US3633676A - Flush-type sprinkler - Google Patents

Flush-type sprinkler Download PDF

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US3633676A
US3633676A US24596A US3633676DA US3633676A US 3633676 A US3633676 A US 3633676A US 24596 A US24596 A US 24596A US 3633676D A US3633676D A US 3633676DA US 3633676 A US3633676 A US 3633676A
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temperature
sprinkler
frame
ceiling
valve plug
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Expired - Lifetime
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US24596A
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Fred A Gloeckler
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GRUNAU SPRINKLER MANUFACTURING COMPANY Inc A WIS CORP
Star Sprinkler Corp of Florida
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Star Sprinkler Corp of Florida
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Assigned to CHEMETRON FIRE SYSTEMS, INC., A CORP. OF DE reassignment CHEMETRON FIRE SYSTEMS, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHEMETRON CORPORATION, A DE CORP.
Assigned to GRUNAU SPRINKLER MANUFACTURING COMPANY, INC., A WIS CORP. reassignment GRUNAU SPRINKLER MANUFACTURING COMPANY, INC., A WIS CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHEMETRON FIRE SYSTEMS, INC.
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/08—Control of fire-fighting equipment comprising an outlet device containing a sensor, or itself being the sensor, i.e. self-contained sprinklers
    • A62C37/09—Control of fire-fighting equipment comprising an outlet device containing a sensor, or itself being the sensor, i.e. self-contained sprinklers telescopic or adjustable
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/08—Control of fire-fighting equipment comprising an outlet device containing a sensor, or itself being the sensor, i.e. self-contained sprinklers
    • A62C37/10—Releasing means, e.g. electrically released
    • A62C37/11—Releasing means, e.g. electrically released heat-sensitive
    • A62C37/12—Releasing means, e.g. electrically released heat-sensitive with fusible links

