Fluid pressure operated diaphragm switch with improved means and method for calibration

Claim 2

A condition responsive device comprising a generally circular cover member, the cover member having an aperture therein for ingress and egress of fluid pressure and formed with a medial annular flange; a snap-acting diaphragm movable to and from first and second positions and having a generally circular periphery attached about and adjacent its periphery to the radial annular flange of the cover member; and an annular calibration-stop member deformable by fluid pressure within a calibration range but nondeformable within a lower operating range, the calibration-stop member having a generally circular inner and outer periphery attached about and adjacent its outer periphery to the diaphragm adjacent and about its periphery, that portion adjacent the inner periphery shaped in a generally concave configuration with respect to the diaphragm and contacting the diaphragm throughout 360*when the diaphragm is in one of its two positions.

Claim 3

A condition responsive device comprising a generally circular cover motion the cover member having an aperture therein for ingress and egress of fluid pressure and formed with a radial annular flange; a snap-acting diaphragm having a generally circular periphery attached about and adjacent its periphery to the radial annular flange of the cover member; an annular calibration-stop member having a generally circular inner and outer periphery attached about and adjacent its outer periphery To the diaphragm adjacent and about its periphery, that portion adjacent the inner periphery shaped in a generally concave configuration with respect to the diaphragm; an electric switch including a cup-shaped base having an upstanding wall; a stationary contact and a movable contact arm, the movable contact arm adapt to engage and disengage the stationary contact; a platelike member of electrical insulation enclosing the base, the platelike member having an aperture therein; and a motion transfer pin slidably mounted in the aperture and adapted to transfer MOTION from the diaphragm to the movable contact arm.

Claim 4

A condition responsive device comprising a generally circular cover motion the cover member having an aperture therein for ingress and egress of fluid pressure and formed with a radial annular flange; a snap-acting diaphragm having a generally circular periphery attached about and adjacent its periphery to the radial annular flange of the cover member; an annular calibration-stop member having a generally circular inner and outer periphery attached about and adjacent its outer periphery To the diaphragm adjacent and about its periphery, that portion adjacent the inner periphery shaped in a generally concave configuration with respect to the diaphragm; an electric switch including a cup-shaped base having an upstanding wall; a stationary contact and a movable contact arm, the movable contact arm adapt to engage and disengage the stationary contact; a platelike member of electrical insulation enclosing the base, the platelike member having an aperture therein; and a motion transfer pin slidably mounted in the aperture and adapted to transfer MOTION from the diaphragm to the movable contact arm.

Claim 5

A device according to claim 2 in which the platelike member is recessed on the side thereof remote from the base to provide clearance for the calibration-stop member.

Claim 6

A device according to claim 2 including a tubular member having two ends, one end formed with a radial flange connected to the outer peripheral portion of the calibration-stop member; the distal end portion of the upstanding base wall formed with a radial flange extending outwardly, the flange of the base wall receiving the other end of the tubular member which is crimped around the flange to lock the electric switch to the device.

Claim 7

A condition responsive device comprising a first member having a recessed portion, a snap-acting diaphragm having a nondevelopable surface responsible for its snapping to and from a first and second position sealingly covering the recessed portion, a calibration-stop member deformable by fluid pressure within a calibration range but nondeformable within a lower operating range, the calibration-stop member located adjacent the diaphragm and configured to contact the nondevelopable surface of the diaphragm adjacent its outer periphery throughout 360*thereof, and means for admitting fluid pressure to the recessed portion whereby fluid pressure will be transmitted through the diaphragm member to the calibration-stop member.

Claim 8

A condition responsive device comprising a first member having a recessed portion, a snap-acting diaphragm having a nondevelopable surface responsible for its snapping to and from a first and second position sealingly covering the recessed portion, a calibration-stop member deformable by fluid pressure within a calibration range but nondeformable within a lower operating range, the calibration-stop member located adjacent the diaphragm and configured to contact the nondevelopable surface of the diaphragm adjacent its outer periphery throughout 360*thereof, and means for admitting fluid pressure to the recessed portion whereby fluid pressure will be transmitted through the diaphragm member to the calibration-stop member.

Claim 9

A condition responsive device comprising a cover member, the cover member having an aperture therein for ingress and egress of fluid pressure and formed with a flange, a snap-acting diaphragm movable to and from generally convex and concave positions, and having a periphery attached about and adjacent its periphery to the cover flange; and a stop member deformable by fluid pressure within a calibration range but nondeformable within a lower operating range, the calibration-stop member having an inner and outer periphery attached about and adjacent its outer periphery to the diaphragm adjacent and about its periphery, the surface of the stop member adjacent the inner periphery thereof shaped in a generally concave configuration with respect to the diaphragm and contacting the diaphragm when the diaphragm is in one of its two positions.

Claim 10

A condition responsive device comprising a cover member, the cover member having an aperture therein for ingress and egress of fluid pressure and formed with a flange, a snap-acting diaphragm movable to and from generally convex and concave positions, and having a periphery attached about and adjacent its periphery to the cover flange; and a stop member deformable by fluid pressure within a calibration range but nondeformable within a lower operating range, the calibration-stop member having an inner and outer periphery attached about and adjacent its outer periphery to the diaphragm adjacent and about its periphery, the surface of the stop member adjacent the inner periphery thereof shaped in a generally concave configuration with respect to the diaphragm and contacting the diaphragm when the diaphragm is in one of its two positions.