Abstract: As assembly of normally open pressure responsive electric switches (10a-10e) is provided using a single lead frame (8) for forming respective discontinuous annuli (12) to serve as contact surfaces for pressure responsive discs (42) and a center contact (14) for each respective discontinuous annulus. The lead frame is overmolded with electrically insulative plastic and the circuit paths are electrically separated from one another by severing selected interconnecting runners (40). Each switching station has a disc (42) sealed by a flexible layer (47) and an O-ring (48). A separate lead (26) can be provided for adding switches of an opposite logic, i.e., normally closed, and a thermistor (38) can be included, if desired. The normally closed switches can be modular or the switches (100, 200) can have contacts formed from the lead frame (89).

Abstract: A pressure responsive electric switch (10) is shown having an improved flexible diaphragm (28) to extend the useful life of the switch particularly when used with fluid media of a corrosive nature. The flexible diaphragm (28) comprises a base layer (28a) of resin having excellent mechanical properties over a wide range of temperature and a first level of fold endurance capability covered on one or both face surfaces with a protective layer (28b) of resin having excellent corrosion resistance capability and a second level of fold endurance capability at least as great as the first level. In a second embodiment, the flexible diaphragm is composed of biaxially oriented polyphenylene sulfide which can be used without additional protective layers.

Abstract: A pressure-sensitive switch typically used in an automobile engine room comprises: a housing having a passage communicating with a pressurized fluid path; a switch case fixed to the housing; a diaphragm contained in an interior space defined by the housing and the switch case; a snap disk 31 responsive to an applied pressure to change its shape between two aspects by a snapping motion; a receiving member 50 that receives the snap disk, and switch elements closed or opened by the snapping motion of the snap disk. The receiving member 50 is made of polyphenylene sulfide (PPS) resin.

Abstract: A normally closed, fluid pressure responsive electric switch (10) has an electrically conductive body (12) formed with an orifice (12a) leading to a pressure chamber (12c) which is separated from a switch chamber by a flexible member (14). An annular support plate (18) and disc seat (20) are sandwiched in the body by crimping distal free end (12g) of body (12) over the flange (26b) of a connector body (26). A pressure/force converter (22) has a plurality of outwardly extending fingers which are interdigitated with a corresponding number of fingers extending inwardly from an aperture in the disc seat. The converter has one end (18b) engaging the membrane and an opposite end having a circular force applying surface (22g) adapted to engage a snap acting disc (24) disposed on the disc seat within a recess formed in the connector body. The disc is centered by a centering lip (22e) formed on the converter fingers.

Abstract: A pressure switch includes a switch housing which has an accommodation bore extending inward from one end of the switch housing, and a slide bore extending between the accommodation bore and the other end of the switch housing. A piston is slidably disposed within the slide bore and is adapted to receive a pressure. A terminal serving as one electric contact is fixed to the accommodation bore via a holding ring made of an insulating material. A disk spring serving as the other electric contact is disposed between the piston and the terminal. The disk spring deforms due to a pressing force of the piston and comes in contact with the terminal. The pressure switch further comprises an annular elastic ring placed on the outer end of the holding ring. An end portion of the switch housing is deformed inward so as to elastically deform the elastic ring, thereby sealing the opening portion of the accommodation bore.

Abstract: A pressure switch has a housing with an interior bore extending from one end to the other. A rod slidable within the bore and operated by external fluid pressure extends between a piston at one end of the housing and a mechanically operated electrical switch at the other end of the housing. A spring is disposed about the rod between a first stop on the rod and a second stop on the housing. The spring provides resistance against movement of the rod under external pressure. The resistance of the spring to movement is adjusted by a sleeve engaging the spring, with the sleeve threaded into the bore of the housing for movement longitudinally within the housing. A split ring wedged between two other rings resists movement of the rod to longitudinal movement.

Abstract: A cartridge type pressure switch is formed with a cup-shaped contact flanged outwardly at its rim and slidably nested in an annular spacer. A flexible diaphragm has an integrally formed annular bead ring which is stretched over the spacer to secure the diaphragm in place over the cup-shaped contact. A spring nested in the cup-shaped contact has the outer end registered against a deck or spring retainer. A pair of stationary contacts on opposite sides of the spacer have terminal portions extending outwardly through the deck. The spring biases the cup-shaped contact in a direction to seat the flange against the stationary contacts. When the cartridge is inserted in a bore, the bead ring is compressed to seal the cartridge in the bore.

