Abstract: A fire extinguisher box is composed of a box body in which a base frame and a link mechanism are mounted. The base frame is fastened pivotally with a seat for locating the fire extinguisher in the box body. The link mechanism is composed of an upright rod fastened with the base frame, a first link rod fastened with the upright rod, and a second link rod coupled with the first link rod and a pull rod of a door of the box body. As the door of the box body is opened, the link mechanism is actuated by the pull rod such that the base frame is driven by the link mechanism to locate at an inclined position, thereby causing the fire extinguisher to locate likewise so as to enable a person to remove the fire extinguisher from the box body easily and quickly.

Abstract: A forward-mounted fluid-dispensing boom on a fire-fighting vehicle that can move between a retracted position and a fully extended position directly in front of the vehicle.

Abstract: In the particular embodiments described in the specification, a sprinkler guard is formed from eight U-shaped wire members arranged uniformly about a sprinkler axis and joined at one end to a ring and at the other end to two opposed base plates which each receive four of the U-shaped members, leaving an opening through which a conventional sprinkler head can be inserted into the guard. The base plates have downwardly projecting portions with opposed surfaces to engage flat outwardly facing surfaces on the conventional sprinkler head and also have outwardly facing surfaces for receiving a wrench to mount the sprinkler head after the guard has been assembled on it.

Abstract: A fire extinguisher system is provided including a wall mount with an open front. The wall mount is adapted to be situated within an opening formed in a recipient surface such that the open front is in coplanar relationship therewith. Next provided is a housing having a closed front face with an aperture formed therein. A fire extinguisher is provided having an actuation assembly adapted to release the fire extinguishing material upon the detection of a temperature above a predetermined amount. The fire extinguisher is situated within the housing with the actuation assembly protruding from the aperture thereof. During use, the housing may be removably situated within the wall mount with the front face of the housing remaining in coplanar relationship with the open front of the wall mount.

Abstract: A fire alarm station pull cover with a rectangular box shape enclosure that is open in the front, back and bottom and has a removable cap. The cover is mounted to a wall fully encasing a fire alarm pull lever. A glass pane resides in grooves on both sides of the apparatus and is supported laterally by said grooves and vertically by a detent at the bottom of each groove. One or a plurality of equi-spaced vertical score marks formed on the pane of glass causes the pane to controllably break into parts when struck by a striker preferably attached by a tether to the cover. The sections of glass fall down and out through the open bottom to expose said pull lever and allow actuation of the lever.

Abstract: A portable fire extinguisher assembly includes a fire extinguisher with a tank containing fire extinguishing material, a valve for metering release of the fire extinguishing material, and a gauge displaying pressure within the tank, and a docking station in communication with the fire extinguisher. An electronic circuit in communication with the fire extinguisher and the docking station issues a signal upon detection of predetermined conditions, including at least one predetermined internal condition and at least one predetermined external condition. The fire extinguisher electronic circuit includes cooperative male and female electrical/communication connection elements defined by the fire extinguisher and docking station.

Abstract: The glass pane of an emergency equipment access panel is replaced by tempered glass as opposed to conventional annealed glass panels of the type available in the prior art. Tempering places the surfaces of the glass in a higher degree of compression while balancing tensile forces are confined to the interior. Because of the high degree of permanent stress induced in the glass by tempering, if any portion of the tempered glass is weakened, such as by cracking even an edge thereof, the entire structure virtually disintegrates into a large plurality of small, relatively harmless pieces, leaving no significant size shards of glass that might otherwise injure one's hand or arm reaching through the shattered glass to gain access to the interior of a cabinet for example. An edge breaking device provides a simple and convenient means for exploiting the high stresses built into tempered glass and produces the virtual disintegration of the glass panel even though only an edge portion thereof has been fractured.

Abstract: The extinguisher (1) includes a spray head (3) connected by a hose (4) to a tank (2) of fire-extinguishing product, and an activating mechanism (10, 11) is mounted on the tank. The spray head (3) includes a portion (25) which is shaped so as to engage with a part (11) of the activating mechanism (10, 11) when the spray head (3). is situated close to the tank (2); the activating mechanism (10, 11) then being in a position of nonactivation of the extinguisher (1). The shaped portion (25) of the spray head (3) separates from the engaged part (11) of the activating mechanism (10, 11) when the spray head (3) is separated from the tank (2), with this separation operating the activating mechanism (10, 11) so that the extinguisher (1) is activated.

