Abstract: A heat-responsive switch includes a case member, a deformation member deformed from a shape concave to an inside of the case member to a convex shape in response to a temperature variation, a first electrode having a first contact, a second electrode having a second contact and bringing the second contact into contact with the first contact with the first contact impelled to the deformation member, a first pressing member pressing the first electrode to separate the first contact from the second contact by having an end pressed by the deformation of the deformation member into the convex shape, and a second pressing member pressing the deformation member to restore the deformation member to the concave shape and pressing the second electrode to keep the first contact and the second contact separated by having the end pressed to the deformation member from an outside of the case member.

Abstract: A trip-free manual reset thermostat includes a first fixed contact and a second fixed contact for an electric circuit and a bridging contact having a first end and a second end in contact with the first and second fixed contacts, respectively, in a normally closed position. The bridging contact is tripped open and is not in contact with the first and second fixed contacts at a predetermined higher temperature. When a pushbutton is in a depressed position, the bridging contact is pressed toward the fixed contacts and the second end of the bridging contact is caused to pivot around the first end of the bridging contact. The thermostat does not require a narrow manufacturing and assembly tolerance to achieve a trip-free function and has a simpler structure and is easy to manufacture.

Abstract: A steam-responsive switch for use in an electrical water boiling appliance comprises a main body (12) from which extends a tubular portion (13) having at or near its leading end a heat responsive bimetal (16) extending across the mouth thereof which changes shape above a predetermined temperature defining a chamber behind the member and at the opposite face of the main body (12) an electrical contact pair, the bimetal (16) engaging on its rear face a slidable pushrod (20) which extends through the main body (12) in a sealed manner to act on the electrical contact pair, the tubular portion having a steam/air vent (64) at one side thereof adjacent the rear face of the bimetal (16).

Abstract: The invention concerns an electromechanical protective relay comprising deformable bimetal switches in the event of overload in power lines. A triggering mechanism acts on a flexible blistering segment (20) which can pivot by means of a support (30) on a fixed rest (17) and whereof the stem (21) has an extension (27) formed along the length of the segment and folded back in U- or V-shape to press elastically against a bearing surface (36) of the box so as to cause the segment to exert pressure on the pivot.

Abstract: A thermal switch includes a metal header plate having two through holes, two terminals inserted through and airtightly fixed in the through holes of the header plate, a metal housing including a cylindrical portion having an open end and a generally shallow dish-shaped bottom, the open end being welded to the header plate so that the metal housing and the head plate constitute a hermetic housing, and a thermally responsive element formed into the shape of a shallow dish and disposed on the bottom of the metal housing the thermally responsive element reversing its curvature at a first temperature with snap action and re-reversing its curvature at a second temperature with snap action to return to its former state.

Abstract: An electrical resistance heater is positioned adjacent to a bimetal disc in a thermostat for depressing the temperatures at which the disc snaps between oppositely bowed positions to open and close a switch. A thermal insulator interposed between the heater and the thermostat housing protects the housing against overheating and properly locates the heater relative to the disc. A dielectric film on the surface of the disc that faces toward the heater insures adequate electrical spacing between the heater and disc.

Abstract: A device (1f), which is e.g. provided as an overheating protection means for detecting the temperature on a heating device (4f), apart from a temperature sensor (3f), also has an insulating connecting piece (20f) with all the connecting elements (23f) necessary for the electrical connection of the heating device (4f), in such a way that these connecting elements (23f), following the fastening of the device (1f) to the heating device (4f), are accessible directly adjacent to the outer circumference thereof and to the associated face (31f) of a device base (19f), so as to produce the necessary connections.

Abstract: A bimetallic disc assembly for a bimetallic disc-actuated thermostatic switch includes a disc retainer, a bimetallic disc received in assembled position on the disc retainer and a metallic retainer cap for retaining the disc in assembled position on the disc retainer and for securing the assembly to the body portion of the thermostatic switch. The disc retainer is adapted to minimize heat flow from the metallic cap to the disc retainer by minimizing the areas of contact between the disc retainer and the cap. The disc retainer is integrally formed from a ceramic material and it includes a central hub having an axial bore extending therethrough, a circular flange extending radially outwardly from the hub, a circular shoulder extending upwardly from the flange, and a peripheral rim extending upwardly from the shoulder. The peripheral rim includes a horizontal edge with a plurality of circumferentially spaced projections or bumps which extend upwardly therefrom.