Abstract: A volumetric pump for administering intravenous fluids to a patient comprises a housing having an elongate cavity therein with an open and a closed end. A resilient sheet of material having a centrally-located aperture covers the open end, and a pump shaft is slidably disposed through the aperture to form a sphincter seal therebetween. An inlet conduit leading from a fluid source (an IV bag) passes through the housing into the cavity near the open end thereof, and an outlet conduit leading to a fluid sink (the patient) passes through the housing from the cavity near the closed end thereof. The shaft is driven back and forth in reciprocating motion inwardly and outwardly of the cavity to produce, respectively, a positive pressure forcing fluid out of the outlet conduit to the fluid sink, and a negative pressure forcing fluid from the fluid source through the inlet conduit.

Abstract: The device comprises: a branch (5) from the outlet (M) of the pump to a cavity (7) partially delimited by a membrane (14); a moving element (16, 22, 24) in a casing (9); a spring (36) pushing said element (16, 22, 24) toward the membrane (14) and capable of yielding under the action of a relatively restricted pressure of the water which reaches said cavity (7) and acts on the membrane; and moving electrical contacts (26) on said element (16, 22, 24), interacting with fixed contacts (28) of a supply circuit of the pump, to enable the pump to be switched on and to switch it off in the absence of pressure acting on the membrane (14).

Abstract: A pressure actuated switch has a diaphragm mounted across a piston having a piston head. Movement of the piston under pressure variations acting on the diaphragm actuates the pressure switch. A support disc is provided for the diaphragm, the support disc being mounted between the diaphragm and the piston. The support disc is preferably made of a high tensile elastic material and has an outer annulus that extends beyond the piston head, an inner disc that is smaller in diameter than the piston head; and a flexible intermediate annulus cantilevered between the outer annulus and the inner disc.

Abstract: A miniature pneumatic switch apparatus has a diameter of three-eights inches and a height of five sixteenths inches and operates from minimal pressure to 100 psi. A pressure responsive unit includes outer spaced guide walls extending from a pressure movable wall. A switch unit is secured to the guide walls in spaced aligned relation to the movable wall and forms an operating chamber. A spring carrier is mounted within the chamber. The carrier includes a plate having a lateral opening with a beam spring extending therethrough, with the spring ends supported in openings aligned with the plate. An elastic band encircles the support walls and holds the beam spring in place. The opening in the plate facing the switch unit is a flat face, and the opposite face facing the movable wall is curved for line contact with the spring.

Abstract: A differential pressure switch particularly suitable for monitoring dirt accumulation on a filter element of an oil-separating air filter comprising a piston which is movable in response to a relative change in pressure between two pressure zones and is biased in one direction by a restoring spring, and a rolling membrane which separates the pressure zones.

Abstract: A suction-actuated control system (10) for a whirlpool bath/spa installation includes a suction-side transducer (52) connected in the suction inlet path and a controller (54). The suction-side transducer (52) transmits an air pulse to the controller (54) when pressure in the suction path drops below a pre-determined value caused, for example, by a full or partial blockage of a suction cover (26) by a wash cloth or an article of clothing. The controller (54) includes an electric switch (62) in circuit with the recirculation pump (34) and a bi-state controller (66) that actuates the electric switch (62) between its ON state and its OFF state. An abnormally low pressure in the suction path to the recirculation pump (34) caused by a full or partial blockage of the suction cover (26) will cause the controller (54) to shut-off the recirculation pump (34). After the obstruction is removed and a short time delay, the user can actuate a user ON/OFF control (56) to restart the pump (34).

Abstract: A reversing switch and more particularly a diaphragm operated electrical polarity reversing switch which has general utility but in the application the reversing switch is disclosed for use in combination with a vehicle mounted spray device including a discharge nozzle which may be used for applying chemicals, liquid fertilizers and other liquids such as when applying such materials alongside of roadways to effectively apply liquid throughout the width of the road right-of-way in which spray nozzles are mounted adjustably on a pivotal arm-type support assembly at the right front of a vehicle and a control arrangement is oriented in the cab of the vehicle to enable the vehicle operator to control the spray apparatus.

