Rotary shaft position switch

Details Rotary shaft position switch Rotary shaft position switch

H - Electricity

01

H

340/135.6

H01H 35/06 (2006.01) H01H 36/00 (2006.01)

Patent

CA 1129976

Abstract A rotary shaft position indicator and control in which a switch is housed within an enclosure sealed against dust, moisture, corrosive or explo- sive foreign materials and is magnetically actuated in response to rotary shaft position. In one embodiment a plurality of microswitches are disposed within a sealed switch cavity and cams are mounted on a rotatable spindle, each cam positioned to actuate a microswitch. A first annular magnet is secured to the spindle. Disposed proximate the first annular magnet and separated therefrom by a non-magnetic wall is a second annular magnet secured to the rotary shaft The annular magnets are magnetically coupled through the nonmagnetic wall such that rotation of the shaft causes the spindle to rotate, thereby actuating selected microswitches. In an alternative embodi- ment the microswitches are actuated magnetically by bar magnets secured to the rotary shaft and separated from the microswitches by a non-magnetic wall of the sealed housing.

318094

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