Variable resistance device
US4004264A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1975 |
| Grant date | Jan 18, 1977 |
| Priority date | — |
| Expiry date | Mar 17, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S338/01
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable resistance device of the type wherein a worm screw is utilized to move a contact bearing member through a path of travel relative to conductive and resistive tracks. The variable resistor includes a ratchet member having a single elongated spring section attached to a body portion. The body portion has two rigid legs extending therefrom. The spring portion of the ratchet member is disposed within a groove formed in a surface of the contact bearing member. The rigid legs of the ratchet member are the sole elements in contact with the worm screw when the contact member reaches the end of its travel relative to the resistive and conductive tracks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.