Sprinkler head

Abstract

There is provided a sprinkler head having a structure in which steps such as removing and reattaching a protecting cap are eliminated at the time of construction of the sprinkler head, where a cylindrical member is installed on an outer portion of a sprinkler head body and the protecting cap is installed between the sprinkler head body and the cylindrical member. A cylindrical member and a sprinkler head body are installed by being engaged so as to be rotatable together, a protecting cap configured to protect the sprinkler head body from an external force is locked to the cylindrical member. The protecting cap is provided with a space in which a tightening tool for connecting a sprinkler head to a water supply pipe is capable of locking to a tightening tool engaging portion.

Claims

1. A sprinkler head comprising: a sprinkler head body; a cylindrical member attached to a protecting cap, the sprinkler head body and the cylindrical member engaging each other so as to be rotatable together; and a deflector located under the cylindrical member; wherein the cylindrical member that is hollow includes: a flat surface, a side surface that forms a cylindrical wall entirely continued circumferentially and forms a space towards the deflector, and that extends from the flat surface toward the deflector, the flat surface closes an upper end of the side surface, and the flat surface is formed with a plurality of openings to form a tightening tool engaging portion; wherein the space is formed directly underneath of each opening which allows a tightening tool for connecting the sprinkler head to a water supply pipe to be locked thereto, each opening is formed in the side surface continuously from the flat surface; and, wherein a plurality of holes which allow the tightening tool to be locked to the tightening tool engaging portion are formed in a lower surface of the protecting cap.

2. The sprinkler head according to claim 1, wherein a plurality of projecting portions extending in the direction of the outer circumference are provided on a side surface of the protecting cap, side surfaces of the adjacent projecting portions facing each other serve as guides to allow insertion of the tightening tool through spaces between the side surfaces of the facing projecting portions.

3. The sprinkler head according to claim 1, wherein each hole is provided at positions corresponding to each opening of the cylindrical member.

4. The sprinkler head according to claim 1, wherein the protecting cap is provided with a cylindrical portion extending from the holes to edges of the openings of the cylindrical member to allow the tightening tool to be guided to the tightening tool engaging portion.

5. The sprinkler head according to claim 1, wherein the protecting cap fits a lower end opening of the cylindrical member.

6. The sprinkler head according to claim 1, wherein the protecting cap is locked to the tightening tool engaging portion of the cylindrical member.

7. The sprinkler head according to claim 1, wherein beam portions configured to isolate the openings of the cylindrical member are formed with reinforcing portions formed by bending or folding edges of the beam portions, and the protecting cap is locked to the reinforcing portions.

8. The sprinkler head according to claim 1, further comprising a support base under the flat surface of the cylindrical member, and the support base is provided with notches which conform to the shape of the flat surface having the openings.

9. The sprinkler head according to claim 8, wherein the protecting cap engages the notches of the support base.

10. The sprinkler head according to claim 1, wherein the protecting cap is formed with a handle, and the handle includes a fragile portion which is broken when the handle is rotated at a predetermined or greater torque.

11. The sprinkler head according to claim 1, wherein the side surface extends perpendicularly from the flat surface downwardly.

12. A sprinkler head comprising: a sprinkler head body; a cylindrical member attached to a protecting cap, the sprinkler head body and the cylindrical member engaging each other so as to be rotatable together; and a deflector located under the cylindrical member, wherein the cylindrical member includes a flat surface, and a side surface that extends from the flat surface toward the deflector and forms a space, the flat surface closes an upper end of the side surface, and the flat surface is formed with a plurality of openings to form a tightening tool engaging portion; wherein the space is formed directly underneath of each opening which allows a tightening tool for connecting the sprinkler head to a water supply pipe to be locked thereto; each opening is formed in the side surface continuously from the flat surface; And wherein a plurality of holes which allow the tightening tool to be locked to the tightening tool engaging portion are formed in a lower surface of the protecting cap.

13. The sprinkler head according to claim 12, wherein a gap is between the side surface and an axis of the cylinder.

14. A sprinkler tool system comprising: a sprinkler head according to claim 1, and a tightening tool having an engaging portion configured to connect to the sprinkler head and engageable with the opening of the cylinder member.

