Micro-switch Patents (Class 200/82C)
  • Patent number: 5725364
    Abstract: Paint spraying equipment having an electric motor, gear reducer and fluid section for pressurizing paint and a pressure control module utilizing a combined fluid manifold and pressure control component mounting frame formed of a single die casting and including an access port for servicing a pressure transducer and further including a paint relief aperture in the cover for directing leakage of paint to the exterior of the assembly.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: March 10, 1998
    Assignee: Wagner Spray Tech Corporation
    Inventor: Frank G. Mirazita
  • Patent number: 5292232
    Abstract: A self-contained liquid manifold attachable to a drive mechanism for a reciprocable pump, the manifold having a pumping cylinder, pressure transducer, pressure control mechanism, drain valve and control mechanism attached thereto, and liquid delivery outlets all forming a part thereof. The manifold and its associated components are removable from the reciprocable drive mechanism by detaching two fasteners. The pressure transducer and control mechanism includes a piston and cylinder removably indexed in a manifold bore, and an electrical switch in an adjacent housing with a ball bearing on the piston and a push rod resting on the ball bearing, the other push rod end constrained by a ball and spring combination.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: March 8, 1994
    Assignee: Graco Inc.
    Inventors: Duane D. Krohn, Dean L. Schaffran
  • Patent number: 5243158
    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.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: September 7, 1993
    Assignee: Herion Werke KG
    Inventor: Klaus Zimmermann
  • Patent number: 5140113
    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.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: August 18, 1992
    Assignee: United Electric Controls Company
    Inventor: John S. Machado
  • Patent number: 5136128
    Abstract: A hydraulically-piloted switch assembly includes a housing through which runs a hollow conduit that in use contains a fluid under pressure. A linear conduit portion defines a bore one end of which projects away laterally from a portion of the conduit. Slidable sealingly within the bore is a piston. There is an opening in the housing to the exterior atmosphere from the bore with one end of the pistion being movable through the opening to a position exposed beyond the housing. The piston is urged by a compression spring away from the opening to retract the piston end. An elongated leaf spring is secured at one end fo the housing, has an intermediate bend disposed adjacent to the exit of the opening and has its other end defining a finger that projects away from the opening. An outwardly-biased plunger of a microswitch is located in the path of flexure of the finger as the piston end is engaged and disengaged from the bend.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: August 4, 1992
    Assignee: Teledyne Industries, Inc.
    Inventor: Gary Thomas
  • Patent number: 5108265
    Abstract: The temperature-dependent pressure detection switch according to the present invention comprises a pressure receiving member to receive hydraulic pressure, on which spring force of the predetermined value is permanently applied to the direction reverse to the operating direction of said hydraulic pressure and the spring force is varied according to temperature change, and a switch unit, which is operated by the movement of said pressure receiving member against said spring force when predetermined hydraulic pressure is received. Accordingly, when ambient temperature changes, spring force is changed, and the switchover setting pressure related to the on-off switchover operation of the switch unit can be changed according to temperature change. Namely, the pressure detection switch can be provided with temperature-dependent property.
    Type: Grant
    Filed: August 3, 1990
    Date of Patent: April 28, 1992
    Assignee: Jidosha Kiki Co., Ltd.
    Inventor: Ichiro Koike
  • Patent number: 5089673
    Abstract: An electrical switching device includes a switch plunger which is axially displaceable within a housing and two opposing radially directed rocking levers each disposed on a sharp edge formed on the housing. When pressure is applied to the switch plunger, the rocking levers are caused to rotate about the sharp edges and thus each actuate an associated microswitch. The transformation ratio between the stroke of the switch plunger and the stroke of the switch pen of each microswitch can be adjusted by movement of the microswitch with respect to the associated rocking lever.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: February 18, 1992
    Assignee: Imo Industries, GmbH
    Inventor: Hubert Strzodka
  • Patent number: 5061832
    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.
    Type: Grant
    Filed: January 28, 1991
    Date of Patent: October 29, 1991
    Assignee: Dwyer Instruments, Inc.
