Abstract: A fire exposure protection sprinkler assembly includes a fluid supply line configured to provide fire exposure protection fluid and a fire exposure protection sprinkler. The fire exposure protection sprinkler includes a body coupled to the fluid supply line and configured to receive the fire exposure protection fluid, a sealing assembly configured to unseal in response to a fire such that fire exposure protection fluid may flow, a housing having a pair of legs arranged opposite the housing of each other and having an aperture, and a deflection assembly having a pair of guide pins coupled to a deflector and the housing and disposed within each of the apertures of the legs, wherein the deflection assembly is configured to extend from the housing, wherein the deflection assembly is configured to receive the flow of the fire exposure protection fluid while extending from the housing.

Abstract: Disclosed is a fire suppressant system for a cargo container, the system having: a pressure vessel disposed within the cargo container, an exterior surface of the pressure vessel defining a fire suppressant-opening; a seal member that covers the fire suppressant-opening; and a connection feature connects the seal member to the pressure vessel, wherein the connection feature that releases the seal member when exposed to a predetermined minimum temperature.

Abstract: Installation and protective devices for fire protection sprinkler assembly having a support cup is disposed about the sprinkler assembly. A protective cap engages the support cup to define an internal volume to enclose the sprinkler therein and protect operational components of the sprinkler during storage, transport, installation and when awaiting to be placed into service. The protective cap defines a tool path with slots of the protective cap in fluid communication with the internal volume. The protective cap and tools are configured to cooperate with one another to permit the tool to adjustably navigate within the internal volume to access the protected sprinkler for installation or adjustment of the sprinkler frame and/or for removing the protective cap.

Abstract: A sprinkler assembly that includes a deflector assembly that translates with respect to the sprinkler frame upon actuation of the sprinkler from an unactuated state. The sprinkler frame includes a support member having an annular member spaced from the outlet to limit or control the axial translation of the deflector assembly relative to the outlet. Moreover, the annular member includes a region to support a closure assembly and thermally responsive trigger assembly under a fluid static load. A cover plate assembly includes a flexible annular wall to allow the cover plate assembly to be pushed on and held about the annular member of the sprinkler frame.

Abstract: A sprinkler head includes a main body having, thereinside, a nozzle connected to a water supply pipe, a deflector having a disk shape with a plurality of slits in an edge portion, where the deflector is disposed so as to intersect with a central axis of the nozzle, and a support member configured to connect the main body to the deflector. A circular arc shaped first convex portion is formed in a direction from the center of the deflector to a position obtained by rotating the position of the support member by 90 degrees around the center, circular arc shaped first slits are disposed on either side of the convex portion, and the shape of a portion from one of the first slits to the other via the first convex portion is corrugated.

Abstract: A sprinkler head includes a main body, a valve element, a heat-sensitive disassembling unit, a cylindrical frame, a set pin between the valve element and the disassembling unit, and a spring member engaged with the pin. The body includes a nozzle from which fire-extinguishing liquid is discharged. The disassembling unit includes a plunger having an interior circumferential surface. The disassembling unit keeps the nozzle closed with the valve element and opens the nozzle through a breakdown action during activation. The frame includes an upper part connected to the body and a lower part engaged with the disassembling unit. The pin includes a leg inserted in the plunger and including an inclined surface and a straight portion closer to the valve element. The straight portion is in contact with and slidable over the circumferential surface. The breakdown action causes the pin to move, with the inclined surface contacting the circumferential surface.

Abstract: A sprinkler includes a body defining (a) a passage having an inlet and extending along a longitudinal axis and (b) an outlet fluidly coupled to the passage. The sprinkler includes a seal engaging a button and the body to fluidly seal the inlet from the outlet. A link and lever assembly includes a first lever and a second lever engaging the button. The first lever and the second lever each include (a) a leg positioned near a base end of the lever and extending outward from the longitudinal axis, the leg defining an engagement surface, (b) a head positioned near a tip end of the lever, and (c) a main body extending from the leg to the head. A fusible link limits movement of the heads. The engagement surfaces each engage a surface of the body to limit movement of the button along the longitudinal axis.