Definitions

  • ABSTRACT A sprinkler is provided mounted flush in a ceiling and has an outer escutcheon plate releasably held in place by heat-responsive elements having a selected release temperature.
  • the escutcheon plate is normally in covering relation to a sprinkler which has a strut containing a heat-responsive element having a different selected release temperature. Heat-sensing fins movable downwardly below the ceiling line upon release of the escutcheon plate contribute to sensitivity.
  • a sprinkler having a sprinkler valve disposed above the level of a ceiling, the valve being retained in closed position by a strut and lever, the strut being releasable at a predetermined temperature.
  • the strut is provided with heat-sensing fins which are normally held in a horizontal position by an escutcheon plate which covers the valve and its release mechanism.
  • the escutcheon plate is held by elements which release it when a predetermined temperature occurs at the plate and the falling of the escutcheon plate permits the heat-sensing fins to fall and be exposed to the conditions prevailing in the vicinity.
  • FIG. 1 is a vertical sectional view of a sprinkler in accordance with the invention ready for use when required;
  • FIG. 2 is a view partly in vertical section and partly in elevation showing the release of the escutcheon plate and the release of the sprinkler valve;
  • FIG. 3 is a view in perspective of the escutcheon plate and its mounting as seen from the interior thereof;
  • FIG. 4 is a transverse sectional view, enlarged, taken approximately on the line 4-4 of FIG. 1;
  • FIG. 5 is a transverse sectional view, enlarged, taken approximately on the line 55 ofFIG. 1;
  • FIG. 6 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 6-6 of FIG. 1;
  • FIG. 7 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 7-7 of FIG. 1;
  • FIG. 8 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 88 of FIG. 2;
  • FIG. 9 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 9-9 of FIG. 2.
  • the sprinkler S includes a body 15 in threaded engagement at its upper end 16 in a-flush elbow or water-supply fitting 17, and with which a water supply pipe 18 is in threaded engagement.
  • the body 15 has an internal tapered bore 19 with a rim 20 at the lower end thereof.
  • the body 15 has a transverse flange 21 with a cylindrical frame 23 in threaded engagement therewith.
  • a cover 25 is provided held in place by a collar 26 carried on the threaded end 16.
  • the flange 21 has a pair of spaced openings 28 therein for the reception of a pair of guide rods 29 which have stop collars 30 at their upper ends to limit the downward movement thereof.
  • the rods 29 are carried at their lower ends in a crosshead 31 which has inclined faces 31a to facilitate fluid delivery.
  • a compression screw 32 in threaded engagement in the crosshead 31 has a head 33 thereon and carries a baffle plate 34.
  • the screw 32 has a conical tenninal end 35 which is engaged in a complimental opening 36 in a piston or valve plug 37.
  • the valve plug 37 has a lower rim 38 which engages the rim 20 and a plug portion 40 which extends upwardly in the bore 19.
  • the plug portion 40 has a peripheral packing 41 such as an O-ring for preventing fluid leakage.
  • the screwhead 33 has an actuator lever 44 engaged therewith.
  • the lever 44 is supported at one end on a pin 45 carried in the frame 23 and has its opposite end in engagement with a heat-releasable strut 46.
  • the strut 46 has a rod portion 47 with a locating collar 48.
  • the end of the rod portion 47 is supported on an inwardly extending rim 49 on the frame 23.
  • the strut 46 at the other end thereof has a cup portion 50 within which an insert 51 is provided of fusible eutectic alloy material, and melting at a predetermined temperature. In a particular embodiment this temperature can be F.
  • the insert 51 normally retains a ball 52 in its outward position and bearing on the rim 49, but upon melting permits the ball 52 to move inwardly in the cup portion 50 from its support position to a release position.
  • the outer surface of the cup portion 50 has secured thereto metallic ribbon like heat-sensing fins 54, of which are normally held in substantially horizontal positions by an escutcheon plate 55 but the free end of which can swing downwardly when released.
  • the escutcheon plate 55 covers the opening 11 in the ceiling 10 and is supported by clips 56 which engage between the frame 23 and a filler ring 57.
  • the clips 56 are secured to the escutcheon plate 55 by an eutectic alloy 58 which in a particular embodiment melts at 1 17 F.
  • the sprinkler S as shown in FIG. I is ready and in condition for operation when required.
  • the escutcheon plate 55 will be released from the clips 56 and fall. The free ends of the heat-sensing fins 54 will then fall and these are efi'ective for heat transfer to the strut 46.
  • the temperature effective on the insert 51 reaches the set value, i.e., the temperature at which the insert melts the pressure effective from above on the strut 46 and therefrom onto the ball 52 causes the ball 52 to move inwardly so that the strut 46 is also urged downwardly by force irnparted thereto through the actuator lever 44 by the screw 32.
  • the crosshead 31 and guide rods 29 drop to the extent permitted by the stop collars 30.
  • a sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling,
  • said body having a fluid supply connection and a discharge bore
  • first temperature-sensitive means responsive to a predetermined temperature carried by said frame
  • a cover plate disposed on the lower face of the ceiling in covering relation to said frame
  • second temperature-sensitive means responsive to a predetermined temperature releasably retaining said cover plate in position
  • said second temperature-sensitive means being interposed between said clips and said cover plate.
  • a sprinkler as defined in claim 1 in which said slidably mounted member has a compression screw engaged therein for retaining said valve plug in position.
  • a sprinkler as defined in claim 1 in which said means for retaining said valve plug includes an actuator lever pivotally carried by said frame and in engagement with said first temperature-sensitive means.
  • a sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling,
  • said body having a fluid supply connection and a discharge bore
  • first temperature-sensitive means responsive to a predetermined temperature carried by said frame
  • a cover plate disposed on the lower face of the ceiling in covering relation to said frame
  • second temperature-sensitive means responsive to a predetermined temperature releasably retaining said cover plate in position
  • heat-transmitting members being provided on said first mentioned temperature-sensitive means.

Abstract

A sprinkler is provided mounted flush in a ceiling and has an outer escutcheon plate releasably held in place by heatresponsive elements having a selected release temperature. The escutcheon plate is normally in covering relation to a sprinkler which has a strut containing a heat-responsive element having a different selected release temperature. Heat-sensing fins movable downwardly below the ceiling line upon release of the escutcheon plate contribute to sensitivity.