    Inventor: Stephen L. Squires
  • Patent number: 5034583
    Abstract: An electric switching device for making or breaking the electric continuity between electric connecting elements under the action of an external force includes, in a single case, at least one electric switch having a control member therefor, a movable operating member specific to each switch mounted in the casing for sliding movement along the switch, a tapping in each operating member having its axis parallel to the sliding direction of the operating member, and a rod threadedly cooperating with each tapping, each threaded rod having a first end on which the external force is directly exerted and a second end which can be rotated by an appropriate tool passing through a wall of the case, and the operating member comprises a substantially cylindrical sleeve acting against a coaxially mounted resilient return member, the sleeve having a member directly cooperating with the control member of the switch.
    Type: Grant
    Filed: November 9, 1989
    Date of Patent: July 23, 1991
    Assignee: Sextant Avionique
    Inventors: Bernard Benz, Alain Pigat
  • Patent number: 4952759
    Abstract: The invention relates to a control device for a circuit breaker. The circuit breaker is controlled mechanically by an engagement spring (8), by a disengagement spring (2), and by a hydraulic transmission for transmitting a portion of the energy in the engagement spring to the disengagement spring. The device has circular symmetry about a longitudinal axis.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: August 28, 1990
    Assignee: Societe Anonyme dite: Alsthom
    Inventor: Michel Perret
  • Patent number: 4947154
    Abstract: An alarm device for dripping injection comprising a floating barrel which vertically moves up or down according to fluid volume in the dripping liquid barrel, a touch switch and sealing means which are provided in the upper area of the lower part of dripping liquid barrel, a socket which is provided in the dripping liquid barrel lower part for connection to touch switch, and a power lead and plug provided by a separate action box or a patient room's call assembly to plug the socket. As the contained fluid is used near empty and the fluid volume in the dripping liquid barrel diminishes meantime, the floating barrel, when loosing support by the fluid volume, moves down and touches the touch switch with its own weight, thereby conducting open the separate action box or the patient room's call assembly to alarm nurses or hospital orderly to come to handle.
    Type: Grant
    Filed: August 15, 1989
    Date of Patent: August 7, 1990
    Inventor: Feng-Lin Hwang
  • Patent number: 4827093
    Abstract: A pressure switch has a plunger, axially displaceable by the pressure being measured, which enables a contact pin of a microswitch to be actuated. Between the plunger and the contact pin there is arranged a rocker. The microswitch is fastened to the housing of the pressure switch so as to be displaceable in the main extension direction of the rocker. This provides a way to vary the step-up ratio between the plunger motion and the contact-pin motion, whereby the magnitude of the hysteresis of the pressure switch can be varied.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: May 2, 1989
    Assignee: Delaval Turbine GmbH
    Inventor: Hubert F. Strzodka
  • Patent number: 4827095
    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
    Type: Grant
    Filed: April 12, 1988
    Date of Patent: May 2, 1989
    Assignee: Dwyer Instruments, Inc.
    Inventors: Stephen S. Clark, John M. Donnelly
  • Patent number: 4803318
    Abstract: A proximity switch for signaling the location of a movable member at either of opposite end limits of movement relative to a stationary frame includes a movable member, such as a piston, traveling along a fixed path of movement between a first position and a second position and having an aperture formed within the movable member extending from one end toward another end. A housing encloses a portion of the movable member to form a first fluid chamber between the movable member and a first end of the housing, and to form a second fluid chamber between a second end of the housing and the movable member. Expansion of the first fluid chamber drives the movable member to the first position and expoansion of the second fluid chamber drives the movable member to the second position.
    Type: Grant
    Filed: January 7, 1988
    Date of Patent: February 7, 1989
    Inventor: Robert K. Lymburner
  • Patent number: 4762969
    Abstract: A pressure operated switch has a bistable or multi-stable latching mechanism disposed between a bellows unit and an electrical switch. The latching mechanism has two relatively axially moveable elements which extend and contract with subsequent operations of the bellows unit to provide the bistable action.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: August 9, 1988
    Assignee: Bestquint Limited
    Inventor: Peter M. Tracey
  • Patent number: 4755638
    Abstract: There is provided a hydraulic pressure operated electrical switch having a spring biased piston which is movable by the force of the hydraulic pressure of the fluid to be sensed to activate a microswitch. The pressure required to move the piston can be altered by adjusting the force produced by the spring acting on the piston. An operating pressure differential is provided by a diaphragm which operates to move the piston by reason of the hydraulic pressure exerted thereon. The diaphragm has a spring rate and produces a force in conjunction with the spring bias against the piston when the piston is moved as a result of the hydraulic pressure overcoming the spring bias. The spring rate of the diaphragm is affected by the amount of hydraulic pressure exerted thereon so that, as a result of adjusting the operating pressure of the switch, the operating differential pressure is altered.
