Abstract: A cartridge-type electric immersion heating element having an integrally contained, self-limiting thermostatic control included in its electrical circuit includes an electric resistance heating element embedded in compacted powdered insulating material partially filling a tubular metallic sheath open at one end. A preset thermostat is located within a thermostat sleeve positioned in close proximity with the sheath wall and has an end embedded in the insulating material. The thermostat is connected in series circuit with the heating element and the ends of power supply leads enter the sheath through the open end thereof. A body of potting compound, such as epoxy resin, completely fills the remainder of the sheath, seals the open end thereof and encapsulates the other end of the sleeve and the power supply lead ends whereby the sleeve and thermostat are securely held in position in the sheath.

Abstract: An electrically heated container for boiling liquids is provided with a thermally sensitive electrical control including a switch-on-dry protector switch unit directly connected with the cold leads of an electric heating element located externally of the container and in contact with the bottom wall thereof. The protector switch unit includes a thermally sensitive switch means enclosed in a protective housing having projecting terminal pins engageable by a female socket connector. The protector switch unit is mounted on a thermally conductive mounting plate located externally of the container and in contact with the heating element. The plate is enclosed by a detachable base member on the container. A steam-sensitive switch unit is mounted on the protector switch unit and includes a thermally sensitive element arranged to be impinged by steam produced by liquid boiling in the container and mechanically coupled to the switch means of the protector switch unit for deenergizing the heating element.

Abstract: A construction is provided for a dead case thermostat which allows for the operating parts and separators of the thermostat to be held in place, within the case, without crimping of the case and with little, if any, danger of breaking of the ceramic insulators.

Abstract: A heat operated protective switch, with a housing, with a bimetallic snap disc guided peripherally in the housing, with a contact adapted to be operated by the bimetallic snap disc, and also with an associated contact. The contact and the associated contact are connected in electrically conductive manner to one another by way of contact surfaces in a low temperature position while when a predetermined temperature is exceeded the bimetallic snap disc snaps over into a high temperature position and lifts the contact away from the associated contact. The contact has a circumferential edge whereby its contact surface coming into contact with the associated contact is set off sharply from the bimetallic disc. Thus operationally caused impairment of the switch-over behavior of the bimetallic snap disc, more particularly impairment caused by switching sparking is obviated.

Abstract: An electric heating appliance such as a coffeemaker, has a metallic base with an upper exposed surface and an electric heater on its lower side for heating the surface by conduction. A thermostat comprising a plastic-walled packaged unit with an opening through which an internal bimetal sensor is exposed is provided for controlling the heater and is mounted in a depressed niche formed in the surface of the heater. A detachable U-shaped metallic cover covers the opening and includes a heat-conducting projection extending through the opening very closely adjacent the sensor. The thermostat is positioned so that the cover faces and abuts the surface of the niche and a flexible clamp secures the thermostat in the niche and biases the projection and sensor closely together for fast thermostat response. The base may be an aluminum casting with the heater comprising a cast-in circular sheathed electric heating element.

Abstract: A thermostat assembly is disclosed which includes a bracket for attaching a thermostat to a tubular member, such as a pipe or tube, so that the thermostat may be reactive to the thermal condition of the tubular member. The bracket includes a longitudinal opening so that the bottom of the thermostat may directly contact the tubular member. The bracket also includes thermostat-retaining portions, each of which preferably includes an inwardly extending tab having a lance on the end to dig into the cement on the top of the thermostat. The bracket also includes clip portions which extend around and attach the bracket to the tubular member.

Abstract: A device for sensing overheating of bearings comprises a high-heat-conductivity metallic (copper) sheet adapted for shape-conforming fixed face-contact with an exposed surface of a bearing assemblage. A flat-bottomed brass cup is fixed to the upper surface of the copper sheet, as by pop-type rivets passing through flanges extending laterally from the cup bottom. A snap-disc thermostat lies within and against the bottom of the cup for good heat-exchange with the cup and with the sheet and thus with the bearing assemblage. The cup houses a pair of normally separated switch arms, one of which is engageable by a button of insulating material (attached to the thermostat disc) when the disc snaps to its bearing-overheated position. The device is housed by a piece of plastic tube that snugly embraces the end of the sheath of a two-wire insulated cable electrically connected to the switch.

Abstract: A cradle assembly for supporting a pair of switch means adapted for operation at predetermined trip points. The cradle has a pair of means for mounting the switch means pivotally arranged with each other and adjustably movable toward an adjusted position to establish the predetermined trip points of the switch means, respectively. The mounting means include a pair of integrally formed means adapted for fixed interconnection with each other to prevent pivotal displacement movement of the mounting means from the adjusted position thereof and positively maintain the predetermined trip points of the switch means.