Abstract: A cover plate for a concealed sprinkler includes a member having at least one passageway section enabling heated air to pass between the cover plate and the sprinkler housing and towards the sprinkler head to permit the timely activation of the sprinkler head. The passageway section is defined by an outwardly extending peripheral rim of the cover plate or by a cutout section along one edge enabling air to pass therethrough. The cover plate includes a plurality of mounting tabs upon which a fusible material is applied to adhere the cover plate to the housing of the sprinkler head. The cover plate increases the response time of the concealed sprinkler head while maintaining a low profile, discrete appearance.

Abstract: A firefighting medium is allowed to escape from a nozzle through apertures, the nozzle being provided with an internally arranged valve in sealing contact with a valve seat until the valve is released from its sealing position. The release is caused by a heat sensible release mechanism acting on the valve, whereby the sealing effect of the valve is relieved. A locking force required for maintaining the sealing effect by a removable cap or cover is provided, attached to the nozzle front, the locking force being established between at least two interacting surfaces. By releasing the sealing effect of the valve by removing the locking effect between the two interacting surfaces, the cap or cover is allowed to drop off its seat on the nozzle, relieving the press causing the sealing effect on the valve of the nozzle, the removal of the cap or cover caused by releasing mechanism.

Abstract: A radiation-activated sprinkler includes a sprinkler body defining a main orifice, the main orifice adapted to couple to a source of pressurized liquid; a deflector coupled to the body; a valve adapted to seat on the main orifice to block the source of pressurized liquid; a linkage mechanism adapted to retain the valve on the main orifice; and one or more fusible links coupled to the linkage mechanism, wherein the one or more fusible links are located substantially externally with respect to the sprinkler body, deflector, and linkage mechanism. The one or more fusible links are adapted to release when exposed to an amount of radiation that exceeds a predetermined threshold, thereby releasing the linkage mechanism from the valve. Other features and related methods are also described.

Abstract: A sprinkler head 1 includes a head body 10 having a water discharging cylinder 16 in the interior thereof, a frame 20 connected to the head body 10, a valve body 30 provided in the interior of the frame 20 and closing a water discharging port 12 of the water discharging cylinder 16, a thermosensitive portion 51 configured to support the valve body 30, and a disk spring 64 provided between the valve body 30 and the thermosensitive portion 51. A set screw 65 to be coupled to the thermosensitive portion 51 is provided under the valve body 30, and the set screw 65 is inserted into a through hole 64a at the center of the disk spring 64. The set screw 65 includes a head portion and a leg portion, and the head portion is formed to be higher than the height of the disk spring 64.

Abstract: A horizontal sidewall fire protection sprinkler has a deflector having a vertical face, transverse to the fluid flow from the output orifice, and a horizontal shelf positioned above and perpendicular to the vertical face. A portion of the horizontal shelf extends in the fluid flow direction by a first length, with respect to the vertical face, and this first length is less than about half of the total length of the horizontal shelf in the fluid flow direction. The sprinkler may be installed in a support cup having a raised mounting platform configured to receive the sprinkler body and a cylindrical outer surface. A horizontal or pendent fire protection sprinkler has a body having an output orifice and a flange and a seal cap to seal a flow of fluid from the output orifice and a thermally-responsive element positioned to releasably retain the seal cap. Housing members extend through and from the flange of the sprinkler body, and contain rods, each of which extends through the flange.

Abstract: A device is provided for triggering a fire extinguishing system by a sprinkler, the device being arranged between the pipe for the extinguishing agent and the sprinkler and including a multiple-armed toggle-lever joint acting between a load axis of the triggering element and a sealing element that is arranged at an angle of 80 to 120° thereto. The device has the advantage that dry pipe sprinklers whose glass bulbs can only absorb low mechanical forces can also be arranged for use with pipes that exhibit large entry cross-sections, large volume flows and high pressures as the forces from the pipe that arise have to be absorbed only in part by the sprinkler glass bulb. It is further advantageous that the sealing force of the sealing element can be adjusted by means of an actuator.