Abstract: A siphon jet is attached to a dry hydrant which is in communication with a body of water to increase the flow of fluid to the dry hydrant and assist in overcoming the effects of atmospheric pressure and gravity in drawing the water. A pressurized fluid source can add fluid to the siphon assembly and this forces water from the body up the hydrant pipe. Also, the fluid from the pressurized fluid source can be added forward of a valve to fill the hydrant pipe which thus minimizes the duration of priming operations.

Abstract: A fire extinguisher bracket having a beacon for rendering the fire extinguisher conspicuous even in a darkened location. The bracket has structure for engaging the fire extinguisher and structure for mounting the bracket to an environmental surface. The beacon may be audible or visible or both, and may be arranged for constant or intermittent operation. A battery carried by the bracket powers the beacon. Optionally, beacon operation is switched to conserve battery power. Both manual and automatic switches may be included. Automatic switches, if provided, operate the beacon subject to a specified condition, such as detection of motion, thereby assuring likelihood of human presence, and detection of placement of a fire extinguisher within the bracket. Switches may be arranged for selective manual and automatic operation of the beacon.

Abstract: A relocatable sprinkler assemblage includes a flexible conduit connecting to a source of fire-suppression fluid, a heat-sensitive sprinkler head, a rigid fitting connecting the conduit to the sprinkler head, and a removable cap that, together with the fitting, creates a watertight compartment around the sprinkler head so that the assemblage can be moved while the sprinkler system remains pressurized and operational. The cap includes alerts the user to the condition of the sprinkler head, whether or not the head has been activated during the relocation process. In one embodiment, the cap is transparent, so that the condition can be determined by looking for fluid inside the cap. In another embodiment, the cap has a valve that can be operated manually to determine if there is fluid in the cap. In a third embodiment, the cap has a flexible bag that appears rigid if there is pressurized fluid in it.

Abstract: A spark and flame suppression system including an extinguishing member positioned around a contained fire extinguishing material and is securable within an engine compartment of a vehicle.

Abstract: Base for a fire-fighting tool is adapted to be secured to a horizontal surface such as the deck of a ship next to a vertical surface such as a bulkhead of such ship. The base is disposable at an angle that will allow the tip of a penetrator of a nozzle section of the fire-fighting tool, upon activation of an extensible hydraulic ram attached to the nozzle section, to be forced into the bulkhead and ultimately through the bulkhead, after which water may be sprayed into the area behind the bulkhead where a fire may be burning via spray orifices in the nozzle section. The arrangement of the fire-fighting tool at an angle between the deck and the bulkhead assures that there will be a rigid surface available for enabling pressure of the hydraulic ram to be exerted forcefully enough on the end of the penetrator section to breach the wall or bulkhead. The penetrator will dig into the wall surface efficiently and effectively even though it is applied to such wall surface at an angle.

Abstract: A dispenser reel assembly for automatically dispensing a fire extinguisher upon activation. This dispenser reel assembly is typically supported from an overhead support well above the floor, thereby protecting the fire extinguisher from damage and/or theft. To operate the assembly, a release plate covering a lower opening of a supporting frame is removed, thereby permitting the cable, and hence the suspended fire extinguisher, to be dispensed from the reel assembly via gravity. Typically, the fire extinguisher will come to rest about eight (8') feet above the floor so as not to inadvertently cause injury or damage. To lower the extinguisher further, a short retrieve rope is used to pull the extinguisher downwardly so that the extinguisher can either be used or removed from the dispenser reel assembly for use and/or inspection.

Abstract: Methods, circuits, and kits for converting battery powered smoke detectors to AC power include a power converter which converts standard household AC voltage to a DC voltage suitable for use by a battery powered smoke detector and a battery clip connector for connecting the power converter to the battery clips of a battery powered smoke detector. According to one embodiment of the invention, a light emitting diode is coupled to the battery clip connector to indicate the presence or absence of DC voltage at the smoke detector. According to another embodiment of the invention, several battery powered smoke detectors are coupled to a single power converter. In yet another embodiment of the invention, several battery powered smoke detectors are provided with an AC power supply having an automatic battery back-up power supply. Preferred aspects of the invention include: providing the battery backed-up AC power supply with a battery tester and providing fuses for each smoke detector and for the battery.

