GB782174A - Improvements in electric tumbler switches - Google Patents

Abstract

782,174. Tumbler switches. BONNELLA & SON, Ltd., D. H. July 25,1955 [July 23, 1954], No. 21622/54. Class 38 (5). A switch comprises a bridging contact 17 biased by springs 18, 19 towards fixed contacts 13, 14 and moved away therefrom by a saddlelike member 20 connected by a pin 21 and insulating link 22 to a dolly 11. The pin 21 is guided in vertical grooves 24 in the opposed casing parts 5, 6 and biased by a spring 25 to retain the dolly in the " on " position with the top of the saddle 20 spaced slightly from the contact 17. The pivotal connection 23 of the link 22 with the dolly is offset from the axis of the latter such that the force of the spring 25 holding the dolly in the " on " position is the same as the combined forces of the springs 18, 19, 25 holding the dolly in the " off " position. In a double pole switch construction (Fig. 4, not shown) two bridging contacts arranged side-by-side are simultaneously operated by a common insulating saddle member, each contact having its own pair of biasing springs, and an insulating plate is fixed between the casing parts 5, 6 to separate the two poles and the external terminals therefor.