Abstract: A protecting device for a car air conditioner includes a timer for timing a period of the rise in the level of a rotation signal delivered from a rotation sensor for detecting a rotational speed of a compressor with the signal being distinguished from noise. On the basis of the obtained period, a judgment is made as to whether rotation of the compressor is in an abnormal state. An electromagnetic clutch between the compressor and a car engine is controlled on the basis of the judgment. The protecting device is mounted on a housing of the compressor with the rotation sensor so that wiring is executed only in an engine room. The protecting device includes a state holding device for memorizing the abnormal state of the rotation of the compressor. The air conditioner can restart on condition that a conscious operation is performed to reset the state holding device.

Abstract: A seismosensitive element includes a housing formed from an electrically conductive material and having an inclined face formed on the bottom thereof to gradually rise concentrically outwardly substantially from a center of the inner bottom face, and a header fixed to the housing to close its open end and having through-aperture in which an electrically conductive terminal pin is fixed in an insulated relation. A contact is fixed an end of the terminal pin located inside the housing and has a plurality of feather portions disposed concentrically with the terminal pin, the feather portions having a predetermined elasticity. An inertia ball is enclosed in the housing to be located substantially at the center in the housing in a normal position of the element in a stationary state.

Abstract: A roll or tilt responsive switch includes a housing formed from an electrically conductive material and having an inclined face formed on the bottom to gradually rise concentrically outwardly substantially from the center of the bottom, and a header fixed to the housing to close its open end and having a through-aperture in which a terminal pin is fixed in an insulated relation. A contact is fixed to an end of the terminal pin located inside the housing and has a plurality of feather portions each having a predetermined elasticity and disposed concentrically with the terminal pin. An inertia ball is enclosed in the housing to be located substantially at the center in the housing in a normal position of the switch in a stationary state.

Abstract: An acceleration responsive switch includes a receptacle including a housing having a conical face on an inner bottom face and a header fixed to the housing to close an open end of the housing, a lead terminal fixed in a through-aperture of the header, a contact member secured to an end of the lead terminal located in the housing and including a plurality of feather portions arranged radially to be approximately concentric with the housing, an electrically conductive inertia ball enclosed in the closed receptacle so as to be capable of rolling on the inner bottom face of the housing, a plurality of protrusions formed an inner peripheral wall of the housing, an oscillation damping liquid contained in the receptacle and having a viscosity suitable to apply resistance to the inertia ball so that the inertia ball terminates its rotation when the inertia ball is subjected to an external oscillation to be rotated.

Abstract: A structure for mounting a thermal protector in a hermetic refrigeration compressor including an electric motor and a compressing means enclosed in a housing with refrigerant is disclosed. The housing has at least one through hole. The structure includes a terminal assembly airtightly secured in the hole of the housing. The terminal assembly includes a metal base and a plurality of electrically conductive terminal pins secured to the metal base by an electrically insulative material with small thermal conductivity. The structure further includes a thermal protector including a hermetic casing, a thermally responsive element disposed in the casing to be in direct contact with an inner wall of the casing at one side, and a contact mechanism.

Abstract: A fixing method and assembly of a temperature responsive element capable of detecting variation in temperature of discharge cooling medium of a compressor exactly and rapidly and preventing the compressor from being burned. A through hole is formed in a cover 6 which covers a path 7B for discharge cooling medium of the compressor. A plug 9 is fixed to the through hole from the side of the path by a fixing member 13. In this case, it is sealed airtightly by means of a packing. Lead terminal pins penetrating the plug 9 is insulatively fixed in the plug airtightly. Leads are connected to one ends of the lead terminal pins projecting outside and the temperature responsive clement 8 is connected to the other ends of the lead terminal pins projecting on the side of the discharge path. The temperature responsive clement 8 is disposed not to come into direct contact with a vessel and the cover 6 of the compressor and is exposed to discharge cooling medium as a whole.