Abstract: A cabinet structure for a fire extinguisher has a glass door mounted in a frame. The glass is tempered glass, which shatters easily into small pieces upon cracking a portion thereof. A steel breaking lever is attached to an edge of the glass. When the breaking lever is rotated, it causes the glass to shatter into small, harmless pieces as a result of the inherent nature of built-in stresses in tempered glass, thus allowing access to the interior of the cabinet.

Abstract: A simple and inexpensive, but highly effective, single-walled fire-rated enclosure for a fire extinguisher cabinet which maintains the integrity of 1- and 2-hour fire-rated walls. The enclosure requires only five panels of fire-rated material which are firmly secured in place around the cabinet by a single pair of identically constructed metal mounting brackets which are oppositely secured to opposed walls of the fire extinguisher cabinet. Each bracket is generally planar, but has peripheral portions formed into a pair of oppositely facing channels offset from its outwardly facing surface, a flange extending from the bottom of each channel and away from the inwardly facing surface of the bracket, and a retaining element at one of its sides which also extends away from said inwardly facing surface. Each of the above elements is integrally formed with the more central portions of the bracket.

Abstract: A sprinkler head comprises a tubular body having a first threaded end to be connected to a water line and having a second end that defines an outlet enclosed by a cap. A thermally responsive element, such as a glass bulb or heat fusible element, is engaged with the cap to maintain the cap in a closed position. The body is provided with a pair of generally parallel circumferential grooves. The bottom of one of the grooves adjacent the threaded end has a polygonal cross section to receive a wrench to enable the sprinkler head to be threadedly attached to a water line, while the other of the grooves receives the base portion of a wire-form protective guard that encloses the thermally responsive element.

Abstract: A modular fire extinguishing apparatus for an enclosed environment includes a housing adapted for attachment to a support structure, a canister storing a pressurized gaseous substance such as carbon dioxide for the extinguishment of fires and being mounted to the housing, a conduit connected at one end to the canister for piping the pressurized gaseous substance away therefrom, a nozzle for receiving and dispersing the pressurized gaseous substance, a coupler for connecting a second end of the conduit to the nozzle, and a heat sensor for detecting a preselected temperature in the enclosed environment and in response to such detection causing the release of the pressurized gaseous substance through the nozzle and dispersal thereof over the vicinity of the enclosed environment to extinguish a fire.

Abstract: A safety ring for an end of a fire extinguisher is characterized by an underlying portion adjacent the lowermost end of the extinguisher. Flange portions extend upwardly from the underlying portion about the lowermost end of the extinguisher, to protect same and to enhance the retention of the ring on said extinguisher. The ring has a preferably U-shaped cross-section, and alternatively or additionally may be retained in operative protective relationship with the extinguisher by an adhesive substance or the like. Sloping upper edges of the flange portions provide desirable benefits, including reducing the risk of inadvertent dislodgment of the ring from the extinguisher and reducing the collection of water, dirt and the like on the edge of the flange. One or more holes may be provided in the ring to permit drainage of fluids and to permit easier cleaning of the ring. Hose-retaining means may be integrally provided with the ring.

Abstract: A relocatable sprinkler assemblage can be safely relocated while pressurized and operational and does not effect the temperature sensitivity of the sprinkler head.

Abstract: A fire-fighting apparatus for use in the home or a small office employing an enclosure or cabinet designed to fit in a wall and between the studs thereof, into which a water supply line is attached to a control valve, attached in turn to a coiled lay-flat garden-type hose. The coil of hose is held to the rear of the cabinet by compression against the interior walls of the cabinet and has an adjustable spray nozzle attached to the free end thereof. One or more chemical fire extinguishers may also be housed in the cabinet.

Abstract: A dry (unpressurized) hydrant utilizes a hydrant pipe wherein a submerged end carrying a strainer assembly is placed at a predetermined depth within a body of water, such as a lake or a pond, with the unsubmerged end being located above ground adjacent the water surface. A check valve installed behind the underwater strainer allows the pipe to be filled with water delivered from a tank onboard a pumper truck. Flooding the pipe in this manner allows the pumper truck to then pump water from the lake or pond, through the hydrant, with little or no priming necessary so as to meet fire suppression demands. A vent valve located on the pumper intake connected to the unsubmerged end allows air to escape from the pipe during the filling process.

