公开(公告)号：US3617665A

公开(公告)日：1971-11-02

申请号：US3617665D

申请日：1969-12-04

Applicant: CONTROLS CO OF AMERICA

Inventor： BERSON JOHANNES J ,  PILET JOSEPH

IPC: D06F39/08 ,  H01H3/00 ,  H01H35/26 ,  H01H35/34

CPC classification number: H01H35/2657 ,  D06F39/087 ,  H01H3/001 ,  Y10S200/42

Abstract: The pressure switch comprises a toggle switch in which a flexible switch tongue is moved by a pressure-actuated diaphragm against the force of a return spring, and a contact-carrying flexible switch blade, connected to the blade tongue, through an overcenter spring, is moved by snap-action in one direction as the blade tongue moves through the overcenter position in the opposite direction: To effect a safety function; a contact is movable by the switch tongue to engage a stationary contact after a predetermined movement of the switch tongue past the overcenter position, the switch tongue being movable despite the possibility of welding of the toggle switch contacts. Closure of the safety switch by the switch tongue in this way can be used to energize a pump in the event of failure of a water valve to close or to energize a water valve otherwise prevented from energization by welding of two of the toggle switch contacts.