Abstract: The problem of providing plurality of different models of pressure switches to suit the requirements of a plurality of differing manufacturers may be minimized or eliminated in a pressure switch, including a frame (20), a diaphragm (50) secured to the frame (20) and adapted to be exposed to a mechanical source of fluid under pressure, such as a compressor, and electrical contacts (64), (66), (70) mounted on the frame (20) for relative movement toward and away from each other between open and closed positions. A lever system (72), (80) is mechanically interposed between the diaphragm (50) and the contacts (64), (66), (70) for effecting the previously mentioned relative movement and an unloader valve (110) is mounted on the frame (20) and adapted to be connected to the source of pressure fluid and operable when the contacts (64), (66), (70) are in an open position to vent fluid under pressure from the source.

Abstract: A high pressure switch (10) is shown having a housing member (12) with an orifice (22) extending from a first end (18) to a recess (24) formed in a surface (26) in a central portion (14) of the housing. A sidewall (28) extends from surface (26), leaving a shoulder around the recess, forming a cavity (32). An annular support plate (34) is received on the shoulder of surface (26) capturing a flexible membrane (36) which closes recess (24) to form a pressure chamber. An eyelet (40) is disposed contiguous to the support plate (34) and is locked in place by deforming the outer distal portion (30) of wall (28) radially inwardly over the outer periphery of eyelet (40). A terminal (44) is mounted on eyelet (40) but electrically isolated from the outer ring of eyelet (40) by electrically insulating material (46).

Abstract: A power breaker for a compressor for automobiles including a base provided with a first conducting member and a second conducting member, a circular plate disposed within the base and having a center hole, a resilient disc arranged on the circular plate and including annular portion on which is fitted a diaphragm, a pin inserted through the center hole of the circular plate and having one end bearing against the diaphragm of the resilient disc and another end against the first conducting member, a control disc arranged on the resilient disc, a sealing ring disposed on the control disc, a plug formed with a cavity at one end and a curved recess at another end, a spring mounted in the cavity of the plug, a cover engaged with a top of the base and having a threaded hole, and an adjusting screw threaded engaged with the threaded hole of the cover.

Abstract: A pressure switch particularly adapted for use with high pressure fluid is shown having a frusto-conical support surface in the form of a protuberance (121, 121') formed at the center of a surface of a piston guide member (12, 12'). A stretchable diaphragm cap member (14, 14') generally in the shape of an inverted V is closely fitted on the protuberance (121, 121') of the piston guide member (12, 12') as well as the head (111b) of a piston member (111, 111') received in and projecting out of bore (120, 120'a) formed centrally through protuberance (121, 121'). The outer thickened peripheral berm (143, 14'a) of the cap member (14, 14') is inserted into a recess (102e, 102'e) in the wall defining an enlarged portion of the bore (102) which in turn opens to a cavity (103, 103') of the upper housing (10, 10') in which piston guide member (12, 12') is disposed. The cap member (14, 14') serves to seal the fluid passage side of the switch from the remainder of the switch.

Abstract: A pressure responsive switch is shown having an electrically conductive body 12 formed with a bore 24 which extends from one side through the body into recess 30 formed in the opposite side of the body. A switch assembly 34 is received and locked in the recess by crimping downwardly extending wall 32 of the body over the assembly. The switch assembly has a terminal 35 formed with a stationary contact 36 on an end thereof mounted electrically isolated from an annular disc seat member 40 which in turn receives an electrically conductive disc member 56 and a flexible diaphragm 60. An elongated piston 64 is receivable in a port 18 of a pump and is slidably received in bore 24 of body 12 with an end 70 placed contiguous to the diaphragm 60 and center of the disc member 56.

Abstract: A safety pressure sensor in particular for microswitches comprises a base body (2) to be engaged to a receptable containing a fluid under pressure, a flexible diaphragm (6) disposed in contact with the fluid under pressure and acting on a microswitch (9) connected to the pressure sensor (1 ), a protective cap (5) adapted to accommodate the flexible diaphragm (6) and actuating means (10) adapted to transmit the diaphragm thrust to the microswitch (9) through the protective cap (5).

Abstract: A pressure switch (30) adapted to be placed within a pressurized chamber for generating a logical signal when the pressure within the chamber reduces to a determinable pressure P.sub.1. The pressure switch (30) comprises: a pressure vessel (32) sealed at one end (34) by a snap action diagram (40) and having an inner stop (42) and an outer stop (60, 62) respectively positioned on opposing sides of the diaphragm (40) for limiting diaphragm motion. The outer stop comprises: a first cylindrical portion (78), a first pair of parallel slots (80a, b) formed therein and a through bore (70, 72, 74) extending therethrough. A switch assembly is loosely mounted to the outer stop. The switch assembly (90) comprises an upper housing member (92), a lower housing member (94), first and second electrical contacts (96a, 96b) and a pin (98).

