GB450043A - Improvements in rotary electric switches - Google Patents

Abstract

450,043. Actuation of switches. MARR, J., 53, Victoria Street, Westminster. May 21, 1935, No. 14802. [Class 38 (v)] A multiple switch suitable for controlling the ignition and starter circuits of a motor vehicle comprises a barrel 1 carrying cams 3 which can be rotated by a knob 9 into several positions selectively to move contact springs 4 into engagement with fixed contact springs 5. The switch is held in its operative position by a spring catch 12 engaging notches in a metal disc 10 rotatable with the barrel 1. If the knob 9 is pulled to the right against a spring 13 the disc 10 engages springs 15 to close the starter circuit without affecting the operation of the contacts 4, 5. If the knob 9 is pushed to the left the barrel slides so that the cams 3 are out of alignment with the springs 4 and the switch cannot be operated by rotation. In this neutral position, cam discs 7 close certain of the contacts 4, 5 in all rotational positions of the barrel 1. Key operated locking means (not shown), may be provided for preventing movement from the neutral position. Also a pawl may be provided engaging disc 10 to prevent movement back into any position without going into the neutral position first. Also a catch may engage disc 10 to prevent the starter switch being operated except in certain rotational positions. In a modification the cams may be replaced by projections on a metal barrel 1 which engages single contact springs in certain positions and constitutes a common return for all the springs.