15. The tightening tool according to claim 14, wherein the tightening tool is between the side surface and an axis of the cylinder.

16. The tightening tool according to claim 14, wherein the tightening tool is inserted along an inside of the side surface and parallel to the side surface.

17. A sprinkler tool system comprising: a sprinkler head according to claim 12, and a tightening tool having an engaging portion configured to connect to the sprinkler head and engageable with the opening of the cylinder member.

18. The tightening tool according to claim 17, wherein the tightening tool is inserted along an inside of the side surface and parallel to the side surface.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a cross-sectional view of a sprinkler head according to a first embodiment.

(2) FIG. 2 is an exploded cross-sectional view of FIG. 1 (including a protecting cap).

(3) FIG. 3(a) is a plan view of FIG. 2, FIG. 3(b) is a plan view of the support base, and FIG. 3(c) is a cross-sectional view taken along the line X-X.

(4) FIG. 4 is a cross-sectional view of a state in which the protecting cap is mounted on the sprinkler head.

(5) FIG. 5 is a bottom view viewed from the bottom surface side of the protecting cap in FIG. 4.

(6) FIG. 6 is a cross-sectional view in which the sprinkler head according to the first embodiment is operated.

(7) FIG. 7 is a cross-sectional view of a state in which the protecting cap is mounted on the sprinkler head according to a second embodiment.

(8) FIG. 8 is a bottom view of FIG. 7.

(9) FIG. 9 is a plan view of a tightening tool according to a third embodiment.

(10) FIG. 10 is a plan view of a state in which the tightening tool in FIG. 9 is mounted on the sprinkler head.

(11) FIG. 11 illustrates a state in which the protecting cap is mounted in FIG. 12.

(12) FIG. 12 is a cross-sectional view of the sprinkler head in the related art.

(13) FIG. 13 is a cross-sectional view of a state in which the protecting cap is mounted on the sprinkler head according to a fourth embodiment.

(14) FIG. 14 is a plan view of a modification of the first embodiment.

(15) FIG. 15 is a modification of a cross-sectional shape taken along Y-Y in FIG. 14.

BEST MODES FOR CARRYING OUT THE INVENTION

First Embodiment (FIG. 1 to FIG. 6)

(16) Referring now to FIG. 1 to FIG. 6, a first embodiment will be described. A sprinkler head SH according to the first embodiment includes a sprinkler head body 1, a cylindrical member 2, a retainer 3, and a cover plate 4.

(17) The sprinkler head body 1 includes a male screw 6 to be connected to a water supply pipe 5 on the outer portion thereof, and a nozzle 6A indicated by a dotted line in the drawing is provided in the interior of the male screw 6. A hexagonal portion 7 is formed at a base of the male screw 6. Two arms 8 extend downward from the hexagonal portion 7, and the arms 8 are joined to an extension portion in the center of the nozzle 6A, so that a boss 9 is formed. The respective arms 8, 8 are formed respectively with holes 8A in the vicinity of the boss 9, and pins 10 are inserted into the holes 8A. Flange portions 10A are formed at the ends of the pins 10 on the side of the nozzle 6A, and the pins 10 can be engaged with ends of the holes 8A.

(18) The other ends of the pins 10 engage a plate-shaped deflector 11. The pins 10 are slidable within the holes 8A, and the deflector 11 is also slidable in association with the sliding movement of the pins 10.

(19) An exit of the nozzle 6A is closed by a valve 12, and a glass bulb 13 formed by injecting alcohol into a glass tube is installed between the valve 12 and the boss 9. The glass bulb 13 is pressed toward the valve 12 by an impress screw 14 screwed through the interior of the boss 9. The glass bulb 13 is configured in such a manner that when alcohol in the interior thereof is expanded and hence the glass tube explodes in case of a fire, the valve 12 is released and the nozzle is opened, so that water in the water supply pipe 5 is discharged.

(20) The cylindrical member 2 has a cylindrical shape, and an upper end thereof is closed by a flat surface 21. The flat surface is fixedly installed between the hexagonal portion 7 and the arms 8 of the sprinkler head body 1. The flat surface 21 is formed with a hexagonal hole 2A which can be fitted to the hexagonal portion 7, and a extending portion 2B extending upright along the side surface of the hexagonal portion 7 is formed at a peripheral edge of the hexagonal hole 2A. The extending portion 2B is bent at a distal end of the extending portion 2B after having been mounted over the hexagonal portion 7 inward of the hexagonal hole 2A and the cylindrical member 2 on the sprinkler head body 1 is fixedly install.