Abstract: A concealed sprinkler including a body having a proximal portion and a distal portion. The distal portion includes an annular wall defining a chamber and an opening in communication with the chamber. A deflector assembly is disposed within the chamber. A trigger assembly having a lever assembly engaged with an inner surface of the annular wall supports the deflector assembly in the first position, the trigger assembly including and a thermally rated plate assembly having a lip portion to substantially circumscribe and substantially cover opening and chamber.

Abstract: Disclosed is an intelligent, autonomously usable closure for misting nozzles, atomizing nozzles and sprinklers. A covering plate 20 is fixed on the closure having a heat tripping device, a nozzle body 2, outlet channel 11 and outlet opening 10 by means of a melt tripping device 5. The melt tripping device 5 is activated when necessary by a heat element 23 and the outlet opening 10 is released. A structural element 21, such as a disk spring, ensures at the melting moment of the melt tripping device 5 that a force F is applied and the covering plate 20 is separated with force from the outlet opening. In case of emergency, the release is triggered without energy. The proposed autonomous device can be used in a system network and can also be integrated into an existing system.

Abstract: A temperature-activated valve for a conventional fire sprinkler utilizing a hyperelastic single-crystal shape memory alloy is described. The shape-memory element expands as it is heated, forcing a bolt to break, thereby opening the sprinkler valve. The shape memory element typically communicates with the valve so as to force it open. The devices described are less susceptible to accidental breakage than conventional actuators, and have fewer moving parts. Transition temperature of the shape memory alloy can be tuned to a narrow range.

Abstract: A sprinkler mounting strut that secures an unrestrained pipe and a sprinkler together to engage a wall through which the sprinkler extends. The strut provides prongs and engagement portions that secure the strut to the edges of a hole extending through the wall. The strut provides a base against which a pipe abuts to secure the pipe to the wall. The sprinkler extends through an escutcheon and through the base of the strut to engage the pipe and draw the pipe and escutcheon towards each to secure the components to the surfaces of the wall.

Abstract: A pendant sprinkler preferably includes a body having an inner surface defining a passageway. The passageway includes an inlet and an outlet spaced apart along the longitudinal axis and defines a K-factor of about 5. The sprinkler also includes a closure assembly adjacent the outlet to occlude the outlet and a thermally responsive support means for maintaining the closure assembly adjacent the outlet. Also provided are means for distributing a flow of fluid over a protection area ranging from about 144 square feet to about 400 square feet, the fluid distribution having a density of at least 0.05 gallons per minute per square foot (0.05 gpm/ft2) so as to define a range of minimum operating pressures ranging from about seven pounds per square inch to about seventeen pounds per square inch (7-17 psi.) and a range of minimum operating fluid flows ranging from about thirteen gallons per minute to about twenty gallons per minute (13-20 gpm.).

Abstract: A device is provided for triggering a fire extinguishing system by a sprinkler, the device being arranged between the pipe for the extinguishing agent and the sprinkler and including a multiple-armed toggle-lever joint acting between a load axis of the triggering element and a sealing element that is arranged at an angle of 80 to 120° thereto. The device has the advantage that dry pipe sprinklers whose glass bulbs can only absorb low mechanical forces can also be arranged for use at pipes that exhibit large entry cross-sections, large volume flows and high pressures as the forces from the pipe that arise have to be absorbed only in part by the sprinkler glass bulb. It is further advantageous that the sealing force of the sealing element can be adjusted by means of an actuator.

Abstract: A concealed-type sprinkler that includes a body having a proximal portion defining an opening and a distal portion defining an outlet. The body defines an internal passageway having an inlet and an outlet spaced apart along a longitudinal axis. The distal portion preferably includes an annular wall having an outer surface and an inner surface to further define a chamber distal of the outlet to house an internal component of the sprinkler. A cover plate assembly substantially conceals the chamber and includes a thermally responsive surface in communication with the chamber to actuate the sprinkler. The preferred sprinkler preferably includes a spacing member disposed between the annular wall and the cover plate assembly to define at least one aperture for communication between the chamber and the environment external to the sprinkler. An escutcheon is preferably disposed about the annular wall.