Abstract: A sprinkler system, for cooperation with an array of ceiling tiles, essentially features a mount of tiles including at least one with a central opening, a web disposed above the mount of tiles and including a central hub and legs extending therefrom to the corners of a frame with a dimensional profile like that of the tiles, a number of ceiling wires supporting the frame in spaced relation to a ceiling, a sprinkler head supported within the central hub and extending through the central opening, and apparatus for connecting the sprinkler head to a source of fluid. Preferably, the apparatus includes a rigid stationary water grid and supply and a flexible hose connecting the sprinkler head to the water grid and supply. Preferably, the flexible hose is an annealed stainless steel braid hose having an open pitch.

Abstract: A fail-safe phial-type fire extinguishing system is intended to be activated when the environment in which at least a first part of the system (namely, a detector or sensor) is situated reaches a first predetermined condition, and is activated as a fail-safe measure when the environment in which at least a second part of the system (namely, the phial) is situated reaches a second predetermined condition, the system including a fire extinguisher, a detector or sensor, and an extinguisher activator including a heater.

Abstract: A door includes an apparatus for reducing smoke associated therewith. The door is particularly advantageous in reducing smoke in a fire to thereby allow a firefighter or a victim trapped in a fire to readily indentify an exit. The door includes a nozzle or plurality of nozzles mounted upon the door, with a liquid source connected to the nozzle. Preferably, the door additionally includes a supply of pressurized water therein, with a surface active agent in an amount of 0.

Abstract: The present invention comprises a quick release tank support bracket having a positive locking engagement along with an optional operative seat back supportive assembly which includes support bars mounted with a frame with clamp arms secured to the support bars. At least two such support bars are included with at least one or more clamp arms secured thereto. The clamp arms are movable between a closed position for retaining of a tank therein and an opened position for releasing of the tank therefrom. Each of the support bars includes a crank arm which is interconnected by an inner engagement device for controlling cooperative relative movement of the two clamp arms with respect to one another. Closure lugs are positioned integral with the clamping arms and extend inwardly and include tank engaging surfaces such that when the tank is inserted into place by pushing horizontally toward the backing plate, the clamping arms and the support rods will automatically move to the tank retaining position.

Abstract: An indoor fire hydrant apparatus includes a fire hose having electrical conductors extending along its length and connected to a switch mounted near the nozzle end of the hose. Closure of the switch causes energization of a solenoid-actuated valve which is connected between a source of water under pressure and the hose. Closure of the switch also causes energization of a pump to build up the water pressure. A single person may pull the hose from a rack, extend it toward a fire, and actuate the switch thereby causing water under pressure to be dispersed through the nozzle. The electrical conductors may be embedded in a wall of the fire hose or mounted on an exterior surface of the hose. The hose may be of the folding type or the type which maintains its generally circular shape.

Abstract: A dry (unpressurized) hydrant utilizes a hydrant pipe formed from PVC. One end engages a sliding swivel mount attached to a post with the other end of the pipe being free to swing and to be placed within a nearby body of water. The free end may include a strainer assembly, also formed of a PVC material. The strainer end may be placed at a predetermined depth within a body of water, such as a lake, pond or the like, by means of a second support located proximate the body of water. Alternatively, the strainer end of the hydrant pipe may be provided with a buoyant float to maintain the level of the strainer end of the hydrant pipe just below the water surface. In another embodiment, the strainer end of the hydrant pipe is provided with a rotating wheel assembly which enables the strainer end of the hydrant pipe to be rolled into position beneath the surface of the body of water. The dry hydrant is formed from inexpensive and lightweight materials and can be stored dry when not in use.

Abstract: A fire or explosion suppression system provided with a source of pressurized suppressant and an apertured release suppressant nozzle which extends into the area protected by the system is provided with a cover unit which prevents the nozzle from becoming clogged or impeded by solid materials present in the protected zone. The cover unit that envelops the nozzle is of elastomeric material and has four internal grooves defining lines of weakness which present a cross-pattern. Upon release of the suppressant, the cover unit ruptures along the lines of weakness whereby the petal-shaped areas of the unit defined by the grooves open up for free flow of suppressant therepast.

Abstract: A cabinet structure is described for enclosing a fire extinguisher or the like. The cabinet structure comprises a housing having a permanently hinged access panel which pivots away from the housing to permit access to its contents. The access panel is secured to the housing when in a closed position by one or more shear members of sufficient frangibility that, in response to the application of a predetermined force to a handle on the access panel, the shear members are severed, permiting the access panel to be pivoted to an open position.