(21) Openings 2C are formed in the vicinity of the hexagonal hole 2A from the flat surface 21 to the side surface 22. The openings 2C are arranged at regular intervals along a peripheral edge of the flat surface 21, and the openings 2C are provided at six positions in this embodiment.

(22) It is also possible to interpose a support base 23 when inserting the hexagonal portion 7 into the hexagonal hole 2A of the flat surface 21. The support base 23 has a plate shape as illustrated in FIG. 3(b) and is formed with a hole 23A having the same shape as the hexagonal hole 2A at the center thereof, and has notches 23B having the shape of the openings 2C along the peripheral edge thereof. The support base 23 is formed with projections 23C projecting from the flat surface 21 side, and the projections 23C engage holes A formed through beam portions 2F formed between adjacent openings 2C, so that the cylindrical member 2 and the support base 23 are capable of rotating together.

(23) An excessive load is applied to the cylindrical member 2 via the intermediary of the support base 23 when the sprinkler head SH is mounted onto and demounted from the water supply pipe by using a tightening tool 40, described later, so that the openings 2C (the edge of the beam portions 2F) are prevented from being deformed and damaged. In addition, by reinforcing the tightening tool engaging portion with the support base 23, the cylindrical member 2 may be formed so as to be thin.

(24) In order to obtain the same effect as described above, if the edges of the openings 2C are bent to provide edge portions extending upright or when the upright portions are bent toward the beam portions 2F between the openings 2C, the strength of the edge portion of the openings 2C is improved. Also, the beam portions 2F may be formed with reinforcing ribs for preventing deformation of the beam portions 2F when mounting and demounting the sprinkler head SH to the water supply pipe by the tightening tool 40.

(25) On the side surface 22 of the cylindrical member 2 is formed with a helical groove 2D as connecting means for connection to the retainer 3. The helical groove 2D may be formed by using rolling process by making the cylindrical member 2 a thin member. The helical groove 2D is engaged with the projection 3A formed on the outer peripheral surface of the retainer 3 by being screwing together, so that the heightwise position of the retainer 3 can be adjusted. The lower portion of the cylindrical member 2 is an opening 2E.

(26) The retainer 3 is configured to be connected with the cylindrical member 2 as described above. The retainer 3 has a cylindrical shape and is formed with a flange portion 3B at a lower end thereof. In addition, a plurality of legs 3C extend downward from the flange portion 3B.

(27) Distal ends of the legs 3C are bent horizontally, and are formed with a connecting surface 3D to be connected to the cover plate 4. A low melting point alloy 16 is interposed between the connecting surface 3D and the cover plate 4, and the cover plate 4 and the connecting surface 3D are joined to each other by the low melting point alloy 16.

(28) Since the low melting point alloy 16 is melted by heat in case of a fire to release the cover plate 4, at temperatures lower than the temperature at which the glass bulb 13 explodes is selected as the melting temperature of the low melting point alloy 16.

(29) The cover plate 4 is a disk-shaped thin plate and the peripheral edge is bent toward the retainer 3. A surface of the cover plate 4 opposite from the surface connected to the retainer 3 (the surface viewed from the room interior side) is decorated in substantially the same color as ceiling board 45. As the material of the cover plate 4, copper or a copper alloy having a good joining property with respect to the low melting point alloy 16 is suitable. When a resilient member (not shown) is installed between the cover plate 4 and the flange portion 3B of the retainer 3, dropping of the cover plate 4 due to the melting of the low melting point alloy 16 in case of a fire is accelerated.

(30) FIG. 4 shows a cross-sectional view of a state in which a protecting cap 30 is mounted. The protecting cap 30 has a closed-bottomed cylindrical shape, and a plurality of projecting portions 31 extending in the direction of the outer circumference are formed on the side surface thereof. Distal ends of the projecting portions 31 are engaged with the above-described openings 2C, so that the place and position of installation correspond to the openings 2C. The projecting portions 31 are composed of two side surface portions 32 and an outer surface portion 33 between the side surface portions 32, 32.