Abstract: a temperature switch is disclosed which has a bimetal disc being inversely deformed between a concave shape and a convex shape according to a temperature change. A bottom portion including the outer periphery of a casing of the temperature switch is in a plane shape. At an inner position of the outer periphery of the bottom portion, a protruding line for supporting an outer peripheral portion of the disc is formed. When the temperature switch is used in such a way that the outer surface of the bottom portion is in contact with a test subject, since heat is transferred from both iner and outer side walls of the protruding line to the disc, the delay of thermal transfer can be reduced.

Abstract: Upper and lower flexible blades carry normally closed contacts that are opened by upward movement of the upper blade responsive to snapping of a bimetal disc. The disc is reset by a pushbutton movable from a rest position to a depressed reset position. In its reset position, part of the reset button extends past the upper blade into engagement with the lower blade for moving and holding the lower contact away from the upper contact to prevent reclosing of the contacts until the pushbutton is moved back toward its rest position.

Abstract: A thermostatic switch assembly having three individual switches vertically stacked one above the other on a base containing temperature responsive bimetal discs that operate the individual switches through actuating rods.

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: Thermal switch having a thermal bimetallic snap-over disc temperature sensor which interacts via a transmission component with a contact system which has at least one contact carrier carrying or forming a movable contact, the movable contact resting against at least one fixed contact in the quiescent state. In order to ensure that the switch remains in the non-quiescent open position after the thermal sensor has been tripped, provision is made that the movable contact is formed by a wire-type or strip-type contact part which can be plastically deformed by the transmission component actuated by the thermal bimetallic snap-over disc temperature sensor.

Abstract: An improved temperature fuse is provided for electrical equipment having a heat transmission plate for holding a solder pellet and a control rod supported on, and prestressed against, the solder pellet. The improvement includes a solder pellet having a metal coating disposed on the entire periphery thereof. The metal coating has a higher melting point than the solder.

Abstract: A thermostatic switch has a contact arm which is adapted for reducing contact pressure and maximizing wiping action between fixed and movable contacts. The switch includes a housing, a pair of terminals mounted in the housing, a resilient contact arm connected to one of the terminals, a movable contact on the contact arm, a stationary contact connected to the other terminal, and an actuator assembly for opening and closing the switch. The contact arm is integrally struck from a resilient, electrically conductive metal and it includes a base portion, and a pair of supporting members extending outwardly and upwardly from the base portion and then bending back thereover merging into a main portion. The main portion includes a peripheral edge portion having a contact area, and a plurality of finger portions which converge inwardly therefrom and merge into an actuator portion.

Abstract: A manually resettable trip free thermostat that has simple construction and a pivotable stationary contact arm that enables the thermostat to be reset while maintaining the contacts in an open condition.

Abstract: Electrical switchgear apparatus comprises a base, a switching circuit element supported by the base and including at least one movable circuit element part, a thermal trip supported by the base for tripping motion in a given direction with respect to the movable circuit element part and a transmission device for imparting the tripping motion to the movable circuit element part, the transmission device comprising first and second members movable with respect to one another in the given direction to define a desired composite length for the transmission device in the given direction.

Abstract: An electric switch is shown which is responsive separately to two different conditions, i.e. temperature and pressure. The switch includes a temperature sensing disc and a pressure sensing disc both coupled through several alternate motion transfer arrangements to the movable electrical contact of the switch. Several structures are shown for mounting a switch on a surface so that the pressure sensing disc is exposed to fluid pressure and the temperature sensing disc is thermally coupled to the surface.

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 thermostatic switch comprised of a casing having fastened therein a beryllium plate, which is connected to a first conductor, and a contact plate, which is connected to a second conductor, a cap attached to said casing at the top, which has a ceramic rod movably fastened therein and controlled by a bimetal element to press on said beryllium plate or release therefrom causing said beryllium plate to connect said contact plate forming into a closed circuit or disconnect therefrom forming into an opened circuit, a fastening plate secured to said cap by a top cover for fastening the thermostatic switch to a heating unit to be controlled. The beryllium plate has a raised portion engaged in a hole on the first conductor and then fastened together to the casing by a rivet. The contact plate is integrally made on the second conductor and fastened to the casing by a rivet.

Abstract: A thermostatic switch having a switch case and disc cup cooperatively shaped for assembly in selective aligned relationship against relative rotation.

Abstract: A temperature responsive electric switch is shown having an operating bimetallic member adapted to sense the temperature of a heat source coupled to an over-center switch mechanism and an ambient temperature bimetallic member to maintain a predetermined temperature delta in the operation of a thermostat regardless of changes in ambient temperature.