Abstract: A novel hybrid air bag inflator system includes a differential pressure monitoring switch which comprises a sealed module containing a gas under a threshold pressure mounted in a gas bag filler tank. The capsule comprises a movable diaphragm connected to a fixed top plate and the diaphragm is supported on a shaped mandrel mounted on a switch body. The switch body and the mandrel are provided with a central aperture through which moves a movable piston and the movable piston forms a support for switch contacts which are normally open until the pressure in the hybrid air bag gas filler tank falls below a predetermined operable reference pressure at which time the switch contacts reach a closed position indicative of a failed or inoperative hybrid system.

Abstract: A diaphragm for a diaphragm pressure switch used to sense paint pressure in an airless, piston-type paint spray gun includes a disc-shaped, deflectable, chemically-inert primary member and a washer-shaped, secondary, resilient member located behind the primary member. The switch includes a hollow body which connects to the spray gun to form a sensing zone therebetween. The switch body houses a spring-biased, linearly displaceable piston with a head which extends through an opening in the body. The primary member of the diaphragm has a first surface exposed to paint in the sensing zone and a second surface with a central region which contacts the piston head. High pressure in the sensing zone deflects the primary member, and deflection of the primary member displaces the piston. The chemically inert primary member withstands the chemically-corrosive effects of solvents in the paint.

Abstract: A pressure responsive switch is shown having an electrically conductive body 12 formed with a bore 24 which extends from one side through the body into recess 30 formed in the opposite side of the body. A switch assembly 34 is received and locked in the recess by crimping downwardly extending wall 32 of the body over the assembly. The switch assembly has a terminal 35 formed with a stationary contact 36 on an end thereof mounted electrically isolated from an annular disc seat member 40 which in turn receives an electrically conductive disc member 56 and a flexible diaphragm 60. An elongated piston 64 is receivable in a port 18 of a pump and is slidably received in bore 24 of body 12 with an end 70 placed contiguous to the diaphragm 60 and center of the disc member 56.

Abstract: A pressure system has a pressure vessel holding gas under pressure and has a pressure responsive device arranged to be responsive to loss of gas from the vessel to provide a warning signal or the like corresponding to the gas loss. The device has two springs opposing movement of a device diaphragm in response to the gas pressure in the vessel, one spring being arranged to oppose diaphragm movement resulting from change in the gas pressure due to change in gas temperature from a selected temperature in accordance with the gas law, and the other spring being arranged to permit diaphragm movement to change position of a control to provide a signal corresponding to a gas loss when change in the gas pressure in the vessel decreases to a selected level at the selected gas temperature.

Abstract: A pressure switch for controlling a switching element includes a spring-loaded piston operatively connected to the switching element and acted upon by a pressure fluid. A diaphragm separates the piston from the pressure fluid for providing a leaktight closure of the working parts of the pressure switch from the fluid stream, with a support ring surrounding the piston and being arranged axially between the diaphragm and a bushing by which the piston is guided in an axial direction.

Abstract: A first belleville spring, having a given preload, controls a translatable, elongate, contact disc assembly, to cause a shunting disc to remove from, and close into contact with a pair of circuit contacts. The assembly is disposed within a translatable carriage, and a second belleville spring having a greater preload controls translation of the carriage, to cause the shunting disc to close into contact with, and remove from, a second pair of circuit contacts. As a consequence dual set points of switching operation is provided. A fluid medium, admitted into a housing for the assembly and carriage, effects translation of the assembly and carriage.

Abstract: A combination high pressure relief valve/high pressure cut-off device includes a housing for mounting in a pressure control installation. A high pressure switch, biased to a closed position, is mounted in this housing. A force transmitting mechanism is also mounted in the housing. The force transmitting mechanism includes a pressure sensing diaphragm adapted to be exposed to the pressure to be sensed. The force transmitting mechanism is responsive to pressure above a predetermined lower threshold pressure value to open the high pressure switch. The device also provides for rupturing the pressure sensing diaphragm so as to provide extreme high pressure relief in the event pressures build above a predetermined upper threshold high pressure value substantially higher. Additionally, the device may be electrically connected by means of a blow-off connector. The blow-off connector includes a resilient latch adapted to remain locked and retain the connector in position under normal operating conditions.