Description

United States Patent Inventor Fred A. Gloeckler Philadelphia, Pa. Appl. No. 24,596 Filed Apr. 1, 1970 Patented Jan. 11, 1972 Assignee Star Sprinkler Corporation of Florida Philadelphia, Pa.
FLUSH-TYPE SPRINKLER 7 Claims, 9 Drawing Figs.
US. Cl 169/40 Int. Cl A62c 37/08 Field of Search 169/37, 38, 39, 40, 41
References Cited UNITED STATES PATENTS 2,389,332 11/1945 Tyden 169/37 5/1883 Brown 169/41 2,21 1,399 8/1940 Winslow 169/39 346,796 8/1886 Andrew 169/40 348,531 8/1886 Montgomery 169/40 2,389,331 11/1945 Tyden 169/37 2,558,450 6/1951 Martin.. 169/37 3,459,266 8/1969 Ault 169/37 3,195,647 7/1965 Campbell et al 169/40 X Primary ExaminerM. Henson Wood, .lr. Assistant Examiner- Edwin D. Grant Attorney-Zachary T. Wobensmith, 2nd
ABSTRACT: A sprinkler is provided mounted flush in a ceiling and has an outer escutcheon plate releasably held in place by heat-responsive elements having a selected release temperature. The escutcheon plate is normally in covering relation to a sprinkler which has a strut containing a heat-responsive element having a different selected release temperature. Heat-sensing fins movable downwardly below the ceiling line upon release of the escutcheon plate contribute to sensitivity.
PATENTEU JAM 1 L972- 3633676 lAVF/VTQP. FRED A. GLOECKLER BYgTLO u4 ATTOR E).
PATENTEU JAN] 0 I972 SHEET 3 [IF 3 Mun/me FRED A. GLoEcKLER FLUSH-TYPE SPRINKLER This invention relates to sprinklers and more particularly to SUMMARY OF THE INVENTION In accordance with the invention a sprinkler is provided having a sprinkler valve disposed above the level of a ceiling, the valve being retained in closed position by a strut and lever, the strut being releasable at a predetermined temperature. The strut is provided with heat-sensing fins which are normally held in a horizontal position by an escutcheon plate which covers the valve and its release mechanism. The escutcheon plate is held by elements which release it when a predetermined temperature occurs at the plate and the falling of the escutcheon plate permits the heat-sensing fins to fall and be exposed to the conditions prevailing in the vicinity.
It is the principal object of the invention to provide a sprinkler flush-mounted at the ceiling and concealed by an escutcheon plate, both the escutcheon plate and the sprinkler valve being releasable responsive to predetermined temperatures.
It is a further object of the invention to provide a sprinkler of the character aforesaid in which the release of the escutcheon plate is utilized to position movable heat-sensing fins in a more effective location to control the sprinkler valve release.
It is a further object of the invention to provide a sprinkler flush-mounted at the ceiling in which an escutcheon plate effectively screens the sprinkler from view but does not prevent water release when needed.
It is a further object of the invention to provide a sprinkler of the character aforesaid which is simple in construction and reliable in its operation.
Other objects and advantageous features of the invention will be apparent from the description and claims.
BRIEF DESCRIPTION OF THE DRAWINGS The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:
FIG. 1 is a vertical sectional view of a sprinkler in accordance with the invention ready for use when required;
FIG. 2 is a view partly in vertical section and partly in elevation showing the release of the escutcheon plate and the release of the sprinkler valve;
FIG. 3 is a view in perspective of the escutcheon plate and its mounting as seen from the interior thereof;
FIG. 4 is a transverse sectional view, enlarged, taken approximately on the line 4-4 of FIG. 1;
FIG. 5 is a transverse sectional view, enlarged, taken approximately on the line 55 ofFIG. 1;
FIG. 6 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 6-6 of FIG. 1;
FIG. 7 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 7-7 of FIG. 1;
FIG. 8 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 88 of FIG. 2; and
FIG. 9 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 9-9 of FIG. 2.
It should, of course, be understood that the description and drawings herein are illustrative merely and that various modifications and changes can be made in the structure disclosed without departing from the spirit of the invention.
Like numerals refer to like parts throughout the several views.
DESCRIPTIONOF THE PREFERRED EMBODIMENT Referring now more particularly to the drawings, a portion of a ceiling 10 is illustrated, with an opening 11 therein at which the sprinkler S to be described is mounted, and with a lower face 12.
The sprinkler S includes a body 15 in threaded engagement at its upper end 16 in a-flush elbow or water-supply fitting 17, and with which a water supply pipe 18 is in threaded engagement.
The body 15 has an internal tapered bore 19 with a rim 20 at the lower end thereof.
The body 15 has a transverse flange 21 with a cylindrical frame 23 in threaded engagement therewith.
A cover 25 is provided held in place by a collar 26 carried on the threaded end 16.
The flange 21 has a pair of spaced openings 28 therein for the reception of a pair of guide rods 29 which have stop collars 30 at their upper ends to limit the downward movement thereof. The rods 29 are carried at their lower ends in a crosshead 31 which has inclined faces 31a to facilitate fluid delivery. A compression screw 32 in threaded engagement in the crosshead 31 has a head 33 thereon and carries a baffle plate 34. The screw 32 has a conical tenninal end 35 which is engaged in a complimental opening 36 in a piston or valve plug 37.