    Type: Grant
    Filed: May 21, 1987
    Date of Patent: July 5, 1988
    Inventor: John D. Geberth, Jr.
  • Patent number: 4755637
    Abstract: A proximity switch adapted to be threaded into a pressure cylinder, with the proximity switch including a sensor part insertable into a bore or opening of a cylinder wall of the pressure cylinder for detecting a position of the piston. A housing of the proximity switch includes a metal casing for accommodating a sensor part of the proximity switch, a front cap for sealing the metal casing, an a housing section attached to the metal casing and including a cable connection portion. A continuously extending output collar is provided at a rear end of the metal casing, with the collar being adapted to be fixedly clamped against the cylinder wall by a mounting gland extending behind a rear face thereof or by a coupling ring.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: July 5, 1988
    Assignee: Werner Turck GmbH & Co. KG
    Inventor: Werner Turck
  • Patent number: 4751400
    Abstract: An electrohydraulic switching device for emitting electric control signals in dependence on supplied pressure signals. The switching device has a housing wherein a piston pressurizable by the inlet pressure is arranged so as to be axially displaceable. The piston is spring-loaded against the inlet pressure by means of a compression spring arranged between a spring plate and a guide means. The spring plate is secured at the piston by means of a snap ring, and the switching device has an actuating plate for actuating an electric switching mechanism. The actuating plate is positively connected with the piston, with the compression spring at its end facing the switching mechanism being axially guided by the guide sleeve.
    Type: Grant
    Filed: September 16, 1986
    Date of Patent: June 14, 1988
    Assignee: Alfred Teves GmbH
    Inventors: Dietmar Gath, Armin Eiser, Peter Grone
  • Patent number: 4742194
    Abstract: Improvement to electro-fluid relays useable to signal either the maximum or minimum limit of pressure in a fluid system, or the position of a movable part of a jack.The relay is constituted of a pipe fitting (1,2) attached directly onto an apparatus (5) or onto a pipe and including a body presenting a pneumatic control inlet (6) in communication with the said apparatus or the said piping, the said control inlet (6) being linked to a space situated on one side of an elastic membrane (16) submitted to the fluid pressure established in the control inlet (6), the said membrane (16) being linked by a transmission member (18) sliding in the body to a means of control (22) of an electric contactor (23).The invention is utilized for the control of a jack.
    Type: Grant
    Filed: February 2, 1987
    Date of Patent: May 3, 1988
    Assignee: Societe Anonyme Styled Legris
    Inventors: Andre Legris, Charles Columb
  • Patent number: 4724289
    Abstract: A pressure switch assembly includes an electric switch which is actuated in response to a preselected pressure in a pressure line. The assembly includes an activating rod which is engageable with the electric switch. The activating is acted upon by opposing forces from the pressure and a spring. The spring bears against a stop ring which is threadedly mounted so as to be displaceable in order to adjust the spring force. The stop ring is rotated by rotating a cover portion of the switch housing, the cover being connected to the stop ring. Thereafter, the cover is locked against rotation.
    Type: Grant
    Filed: January 21, 1987
    Date of Patent: February 9, 1988
    Assignee: Robert Scheuffele GmbH & Co. KG
    Inventor: Gunther Heissler
  • Patent number: 4692575
    Abstract: A switch responsive to fluctuations in the level of a vacuum. A ball is contained in an upright chamber and is normally in contact with an actuating means in the chamber. The actuating means is normally biased to one position but is shifted by the weight of the ball to another position. The chamber is connected to the vacuum source so as to apply a lifting suction force to the ball. If the suction force exerted by the vacuum exceeds a predetermined level, the ball will be lifted from the actuating means thereby shifting the position of the actuating means and generating a signal indicative of the vacuum level. Means are provided to adjust the level of vacuum necessary to lift the ball from the actuating means.