Abstract: A sprinkler of the compressed strut and lever type wherein the motion of the lever is limited is disclosed. The sprinkler includes a compression member that compresses a strut against a sealing member that closes the outlet of the sprinkler. One end of a lever is positioned between the compression member and the strut. The opposite end is positioned in proximity to an abutment surface on the sprinkler. The opposite end is engageable with the abutment surface which limits motion of the lever and maintains an offset between the strut and the compression member that renders the strut and lever an unstable mechanism. A frangible link extends between the strut and the lever. The link separates in response to an increase in temperature indicative of a fire condition.

Abstract: A fire protection sprinkler is provided, including a body having an output orifice and a flange and a seal cap to seal a flow of fluid from the output orifice. A thermally-responsive element is positioned to releasably retain the seal cap. Housing members extend through and from the flange of the sprinkler body, and contain rods, each of which extends through the flange. A deflector is connected to ends of the rods.

Abstract: A horizontal sidewall fire protection sprinkler is provided, including a deflector having a vertical face, transverse to the fluid flow from the output orifice, and a horizontal shelf positioned above and perpendicular to the vertical face. A portion of the horizontal shelf extends in the fluid flow direction by a first length, with respect to the vertical face, and this first length is less than about half of a total length of the horizontal shelf in the fluid flow direction. The sprinkler is installed in a support cup having a raised mounting platform configured to receive the sprinkler body and a cylindrical outer surface, with a front edge in a fluid flow direction, and a back edge. The mounting platform of the support cup is closer to the front edge of the support cup in an axial direction thereof than to the back edge.

Abstract: A spring-loaded device conceals a recessed sprinkler head. Heat releases the spring and exposes the sprinkler head.

Abstract: A fast response, upright sprinkler head includes a body having a central orifice through which fire extinguishing fluid is expelled through an outlet end. A yoke, attached to the exterior surface of the sprinkler body, extends beyond the outlet end of the sprinkler body and is connected at its apex to a deflector. A fusible trigger assembly is coupled to the yoke and the outlet end of the sprinkler head. The deflector is formed with a planar member having a skirt depending therefrom and an annular ledge extending horizontally from the skirt. The skirt depends from the planar member in an outward direction at a pre-selected angle from the vertical, and is formed with a plurality of through-holes. The fast response upright sprinkler head is configured to have a K value of at least 13.5, while the fusible trigger assembly has a fusing temperature between approximately 155° F. and 175° F.

Abstract: A fire protection sprinkler is provided, including a body having an output orifice and a flange and a seal cap to seal a flow of fluid from the output orifice. A thermally-responsive element is positioned to releasably retain the seal cap. Housing members extend through and from the flange of the sprinkler body, and contain rods, each of which extends through the flange. A deflector is connected to ends of the rods.

Abstract: A sprinkler head comprises: a locking unit locked inside a second housing for maintaining a sealing state between a deflector and a first housing; a heat responding unit exposed to outside of a ceiling for releasing the locked state of the locking unit by reacting to fire when fire breaks out; and a head cover mounted at a lower side of the heat responding unit and transmitting heat to the heat responding unit after collecting heat at the time of a fire occurrence. According to this, a fine appearance of the sprinkler head is provided, and the head cover performs a heat collecting function at the time of a fire occurrence thus to have a fast reaction speed, thereby enhancing a function of the sprinkler head.

Abstract: The present invention provides apparatus and methods for pro-active, intelligent fire suppression and/or control using a micro-controller that is communicatably connected to at least one fire-energy detection sensor and to at least one fire suppression device. The present invention provides apparatus and methods for sensing the exact direction of a fire as well as a regional location of a fire. The present invention provides apparatus and methods for directing a fire suppressant at the source of the flame. As depicted in FIG. 1a, the present invention provides fine protection apparatus (10) for identifying the existence of a fire hazard and for determining the exact direction and regional location of the file hazard by using multiple infrared (IR) detectors. A first IR detector (20) with a wide angle view of an area of coverage corresponding to an area requiring fire protection will be continuously queried by a micro-controller (100).