The valve plug 37 has a lower rim 38 which engages the rim 20 and a plug portion 40 which extends upwardly in the bore 19. The plug portion 40 has a peripheral packing 41 such as an O-ring for preventing fluid leakage.
The screwhead 33 has an actuator lever 44 engaged therewith. The lever 44 is supported at one end on a pin 45 carried in the frame 23 and has its opposite end in engagement with a heat-releasable strut 46.
The strut 46 has a rod portion 47 with a locating collar 48. The end of the rod portion 47 is supported on an inwardly extending rim 49 on the frame 23.
The strut 46 at the other end thereof has a cup portion 50 within which an insert 51 is provided of fusible eutectic alloy material, and melting at a predetermined temperature. In a particular embodiment this temperature can be F. The insert 51 normally retains a ball 52 in its outward position and bearing on the rim 49, but upon melting permits the ball 52 to move inwardly in the cup portion 50 from its support position to a release position.
The outer surface of the cup portion 50 has secured thereto metallic ribbon like heat-sensing fins 54, of which are normally held in substantially horizontal positions by an escutcheon plate 55 but the free end of which can swing downwardly when released.
The escutcheon plate 55 covers the opening 11 in the ceiling 10 and is supported by clips 56 which engage between the frame 23 and a filler ring 57.
The clips 56 are secured to the escutcheon plate 55 by an eutectic alloy 58 which in a particular embodiment melts at 1 17 F.
The mode of operation will now be pointed out.
The sprinkler S as shown in FIG. I is ready and in condition for operation when required.
If the ambient temperature at the escutcheon plate 55 rises to the set temperature, that is to an extent to melt'the eutectic alloy at 58, the escutcheon plate 55 will be released from the clips 56 and fall. The free ends of the heat-sensing fins 54 will then fall and these are efi'ective for heat transfer to the strut 46.
If and when the temperature effective on the insert 51 reaches the set value, i.e., the temperature at which the insert melts the pressure effective from above on the strut 46 and therefrom onto the ball 52 causes the ball 52 to move inwardly so that the strut 46 is also urged downwardly by force irnparted thereto through the actuator lever 44 by the screw 32.
The strut 46 and lever 44 drop and the valve plug 37 is moved outwardly and downwardly by the water pressure thereon.
The crosshead 31 and guide rods 29 drop to the extent permitted by the stop collars 30.
Water discharging through the bore 19 strikes the baffle plate 34 by which it is diverted outwardly in a well-known manner.
It will thus be seen that simple but effective structure has been provided for carrying out the objects of the invention.
lclaim:
l. A sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling,
said body having a fluid supply connection and a discharge bore,
a valve plug normally closing said bore,
a member slidably mounted with respect to said body and carrying a baffle plate for diverting water discharged from said discharge bore, and
means engaged with said member for retaining said valve plug in closed position including first temperature-sensitive means responsive to a predetermined temperature carried by said frame,
a cover plate disposed on the lower face of the ceiling in covering relation to said frame,
second temperature-sensitive means responsive to a predetermined temperature releasably retaining said cover plate in position, and
cover-plate-mounting clips in engagement with said frame,
and
said second temperature-sensitive means being interposed between said clips and said cover plate.
2. A sprinkler as defined in claim 1 in which said slidably mounted member has a compression screw engaged therein for retaining said valve plug in position.
3. A sprinkler as defined in claim 1, in which 7 said second temperature-responsive means is responsive to a lower temperature than the first temperature-responsive means.
4. A sprinkler as defined in claim 1 in which said means for retaining said valve plug includes an actuator lever pivotally carried by said frame and in engagement with said first temperature-sensitive means.
5. A sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling,
said body having a fluid supply connection and a discharge bore,
a valve plug normally closing said bore,
a member slidably mounted with respect to said body and carrying a baffle plate for diverting water discharged from said discharge bore, and
means engaged with said member for retaining said valve plug in closed position including first temperature-sensitive means responsive to a predetermined temperature carried by said frame,
a cover plate disposed on the lower face of the ceiling in covering relation to said frame, and
second temperature-sensitive means responsive to a predetermined temperature releasably retaining said cover plate in position,
heat-transmitting members being provided on said first mentioned temperature-sensitive means.
6. A sprinkler as defined in claim 5 in which said heat-transmitting members are releasably held in predetermined positions by said cover plate.
7. A sprinkler as defined in claim 6 in which said heat-transmitting members are metallic ribbons with pendant free ends in released position.