Abstract: A miniature device for sensing overheating of bearings has a small flat-bottomed circular cup (e.g. fifteen millimeters in diameter) and has an integrally connected co-axial heat-conducting rod extending downwardly from its lower surface for good heat-exchange insertion into a bore made for it in a bearing element. The rod is preferably threaded to improve both its anchorability and its heat-exchange value. A bimetallic snap-disc thermostat lies in and on the bottom of the cup. A small inverted cup of electrically insulating hard plastic has a beaded lip embraced by the crimped rim of the metallic cup to form a housing for a normally closed switch whose spring-arm contact elements are fixed to the inverted plastic cup. An insulating disc closes the bottom of the inverted cup, forms a shallow retaining chamber for the snap-disc, and is centrally axially bored to serve as a guide for an insulating pin by which the thermostat disc operates the switch.

Abstract: A selectively mountable cold control device of the type utilized by servicemen for effectuating temporary repairs wherein the device employs alternative mounting means. In the first instance, where the cold control service is to be of a temporary nature, a pair of suction cup mounting members are utilized so as to retain the cold control device in operative relationship with the appliance with which it is used. Alternatively, where the replacement is to be of a permanent or quasipermanent nature, a singular grappling hook mounting member is utilized instead of the suction cup members. The housing of the cold control device is so configured so as to allow selection of either mode of mounting the cold control device with refrigerators, coolers and similar such appliances.

Abstract: A motor starting relay particularly adapted for use in starting single phase asynchronous motors comprises a resistor element of positive temperature coefficient of resistivity which is compactly arranged within a housing and engaged by electrical contact and terminals means of particular structure and of a material of relatively high thermal resistance in a novel way such that power dissipation or loss by the resistor is reduced to a very low level after it has performed its motor starting function but so that, at the same time, the resistor is adapted to cool more rapidly after interruption of motor operation to permit prompt motor restarting.

Abstract: A housing is disclosed in which a positive temperature coefficient (PTC) of resistivity element is mounted a selected distance from but in thermal communication with a thermostatic switch also mounted within the housing.

Abstract: An automobile engine coolant heater for connection to hoses of the engine coolant systems has a elongated cylindrical jacket portion defining a coolant flow path from an inlet at one end to an outlet at the other end. A metal sheathed heating element is located within the flow path and includes elongated heat generating leg portions. A thermostat for regulating operation of the heating element is mounted in heat conductive relationship on a flattened exterior portion of the jacket. An elongated, open ended metallic heat transfer tube provides a thermal bridge between the heating element leg portions and the interior surface of the flattened portion of the jacket. The heat transfer tube and heating element legs are in axial alignment with the longitudinal axis of the jacket to minimize flow resistance through the flow path. The heat transfer tube is brazed to the leg portions and to the flattened portion.

Abstract: A thermally responsive motor protector device particularly adapted for protecting a small electrical motor against both overcurrent and overtemperature conditions in an environment requiring hermetic sealing of the protector has a structure which provides the device with the desired hermetic seal and with a very small thermal mass for achieving the desired speed of response to overcurrent and overtemperature conditions in a small motor while also permitting mass production and automatic calibration of the device at low cost and inexpensive installation of the device without risk of loss of calibration.

Abstract: The assembly of an enclosure containing a fluid, and a capsule comprising a casing which contains a heat-sensitive element, the capsule being mounted in a wall of the enclosure through a mounting arrangement comprising a metal part forming one end of the casing and engaging the heat-sensitive element, a seat formed in the wall and having a bottom provided with an opening which opens into the interior of the enclosure, a lateral orifice which opens to the outside, and an inner surface having an annular zone between the opening and the orifice, and means for inserting and holding the capsule inside the seat to seal the opening by urging the metal part towards the annular zone with the possible interposition of a seal.

Abstract: A thermostat includes a bimetallic snap-action disc for actuating an electrical switch, a stop engaging one edge portion of the disc, a switch contact operating member engaging an opposite disc edge portion, and a fulcrum disposed between the disc edge portions and about which the disc moves whereby to amplify the movement of the disc. The fulcrum is formed by an appropriate shaping of a base wall of a thermostat housing. The switch contacting operating member is arranged to act on a leaf spring mounting a movable switch contact that engages the free end of a tongue formed by a U-shaped slot within the leaf spring whereby to permit overtravel of the disc without causing significant alteration of the disc opening temperature.

Abstract: A compact, low cost, snap-acting thermostatic switch which can be automatically assembled comprising a single member housing, an unrestrained snap-acting disc, a stationary contact means and a movable contact means with a transfer means attached thereto in which calibration in assembled form can be performed as a single final operation.

Abstract: A bimetal snap disc thermostat is disclosed in which a steel disc cup is provided for strength and/or environmental resistant properties. Positioned within the disc cup is a disc seat formed of aluminum. A bimetal snap disc is positioned in the disc seat and operates the thermostat switch through an axially movable bumper. A ring of rubber like foam material is positioned between the body assembly and the disc on the side of the disc remote from the disc seat. The aluminum disc seat reduces temperature calibration drift of the disc during the cycling of the disc which occurs during the use of the thermostat. The foam ring also tends to reduce bouncing and thereby tends to reduce temperature calibration drift. Also the ring functions to insure that the disc remains properly seated in its aluminum disc seat.

