Title: Switch

Abstract: A step control switch for variable speed electric motors and the like is provided in which several spring forces are utilized in various combinations in order to reduce the velocity of the thrust force of the control button in either increasing or decreasing the speed of the device being controlled. By utilizing a spring between the push button and the control body of the switch which is placed under an initial stress, and countering the force of that spring with several combinations of springs in the opposite direction, a smooth transition is achieved among the several positions of the switch.

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Inventors: Karpe, Wolfgang (Wetter, DE, US)
Kluge, Johannes (Wetter, DE, US)
Oemus, Klaus-Dieter (Hemer, DE, US)

Application Number: 025933
Filing Date: 1979-04-02
Publication_date: 1980-11-11
Assignee: Mannesmann Demag AG (DE)
Primary Class(es): 200/430 200/303, 200/321
Other Classes:
US Patent Ref:

1158955	Nov, 1915	Apple et al.	200/77.
2347874	May, 1944	Bluemle	200/77.
2386162	Oct, 1945	Hetherington	200/77.
2814681	Nov, 1957	White	200/159.
3855558	Dec, 1974	Hayward	200/303.
4029916	Jun, 1977	Chu	200/340.
4154996	May, 1979	Arnold	200/159.

Other Refs: 1515570

Aug, 1969	DE.

Primary Examiner: Pollard, Steven M.
Assistant Examiner:
Attorney: Mandeville and Schweitzer