Abstract: A thermal protector includes a metal housing having open and closed ends, a header plate secured to the housing so as to close its open end and having two through-apertures, first and second terminal pins hermetically secured in the respective apertures of the header plate so as to extend into the housing, a dish-shaped bimetal disposed on an inner bottom of the housing so that one of its two sides is in contact with the inner bottom face of the housing, an elastic support disposed in the housing to be opposite to the other side of the bimetal for supporting it, a pair of fixed and movable contact members welded to the first and second terminal pins respectively such that a straight line passing through the center of the first terminal pin and a location of the fixed contact member welded to the first terminal pin is approximately parallel to a straight line passing through the center of the second terminal pin and a location of the movable contact member welded to the second terminal pin and vice versa and f

Abstract: A thermally responsive switch for protecting electric motors against overcurrent and overheating conditions includes a metallic receptacle having an elongated dome-shaped portion and an opening opposite to the dome-shaped portion, a metallic header plate secured to the one end of the receptacle so as to hermetically close the opening afterwards and having a through-aperture, a thermally responsive element disposed in the receptacle in parallel with the header plate and carrying a movable contact at one end, a rod terminal secured in the aperture of the header plate by an electrically insulating material filled in the aperture for hermetic sealing so that the terminal extends through the aperture, a fixed contact support disposed in the receptacle to be perpendicular to the terminal and having an end to which a fixed contact is secured, the support being connected at the other end to the end of the terminal projected into the receptacle, by solder, and a spring for urging the support so that it is disconnected

Abstract: A three-phase thermal protector includes a hermetic receptacle composed of an elliptic dome-shaped cover having an opening at one end and a header plate having two terminal pins extending through respective apertures formed in it, and a switch assembly mounted in the receptacle. Two fixed contacts are secured to the respective terminal pins. The switch assembly includes a metal operating temperature calibrating plate with one end welded to the cover, a bimetallic thermally responsive element having one end secured to the calibrating plate and the other end having a central dish-shaped portion, and a thermally-responsive-element support to which the supported end of the thermally responsive element is welded. The thermally responsive element carries two movable contacts symmetrical about the center line.

Abstract: A thermally responsive switch includes an elliptic dome-shaped metal receptacle, a header metal plate hermetically secured to the receptacle and having a through-aperture at one of two longitudinal ends, an electrical conductor inserted through the aperture of the header plate and secured with an electrically insulating material such as glass, a support having at one of two longitudinal ends a fixed portion secured to the end of the conductor in the receptacle and a supporting portion positioned away from its other end in the direction of the fixed portion, a bimetal secured at one of its two ends to the supporting portion of the support and carrying a movable contact at the other end, the bimetal having a central shallow dish-shaped portion reversing its curvature with a snap action in response to the temperature, a fixed contact secured to the header plate in the vicinity of its other longitudinal end, and a calibrator interposed between the inner wall of the receptacle and the other end of the support oppo

Abstract: A thermal motor protector includes a cylindrical metal housing having an open end and a bimetal disposed in the housing so that its one side is opposite to an housing inner bottom. The bimetal has a shallow dish-shaped portion so that it inverts its curvature at a first temperature with a snap action and re-inverts its curvature at a second temperature. A support is disposed in the housing opposite to the other side of the bimetal and has a preselected elasticity. A fixed contact member is disposed in the housing, and a movable contact member is held by a stationary member in the housing so as to be movable relative to the fixed contact member. A pressure strip is formed separately from or integrally with the movable contact member so as to project from and to be moved with it, the pressure strip having a distal end in contact with the support so that a force is applied to the bimetal at a predetermined pressure.

Abstract: A thermal motor protector includes a first support for supporting a thermally responsive element and a second support for supporting a fixed contact. The first and second supports are mounted on and insulated from a header plate. The thermally responsive element is secured to the first support through a fixing strip and has a central shallow dish-shaped portion and carries a movable contact at its distal end. A calibration mechanism includes a male screw, a hole formed in the first support and elastically slender clamping portions clamping the screw when it is screwed into the hole. The diameter of the hole is smaller than the outer diameter of the screw. The stiffness of the fixing strip is determined so that variations in the ratio of the current bypassed into the calibration mechanism to the current flowing through the fixing strip and thermally responsive element can be substantially ignored.

Abstract: An acceleration responsive switch, for operating an air bag system installed in an automobile, includes a cylindrical receptacle for containing an electrically conductive liquid such as mercury and an inert gas, a metallic lid having an open end and hermetically secured to the open end of the receptacle, and a pair of electrodes having one ends extended into the receptacle through the open end of the lid, respectively such that the one ends of the electrodes are brought into contact with the conductive liquid when a shock acting on the receptacle causes the conductive liquid to move within the receptacle.