(31) Distal end portions 32A of the side surface portions 32 are formed so as to project from an opening 34 of the protecting cap 30, and are locked to the beam portions 2F between the openings 2C of the cylindrical member 2. The distal end portions 32A are formed with steps 32B which are capable of maintaining the engaging state with the beam portions 2F. Through the engagement of the protecting cap 30 with the beam portions 2F of the cylindrical member 2, spaces S which are capable of penetrating from the lower end opening 2E of the cylindrical member 2 to the openings 2C are formed in the flat surface 21 of an upper end thereof. The outer surface portion 33 of the protecting cap 30 is installed in the proximity to the inner peripheral surface of the cylindrical member 2.

(32) FIG. 5 illustrates a state of the sprinkler head in FIG. 4 viewed from the bottom surface side of the protecting cap 30. In FIG. 5, the spaces S which are capable of penetrating to the openings 2C of the cylindrical member 2 are provided between the projecting portions 31 of the protecting cap 30, so that the tightening tool 40 can be inserted into the spaces S. The tightening tool 40 inserted through the spaces S is engageable with the edges of the openings 2C (the edges of the beam portions 2F) via the side surface portions 32 of the protecting cap 30. Therefore, mounting onto the water supply pipe 5 by using the tightening tool 40 can be performed in a state in which the sprinkler head has the protecting cap 30 mounted thereon.

(33) When causing an engaging portion 41 at the distal end of the tightening tool 40 to be inserted into the spaces S, the engaging portion 41 is guided to the opening 2C by the side surface portions 32, 32 of the projecting portions 31, and the side surface portions 32, 32 serve as a guide.

(34) Even when an attempt is made to mount the retainer 3 on the cylindrical member 2 in a state in which the protecting cap 30 is mounted on the cylindrical member 2, the end of the cylindrical portion of the retainer 3 abuts the projecting portions 31 of the protecting cap 30 and hence the projection 3A of the retainer 3 cannot be screwed into the helical groove 2D of the cylindrical member 2. Therefore, when installing the retainer 3 on the cylindrical member 2, forgetting to remove the protecting cap 30 is prevented.

(35) Subsequently, the procedure of installation of the sprinkler head described above will be described.

(36) The sprinkler head is in a state in which the cylindrical member 2 has been installed on the outside of the sprinkler head body 1 and the protecting cap 30 is engaged with the cylindrical member 2 in a stage before being connected to the water supply pipe.

(37) The tightening tool 40 is inserted into the cylindrical member 2 from the bottom side of the protecting cap 30, the engaging portion 41 at the distal end of the tightening tool 40 is engaged with the opening 2C to screw the male screw 6 of the sprinkler head body 1 into the female screw formed at a terminal of the water supply pipe 5 to connect the water supply pipe to the sprinkler head.

(38) As the next step, the ceiling board 45 is installed. A hole 45A is formed in the ceiling board 45 where the sprinkler head is installed, and a distal end of the protecting cap 30 mounted on the sprinkler head body 1 projects from the ceiling surface after the installation of the ceiling board 45.

(39) Subsequently, the protecting cap 30 is removed to allow the retainer 3 to be installed on the cylindrical member 2. At that time, even when an attempt is made to mount the retainer 3 in a state in which the protecting cap 30 is mounted on the cylindrical member 2, the projecting portions 31 of the protecting cap 30 abut the end of the cylindrical portion of the retainer 3 and hence the projection 3A cannot be screwed into the helical groove 2D of the cylindrical member 2. Therefore, forgetting to remove the protecting cap 30 is prevented.

(40) The projection 3A formed on the side surface of the retainer 3 is screwed into the helical groove 2D of the cylindrical member 2 and the flange portion 3B connected to the lower portion of the retainer 3 is adjusted to come to the position where the flange portion 3B abuts the ceiling board 45. Accordingly, the installation of the sprinkler head is completed.

(41) Subsequently, the operation of the sprinkler head will be described.

(42) The sprinkler head body 1 is connected to the water supply pipe 5 in the ceiling filled with water, and is arranged so that only the cover plate 4 is visible from the ceiling surface as described above. In case of a fire, the low melting point alloy 16 connecting the cover plate 4 and the retainer 3 is melt by the heat of the fire.

