Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
AbstractThis switch is a low-mass device with adjustable sensitivity to pneumatic input signals. The switch has a long operating life.
This switch is a low-mass device with adjustable sensitivity to pneumatic input signals. The switch has a long operating life.
Housing unit 1 supports a three-pronged stationary contact element 2 in its central chamber. Spring contact member 3 rests a distance above contact 2 on annular shoulder 4 of housing 1 and is held in place by restraining ring 5. Member 3 has movable central disk 6 connected with the outer portion by spring sections 7 which flex downwardly under pressure to meet contact 2. The shaded areas at the inner ends of spring sections 7 make electrical contact with the shaded areas at the outer ends of the stationary contact prongs. The extent of movement required to make contact is adjustable by raising or lowering the stationary contact prongs with adjusting screws 8. The contact faces are suitably plated. Terminal pins 9 and 10 extend from the elements 2 and 3 through housing 1 for electrical connections.
Spring sections 7 normally hold the switch in open position. It is closed by pressure of piston 11 against disk 6. Piston 11 is sealed in the contact chamber by diaphragm 12 and sealing ring 13. Cover member 14 rests over diaphragm 12 and is secured in place by inwardly-bent locking tabs 15. Piston 11 is forced down to close the switch contacts by creation of a pressure gradient across diaphragm 12. This is accomplished by applying positive pneumatic pressure to port 16 in cover 14 or by applying vacuum pressure to port 17 comm...