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 snap action thermal actuator utilizes a pair of mechanically coupled bimetallic members having different temperature characteristics to provide a fast and positive snap action thermal actuator even when a low temperature differential is required. The actuator is particularly useful for controlling the operation of electrical contacts in a thermal switch.

Abstract: A disc assembly for a bimetallic disc-actuated thermostatic switch is adapted to minimize response time. The switch includes a disc assembly comprising a disc retainer, and a bimetallic disc and a cap on the disc retainer. The disc retainer includes a central hub portion, a plurality of fingers which radiate outwardly from the hub portion, a plurality of disc retainer projections on the fingers adjacent the terminal ends thereof and a plurality of disc support shoulders on the fingers adjacent the disc retainer projections thereon. The fingers have open notches therebetween for reducing the cross sectional area of the material available in the disc retainer for conducting heat from the bimetallic disc to the body portion of a thermostatic switch on which the disc assembly is installed.

Abstract: Driving element (1) comprising a thin part (2) provided with a zone, ductile in the direction of its thickness in such a way as to occupy at least two positions, in at least one of which said zone is arc-shaped, at least one tab (3, 4) fixed at one end to a face of said ductile zone and extending towards the central part of the zone in such a way that, when the zone is molded, the free end (8, 9) of said tab moves away from or towards the face (5) of said thin part, the resulting amplitude of the movement of the free end of the tab being greater than the amplitude of ductility of the thin piece.

Abstract: Driving element (1) comprising a thin part (2) provided with a zone, ductile in the direction of its thickness in such a way as to occupy at least two positions, in at least one of which said zone is arc-shaped, at least one tab (3,4) fixed at one end to a face of said ductile zone and extending towards the central part of the zone in such a way that, when the zone is moulded, the free end (8,9) of said tab moves away from or towards the face (5) of said thin part, the resulting amplitude of the movement of the free end of the tab being greater than the amplitude of ductility of the thin piece.

Abstract: A thermostat assembly includes a spring washer interposed between a switch case and a bimetal disc for biasing such disc into firm engagement with the disc housing to enhance heat transfer and dampen bouncing of the disc.

Abstract: The bimetal thermoswitch consists of an electrically insulating, flat carrier (1), at least two electric terminals (3, 4) which are secured to the carrier (1) and are respectively connected to a fixed contact (10), which is mounted on the carrier, and to a contact spring (8), which is secured at one end to the carrier (1) and at its other end carries a movable contact element (10), which cooperates with the fixed contact (10). The carrier (1) consists of an alumina ceramic slab.

Abstract: An electric switch, particularly a thermostatic switch, includes contacts connected to at least three terminal members having connector terminals aligned along a common axis.

Abstract: An element protector control for protecting the electrically powered heating element of a kettle against overheating has primary and secondary (or back-up) modes of operation. The primary protection mode utilizes a dished, snap-acting bimetal which is oriented so that the side of the bimetal which is convex when the blade is cold faces the heating element head, and the bimetal is sprung against a flat rear surface of the element head so that the bimetal in its cold condition flattens against the element head. The bimetal determines the condition of a pair of switching contacts provided in the control.

Abstract: A heat collector for thermostatic fire detectors comprises a one-piece circular metal member having a closed central depression that forms the bottom of a bimetal snap disc chamber in a thermostatic switch.

Abstract: A transfer element (8) is provided in a thermal switch (1) with a housing (2), power supply lines (4) and contacts (5) and (7), with a contact spring (6) and a thermostatic bimetal plate (3). The transfer element is moved up by the snap action of the thermostatic bimetal plate and in so doing takes with it the contact spring (6), opening the contacts. In order to adapt this transfer element (8) in its length precisely to the desired nominal length, a heating into the deformation range of the material forming the transfer element (8) takes place, with a subsequent deformation of the upper edge region. This makes it possible in a simple way to produce the exact nominal length of the transfer element (8).

Abstract: A thermostat comprises a generally circular supporting frame; a disk mounted on the frame movable between two stable positions in response to changes in the temperature of the disk, a pin slidable mounted in the frame for movement in response to movement of the disk between the two stable positions; an electrical contact switch including at least one movable contact responsive to slidable movement of the pin for opening and closing the contact switch; and spacers between the frame and the disk for reducing transfer of heat by conduction from the disk to the frame for increasing the thermal response of the thermostat.

