Abstract: A heat sensing apparatus for a member requiring heat monitoring such as bearings, etc. is described. A heat conductive plate is secured to the lower end of a hollow cartridge and closes the open bottom of the cartridge. A heat sensing device is mounted on the heat conductive plate within the cartridge and has a pair of electrical wires secured thereto which extend outwardly through one end of the cartridge. A bushing is secured to one end of the bushing and has a nipple threadably mounted thereon. One end of a flexible conduit has a nut mounted thereon which is threadably secured to the nipple to provide a rodent and dust proof connection between the flexible conduit and the bushing mounted on the cartridge. An epoxy material is contained within the cartridge and at least a portion of the bushing to seal the interior of the cartridge and to protect the heat sensing device.

Abstract: The apparatus comprises a motor driven centrifugal pump having a suction line extending to a source of water which is located at a level below the pump. The discharge line of the pump extends to the area to be sprinkled in the event of fire. A sight glass is provided at a remote location and has a vacuum line extending from the lower portion thereof to the interior of the pump. A vacuum pump is connected to the upper portion of the sight glass for creating a vacuum within the sight glass, when actuated, so that a vacuum is created in the vacuum line extending from the sight glass to the pump so that water will be drawn from the source of water upwardly to the pump and thence to the sight glass. When a sufficient water level has been reached within the sight glass, the motor operating the centrifugal pump is energized so that water will be discharged onto the area experiencing the fire. The vacuum pump is controlled by means of an alarm system located in the area to be protected.

Abstract: A mounting bracket for a heat detector switch which not only provides a convenient means for mounting the switch on a bearing or motor but which also prevents the heat detector switch from being damaged while thereon. The bracket comprises a flat plate having a hollow tubular member mounted on the top surface of the plate member at one end thereof. A heat detector switch is mounted on the top surface of the plate adjacent the other end thereof and is electrically connected to an electrical wire which extends through the tubular member. A protective shield extends over the heat detector switch. The interior of the tubular member and the protective member are filled with a silicone rubber material. The heat detector switch is activated upon the motor or bearing reaching a predetermined temperature to activate a signal device electrically connected to the electrical wire in the tubular member.

Abstract: A material switch comprising a body having an open first end and a second end closed by a wall member. A flange extends outwardly from the body at the first end thereof for securing the body to a supporting structure. A backing plate removably closes the first end to define an interior body compartment between the backing plate and the inner surface of the wall member. A micro-switch is positioned within the body compartment and has a plunger extending therefrom so that the outer end thereof is positioned outwardly of the outer surface of the wall member. A pressure plate is removably mounted on the second end of the body at the outer surface of the wall member and is adapted to engage the switch plunger to actuate the switch upon movement of the pressure plate relative to the plunger. A flexible member is removably secured to the body at the second end thereof and covers the pressure plate. A ring member secures the flexible member to the body.

Abstract: A material sensing switch comprising a hollow body having open opposite ends. A backing plate is removably secured to the body for closing one of the opposite ends. A flange extends outwardly from the body at the other of the opposite ends thereof for securing the body to a supporting member. A switch support plate is removably mounted in the body adjacent the other end thereof and has a central opening formed therein. A switch is secured to the switch support plate at the inner side thereof and has a movable switch arm extending outwardly through the central opening of the switch support plate. A pressure plate is removably secured to the body at the outer side of the switch support plate for activating the switch arm. A flexible member is removably secured to the body and covers the pressure plate and the other end of the body. A ring-shaped member secures the flexible member to the body.