Abstract: A low pressure, extended coverage, fire protection sprinkler, e.g., of the upright type, suitable for use in protection of at least extra hazard and high piled storage occupancies, in accordance with the 1999 Edition of NFPA 13, has a body with an internal passageway extending between an inlet end and an opposite outlet end, and a deflector mounted to the body by at least one support arm and disposed in alignment with the axis and generally spaced from the outlet end of the internal passageway. The sprinkler has a predetermined K-factor, e.g., of greater than about 16.0. The sprinkler is configured and arranged to deflect flow of water generally radially outwardly and downwardly of the sprinkler in a predetermined spray pattern. Preferably, the predetermined spray pattern has a generally polygonal shape, e.g., a rectangular shape, when viewed at a predetermined distance below the deflector.

Abstract: A pendant sprinkler head includes a sprinkler body formed with a central orifice, and a sealing member positioned within the orifice and in sealing engagement with the inlet. A deflector assembly is at least partially positioned within the orifice and includes an annular ring having a pair of attachment arms secured to a deflector plate positioned in proximity to, or partially within the outlet. A retaining ring positioned within the orifice acts as a stop, preventing the annular ring from being expelled from the orifice. According to another aspect of the invention, a pendent sprinkler head includes a sprinkler body and a body extension connected to the body. A deflector plate is formed with a plurality of support members received by a retaining ring positioned in proximity to the bottom of the sprinkler body, and within the body extension. The body extension is configured to capture the retaining ring upon activation, enabling the deflector plate to depend below the body extension.

Abstract: New and in-use fire sprinkler systems can be sterilized by employing antimicrobial gases. The gases include steam, oxygen, and chlorine. Water added to the system after sterilization can be sterilized to prevent the reoccurrence of microbiological contamination.

Abstract: The automatic fire extinguishing method using liquefied CO2 to regulate the distribution of fire extinguishing agents characterised in that this method uses liquid CO2 as: an independent fire extinguishing agent or combined with other fire extinguishing agents to create new fire extinguishing agents which have strong effects and high efficiency; as a dynamic source producing pressure in the tank to push fire extinguishing agents into the fire area, and as a dynamic source of the entire fire extinguishing system and automating the process.

Abstract: A low pressure, early suppression fast response sprinkler includes a generally tubular body having an inlet ends, an opposing discharge end and an internal passageway extending between the inlet and discharge ends with a K factor greater than 16 where the K factor equals the flow of water in gallons per minute through the internal passageway divided by the square root of the pressure of water fed into the tubular body in pounds per square inch gauge. A deflector is coupled with the tubular body and spaced from and generally aligned with the discharge end of the internal passageway so as to be impacted by a flow of water issuing in a column from the discharge end upon activation of the sprinkler. The deflector is configured and positioned to deflect the flow of water generally radially outwardly all around the sprinkler.

Abstract: A fast response, upright sprinkler head includes a body having a central orifice through which fire extinguishing fluid is expelled through an outlet end. A yoke, attached to the exterior surface of the sprinkler body, extends beyond the outlet end of the sprinkler body and is connected at its apex to a deflector. A fusible trigger assembly is coupled to the yoke and the outlet end of the sprinkler head. The deflector is formed with a planar member having a skirt depending therefrom and an annular ledge extending horizontally from the skirt. The skirt depends from the planar member in an outward direction at a pre-selected angle from the vertical, and is formed with a plurality of through-holes. The fast response upright sprinkler head is configured to have a K value of at least 13.5, while the fusible trigger assembly has a fusing temperature between approximately 155° F. and 175° F.

Abstract: A low pressures early suppression fast response sprinkler includes a generally tubular body having an inlet ends an opposing discharge end and an internal passageway extending between the inlet and discharge ends with a K factor greater than 16 where the K factor equals the flow of water in gallons per minute through the internal passageway divided by the square root of the pressure of water fed into the tubular body in pounds per square inch gauge. A deflector is coupled with the tubular body and spaced from and generally aligned with the discharge end of the internal passageway so as to be impacted by a flow of water issuing in a column from the discharge end upon activation of the sprinkler. The deflector is configured and positioned to deflect the flow of water generally radially outwardly all around the sprinkler.