Abstract: A container for a fire extinguisher is of a lazy susan type including an inner housing and an outer housing on which the inner housing is rotatable about a vertical axis. The outer housing includes an octagonal top with a depending surrounding flange. The inner housing includes two side flanges which project outwardly to engage cooperating flanges on the outer housing for providing a vertical lip seal along the sides of the inner housing. The top and bottom panels of the inner housing are spaced from the top and bottom panels of the outer housing to allow an air flow through this area to maintain the housing free from condensation of the moisture.

Abstract: The method and apparatus of this invention provides a cannon-like device for projecting a sheath of fire extinguishing particles rapidly upwardly along a flaming oil and/or gas stream gushing up from an oil and/or gas well. The sheath instantaneously insulates the oil and/or gas in the stream from the surrounding atmosphere to freeze the flame at the tip of the sheath and shield the stream within the sheath from contact with the flaming oil and/or gas above and around the stream of oil and/or gas enclosed within the sheath until all of the already flaming oil and/or gas has been burned out. The method for eliminating the flames above the outlet of an oil well is accomplished by separating the oil and/or gas stream flowing from the oil and/or gas well from the flames by producing a sheath of fire extinguishing material, driven by an explosive charge into a position to surround and separate the oil and/or gas stream from the flames.

Abstract: A mounting plate secures a fire extinguisher canister within a releasable securement strap, wherein the securement strap further includes a flashlight member released upon releasing of the fire extinguisher canister. An audible alarm is cooperative with a flashing light to direct a visual and audible signal in association with a smoke detector circuitry of a dwelling.

Abstract: A self contained smoke actuated fire extinguishing flooding system is comprised of: a dual battery powered source, a smoke detecting device, a spring load plunger actuated valve, audio alarm, and a built-in test system which utilizes a blended halogenated fire extinguishing agent that is intended for use in enclosures for electronic, electrical, and others.

Abstract: A fire extinguisher cabinet includes a generally rectangular compartment closed by a hinged door. The door includes a front panel having a depending skirt. A gasket straddles the edge of the compartment periphery and seals against the door when the door is closed. Toggle type latches secure the door in place and compress the gasket to seal against the front door panel and against the skirt.

Abstract: A pendent style sprinkler includes a sprinkler body portion and a plug valve assembly having a sleeve secured to a deflector plate on an outlet side of the sprinkler body portion. A clip is wedged between the sprinkler body portion and the deflector plate. The clip includes a peripheral edge or tab portion projecting radially outwardly beyond a peripheral portion of the sprinkler body portion and a peripheral portion of the deflector plate. A ceiling cover is provided having a central portion adapted to contact the clip peripheral edge portion such that the cover is suspended at the central portion on the peripheral edge portion of the clip.

Abstract: An escutcheon plate assembly that provides partial support for flexible sprinkler piping systems and the anchoring of sprinkler heads in ceiling and wall. The plate assembly also provides proper alignment to the attachment surfaces.

Abstract: A fire extinguishing system for a cookstove or range includes a fire extiisher mounted above a hood positioned over the cookstove or range. The fire extinguisher is connected to a pair of nozzles within the hood to dispense fire suppressant over the cookstove or range. The fire extinguisher includes an operator normally biased to the operable position, but held in the inoperable position by a cable having a plurality of fusible links distributed therein. The cable is held in tension adjacent the inner periphery of the hood. Upon the occurrence of a fire, at least one of the links separates, releasing the cable and allowing the operator to move to the operating position whereby the fire extinguisher releases the fire suppressant. A low-voltage control circuit is used to cut off the flow of electricity or gas to the stove and to sound an alarm. A battery is provided with the low-voltage control circuit so that the system will still operate if house current is interrupted.

Abstract: Cabinet assembly for simple placing in a room so that in the event of a fire it detects fire and discharges compressed fire-fighting vapor such as bromotrifluoromethane. Cabinet contains tank of compressed vapor with discharge conduit and controls so that mere connection to electric power supply will place it in operation. Second tank in cabinet can be arranged to discharge such vapor through opening in raised floor to fight fire in space below the raised floor.

Abstract: A wall mounted plate for a hand-operated fire extinguisher in which the plate has markings thereon to signal to the prospective user its location. The plate is composed of a fiberglass reinforced plastic, the markings thereon being of a striped pattern and integral with the plastic, and the plate further having a planar extension beyond the periphery of the fire extinguisher for effecting maximum visibility.

