Patent · US Expired

Rheostatic devices

US4701740A · kind A · utility

5Cited by

4References

20Claims

0Family size

Assignee

Preh, Elektrofeinmechanische Werke Jakob Preh, Nachf. GmbH & Co. · DE

Inventors

Oswald Reuss · Unterelsbach, DE
Franz Rutterschmidt · Heustreu, DE

Key dates

Filing date	Nov 27, 1985
Grant date	Oct 20, 1987
Priority date	—
Expiry date	Nov 27, 2005

Classification

Technology area (CPC H)Electricity
CPC primaryH01C10/34
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The interior of a rheostatic device, such as a throttle-valve position potiometer having a rotor with sliding spring contact and a housing exposing at least one end of the rotor for operation, is sealed off against environmental effects by at least two hollow cylindrical rotor walls which are located concentrically within each other and extend towards a lid attached to a bottom part of the housing and at least two hollow cylindrical walls of said lid which are concentrically disposed within each other and extend between the rotor walls.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.