Abstract: A concealed adjustable temperature switch includes a fixed plate, an adjusting block threadedly engaged with a screw hole of the fixed plate, a bimetal plate, and a metal plate. Mounted on the adjusting block are upper and lower positioning rings and a fixing ring between the positioning rings. The fixed ring includes a hole through which the adjusting block extends. The fixing ring includes a stop projecting toward the fixed plate. The stop includes two sides having a height greater than a thickness of the fixed plate. A distance between the stop and a center of the hole of the fixing ring is greater than that between a front edge of the fixed plate and a center of the screw hole of the fixed plate and than that between either one of two sides of the fixed plate to the center of the screw hole of the fixed plate.

Abstract: A single bimetal automatic changeover thermostat has heating, cooling and changeover switches mounted to the bimetal. A single control point adjustment lever for rotating the bimetal has separate shaped heat and cool set point indicators which are movable along a temperature scale.

Abstract: There is disclosed a thermostat controlled apparatus which controls the operation of a heating system and a cooling system in response to temperature variations in a given environment. The thermostat has a three-electrode mercury switch which is coupled to a single bimetallic element which rotates the switch in response to temperature variations. The switch has a housing containing a pool of mercury and three electrodes extending within. A common electrode is connected to a voltage source. A second electrode is connected to the cooling system. A third electrode is connected to the heating system. Tilting the switch clockwise causes the mercury to connect the second and common electrodes, thereby energizing the cooling system; tilting the switch counterclockwise causes the mercury to connect the third electrode and common electrode, thereby energizing the heating system.

Abstract: In a hermetic type thermally responsive switch comprising a fixed contact support having a fixed contact at its end and cantilever disposed in a hermetically sealed vessel, a elongated support supporting a thermally responsive disk which has a movable contact and cantilever disposed in said vessel through a connecting means; said fixed contact support comprises laminated metallic sheets each having different elastic modulus, while a spacer means is interposed in electrically, thermally insulated relationship between said elongated support and said connecting means so as to calibrate the snap temperature of said disk.

Abstract: A thermostat device has control means movable between control positions on a base when a thermostat metal element moves with snap action in response to temperature changes. Angle-shaped mounting brackets of a relatively high strength metal material have respective legs fitted against a boss on the base periphery and a cup-shaped cap of a relatively more formable and more thermally conductive metal is fitted over the thermostat metal element on the base to enclose the noted legs of the brackets.

Abstract: A method of manufacturing a cradle adapted for use in a thermostat to support a plurality of switch means respectively adapted for operation at predetermined trip points. This method includes: fabricating from generally planar and thin material a plurality of cradle legs respectively having a pair of opposite end portions with at least one opening in one of the opposite end portions of at least one of the legs and at least one integral extension on at least another one of the opposite end portions of at least another one of the legs; and pivotally interconnecting the other of the opposite end portions of the legs with respect to each other and inserting the at least one integral extension means through the at least one opening.

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: An instrument which detects a rise in temperature of a surface; the instrument including a bimetal sensor disc which contacts a surface that is being serailled by the instrument, and which, when becoming overheated, causes the disc to snap into engagement with a contact strip, thus closing a warning alarm; and the instrument having adjustments to set off the alarm at a selected temperature.

Abstract: Disclosed are a switch structure and a calibration technique that facilitate the rapid and substantially automatic calibration of a switch of the type that responds to changes in an environmental parameter (e.g., a thermostatic switch). An abutment member (which will serve as the calibrated stop) is supported for preliminary movement with a switch movable member (e.g., a bimetallic arm) and is supported in a bracket which is capable of gripping the abutment member but which is initially prevented from doing so by the action of a member that stresses the bracket. The last-mentioned member is deformable (e.g., it melts) at a desired value of the environmental parameter, thereby resulting in the bracket gripping the abutment member (which then defines a stop for the switch's movable member).

Abstract: A thermostat having a cover plate rotatable about a central horizontal support in which a bimetal or other thermally responsive member supported on the cover plate actuates a mercury switch also on the cover plate. This cover plate also has upon it indicia such as degree marks or simply arrows indicating "colder -- warmer" operable against an imaginary vertical lubber line to indicate a setting. The need for time consuming and expensive levelling of the thermostat during installation is thus obviated because the thermostat is automatically levelled by the user as a result of setting the indicia in relation to the imaginary vertical line.