Abstract: A sprinkler head is adjustably supported in three dimensions by an assembly including a first bracket having a cut-out and a second bracket having a cut-out. The first bracket has a circumferentially evenly spaced array of three threaded apertures around the cut-out. The second bracket has a similar set of unthreaded holes around its cut-out. Bolts extend through the second bracket and are threaded into the apertures of the first bracket. Nuts on the bolts may be used as stop elements. The second bracket is attached to fingers extending from the downcomer pipe to which the sprinkler head is attached. In a second embodiment, three fingers are provided, and they replace the second bracket. Adjustment of the sprinkler head about two orthogonal axes and along a third orthogonal axis parallel to the downcomer pipe can be achieved by turning the bolts from beneath the false ceiling through which the sprinkler head extends.

Abstract: A device having a first tank which is equipped with a telescopic vertical column which is contained in the folded state in the tank which contains a liquid and which bears a diffuser. The device includes a second reserve tank and further includes flame detectors distributed on the periphery of the tanks. When a flame is detected, an electronic central unit automatically controls pyrotechnical obturators which place bottles of compressed gas in communication with the first tank.

Abstract: A cabinet structure for storing a fire extinguisher including an open front box-shaped housing and a cover mountable thereon. Mating recesses in the top wall of the housing and hinge tabs in the top side of the cover cooperate to provide pivotal engagement between the cover and housing and mating flange members on the housing and cover facilitate padlocking of the cover in mounted disposition on the housing. The hinge tabs are breakable in response to the application of a pulling force on a grip formed in the top side of the cover to facilitate emergency access to the cabinet. A peripheral lip and interior tabs on the cover facilitate proper centering of the cover on the housing.

Abstract: Recessed sprinkler apparatus including a cover plate having a melting temperature substantially lower than the release temperature of the sprinkler head.

Abstract: A retaining device for hand-held fire extinguishers is provided with retaining means (12) co-operable with linking means (18), in the form of a dislodgable or frangible panel, and locking means (28). In normal use, article (10) is removed by unlocking the means (28). In emergency, the article is accessed via (18).

Abstract: A support for an air tank of the type used in breathing apparatus has an improved means for releasably gripping the tank. It uses, for this purpose, crank elements rotatable with parallel bars to which are secured arms that clamp the tank between them. The crank elements overlap in a space between the bars, and their overlapping areas are slidably and pivotally interengaged. Swinging movement of one of the elements produces corresponding swinging movement of the other to rotate the bars between opposite extreme positions in one of which the clamp arms grip, and in the other release, the tank or cylinder. A user releases the cylinder by throw of a conveniently disposed handle. The handle rotates a cam in contact with a cam follower in the form of an angular arm rigid with one of the crank elements, to translate rotation of the cam through approximately 90.degree. into a swinging movement of the articulated linkage defined by the crank elements, over a dead center.

Abstract: A hose nozzle for a fire fighting kit is provided to utilize the availability of water from a sink faucet to extinguish fires in the home prior to the time fire fighters arrive. An adapter is threaded onto the sink faucet without interrupting the normal use of the faucet. The quick-attach fire fighting kit is stored nearby. The fire hose body can be quickly connected to the adapter by use of a quick connect coupler attached to one end of the hose. The opposite end of the hose body has a nozzle which can be adjusted to control the spray of water therefrom by means of a slidable valve assembly.

Abstract: A decorative housing for a fire extinguisher. A five sided box forms a cavity to receive and hold a fire extinguisher. A door or decorative cover is slidably mounted to the box adjacent the cavity and is movable from an up position closing the cavity and concealing the fire extinguisher to a down position revealing the fire extinguisher. A heat and smoke detector mounted to a clock frame above the box is connected to a source of electrical energy and in turn to a solenoid. The plunger of the solenoid normally extends into the door locking the door in the closed position. Activation of the detector withdraws the plunger allowing the door to slide downwardly. An audio alarm and light within the box cavity activate simultaneously upon the withdrawal of the plunger. A cord is connected to the plunger to allow manual withdrawal of the plunger and opening of the door.

Abstract: An explosion suppression system disposed externally of a structure that encloses a protected zone. The system includes a source of pressurized explosion suppressant, a pressure detector, a release mechanism for releasing the suppressant through a discharge port opening into the protected zone in response to detection of a pressure wave by the detector, and tubulation providing fluid communication between the detector and the protected zone. An inclined portion of the tubulation terminates with an intake port and comprises both vertical and horizontal components of substantial magnitude.