Variable resistor with a 'clutching' arrangement

Details Variable resistor with a 'clutching' arrangement Variable resistor with a 'clutching' arrangement

H - Electricity

01

C

338/9

H01C 10/14 (2006.01) H01C 10/32 (2006.01)

Patent

CA 1165417

VARIABLE RESISTOR Abstract of the Disclosure A trimmer potentiometer or like variable resistor, which is of the kind having a worm 21 driving an elastomeric worm wheel 10 carrying a wiper contact to slide on an arcuate resistance element, has the gear teeth formed on circumferentially-spaced rim sections 23, 24, 25 projecting cantileverwise from an axially thick unbroken rim 10b of a radial flange on the main body 10c of the wheel, some sections 23 having only a few gear teeth and being separated by sections 24, 25 having larger numbers of gear teeth. The extent of rotation of the wheel 10 is limited to less than 360° and the sections 23 with few teeth are arranged to be in mesh with the worm at the limits of wheel rotation so as to give a de-clutching effect by inward deflection of these sections on over rotation of the worm.

378427

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