Abstract: In a snap disc thermostat, a stationary contact support, a moveable contact support, an actuator translated by the disc and a case housing those elements, interior side walls of the case have guide channels outboard of the stationary and moveable contact supports. The actuator has a part substantially circular in section, extending within the guide channels, and a spherical part abutting the moveable contact support. The case has a closed top through which two contact terminals extend, and an open bottom through which the housed elements can be mounted. The open bottom is closed by an imperforate disc. The case has projections integral with the case, extending beyond the rest of the open bottom to center and retain the disc. A disc closure has recessed seats deeper than the projections, receiving the projections without bottoming, a flat surface within the compass of the seats, engaging the disc, and surfaces defining a plane outboard of the seats against which the disc closure abuts.

Abstract: A thermically controlled electrical switching element which is in the form of a temperature regulator or a temperature limiter. On a socket are arranged, in parallel orientation, a bimetallic spring plate, and a steel plate deflectable to both sides. The bimetallic spring plate is attached at its periphery in such a way that centrally, above a transition temperature, it can deflect in a first direction, and below a reverse transition temperature, it can deflect in a second, opposite direction. The steel plate attached at the rim together with the bimetallic spring plate, upon deflection of the spring plate, is also displaced in the first direction, and thereby, by means of a control element bearing upon its center, opens a switch contact interrupting the current flow to an electrical heating element.

Abstract: An over-temperature control for a thermostat uses an electrical contact actuator of a memory metal having an ability to change its physical configuration at a transition temperature to a "memory" shape. The contact actuator is arranged to bear against a cantilevered leaf spring having electrical contacts at a free end of the spring while the other fixed end of the spring is connected to complete an electrical circuit through the spring. The spring is also actuated by a bi-metallic element to produce a normal temperature responsive operation of the thermostat. The memory material actuator is arranged to provide a flexing of the spring cantilever to move the free end contact between a first and a second electrical terminal when the memory material is exposed to a transition temperature allowing the actuator to assume its "memory" shape.

Abstract: A thermal switch utilizes a bimetallic element which has first and second layers which each have a length greater than the width thereof. The bimetallic element operates a switching contact and is mounted in free floating relationship within a housing.

Abstract: A housing has a switch chamber in which an electric switch is placed and a recess in which is received a snap acting, thermally responsive disc which actuates and deactuates the switch upon snapping from one configuration to another. A drop in thermal biasing assembly used to modify the operating temperature of the disc has a pair of cylindrical film type resistors electrically connected in parallel circuit relation and physically connected to a pair of connectors. An assembly having resistors of a rating chosen for a particular application is dropped into the recess before the disc is assembled, the connectors sliding into matching bores formed in the housing. The connectors are attached to suitable teminals and the disc is then placed over the thermal biasing assembly to provide a multiple temperature operating thermostat.

Abstract: A temperature responsive switch having a bimetal disc disposed within a recess in the switch body is provided with a guide member having a hole extending therethrough and a sperical shaped transmitting member disposed in the hole in contact with the bimetal disc. A leaf spring is secured to the body at one end thereof in overlying relation to the hole in engagement with the spherical shaped transmitting member. A moveable contact is fixed to the other end of the leaf spring and a stationary contact is provided on the body adjacent the moveable contact. A spring normally disposed between the body and the leaf spring biases the leaf spring in a direction to separate the contacts and upon over center movement of the bimetal disc the spherical shaped transmitting member will move the leaf spring against the force of the spring to bring the contacts into engagement with each other.

Abstract: A thermoswitch in which two fixed terminals are provided to a base disposed in a bottomed housing and a movable contact mechanism is provided between the two fixed terminals so that the movable contact is connected or disconnected by the displacement of a thermosensitive member such as bimetal, wherein the basal portions of the fixed terminals projecting from the base after solidifed with a first resin and a recess formed by the housing and base is filled and solidified with a second resin such that lead wires connected to the fixed terminals are embedded in the resin. According to this device, penetration of water coming down along the lead wires is positively prevented by the two resin layers.

Abstract: A housing has a switch chamber in which an electric switch is placed and a recess in which is received a snap acting, thermally responsive disc which actuates and deactuates the switch upon snapping from one configuration to another. A drop in thermal biasing assembly used to modify the operating temperature of the disc has a pair of cylindrical film type resistors electrically connected in parallel circuit relation and physically connected to a pair of connectors. An assembly having resistors of a rating chosen for a particular application is dropped into the recess before the disc is assembled, the connectors sliding into matching bores formed in the housing. The connectors are attached to suitable terminals and the disc is then placed over the thermal biasing assembly to provide a multiple temperature operating thermostat.

