Abstract: A thermally responsive switch includes a hermetically sealed container including a metal housing and a header plate, at least one conductive terminal pin hermetically fixed in a through hole, a fixed contact fixed-to the terminal pin in the container, a thermally responsive plate having one end connected via a support to an inner surface of the container and reversing a curvature direction at a predetermined temperature, and at least one movable contact electrically conductively secured to the other end of the thermally responsive plate. Each contact includes a silver-tin oxide-indium oxide system contact. The container is filled with a gas containing helium ranging from 50% to 95% so that an internal pressure of the container ranges from 0.3 to 0.6 atmosphere at room temperature.

Abstract: A thermally responsive switch includes a container including a metal housing and a header plate, at least one conductive terminal pin inserted through a hole of the header plate, a fixed contact fixed to the terminal pin, a thermally responsive plate having one of two ends conductively connected via a support to an inner surface of the container and reversing a direction of curvature at a predetermined temperature, and at least one movable contact electrically conductively secured directly to the other end of the thermally responsive plate. Each contact is comprised of a silver-cadmium oxide system contact. The container is filled with a gas containing helium ranging from 50% to 95% so that an internal pressure of the container ranges from 0.38 atmosphere to 0.68 atmosphere at room temperature such that arc generated during opening of the contacts moves on surfaces of the contacts without spreading from the contacts.

Abstract: The thermal fuse according to the present invention has its conducting element made of red brass and, additionally, a thin layer of silver is coated over the conducting element. As such, the conducting element has substantially identical thermal coefficient as that of a red-brass casing, and the robustness against heat of the conducting element's petals is compatible with that of the casing. In this way, the conducting element will not be stuck with the casing when an overloading current emerges. The thermal fuse therefore is significantly more reliable than a conventional thermal fuse.

Abstract: A thermally responsive switch includes an airtight container including a metal housing and a header plate, conductive terminal pins airtightly fixed to the header plate, a fixed contact fixed to the conductive terminal pin, a thermally responsive plate one end of which is conductively connected to and fixed to the inner surface of the airtight container and the bending direction of which is reversed at a predetermined temperature, and a movable contact fixed to the other end of the thermally responsive plate. In the thermally responsive switch, the movable contact and the fixed contact are composed of a silver tin oxide based contact and gas containing 50% or more and 95% or less of helium is encapsulated in the airtight container in such a manner that gas pressure is equal to or more than 0.3 atmospheres and equal to or less than 0.8 atmospheres at ordinary temperature.

Abstract: The switch device comprises a pair of cavities, an elongate passage, a non-conductive fluid having a high electrical resistance, a conductive fluid having a high electrical conductivity and an electrical path. The passage is in fluid communication with the cavities and has a substantially elliptical cross-section over at least part of its length. The non-conductive fluid is disposed in each of the cavities. The conductive fluid is located in the passage. The electrical path is changeable between a connected state and a disconnected state by the non-conductive fluid separating the conductive fluid in the passage into non-contiguous conductive fluid portions.

Abstract: A combined pressure responsive electrical switch and temperature sensor device (10, 10′) is shown comprising a base member (12) mounting an electrical switch actuatable by a pressure responsive snap-acting disc (16) attached to a port fitting (22) having an elongated temperature sensing portion (22h, 22h′) extending from the fitting within a threaded bore of the fitting adapted to be inserted in the bore of a fluid pressure source nipple (2). A thermistor (24) is disposed at the distal end (22k, 22k′) of the temperature sensing portion and is electrically connected to terminals (14) of the base member.

Abstract: A capsule for use as a temperature responsive element in a temperature sensitive electrical switch. The capsule is provided in a transistor mounting can configuration to facilitate printed circuit board mounting. The capsule contains a fluid and a concave disc. At a predetermined temperature, the disc snaps-over into a convex configuration. Movement of the disc is detected to provide an output signal which is temperature responsive.

Abstract: The chamber in the metal body is filled with Freon which starts to vaporize at a temperature below the operating temperature of the switch. The vapor pressure increases substantially as the temperature rises above the refrigerant boiling point and acts against the diaphragm. The force in the diaphragm is opposed by the spring acting on the moveable seat which bears on the diaphragm pad. The pad carries a shorting bar which completes the circuit between the fixed contacts when the spring is overcome.

Abstract: A flame probe for use in an automatic pilot ignition system includes both a thermally responsive flame switch and a sensing electrode located in the flame for use in a flame conductivity sensing circuit. Separate conductive paths are provided for the flame switch and for connection to the sensing electrode and the conductive paths are completely insulated from each other.

Abstract: A salvage switch having a case which has therein a cartridge for containing a gas, an actuator and a spring for holding the cartridge in an inoperative position. Located beneath the case is a container having a hollow pin and containing a hydride. Upon actuation of the actuator the cartridge is forced forward against the force of the spring into an operative position wherein the hollow pin penetrates the cartridge.