Abstract: A thermostat for mounting on a wall, including a base having an aperture for mounting on the wall, a temperature sensing means mounted on the base and adapted to move with changes in temperatures, and switching means mounted on the base and adapted to operate when the temperature sensing means reaches a predetermined temperature. Also included are restraining means removably attached to the switching means and adapted to restrain the switching means during shipment of the thermostat from the factory to the place of installation, the restraining means being positioned in the aperture to prevent mounting of the base to the wall without removal of the restraining means from the switching means.

Abstract: A motor protector characterized by low cost, by improved service life and by improved cycling properties has a bimetallic element mounted in a metal housing to move a first contact along a selected axis to engage and disengage a complementary contact in response to changes in element temperature. An electrical resistance heater coil, preferably with less than one full coil convolution, is oriented and secured externally of the housing so that the axis of the magnetic field established by the heater coil is coincident with the axis of movement of the first contact.

Abstract: A snap-action thermal switch having a housing with an open hollow portion at one end with a central enlargement of the housing in the hollow portion; a central cavity in the other end of the housing extending into the central enlargement; a pair of opposed slots communicating between the hollow portions; through the enlargement into the cavity with stationary contact in the hollow portion extending through the slot into the cavity; the widest points of the internal rectangular cavity being equal to or greater than the width of the enlargement.

Abstract: A thermostatically controlled system is disclosed in which the thermostat is exposed to a zone of high moisture content. In order to prevent the accumulation of moisture within the thermostat which could cause tracking failures or over pressure failures in the device a vent opening is provided which vents the interior of the thermostat to a zone of low moisture content. The vent prevents the occurrence of vacuum within the thermostat and thereby eliminates the pumping of moisture into the thermostat from the zone of high moisture content. Also the vent allows for the escape of any moisture which might penetrate into the thermostat interior.

Abstract: A thermostat includes a switch and an ambient temperature sensor that controls the switch. Both the switch and the ambient temperature sensor are supported by a support area of a base plate in a calibrated relationship. The base plate includes a pair of mounting strips each of which is parallel to and offset from the support area of the base plate, connected to the support area by a pair of narrow stress-isolating legs at the ends of the strip. The legs extend from integral stiffening parts of the base plate extending upright from the area of the base plate supporting the switch and the temperature sensor.

Abstract: A thermostat construction having a first contact and a blade-carried second contact supported in a generally cube-like housing and having a bimetal snap disc carried by the housing for controlling movement of the second contact relative to the first contact in response to snapped temperature sensing conditions of the disc together with temperature setting means carried by the housing for selecting the temperature of operation of the disc for moving the second contact out of contact with the first contact whereby the generally cube-like configuration of the housing renders the thermostat construction relatively small and compact.

Abstract: A structurally simple thermostat is disclosed in which a single rivet provides the mounting of all of the switch elements. The switch elements are located by the rivet and by a portion of the contacts substantially spaced from the rivet to minimize the affect of manufacturing tolerances in the positioning of the switch elements. A single terminal element supports the movable contact, provides a terminal extension and closes the switch cavity. The structure is arranged so that ceramic material can be used for the non-metallic parts with a minimum effect created by the relatively loose dimensional tolerances required in the manufacture of ceramic parts. The terminal member is formed with a shallow dish shaped projection which prestresses the rivet assembly to prevent looseness resulting from differential expansion.

Abstract: A thermally responsive electrical switch characterized by low cost and long reliable service life includes a precalibrated snap-acting thermostatic member which is positioned outside the electrical circuit of the switch in heat-transfer relation to heater terminal means in the switch, whereby the member is economically mounted without requiring calibration during or after switch assembly and is arranged to avoid the deleterious effects of high current surges in the switch but is responsive to the occurrence of selected current levels in the switch to open the switch with snap action. Preferably spring biased cam means cooperate with the snap-acting member to permit initial snapping movement of the member while the member is free of significant loading, thereby to assure that such snapping movement occurs at precisely predetermined temperatures throughout the life of the switch.

Abstract: A temperature responsive electrical switch construction having a housing provided with a chamber therein. A pair of spaced apart contacts project into the chamber and are adapted to be bridged by a bridging member disposed in the chamber and being operatively interconnected to a bimetal member also disposed in the chamber whereby movement of the bridging member relative to the contacts is in relation to the sensed temperature of the bimetal member. The housing has a threaded adjusting arrangement for initially adjusting the contact pressure between the contacts and the bridging member when the bimetal member is sensing a certain temperature without effecting the operating temperature of the electrical switch construction.