Switch
AssigneeMannesmann Demag AG
InventorsWolfgang Karpe, Johannes Kluge, Klaus-Dieter Oemus
Life of this patent
Estimating the term…
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.
Claims8
A stepped push button switch, comprising
- (a) a housing body;
- (b) a switch contact carrier displaceable in said body;
- (c) a push button engaging said carrier;
- (d) return spring means for maintaining said carrier in off position;
- the improvement characterized by
- (e) a plurality of axially spaced notches on said carrier;
- (f) spring biased lock-in elements for engaging sequentially said notches on said carrier;
- (g) an initial stress spring disposed between said push button and said carrier;
- (h) a top cover plate for said body;
- (i) a bore in said cover plate for receiving said push button;
- (j) opposed grooves in said body at right angles to the axis of said contact carrier and on eacn side thereof;
- (k) a U-shaped guide disposed in each said groove;
- (l) the legs of each U-shaped guide forming slots for receiving said lock-in elements;
- (m) the springs of said lock-in elements received in said U-shaped guides;
- (n) a thrust bearing disposed between each said lock-in element and its respective spring;
- and
- (o) pegs disposed on each said thrust bearing and the opposed wall of each said groove for receiving each end of the said springs of said lock-in elements.
Dependencies are inferred from the claim text.