Abstract: A low pressure, early suppression fast response sprinkler includes a generally tubular body having an inlet end, an opposing discharge end and an internal passageway extending between the inlet and discharge ends with a K factor greater than 16 where the K factor equals the flow of water in gallons per minute through the internal passageway divided by the square root of the pressure of water fed into the tubular body in pounds per square inch gauge. A deflector is coupled with the tubular body and spaced from and generally aligned with the discharge end of the internal passageway so as to be impacted by a flow of water issuing in a column from the discharge end upon activation of the sprinkler. The deflector is configured and positioned to deflect the flow of water generally radially outwardly all around the sprinkler.

Abstract: An upright-type fire protection spray mist nozzle has a base defining an orifice through which fire-retardant fluid can flow, an inlet section having an upstream end and defining a conduit for flow of fire-retardant fluid along a orifice axis and leading to an upstream end of the orifice, and a diffuser element defining an impingement surface that is at least substantially imperforate in an axial direction and positioned for impingement by a stream of fire-retardant fluid flowing from the orifice in a stream direction along the orifice axis, the diffuser element being positioned generally above a horizontal plane through a downstream end of the orifice.

Abstract: In the representative embodiments described in the specification, a concealed horizontal sidewall sprinkler has a sprinkler body adapted to be connected to a source of fire extinguishing liquid. A cover support is mounted substantially concentrically to the sprinkler body and has a threaded cylindrical wall extending away from the source of fire extinguishing liquid. The threaded cylindrical wall engages a sleeve which at one end has a slotted cylindrical portion with helically arranged projections to be received in the threads of the threaded cylindrical wall of the cover support. The other end of the sleeve has a flange with a plurality of tabs extending away from the cylindrical portion. A cover is attached by solder to the tabs extending from the flange of the sleeve. The cover also has four slots and is spaced from the flange of the sleeve by the tabs forming an annular gap.

Abstract: A low pressure fast response sprinkler includes a generally tubular body having an inlet end, an opposing discharge end and an internal passageway extending between the inlet and discharge ends with a K factor greater than 16 where the K factor equals the flow of water in gallons per minute through the internal passageway divided by the square root of the pressure of water fed into the tubular body in pounds per square inch gauge. A deflector is coupled with the tubular body and spaced from and generally aligned with the discharge end of the internal passageway so as to be impacted by a flow of water issuing in a column from the discharge end upon activation of the sprinkler. The deflector is configured and positioned to deflect the flow of water generally radially outwardly all around the sprinkler.

Abstract: A fire protection sprinkler has a body with an orifice and a coaxial outlet for delivery of fire protection fluid from a source; a cap that resists flow of fluid from the outlet in a sprinkler standby condition; and an actuator securing the cap in the standby condition and releasing the cap in an operating condition to permit flow of fluid from the outlet. The actuator includes a thermally sensitive release assembly with an elongated thermally sensitive element, e.g.

Abstract: Directional sprinklers include a sprinkler body with a water directing structure configured to direct water passing from an outlet of the sprinkler body in one or more distinct and different directions. Water directing structures are disclosed in the form of deflectors having one or two separate water directing channels and hollow heads having at least two separate nozzles facing in two distinct and different directions. The channels and nozzles can be configured to direct water in diametrically opposing directions, mutually perpendicular directions or at any other desired orientation with respect to one another and to direct the water radially outwardly from the centerline of the sprinkler body outlet or at any predetermined transverse angle to that centerline. The throw of each channel and nozzle is longer than it is wide so that water is discharged over a generally rectangular or elliptical area in each direction.

Abstract: A quick response frangible bulb sprinkler head includes a tubular body connected to a water line. The body has an outlet that is enclosed by a cap or closure, which is held in the closed position by a lever assembly. The lever assembly includes a pair of lever arms which are disposed in an X-configuration, with one end of each arm engaged with the body and the opposite ends of the lever arms are spaced apart and engaged with the opposite ends of an elongated glass bulb. The axis of the bulb is disposed normal to the axis of the outlet in the body. A screw is threaded in the closure and the tip is engaged with a channel-shaped pressure member that is connected to the central portions of the lever arms. Through adjustment of the screw, the compressive force on the bulb can be varied.

