Pressure responsive switch

Claim 2

A pressure responsive electrical switch that makes electrical contact in response to a change of fluid pressure comprising a conductive body member, an insulator body member integrally attached to said conductive body member, a diaphragm secured between said conductive body member and said insulator body member by a first and second conductive disc, said first and second conductive discs being the stationary contact, a movable contact, said movable contact being inserted through said stationary contact and said diaphragm with said movable contact secured in a fluid tight relationship to said diaphragm by means of a third conductive disc on the side of said diaphragm opposite said stationary contact and being located in said insulator body member, insulator means between said movable contact and said stationary contact, a fourth conductive disc opposite said third conductive disc in said insulator body member having a terminal thereon, a spring between said third and fourth conductive discs that provides an electrical path from said movable contact to said terminal, said conductive body member having a fluid passage therein whereby fluid forced into the passage will act on said diaphragm to move said diaphragm and therefore said movable contact into engagement with said stationary contact whereby the switch electrically goes from a normally open to a normally closed position, said conductive body member having means of securing said pressure responsive switch to a fluid source.

Claim 3

A pressure responsive electrical switch that makes electrical contact in response to a change of fluid pressure comprising a conductive body member, an insulator body member integrally attached to said conductive body member, a diaphragm secured between said conductive body member and said insulator body member, a first conductive disc secured to said diaphragm and also secured between said conductive body member and said insulator body member, a contact member secured on a ledge and in contacting relationship with said conductive body member and being insulated from said first conductive disc by an insulator means, said conductive disc, spring insulator means, the conductive body and insulator body members providing a means of pressure on the edges of said contact member to change the shape of said contact from an initial generally curved position to a generally planar position, a second conductive disc on the opposite side of said diaphragm from said first conductive disc having a terminal thereon, a spring between said first and second discs that provides an electrical path between said conductive discs to said terminal, said conductive body member having means of securing said pressure responsive switch to a fluid source, a fluid passage in said conductive body member whereby fluid into the passage having enough pressure to overcome the spring pressure will impinge on said diaphragm to move said diaphragm against said spring thereby removing pressure from the edges of said contact member whereby said contact member returns to its initially curved position to make contact with said conductive disc to close the circuit and provide the desired signal.

Claim 4

A pressure responsive electrical switch that makes electrical contact in response to a change of fluid pressure comprising a conductive body member, an insulator body member integrally attached to said conductive body member, a diaphragm secured between said conductive body member and said insulator body member, a first conductive disc secured to said diaphragm and also secured between said conductive body member and said insulator body member, a contact member secured on a ledge and in contacting relationship with said conductive body member and being insulated from said first conductive disc by an insulator means, said conductive disc, spring insulator means, the conductive body and insulator body members providing a means of pressure on the edges of said contact member to change the shape of said contact from an initial generally curved position to a generally planar position, a second conductive disc on the opposite side of said diaphragm from said first conductive disc having a terminal thereon, a spring between said first and second discs that provides an electrical path between said conductive discs to said terminal, said conductive body member having means of securing said pressure responsive switch to a fluid source, a fluid passage in said conductive body member whereby fluid into the passage having enough pressure to overcome the spring pressure will impinge on said diaphragm to move said diaphragm against said spring thereby removing pressure from the edges of said contact member whereby said contact member returns to its initially curved position to make contact with said conductive disc to close the circuit and provide the desired signal.

Claim 5

In a switch as set forth in claim 2 wherein the contact has a struck-out center finger portion that moves in relationship to fluid pressure on said diaphragm whereby upon pressure that exceeds spring pressure being applied to said diaphragm said pressure on the outside edges of said contact relaxes whereupon said center finger portion moves out of the plane of said contact to engage said conductive disc.