    Type: Grant
    Filed: February 10, 1986
    Date of Patent: September 8, 1987
    Inventor: William J. Eberle
  • Patent number: 4552999
    Abstract: A time delay switch comprising a housing, an actuating device partially in and partially outside of the housing, a switch capable of being rendered to a first and a second state, biasing device and a compressible/expansional pneumatic device disposed in the housing for rendering the switch from a first to a second state; the actuating device is movable within the housing from a first to a second position from a portion of it outside of the housing; the switch is affixed to the actuating device; the biasing device is connected to the actuating device portion inside of the housing and to the housing itself so that the actuating device is biased towards its first position; and, the pneumatic device is aligned with the switch and compresses same causing the switch to be in its first state when the actuating device is in its first position and when the actuating device is in its second position and the pneumatic device is in its fully expanded state, the pneumatic device has a rate of expansion from its compressed
    Type: Grant
    Filed: July 23, 1984
    Date of Patent: November 12, 1985
    Assignee: Anteg, Inc.
    Inventor: Dulin L. Annas
  • Patent number: 4467155
    Abstract: Input force transmitted from a monitored process variable is applied against a displaceable double beam mechanism being opposed by a dual spring bias presettable individually to the separate set points of the switch. Comprising the double beam mechanism is an equalizer beam underlying a pair of scissor beams such that displacement force incurred by the equalizer beam is conducted through the scissor beams and supported push rods to operate the switch actuators. In a hi/lo set point embodiment two switches are separately actuated in a predetermined sequence while in a deadband embodiment a single switch is independently settable for make and break.
    Type: Grant
    Filed: May 6, 1982
    Date of Patent: August 21, 1984
    Assignee: Dresser Industries, Inc.
    Inventors: Christopher P. Grudzien, Jr., Leonard P. DelVecchio, Jr.
  • Patent number: 4454393
    Abstract: An electrohydraulic switching device adapted to supply electric control signals in dependence on pressure signals received includes a first piston adapted to be acted upon by the input pressure and spring-loaded in opposition to the input pressure, and a second piston positively engaged with the first piston to activate an electric switching element. The first and second pistons are axially slidable relative to each other by a predetermined distance. A retaining element engages the second piston to provide for a switch hysteresis. To avoid an impact on the limit values as a result of fluid temperature and viscosity variations, the second piston is carried in the retaining element by several circumferentially spaced contact points in that the retention element is an elastic, substantially annular body with open ends.
    Type: Grant
    Filed: August 26, 1982
    Date of Patent: June 12, 1984
    Assignee: ITT Industries, Inc.
    Inventors: Werner Volkmar, Bernd Schutt
  • Patent number: 4438305
    Abstract: A pressure switch device having a fire resistant welded assembly of corrosion resistant steel components exposed to the fluid medium which is being monitored. A flexible diaphragm constructed of corrosion resistant steel film is overlaid by a backing disc and backing ring both formed of corrosion resistant steel. Inside the backing ring is an elastomer disc which receives a stainless steel piston that moves up and down in response to changes in the fluid pressure applied to the diaphragm through a pressure port. The piston has a shaft which actuates an electrical switch in response to changes in the pressure of the fluid medium. The periphery of the diaphragm is secured by a pressure tight weld to the housing, the upper corrosion resistant steel disc and the backing ring to provide a fire resistant assembly which confines the pressure medium in the event of a fire.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: March 20, 1984
    Assignee: Sor, Inc.
    Inventor: James R. Johnson
  • Patent number: 4413549
    Abstract: An actuator mechanism for detecting the presence of the piston or other movable element of a fluid cylinder for reversing switch purposes and the like is disposed in the end cap of the cylinder and is engaged by the cushion spear on the piston to provide transverse linear motion for actuation of a microswitch. The mechanism consists of a slender rod supported for movement transverse to the motion of the piston, the rod having a shoe at its lower end which receives a plunger, the latter passing through a bore in the end cap and adapted to be cammed upwardly by engagement with the cushion spear. The shoe and plunger are spring-biased toward the piston and the upward movement against the bias serves to actuate a microswitch external of the end cap to signal the presence of the piston. In a design suitable for different size cylinders, the plunger is formed of square stock of appropriate length.
    Type: Grant
    Filed: June 18, 1981
    Date of Patent: November 8, 1983
    Assignee: Parker-Hannifin Corporation
    Inventor: Raymond J. Knable
  • Patent number: 4400602
    Abstract: A fluid pressure operated electrical switch has a piston element subject to an operating fluid pressure on its acting end face for actuating an electrical switch. The switch employs a limiting member for limiting motion of the piston element to a predetermined extent in order to prevent the switch from being damaged due to overstroke of the piston element. The limiting member includes a flange at the rearmost end of the piston element and an annular shoulder in a bushing which is closely fitted within a port of a switch body for the operating fluid pressure. The piston element is loosely fit in the bushing with the flange in engagement within the shoulder of the bushing such that the flange and shoulder cooperate to provide limitation of the stroke of the piston element.