Abstract: A make-before-break pressure switch has a pair of snap-acting discs separated by a travelling spacer. At a low level switching pressure, the travelling spacer is moved by the pressure sensing diaphragm to snap one disc for moving a contact blade to close a pair of contacts. On increasing pressure, the second disc is snapped at a high level switching pressure to cause a blade spring to go over-center and effect snap actuation of the contact blade to re-open the contacts. Upon decreasing pressure reverse operation occurs; and, the over-center blade snaps the blade to close the contacts which remain closed until a low level opening pressure is reached.

Abstract: A differential pressure control provides a housing having a pair of opposing inlets for accepting lines having different fluid pressures therein. The inlets are sealably connected to a central chamber having a piston by means of diaphragms. The piston is joined to a pivoting lever having a free end that translates as the piston is moved by each of the diaphragms. Upon existence of a pressure inbalance, the free end is moved by the piston, tripping a switch that indicates the pressure imbalance. The lever includes an adjustable spring to vary the gain of the switch and further includes a pair of opposing stops that limit the lever's displacement to substantially match that of the throw of the switch.

Abstract: A pressure switch according to the invention combines a pressure chamber with diaphragm, plunger, spring-loaded switch mechanism and electrical contacts in a single compact assembly. According to one aspect of the invention, the terminal board of the pump motor is incorporated into the control switch housing, eliminating the need for wiring from the switch to the terminal board and enabling the switch to be mounted inside the wiring compartment of the motor. According to another aspect of the invention, a pair of opposing blades are used in the switch mechanism to eliminate side forces and decrease friction, improving accuracy and life of the switch. A simple set screw may be used with one of the switch blades, in cooperation with a stop associated with the other blade, to adjust the spring force and thereby control the pressure control differential.

Abstract: A differential pressure switch assembly for low pressure applications permitting accurate "in field" set pointing of same, comprising a capsulized instrument that includes housing high and low pressure sections defining in assembled relation a pressure cavity across which such sections mount a flexible diaphragm separating high and low pressure chambers, with the low pressure section mounting at a site on the low pressure section a snap switch unit of a size appropriate for such assembly, which unit has a projecting plunger therefor that has an end portion disposed in the low pressure chamber of the unit, with the assembly further comprising a pressure differential sensor disposed for effecting electrical switching of the snap switch unit when the pressure of the assembly high pressure chamber exceeds that of the low pressure chamber by a predetermined differential.

Abstract: A normally closed pressure responsive switch has upper and lower housings attached to one another with an electrically conductive snap acting disc placed therebetween. The lower housing includes a base having a recessed area in which a stationary electrical contact is mounted. The snap acting disc is placed on top of the base with a side having a convex configuration facing the stationary contact. An electrically conductive member is placed over the disc with a plurality of contact tabs engageable with the outer peripheral portion of the disc. The upper housing includes a retainer having a bore in which a pressure converter slides. Ribs formed on the bottom of the pressure converter are adapted to engage the outer peripheral portions of the disc between the contact tabs and are captured in grooves of the retainer to restrict angular movement of the pressure converter.

Abstract: A pressure or temperature responsive switch wherein the high temperature environment at the measuring portion of the switch is thermally isolated from other portions of the switch which are incapable of operation at such high temperatures, thereby providing a relatively low cost switch with the desired capability. There is also provided a pressure or temperature responsive switch as noted above which is assembled by friction fit among the parts and without rivets or the like. Furthermore, the materials used permit waterproof sealing by the use of shrink tubing which bonds to the wire insulation.

Abstract: A pressure-transmitting diaphragm system for infusions, especially for infusions supplied by a pressure-generating pump, with an infusion line leading from the infusion receptacle to the catheter and with a pressure transducer that operates in conjunction with a pressure sensor to activate a signal generator.The object of the present invention is to provide a pressure-transmitting diaphragm system for infusions of the aforesaid type that can be employed with different types of infusion system and will immediately indicate excessive pressure in the infusion line, especially when it is occasioned by an obstructed or displaced catheter.A closed pressure line (9) communicates with both the infusion line (1) and the pressure transducer (8).

