Patent · US Expired

Electromagnetic solenoid operated switch, particularly starter switch for automotive engines

US4251788A · kind A · utility

9Cited by

3References

9Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Otto Barthruff · Stuttgart, DE
Martin Mayer · Sersheim, DE
Martin Sprenger · Leinfelden, DE

Key dates

Filing date	Jul 16, 1979
Grant date	Feb 17, 1981
Priority date	—
Expiry date	Jul 16, 1999

Classification

Technology area (CPC H)Electricity
CPC primaryH01H51/065
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To reliably hold a movable contact bridge carrier on a longitudinally slidable contact stem in position, even though subjected to severe vibration and shock, while still permitting free longitudinal movement of the stem carrying the contact carrier, the stem is passed through an opening formed in the magnetic yoke of the operating solenoid, and a clamping bushing, for example of tough, elastically deformable plastic, such as nylon, is placed in position to surround the stem where it passes through the opening, the bushing having spreader elements which extend radially outwardly to resiliently bear against the inner surface of the opening, the spreader elements merging into a cylindrical portion of the bushing surrounding the stem to hold the stem in centered, vibration and shock-absorbing position within the opening in which it is longitudinally movable.

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