    Type: Grant
    Filed: April 3, 1981
    Date of Patent: August 23, 1983
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Hiromu Kuromitsu, Yoshiharu Adachi
  • Patent number: 4323742
    Abstract: A switch which is actuated when a preselected fluid pressure differential is exceeded. A piston exposed to the pressure differential carries a plunger which contacts a lever arm mounted on a shaft. A spring normally prevents the shaft from turning but is overcome when an excessive pressure differential is applied across the piston. A switch arm mounted on the shaft actuates the switch in response to turning of the shaft.
    Type: Grant
    Filed: January 4, 1980
    Date of Patent: April 6, 1982
    Assignee: SOR, Inc.
    Inventor: Wayne A. Priest
  • Patent number: 4317971
    Abstract: An electrical limit switch valve, having an essentially rigid plastic structural composition, is adapted to conductively secure a fluid flow pipe. A covering flexible elastic membrane diaphragm separates a valve base and piped fluid from a spring loaded ON-OFF electrical switch. The push button detent of the ON-OFF switch is operated normal to the valve bore axis. A valve plug slidably moves on the valve bore axis, the plug bonded at the first valve plug face to the second face of the flexible diaphragm, and the valve plug stem operates the push button detent of the ON-OFF switch. An adjustable actuating first pressurizing spring, coaxially disposed in the valve top housing along the valve bore axis regulates the fluid pressure at which the ON-OFF switch is actuated. An adjustable second pressurizing spring positioned normal to the valve bore axis is adapted to operate on a second spindle controlling the valve plug movement at fluid pressures below atmosphere pressure, in the fluid flow pipe.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: March 2, 1982
    Assignee: RK Industries
    Inventor: Verlon C. Roth
  • Patent number: 4250360
    Abstract: A device designed to effect automatic activation or deactivation of electrically, hydraulically or pneumatically operated control means, comprising a body freely movable in an air-tight housing and in its normal position sealing an aperture, a spring-biased control member arranged in a conduit one end of which is connected to the chamber and the opposite end of which is closed by said control member, which member may be displaced in said conduit between an activating and a deactivating position, said displacement effected by the pressure differential or the pressure blance in said conduit on the opposite side of said control member arising as a consequence of said body being forced from its aperture-sealing position upon tilting of the housing past a predetermined angle or upon acceleration or retardation of a certain magnitude of said housing.
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: February 10, 1981
    Inventor: Gustav E. Svensson
  • Patent number: 4229629
    Abstract: The present invention is a miniature electric switch actuator comprised of a two-piece threaded housing, one section having a cylindrical cavity containing a miniature switch with wires attached and the adjoining section has an inlet port and a bore with a spring biased piston. The piston is retained in the bore by a snap ring which limits the progression of the piston. In response to pressure, the piston depresses the switch push button to a controlled depth.
    Type: Grant
    Filed: March 1, 1979
    Date of Patent: October 21, 1980
    Inventor: Eugene J. Pawlowski
  • Patent number: 4225760
    Abstract: A pressure fitting formed of fire resistant material, preferably stainless steel, contains a chamber communicating through an opening with a pressure responsive switch or other assembly formed at least in part of a less fire resistant material, such as aluminum, with a movable seal member being provided for transmitting force to a movable part of the assembly, and with a valve member which is also high temperature resistant being provided to automatically close off fluid flow from the chamber through the opening in the event of fire. The temperature response may be obtained by release of the valve resulting from melting down of part of the pressure responsive assembly, or by melting of a fusible element retaining the valve in open condition, or by both of these effects.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: September 30, 1980
    Assignee: International Telephone and Telegraph Corporation
    Inventors: Donald L. Griffith, Lawrence A. Dunham
  • Patent number: 4172971
    Abstract: A magnetic differential pressure indicator is provided for detecting and indicating a pressure differential thereacross that is greater than a predetermined value in a fluid system. A thermal lockout effective even at high internal fluid pressures prevents false actuation of the magnetic indicating means at low temperatures due to increased viscosity of the system fluid.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: October 30, 1979
    Assignee: Pall Corporation
    Inventors: Bernard F. Silverwater, Charles Grimm
  • Patent number: 4158120
    Abstract: An electric switch actuator having a housing with a switch cavity and an associated bore. A spring biased piston is contained within the bore and actuates the switch in response to pressure. The switch cavity is closed by a transparent window allowing the switch actuation to be viewed.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: June 12, 1979
    Inventor: Eugene J. Pawlowski
  • Patent number: 4152559
    Abstract: There is shown a pressure responsive device for operating an electric switch plunger, the device having a port to receive fluid under pressure for application to a slidable piston that engages a pressure plate arranged to actuate a snap action disc spring, and thereby actuate the switch plunger via a combination motion doubler and pressure level setting mechanism. Such mechanism includes a yoke member extending from the snap spring to the switch plunger, and a helical spring surrounding the yoke and which at one end engages the pressure plate and at its other end is coupled to an adjustment member that is threaded on a housing that surrounds the helical spring and yoke member.