(43) When the low melting point alloy 16 melts, the joint strength is lowered, the cover plate 4 drops, and the sprinkler head body 1 installed in the ceiling is exposed. As a result of the demounting of the cover plate 4, hot air of the fire flows also into the cylindrical member 2, and the glass bulb 13 is heated.

(44) When the glass bulb 13 is heated and the alcohol in the interior is expanded, the glass bulb 13 explodes and the valve 12 comes apart from the terminal end of the nozzle 6A, so that the nozzle 6A is released.

(45) The water filled in the water supply pipe 5 is discharged from the nozzle 6A, and the water hitting the deflector 11 on the extension portion of the nozzle 6A flies in all directions in the room to prevent the fire from spreading, and extinguish the fire (see FIG. 6).

Second Embodiment (FIGS. 7, 8)

(46) Subsequently, referring now to FIGS. 7 and 8, a second embodiment will be described. Parts having the same structure as those in the first embodiment are designated by the same reference numeral and the description will be omitted.

(47) In the second embodiment, as illustrated in FIGS. 7 and 8, a protecting cap 30A has a lid shape, and a edge portion 35 of the protecting cap 30A is fitted to the opening 2E at the lower end of the cylindrical member 2. Holes 37 which allow penetration from a lower surface 36 of the protecting cap 30A to the openings 2C of the cylindrical member 2 are formed in the protecting cap 30A. The holes 37 corresponds to the position and the number of the openings 2C.

(48) As illustrated by a double dashed chain line in FIG. 7, it is also possible to form cylindrical portions 37A extending from the holes 37 to the edge of the openings 2C. Distal ends of the cylindrical portions 37A may be locked to the edges of the openings 2C in the same manner as in the first embodiment. In this case, since the protecting cap 30A is locked by the openings 2C, it is not necessary to cause the edge of the protecting cap 30A to be locked by the opening 2E at the lower end of the cylindrical member 2.

(49) The holes 37 and the cylindrical portions 37A have a role as a guide which guides the engaging portion 41 at the distal end of the tightening tool 40 into the openings 2C of the cylindrical member 2.

(50) In FIG. 7 and FIG. 8, although the protecting cap 30A is formed into a lid shape formed of a thin plate, and may be formed into a thinner film shape. It is also possible to adhere the protecting cap 30A formed into a film shape to a lower end surface or the outer peripheral surface of the cylindrical member 2. By employing the film transparent or translucent which allows the interior to be seen through, the position of the openings 2C can be confirmed easily in a state in which the film is not broken.

(51) The film-shaped protecting cap 30A may be broken by being stuck by an engaging portion 41 at the distal end of the tightening tool 40, so that the male screw 6 can be screwed into the female screw of the water supply pipe 5 by engaging the engaging portion 41 with the openings 2C and causing the tightening tool 40 and the sprinkler head to rotate together.

Third Embodiment (FIGS. 9, 10)

(52) Referring further to FIGS. 9, 10, a third embodiment will be described. In the third embodiment as well, parts having the same structure as those in the first embodiment are designated by the same reference numeral and the description will be omitted.

(53) In the third embodiment, the modes of the sprinkler head SH and the protecting cap 30 are the same as those in the first embodiment. Different points are that the tightening tool 40A is configured to be engageable with the openings 2C from the flat surface 21 side at the upper end of the cylindrical member 2.

(54) The tightening tool 40A has a rink shape and is partly notched, and the width of a notched portion 46 is on the order of allowing the male screw 6 to pass through. The tightening tool 40A is formed with a plurality of projections 47 engageable with the openings 2C on the inner peripheral edge of the tightening tool 40A. In FIGS. 9 and 10, three of the projections 47 are formed and the positions of the projections correspond to the openings 2C. A handle 48 is installed on the outer peripheral portion of the tightening tool 40A.

(55) When the male screw 6 of the sprinkler head body 1 is connected to the water supply pipe 5 by locking the tightening tool 40A with the openings 2C, the notched portion 46 is inserted into the male screw 6, and then the projections 47 is engaged with the openings 2C of the cylindrical member 2. In a state in which the projections 47 is engaged with the openings 2C, the handle 48 is rotated to cause the male screw 6 to be screwed in a female screw, not shown, at a terminal end of the water supply pipe 5.

