GB1188894A - Mercury Switch. - Google Patents

Abstract

1,188,894. Fluid actuation of switches. DRESSER INDUSTRIES Inc. 10 Sept., 1968 [28 Sept., 1967], No. 42950/68. Heading H1N. A condition responsive switch includes a mercury tilt switch bulb 40 having leads 41, 42, means 20 for sensing the condition and operable to actuate the bulb 40, a bulb support 45 mounted for pivotal movement about 47 to tilt bulb 40, connecting means operatively connecting the condition sensing means 20 to the bulb support 45 for tilting bulb 40 and means permitting interchangeability between connecting locations of the connecting means to support 45 to preselect between normally open and normally closed operation. As shown, the condition sensing means comprises Bowdon tube 20 operating through linkage 21, a lever 26 pivoted at 32, the end of lever 26 opposite linkage 21 carrying a clip 59 fastened to a pin passing through a hole on the left-hand side of pivot 47 in support 45. To change from normally open operation (shown) to normally closed operation the pin is transferred to the hole on the right-hand side of pivot 47 in support 45 and clip 59 moved along lever 26 accordingly. Stop 54 limits the movement of the bulb support which includes embracing bracket 48 having arms 52, 53.