Abstract: A thermally responsive switch includes an elliptic dome-shaped receptacle, a support conductively secured at one of two ends to an inner surface of one of two ends of the receptacle in the direction of its length, a bimetallic thermally responsive element secured at one end to the other end of the support with the other end opposite to an inner surface of the other end of the receptacle in the direction of its length with a predetermined space interposed therebetween, the thermally responsive element carrying a movable contact on the other end, and a metallic lid secured to the open end of the receptacle so as to hermetically close the open end of the receptacle. The lid has a through-hole through which a terminal pin is disposed with an electrically insulative material charged in the through-hole. Alternatively, two terminal pins may be disposed through two through-holes respectively.

Abstract: A thermally responsive switch used in enclosed motor-compressors includes a supporter formed of a single metallic plate and including a support arm cantilever mounting a thermally responsive bimetallic or trimetallic element carrying a movable contact at one end, first and second beams disposed in a relation that the support arm is interposed between these beams, and an operative temperature calibration strip integrally extended from the first beam. The calibration strip is slidably inserted between the support arm and the second beam into a wedge structure in the state that the calibration strip is bent at the root portion. Consequently, when the calibration strip is bent with the slidable movement, the support arm is bent so that the contact pressure between the contacts is set, an amount of bending deformation of the support arm corresponding to an amount of bending deformation of the calibration strip.

Abstract: This invention relates to a three-phase thermal protector having two pairs of fixed and movable contacts for opening and closing the neutral of wye-connected phase windings of a three-phase induction motor.

Abstract: A structure for mounting a motor protector substantially as a thermally responsive switch in an enclosed electric compressor including an electric motor and a compressing means provided in a closed housing. The structure includes a terminal support provided air-tightly through an upper wall of the compressor housing, a plurality of conductive pins for connecting an external power-supply circuit to the motor, the conductive pins projecting inside and outside the terminal support. One of the inner conductive pins is conductively connected to a terminal pin provided in the motor protector or to an equivalent thereof. Thus, the motor protector is disposed and held within the compressor housing so that heat is exchanged between the motor protector and a coolant gas. A motor winding is connected to the other terminals and the other conductive pins provided in the terminal support.

Abstract: A thermally responsive snap-acting switch consists of an elastic plate cantilever mounted at one end on a header, a thermally responsive element which includes a central dish-shaped portion for inducing snap action and one end of which is connected with the other end of the elastic plate in an opposed relation to the elastic plate, a support one end of which includes a portion receiving a connection between the elastic plate and the thermally responsive element so that it slides and is inclined on the receiving portion, and a projection which exerts a force on the dish-shaped portion of the thermally responsive element to calibrate the operative temperature of the thermally responsive element. The calibration is performed either by employing a screwed stud as the projection or by plastically deforming the receiving portion of the support.

Abstract: A thermally actuated switching device is disclosed that comprises a fixed contact placed on a proper member, a thermally actuated member such as a bimetallic member in the center of which is formed of a thin dish shape which contributes to a snap-action caused by heating of the bimetallic member, a bracket keeping the thermally actuated member in the concave-formed condition, a movable contact, which contacts on or removes from the fixed contact and is secured on the free end of the thermally actuated member, and a heat-resistant arc shield cantileverly held on the free end of the thermally actuated member or on a proper supporting member against the movable contact mounted surface of the thermally actuated member, so that the arc shield protects the thermally actuated member from an arc being introduced to it and prevents the deviation of the operation temperature of the thermally actuated member at the open or close action.

Abstract: A thermally responsive switch device includes; a bimetallic plate enclosed within a metallic enclosure in a cantilever manner and having a central dish-shaped portion for snap movement. The bimetallic plate carries a movable contact at one free end to be in making contact relationship with a fixed contact which is placed into the enclosure. A calibrator projection is provided with the enclosure to engage with the dish-shaped portion to exert point pressure between the contacts. A reinforcer extension is disposed in the enclosure and has one end secured to the inner side of the enclosure and its other end sandwiching the dish-shaped portion in cooperation with the projection so as to prevent the cantilever support end of the plate from being deformed irrespective of often repeated snap actions of the plate in response to the ambient temperature or the like.