Abstract: A fork type ceiling sprinkler includes a sprinkler body and a fork coupled to an outlet end of the sprinkler body. The fork has a pair of arms extending away from an outlet end of the body. Free end portions of the arms define a gap aligned with an outlet of the sprinkler body. A plug is releasably retained in the outlet by a pair of levers extending from the plug to sloping surfaces provided by bosses on the inner sides of the two fork arms. A temperature-sensitive element between the levers prevents the levers from sliding off sloping arms until the sprinkler is activated. A stamped deflector plate is supported on pins slidably mounted through the fork arms. A cup is adjustably mounted through bracket arms to the sprinkler on the outside of the fork arms that support the deflector.

Abstract: An improved concealed sprinkler head assembly that incorporates a standard pendant-type sprinkler head includes a frame having an outlet that is connected to a water line and a valve cap that encloses the outlet and is held in the closed position by a releasable lever mechanism which includes a fusible metal. The assembly also includes a pre-assembled cover plate unit that consists of a disc having a central opening that is slid upwardly over the frame of the sprinkler head. The cover plate unit also includes a tubular sleeve having a pair of opposed notches which receive projections on the periphery of the disc. A decorative cover plate is secured through a fusible metal, such as solder, to the lower edge of the sleeve, and a coil spring, in a compressed condition, interconnects the upper end of the sleeve with the disc.

Abstract: An activator assembly for an automatic sprinkler head having a fluid flow control valve comprising releasable lever means serving to hold the valve closed, and a control assembly including a fusible element, heat conductive fin means and a retaining ring all mounted upon an axial post, the lever means abutting the retaining ring and being released by axial displacement of the retaining ring when the fusible element responds to a predetermined temperature.

Abstract: A partially concealed fast response sprinkler head having a body defining an inlet to be connected to a water line and having an outlet normally enclosed by a valve cap. The upper ends of a pair of lever members are supported on an internal shoulder in the body. Each lever member is generally semicircular in cross section and the lower ends of the lever members taper inwardly and define a central passage. The valve cap is provided with a threaded bore which receives a screw and the head of the screw engages a retaining bar, the ends of which bear against the upper ends of the respective lever members at a location spaced inwardly from the engagement of the lever members with the body, so that the force of the retaining bar against the lever members will tend to pivot the lower ends of the lever members outwardly away from each other.

Abstract: A concealed sprinkler with drop down deflector assembly includes a pair of frame arms which resemble a tuning-fork, there being a gap between the free end portions of the arms. As a result, the arms are not subject to assembly loads or system pressure loads. The drop down deflector assembly is mounted on the end portions of the arms. A preferred valve assembly includes a valve and a compound lever arrangement for holding a rigid thermal responsive element, such as a frangible glass bulb, and for adjusting compressive pre-load on the valve without loading the frame arms.

Abstract: An automatic sprinkler having a force transmitting mechanism for releasably maintaining a water outlet closed includes a frangible glass bulb having a very quick response characteristic to thermal input. Substantially less than one-half the force transmitted through the force transmitting mechanism is carried by the glass bulb.

Abstract: The invention relates to a fire protection sprinkler head having a base constructed for connection to a source of fire retardant fluid under pressure, a throat in the base through which fire retardant fluid can flow, a valve seat defined by the base about the periphery of the throat, and a resiliently flexible valve disk disposed across the throat and impressed upon the valve seat in sealing engagement. The valve seat has an arcuate profile segment, with a protuberant ridge disposed about the periphery of the throat and adjacent thereto. The ridge, in the region of its crest, defines a valve seat surface. The valve seat further has a recessed surface segment disposed radially outwardly of the throat, and divergent from a plane of the crest of the protuberant ridge.

Abstract: A concealed sprinkler including a body having a proximal portion and a distal portion. The distal portion includes an annular wall defining a chamber and an opening in communication with the chamber. A deflector assembly is disposed within the chamber. A trigger assembly having a lever assembly engaged with an inner surface of the annular wall supports the deflector assembly in the first position, the trigger assembly including and a thermally rated plate assembly having a lip portion to substantially circumscribe and substantially cover opening and chamber.