Claims (7)

1. A sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling, said body having a fluid supply connection and a discharge bore, a valve plug normally closing said bore, a member slidably mounted with respect to said body and carrying a baffle plate for diverting water discharged from said discharge bore, and means engaged with said member for retaining said valve plug in closed position including first temperature-sensitive means responsive to a predetermined temperature carried by said frame, a cover plate disposed on the lower face of the ceiling in covering relation to said frame, second temperature-sensitive means responsive to a predetermined temperature releasably retaining said cover plate in position, and cover-plate-mounting clips in engagement with said frame, and said second temperature-sensitive means being interposed between said clips and said cover plate.
2. A sprinkler as defined in claim 1 in which said slidably mounted member has a compression screw engaged therein for retaining said valve plug in position.
3. A sprinkler as defined in claim 1, in which said second temperature-responsive means is responsive to a lower temperature than the first temperature-responsive means.
4. A sprinkler as defined in claim 1 in which said means for retaining said valve plug includes an actuator lever pivotally carried by said frame and in engagement with said first temperature-sensitive means.
5. A sprinkler for mounting in a ceiling comprising a body with a frame normally disposed above the lower face of the ceiling, said body having a fluid supply connection and a discharge bore, a valve plug normally closing said bore, a member slidably mounted with respect to said body and carrying a baffle plate for diverting water discharged from said discharge bore, and means engaged with said member for retaining said valve plug in closed position including first temperature-sensitive means responsive to a predetermined temperature carried by said frame, a cover plate disposed on the lower face of the ceiling in covering relation to said frame, and second temperature-sensitive means responsive to a predetermined temperature releasably retaining said cover plate in position, heat-transmitting members being provided on said first mentioned temperature-sensitive means.
6. A sprinkler as defined in claim 5 in which said heat-transmitting members are releasably held in predetermined positions by said cover plate.
7. A sprinkler as defined in claim 6 in which said heat-transmitting members are metallic ribbons with pendant free ends in released position.
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Cited By (35)

