Abstract: A thermostat reading enhancer is provided which includes an enhancer body adapted to be positioned adjacent a thermostat. The enhancer body can have at least portions thereof abuttingly contacting a mounting surface and retained in a position between the thermostat and the mounting surface or retained in a positioned adjacent the thermostat. The enhancer body also has substantially larger enhancer indicia than indicia on the adjacent thermostat visibly displayed on a surface thereof. The enhancer indicia align with the thermostat indicia in such a way that the enhancer indicia correspond directly to thermostat controls and settings. Methods of retrofitting an existing thermostat, installing and using a thermostat with enhanced reading are also provided.

Abstract: A push-pull circuit breaker is provided primarily for use in aircraft; wherein, the activation of the circuit breaker is made significantly more noticeable by the addition of a “flower” device. Specifically, as the center post of the circuit breaker deploys, “petals” at the periphery of the post expand outward. The petal expansion greatly enhances the visibility and thereby recognition of said circuit breaker deployment by flight crew or maintenance personnel. This design capitalizes on the safety and reliability of existent circuit breaker designs. Finally, the flower design incorporates only one part interlocked with the circuit breaker post to achieve the stated purpose.

Abstract: A temperature sensitive indicator 24 in the form of a label or decal is affixed to the outside of a thermal switch 20. The temperature sensitive label provides a permanent record of the temperature limits exposed to the thermal switch. The temperature sensitive material changes colors when the thermal switch is exposed to its predetermined temperature limit. The changed color provides a quick and clear indication of an event that caused switch activation. The color indication on the outside surface of the switch also provides a visual indication that is easy to acquire and inspect without the need to have physical access to the switch itself.

Abstract: A temperature sensitive indicator 24 in the form of a label or decal is affixed to the outside of a thermal switch 20. The temperature sensitive label provides a permanent record of the temperature limits exposed to the thermal switch. The temperature sensitive material changes colors when the thermal switch is exposed to its predetermined temperature limit. The changed color provides a quick and clear indication of an event that caused switch activation. The color indication on the outside surface of the switch also provides a visual indication that is easy to acquire and inspect without the need to have physical access to the switch itself.

Abstract: A device for indicating the conducting state of a fuse includes a heat generating material for generating heat in response to an electrical input and adapted to be coupled electrically in parallel with a fuse, and a temperature responsive material thermally coupled to the heat generating material for providing a visually discernable response if heated above a threshold temperature by the heat generating material.

Abstract: The indicating device (3) is used for signalling a faulty condition of an electrical apparatus, in particular of a surge arrester (1). It contains a sensor (resistor 10) which is located in an insulating material housing (6) and is intended for detecting a fault current flowing through the apparatus, as well as a two-piece metal housing (4) surrounding the insulating material housing (6). The sensor (10) and the insulating material housing (6) are part of a switching element (5). This switching element (5) causes the insulating material housing (6) to spring apart, by the formation of compressed gas, when the fault current occurs and displaces the two parts (shells 12, 13) of the metal housing (4), making the indicating element (16) visible and forming a DC connection which carries the fault current.

Abstract: A temperature sensor has a flexible nylon tube connected by a fluid-tight coupling to a metal bellows within a metal housing. The interior of the tube and bellows is filled with a pressurized liquid whose critical temperature corresponds to a threshold temperature to be sensed. The pressurized liquid holds the bellows extended, holding an actuating piston back against the action of a spring. When the threshold temperature is reached, the liquid in the tube must boil and ruptures the tube, causing the bellows to collapse and the actuating piston to move. A projecting actuator then mechanically initiates a response such as the closing of a damper in an air-conditioning duct.

Abstract: A freezer alarm system is energized by a battery (2) or an AC power adapter (3) to drive a piezo alert pulsing buzzer (4) when activated by one of two sensor modules. An electrolyte freezer alarm sensor (13) has a non-conducting wall (9) and two conducting elements (9), and it contains electrolyte solution (10) and a small air expansion space (11). Alternatively, a modified mercury switch freezer alarm sensor has non-conducting walls (9) which form a tube that is square in cross-section; two conducting elements (12) that are placed at separate points in the vertex of one angle; and contains mercury (15), freezable liquid (14) and an air expansion space (11). The modified mercury switch freezer alarm sensor can also be used as a sensor component of home burglar alarm systems which are activated by breaking a closed electrical circuit.

Abstract: A combined magnetic and thermal activated relay for use in alarm systems. The relay includes a thermal activated bimetal switch in series with the current through the magnetic coil which activates a magnetic switch. The thermal switch is in a normally closed state and the magnetic switch is in a normally open state. When current passes through the coil the magnetic switch changes from its normally open to a closed state applying voltage potential for an external requirement. The heat generated by the coil's resistance to current flow heats the core of the magnetic coil, and after reaching an elevated temperature level the thermal activated switch changes from its normally closed state to an open state opening the current flow path through the magnetic coil causing the magnetic switch to return to its normal open state removing voltage for the external requirement. The switching operation of the thermal switch cycles with temperature changes.

Abstract: A control system having a control unit provided with a single thermostatically operated control device for operatively interconnecting a heater to a source of energy when the output temperature effect of the heater is below a predetermined setting of a selector of the control unit and to disconnect the heater from the source of energy when the output temperature effect of the heater is above the predetermined setting of the selector, the single thermostatically operated control device also operating an indicating light to indicate that the output temperature effect of the heater is still above a certain value only when the selector of the control unit is in an "off" setting thereof. The selector of the control unit also operates a pilot light to indicate that the selector is set in an "on" setting thereof.

Abstract: A detecting device for detecting heat due to the presence of fire for example. The detecting device includes an open-ended chamber closed by a resilient diaphragm. The diaphragm engages the open end to permit respectively the passage of air via an annular passageway formed between an outer peripheral portion of the diaphragm and a circumferential rim of the open end which it engages for closing the chamber, upon pressure build-up in the chamber due to the external temperature variation. This pressure build-up causes corresponding expansion of the diaphragm to thereby actuate an electrical circuit provided with means for emitting an audible sound. Means are also provided in the detector to make it operative in response to the presence of moving objects.