Patent · US Expired

Key element for the control of electromotors, especially for cranes and other hoisting equipment

US5631530A · kind A · utility

5Cited by

4References

8Claims

0Family size

Assignee

Mannesmann AG · DE

Inventors

Kurt Hoppe · Bad Sachsa, DE
Markus H. Schmalstieg · Hagen, DE
Bernhard Stanski · Recklinghausen, DE
Anton Munzebrock · Dortmund, DE

Key dates

Filing date	Apr 11, 1995
Grant date	May 20, 1997
Priority date	—
Expiry date	Apr 11, 2015

Classification

Technology area (CPC H)Electricity
CPC primaryH02K11/33
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A key element for the control of electromotors, especially for cranes and other hoisting equipment. The key element includes a key switch pestle, a permanent magnet attached to the key switch pestle and a Hall sensor. The key switch pestle and permanent magnet are moveable both towards and away from the Hall sensor. As the permanent magnet approaches the Hall sensor, a flux density is sensed which triggers the generation of a control signal. In order to create a key element which can be installed in the smallest possible space, in controls and the like, the electronic circuit which includes a permanent magnet positionable toward the Hall sensor is integrated into the key element housing.

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