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US3756321A (en) * 1972-04-05 1973-09-04 Star Sprinkler Corp Flush type sprinkler
US3783947A (en) * 1973-04-02 1974-01-08 Fire Protection Co Automatic sprinkler head
US3812915A (en) * 1973-06-04 1974-05-28 Factory Mutual Res Corp Discharge head having constant force plug retaining member
US3971443A (en) * 1974-08-22 1976-07-27 Factory Mutual Research Corporation Discharge head having dual function plug retaining member
US3998273A (en) * 1976-03-05 1976-12-21 The Reliable Automatic Sprinkler Company, Inc. Apparatus for use with a fire safety device
FR2371239A1 (en) * 1976-11-22 1978-06-16 Grunau Co Inc HIDDEN WATERING HEAD
US4109727A (en) * 1975-09-06 1978-08-29 Job Eduard J Dual-seal sprinkler system
US4596289A (en) * 1985-05-10 1986-06-24 Johnson Kimball W Quick response automatic fire sprinkler head
US4618002A (en) * 1984-03-13 1986-10-21 Grinnel Corporation Fire protection sprinkler head
US4785888A (en) * 1987-03-02 1988-11-22 The Reliable Automatic Sprinkler Co., Inc. Decorative quick response sprinkler
US4880063A (en) * 1987-04-13 1989-11-14 The Reliable Automatic Sprinkler Co., Inc. Adjustable concealed sprinkler
US4926946A (en) * 1988-11-08 1990-05-22 Central Sprinkler Corporation Pendent style sprinkler with cover
US4976320A (en) * 1989-05-25 1990-12-11 Central Sprinkler Corporation Concealed sprinkler with drop down deflector assembly, and improved fusible valve lever assembly
US5022468A (en) * 1988-10-18 1991-06-11 Wormald International Limited Automatic sprinkler activator
US5080176A (en) * 1989-05-25 1992-01-14 Central Sprinkler Corporation Directly mounted pendent-style sprinklers and covers
US5083616A (en) * 1989-05-25 1992-01-28 Central Sprinkler Corporation Ceiling sprinkler
US6114823A (en) * 1997-12-30 2000-09-05 Agf Manufacturing, Inc. Circuit and apparatus for sensing fluid flow
US6123153A (en) * 1998-12-30 2000-09-26 Grinnell Corporation Fire protection sprinkle and release mechanism
US6246333B1 (en) 1999-01-05 2001-06-12 Agf Manufacturing, Inc. Apparatus for sensing fluid flow and associated load control circuit
US6396404B1 (en) 1999-01-05 2002-05-28 Agf Manufacturing, Inc. Double check valve assembly for fire suppression system
US6497200B2 (en) 2001-03-08 2002-12-24 The Water Heater Industry Joint Research And Development Consortium Fuel-fired heating appliance with combustion chamber temperature-sensing combustion air shutoff system
US20030196609A1 (en) * 2001-03-08 2003-10-23 Stretch Gordon W. Fuel-fired heating appliance with temperature-based fuel shutoff system
US6691790B1 (en) * 1998-05-11 2004-02-17 Pnm, Inc. Fire-suppression sprinkler system and method for installation and retrofit
US6715451B2 (en) 2001-03-08 2004-04-06 The Water Heater Industry Joint Research And Development Consortium Fuel-fired heating appliance with combustion air shutoff system having frangible temperature sensing structure
EP1537918A1 (en) * 2003-12-01 2005-06-08 Pnr Italia S.R.L. Water-jet washing valve
US20060131036A1 (en) * 2000-05-17 2006-06-22 The Viking Corporation, A Corporation Of The State Of Michigan Compact pendant sprinkler head
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EP1888183A2 (en) * 2005-06-03 2008-02-20 Tyco Fire Products LP Residential flat plate concealed sprinkler
US20090166047A1 (en) * 2006-01-18 2009-07-02 Goran Sundholm Sprinkler
US20110203814A1 (en) * 2010-02-24 2011-08-25 The Viking Corporation Deflector Carrier
US20150136432A1 (en) * 2013-11-19 2015-05-21 Protector Safety Ind., Ltd. Fire sprinkler with improved protective shell
US20150283414A1 (en) * 2013-11-19 2015-10-08 Protector Safety Ind., Ltd. Concealed sprinkler head cover adjusting device
US9452305B2 (en) * 2014-08-04 2016-09-27 Factory Mutual Insurance Company Radiation-activated sprinkler and related methods
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US20210146178A1 (en) * 2013-03-13 2021-05-20 Tyco Fire Products Lp Cpvc sprinkler assembly with support member

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Cited By (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756321A (en) * 1972-04-05 1973-09-04 Star Sprinkler Corp Flush type sprinkler
US3783947A (en) * 1973-04-02 1974-01-08 Fire Protection Co Automatic sprinkler head
US3812915A (en) * 1973-06-04 1974-05-28 Factory Mutual Res Corp Discharge head having constant force plug retaining member
US3971443A (en) * 1974-08-22 1976-07-27 Factory Mutual Research Corporation Discharge head having dual function plug retaining member
US4109727A (en) * 1975-09-06 1978-08-29 Job Eduard J Dual-seal sprinkler system
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