Abstract: By providing pressure-responsive switch-actuation means constructed for being substantially unaffected by temperature changes, a pressure sensor is attained which is capable of monitoring pressure levels with precision, regardless of the ambient temperature to which the system is subjected. By employing temperature insensitive material to effectively compensate for temperature changes incurred by the remaining sensor components, the actuation control assembly of the sensor is capable of achieving precision monitoring of desired pressure levels regardless of changes in the ambient temperature to which the monitor assembly is exposed. In one preferred embodiment, the pressure sensor of the present invention incorporates a uniquely constructed, machined bellows which further enhances and provides precision pressure sensing capabilities.

Abstract: A fluid pressure transducer with an electrical switch structure therein including a conductor which is movable relative to fixed contacts as influenced by the force of internal spring forces whereas the relative positioning of a spring's end in the housing is adjustable after the transducer's assembly thereby effectively calibrating the switch's opening and closing characteristics relative to a predetermined fluid test pressure.

Abstract: A pressure switch includes a housing, the inner space of which is divided into a pressurized fluid operating chamber and a switch mechanism chamber by a flexible diaphragm. The operating chamber communicates with a pressurized fluid inlet hole, and the mechanism chamber houses a switch mechanism. The diaphragm is hermetically fixed to the inner surface of the housing by an elastic seal member. The switch mechanism has a spring for urging the diaphragm toward the operating chamber. The switch mechanism is turned on or off as the diaphragm is transformed against the urging force of the spring by the pressure of a fluid introduced through the inlet hole into the operating chamber. The diaphragm is constructed by stacking a metal film and a flexible plastic film in layers so that the films are independent of each other.

Abstract: An integral housing and body case contain a diaphragm having one side exposed to an external signal pressure and another side exposed to a chamber in the integral housing and body case so that the diaphragm is able to flex in response to a pressure differential between the sides thereof. A rod in the integral housing and body case is movable in response to the flexure of the diaphragm and loosely carries a movable contact which can engage at least one fixed contact in the integral housing and body case. A first spring biases the movable contact toward the at least one fixed contact so that when the rod is moved by a signal pressure, the resulting movement of the movable contact causes the movable contact to engage with the fixed contact and be maintained thereagainst by only the force of the first spring.

Abstract: In a preferred embodiment, a fluid-operated switch continuously and selectively adjustable over both a pressure range and a vacuum range. The switch includes a diaphragm enclosed in a housing, a first side of the diaphragm communicating with the fluid. On the second side of the diaphragm, actuator means are provided which actuate an electrical switch when the diaphragm is flexed by changes in the pressure or vacuum of the fluid. A main spring provides adjustable resistance to motion of the actuator means in the direction of diaphragm flexure corresponding to an increase in pressure, while a counterspring provides resistance to motion of the actuator means in the direction of diaphragm flexure corresponding to an increase in vacuum. Adjustment of the set point of the switch is effected through adjusting the degree of compression or relaxation of the springs by adjusting a threaded bonnet on the housing.

Abstract: A pressure sensitive switch has means for producing linear motion in response to pressure, means for springably resisting the linear motion, means for operating a switch after a predetermined linear motion, and a lifter pin having a projection on a first end for slidably engaging a hole in the means for springably resisting the linear motion, the lifter pin being mounted between the means for producing linear motion and the means for springably resisting the linear motion so as to transmit force from the means for producing linear motion to the means for springably resisting the linear motion, the lifter pin decoupling rotational motion between the means for producing linear motion and the means for springably resisting the linear motion. A piston may serve as the means for producing linear motion in response to pressure.

Abstract: A welder's mask with breath-activated eye shield which includes a conventional welder's mask housing with hardware for mounting upon a welder's head. A viewing opening exists in the mask housing which receives a welder's eye shield into an eye shield framework. A power source and motor are mounted to the mask housing. A linkage is attached between the shaft of the motor and the eye shield. The motor operates to turn the shaft in either rotational direction causing the linkage to move the eye shield out of the eye shield framework or into the eye shield framework according to the welder's choice. Operation of the motor is controlled by a breath-activated switch. An air chamber includes an aperture covered by a resilient diaphragm. A tube is connected to a second aperture in the air chamber. The welder exhales to outwardly flex the diaphragm from the chamber and inhales to inwardly flex the diaphragm. A rigid stem is connected between the diaphragm and an electrically conductive element.

Abstract: A switch mechanism for controlling a motor that runs a well pump. Water line pressure acts on a diaphragm to pressurize an air chamber that communicates with a pressure switch. The switch components are isolated from the water line (by the air chamber), to minimize the possiblity of switch failure due to ice formation (winter time operations) or corrosion.