Abstract: A detector thermostat for fire detection systems is disclosed. Such detector thermostat includes a bimetal snap disc thermostat having a metallic disc cup which supports the snap disc. A heat collector is mounted on the disc cup in good heat transfer relationship therewith. The collector provides a flange formed with concentric circular convolutions and a circular array of projections cut from the material of the flange and extending substantially perpendicular to the flange. The projections are positioned around the disc cup and provide improved sensitivity to the flow of hot air and gases in a direction parallel to the plane of the flange.

Abstract: A bimetal snap disc thermostat is disclosed which is structured for automated assembly. Such thermostat includes a body with contact supports molded therein in a manner providing sufficient strength so that terminals can be riveted onto the contact supports after assembly. The body and contact support subassembly is structured so that it is symmetrical on opposite sides of a central axis. A disc cup is provided with axial and radial surfaces which accurately locate the disc during and after assembly. Also disclosed is a method of gaging and calibrating the thermostat automatically. Calibration of the spring force of the movable contact is accomplished by sensing the force in a given position and subsequently deforming the spring until a predetermined force exists in such predetermined position. Gaging is accomplished by deforming a projection from the movable contact arm until a predetermined uniform spacing is established between such projection and a gaging surface.

Abstract: A single temperature sensing switch is responsive to two or more different ambient temperatures is disclosed. A contact mechanism made up of stationary and movable contacts is opened and closed by serially interconnected first and second temperature-sensitive members, which are made of shape memorizing alloys having different transformation points. The switch may be associated with a compressor of an automotive air conditioning system in order to prevent it from being heated beyond a siezing level or cooled beyond a liquid compressing level.

Abstract: A thermal switch having a temperature sensor formed of a thermal bimetallic nap disk, the temperature sensor cooperating via a transmission member with a contact system which has a contact carrier bearing at least one movable contact, the movable contact resting under spring force in its closed-circuit position of rest against at least one fixed contact. A locking member is provided which, upon a temperature-caused movement of the transmission member, is displaceable under spring force in the direction towards the transmission member at least approximately perpendicular to the direction of displacement of the transmission member and holds the contact carrier in its open-circuit position after temperature-caused movement of said support.

Abstract: In a cooking and heating apparatus, a device for warning personnel of dangerously hot temperature is incorporated within the structure of a thermostat which has a switch for regulating the flow of electric current to a heating element of the apparatus. The thermostat includes a push rod mechanically coupled to a finger-like termination which extends through an aperture in an arm of the regulating switch to engage the arm of a further switch used in activating a warning indication. A collar on the termination engages the arm of the regulating switch subsequent to the activation of the further switch by the rod. The rod expands with increasing temperature and, thereby, initiates the warning at a lower temperature than the temperature of the power cut off by the regulating switch.

Abstract: An adjustable bimetal snap disc thermostat is disclosed which provides conventional resistance-type heaters symmetrically positioned adjacent one side of the snap disc to allow adjustment of the operating temperature of the thermostat. The heaters are supported by heater terminals which extend up through the thermostat body and cover, and connect the cover to the thermostat body. The heaters and heater terminals are connected as a subassembly and subsequently installed as a unit in a device to minimize assembly costs. Further, since the heaters are conventional commercially available heaters, the cost of the heaters per se is minimized.

Abstract: In a bimetal controlled snap disc thermal switch for controlling the heating current to an electrical heating member, the switch including: a support plate arranged to be in thermal communication with the member; a bimetal snap disc which rests against the support plate to be in thermal communication therewith and which is formed to undergo a deformation dependent on its temperature; a switch element supported in the housing and operable for controlling the heating current, the switch element having a fixed contact and a movable contact; a contact spring carrying the movable contact and mounted for pivotal movement in the direction of the deformation of the snap disc; a movement transfer member movable in the direction of deformation of the snap disc and interposed between the snap disc and the contact spring for acting on the contact spring with play to pivot the contact spring in a direction to separate the movable contact from the fixed contact in response to a deformation of the snap disc; and a compressi

Abstract: A thermostat having a low force output, snap-acting thermally responsive bi-metal disc operative through a pushrod to move the blade of an SPDT switch at a pre-selected temperature. The switch has a cantilever blade formed of a unitary thin metal strip having a flexible stem with a first rigid tongue extending therefrom with a heavy current carrying moveable contact thereon for a normally closed contact set. The pushrod contacts the rigid first tongue for switch actuation. A second flexible tongue extends from the stem and has an integral low current normally open contact thereon for a contact set which is closed upon switch blade actuation. Upon further temperature rise, after switch actuation, pushrod over-travel on the first tongue is absorbed by resilient flexing of the stem and second tongue thereby providing a wiping action to the closed low current contact set.