SNAP-ACTION PRESSURE-SENSITIVE SWITCH WITH SAFETY FEATURE RESPONSIVE TO CONTACT WELDING

摘要

1,228,400. Fluid-pressure actuated switches. CONTROLS CO. OF AMERICA. 14 Nov., 1969 [13 Dec., 1968], No. 59540/68. Heading H1N. In a fluid-pressure actuated switch operated by a diaphragm 18 to move a spring tongue 13 against the action of a spring 16 whereby the tongue 13 and coil spring 14 move over-centre to operate the contact blade 12, further movement of the tongue 13 on over-pressure moves a second contact arm 15, between fixed contacts 27, 29 and operates as a safety cut-off switch. The arm 15, may have a limited lostmotion before engagement with a return spring assembly 22, 23. A bridge 17 on the diaphragm 18 may operate an additional set of contacts (not shown).