system for an extensible and retractable antenna assembly uses a one-piece antenna and no threads or gears. The one-piece antenna is supported so as to slide axially up and down, but is restrained against turning. It runs through the hollow drive shaft of a coaxially supported electric motor. Traction rollers supported on skewed shafts fixed to the end of the drive shaft drive the antenna up and down.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.