Abstract: A circuit breaker includes a rectangular box-shaped intermediate housing and lower housing; a power supply side fixed contact and a load side fixed contact disposed in the intermediate housing and facing each other; and a movable contact housed in the lower housing for bridging the power supply side fixed contact and the load side fixed contact. The lower housing has arc gas emission holes formed in front and rear walls thereof, and is connected to a lower part of the intermediate housing via an engagement part such that the lower housing covers the lower part of the intermediate housing. A thin wall portion is formed in each of the front and rear walls to eject arc gas by bending.

Abstract: A refrigeration apparatus containing a thermostat, adapted for use in a food storage compartment potentially containing a flammable gas, includes a thermostat and an enclosure forming a chamber configured to house the thermostat. The enclosure has two umbrella-type check valves configured to permit gas to pass into the chamber or out of the chamber when a predetermined pressure differential exists between the chamber and the food storage compartment. The enclosure forms a seal with the thermostat so that gas only passes through the check valves.

Abstract: An improved fire detector vented to atmosphere, capable of closing or opening an alarm circuit on the happening of either two events, when the rate of rise of the temperature of the ambient atmosphere exceeds a predetermined prescribed rate of rise of temperature and when the temperature of the ambient atmosphere exceeds a predetermined fixed temperature, the detector being of the type comprising a base supporting a diaphragm enclosing a space between the base and diaphragm, a shell secured to the base enclosing the diaphragm, vent apertures through the base from the space between the diaphragm and shell, and between the diaphragm and base, to the back of the detector, and a fin for collecting heat from the ambient atmosphere. The vent aperture permits the spaces between the diaphragm and base, and shell and base to be vented to atmosphere under normal expansion and contraction of the ambient atmosphere.

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.

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.