437309-A is referenced by 5 patents.
437,309. Snap-action switches. WALSALL CONDUITS, Ltd., and PERKINS, E., Excelsior Works, West Bromwich, Staffordshire. May 9, 1934, No. 13980. [Class 38 (v)] [See also Group XXXVI] A switch associated with a wall socket fixture is operated by a rotatable boss 17, Fig. 2, that is turned by a projecting spindle 52, Fig. 3, attached to a knob 50 on the plug member 46. The earthing-pin 48 moves a spring- pressed catch 55 out of engagement with a notch 58 in the boss 17.; The boss is connected to a two-bladed switch arm 22, Figs. 5, 7, by a roller 39 mounted eccentrically on the boss and co-operating with a forked lever 34 pivoted at 35 and having a lug 36 that engages a recess 37 in a bifurcated lever 26 pivoted on a pin 23 concentrically with the switch arm 22 and connected thereto by a snap action device comprising a rod 28 pivoted to the lever 26 at 30 and passing through a crosspiece 32 on the switch arm, a compression spring 33 being interposed between the crosspiece and a head 29 on the rod 28. An insulating plate 44 lies between the two fixed contacts 40.