    Type: Grant
    Filed: November 4, 1977
    Date of Patent: May 1, 1979
    Inventor: Allen V. C. Davis
  • Patent number: 4124087
    Abstract: The invention provides a device for activating a passenger restraining system in a vehicle comprising, a dash-pot assembly arranged to be operatively mounted between the vehicle structure and a bumper on the vehicle, the dash-pot assembly including a cylindrical tube, a closure across the tube and a piston movable in the tube to form with the closure a chamber for pressure fluid in the tube, throttle means in communication with said chamber arranged to control exit of pressure fluid from the chamber and to damp movement of the piston relative to the tube whereby to dissipate energy, and a sensor mounted as an assembly with said tube, the sensor including an electrical switch operable in response to fluid pressure in said chamber.
    Type: Grant
    Filed: December 12, 1975
    Date of Patent: November 7, 1978
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventor: Manfred Bortfeld
  • Patent number: 4051338
    Abstract: A load responsive switch actuator mechanism comprises a body of deformable material (e.g., an elastomeric material) which deforms under either compressive or tensile forces to actuate a switch. In one preferred embodiment the deformable material is in the form of a solid, generally cylindrical configuration which, when compressed, will expand in diameter to actuate a load responsive switch. In a second preferred embodiment the deformable material is in the form of a generally cylindrical tube which, when subjected to a tensile load, will decrease in diameter and actuate a load responsive switch.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: September 27, 1977
    Assignee: Greer Hydraulics, Inc.
    Inventor: Newton T. Harris, III
  • Patent number: 4028511
    Abstract: A pneumatic jack for electric welding comprises a cylinder which houses a piston the connecting rod of which is connectable with an electrode. The piston rod is movable between a retracted and an extended position and at the closed end of the cylinder an electric switch is located in a recess and is embedded in electrically insulating material. The switch is provided with an operating rod which extends into a passage effecting communication between the bottom of the recess and the interior of the cylinder and which operates the switch when the piston in the cylinder is in the retracted position thereof.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: June 7, 1977
    Inventors: Andre Wack, Robert Bezicot, Andre Cosset
  • Patent number: 3937912
    Abstract: The circuit control unit of the present invention comprises a piston-type pressure responsive member or gauge wherein one end of the piston extends beyond the gauge body and carries an actuator which is movable with the piston. A circuit control member is mounted for actuation by the actuator for controlling an external electrical circuit in response to changes in fluid pressure as detected by the pressure responsive member. Where desired, an indicator may be mounted in fixed relationship with the pressure responsive member, providing means for visibly indicating the pressure of the fluid and the position of the piston with respect to the pressure responsive member.
    Type: Grant
    Filed: September 30, 1974
    Date of Patent: February 10, 1976
    Assignee: Martin Industries, Inc.
    Inventor: Clyde J. Martin
  • Patent number: RE34175
    Abstract: A hollow float bulb or shell is secured to a flexible electrical cord and encloses a housing which confines an electrical switch and defines a chamber with an inwardly projecting barrier. A weight member in the form of a metal ball is disposed within the chamber and rolls over the barrier to actuate the switch in response to tilting movement of the shell and housing. In one embodiment, a shuttle in the form of a metal frame is supported within the chamber for sliding movement and carries a switch conductor element. The shuttle frame is impacted by the ball located within the frame when the ball rolls over the barrier, and the frame is restrained by magnets to produce snap actuation of the switch.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: February 9, 1993
    Inventors: Richard V. Grimes, John W. Good