Abstract: A triple action pressure switch apparatus includes a housing having a pressurized fluid introducing path, the inner space of which is partitioned into a pressure actuating chamber communicated with the path and a switch mechanism storage chamber by a diaphragm. In the latter chamber, a third snap disc assembly, a first piston, a second snap disc assembly, a second piston, a first snap disc assembly, and first and second switches are arranged from the diaphragm in this order in a longitudinal direction of the housing. When the pressure of the pressurized fluid reaches a lower limit of a certain range of value, the first disc is transformed to set the first switch in one of ON and OFF states. When the pressure of the pressurized fluid reaches an upper limit of the range, the second disc is transformed to move a first tubular rod slidably inserted in the second piston and the first disc. Such movement of the first rod set the first switch in the other of ON and OFF states.

Abstract: A pressure receiving member which has a diaphragm held in a pressure receiving case is manufactured independently of a main sensor body member, which has a switch accommodated in a switch case. The pressure receiving member and the main sensor body member are then assembled to provide a pressure sensor.According to the present invention, since the pressure receiving portion and the main sensor body are manufactured individually, a diaphragm inversion movement test can be carried out individually of the testing of switch turning on and off, and hence only satisfactory pressure receiving portion and main sensor body which passed the respective tests will be utilized in the operation of assembling pressure sensors.

Abstract: A dual-action pressure switch apparatus has a piston member disposed in a switch mechanism containing chamber sealingly pertitioned by a diaphragm in the inner space of a housing, and being movable in the axial direction of chamber. A high-pressure snap disk is placed on the side surface of piston and contacts the diaphragm. In the chamber, a low-pressure snap disk is so arranged that its outer rim engages with the inner periphery of chamber and sandwich the piston between its center and the diaghragm. When the pressure of a pressurized fluid introduced in the inner space is lower than the lower limit of a certain range of values, both low and high snap disks are stable, so that paired resilient switch pieces disposed adjacent to the low snap disk in the chamber separate from each other. When the pressure is set in the certain range, only the low snap disk is transformed to push one switch piece to make it contact the other.

Abstract: A differential pressure switch assembly that includes a conventional snap action switch for controlling the off-on modes of operation of state of the art equipment, which assembly comprises a high pressure plate that defines the high pressure cavity and a high pressure port of restricted size therefor, a low pressure plate that defines a first subchamber of the assembly low pressure cavity and a low pressure port therefor, a diaphragm clamped between the high and low pressure plates and separating the switch assembly high and low pressure cavities, a piston mounted in the low pressure plate for movement perpendicularly of the assembly diaphragm and biased toward the diaphragm by an adjustable range spring device, the range spring of which can be adjusted to provide the set point for the switch assembly, with the range spring device being formed to dispose the range spring in a second low pressure subchamber that is in open communication with the first low pressure subchamber to form a composite low pressure c

Abstract: A pressure switch for controlling the pressure of a refrigerant has a first switch normally open biased, which first switch is used for a condenser, and a second switch normally closed biased, which second switch is used for a compressor. The three-function pressure switch has a pressure chamber partitioned by a diaphragm. First to third movable elements urged toward the diaphragm are displaced in response to the pressure applied via the diaphragm. Displacement of the first and second movable elements is restricted by a stepped portion of the housing. An actuating projection provided on the third movable element presses upward a second leaf spring of the second switch at a lower limit pressure value so as to open the second switch. When the pressure reaches a normal maximum value, a first snap disc mounted on the first movable element actuates the first switch via a push rod. First snap disc and the push rod are restored at a minimum pressure value.

Abstract: A pressure sensing device associated with a motor vehicle tire is able to signal a lowering of the tire pressure below a minimum value or a raising of this pressure above a maximum value, these minimum and maximum values being adjustable separately.

Abstract: A fluid pressure switch is shown including first and second discs each having convex-concave surface configurations on opposite sides thereof adapted to invert its configuration upon being subjected to selected pressure levels. A slidably disposed plural stage pressure converter having a flexible membrane on one side thereof is operatively coupled to the discs to transfer force from fluid pressure received by the membrane. A motion transfer member extends from the second disc to an electric switch. At a first range of pressures the first disc prevents actuation of the switch, at a second range of pressures the curvature of the first disc has inverted allowing actuation of the switch while at a third range of pressures the curvature of the second disc has inverted resulting in deacuation of the switch.