(56) After the male screw 6 is connected to the water supply pipe 5, the tightening tool 40A is moved toward the water supply pipe 5 to disengage the projections 47 and the openings 2C. The notched portion 46 is inserted into the male screw 6 and the tightening tool 40A is removed, so that the operation is terminated.

(57) In the third embodiment, the operation can be performed without touching the protecting cap 30 when connecting the sprinkler head body 1 to the water supply pipe 5.

Fourth Embodiment (FIG. 13)

(58) Referring further to FIG. 13, a fourth embodiment will be described. In the fourth embodiment as well, parts having the same structure as those in the first embodiment are designated by the same reference numeral and the description will be omitted.

(59) The different point of the fourth embodiment from the protecting cap 30 in the first embodiment is that a handle H is provided on a bottom surface, and the male screw 6 is configured to be capable of being screwed into the female screw of the water supply pipe 5 by rotating the handle H. A protecting cap 30B of the fourth embodiment includes the handle H formed so as to extend downward from the bottom surface of the protecting cap 30B as illustrated in FIG. 13, and the handle H and the protecting cap 30B are connected by a small diameter portion H1 of the protecting cap 30B having a smallest outer diameter. The small diameter portion H1 is a fragile portion which is broken when a predetermined or more torque is applied when being screwed into the water supply pipe 5, and is configured to prevent the breakage of the male screw 6 or the water supply pipe 5 due to the excessive tightening of the screw.

(60) More specifically, when the male screw 6 is screwed into the female screw in a state in which the protecting cap 30B is mounted on the sprinkler head, the handle h is rotated to screw the male screw 6 into the female screw of the water supply pipe 5. When the male screw 6 is screwed into the female screw of the water supply pipe 5, if the male screw 6 is tightened toward the water supply pipe 5 more than necessary, an excessive load is applied, and the male screw 6 or the water supply pipe 5 may be broken and hence leakage may occur. However, when the male screw 6 or the water supply pipe 5 are rotated at a predetermined or more torque in the state before the male screw 6 or the water supply pipe 5 are broken, the small diameter portion H1 is broken and hence the sprinkler head cannot be rotated any longer, so that the breakage of the male screw 6 and the water supply pipe 5 due to the excessive tightening of the screw portion is prevented. The specific value of the torque that breaks the small diameter portion H1 is within a range from 40N.Math.m to 60N.Math.m.

Modification of the First Embodiment (FIGS. 14, 15)

(61) Referring to FIGS. 14 and 15, a modification of the First Embodiment (FIGS. 14, 15) will be described. Parts having the same structure as those in the first embodiment are designated by the same reference numeral and the description will be omitted.

(62) In FIG. 14, edge portions 23A of the support base 23 is formed so as to protrude from the openings 2C, and the step 32B of the protecting cap 30 is locked by the edge portions 23A. By the engagement of the protecting cap 30 with the support base 23, the engaging portion 41 of the tightening tool 40 rotates in a state of pressing the side surface of the edge portions 23A of the support base 23 while coming into abutment with the side surface portions 32 of the protecting cap 30 when connecting the sprinkler head to the water supply pipe 5 by the tightening tool 40, so that the male screw 6 of the sprinkler head body 1 can be screwed into the female screw, not shown, of the water supply pipe 5.

(63) At this time, since the thickness of the support base 23 is larger than the thickness of the beam portions 2F, the mechanical strength is high, and the force applied from the tightening tool 40 when connecting the sprinkler head to the water supply pipe 5 is received by the support base 23, so that the deformation and breakage of the beam portions 2F is prevented.

(64) Furthermore, as a modification of FIG. 14, a configuration in which depressions having the shape of the beam portions 2F are formed on a surface of the support base 23 facing the beam portions 2F of the support base 23 and the beam portions 2F are fitted to the depression is also applicable.

(65) In order to obtain the same effects as those described above, FIG. 15 illustrates a modification of a cross-sectional shape taken along Y-Y in FIG. 14. As an example of the openings 2C (the edges of the beam portions 2F) formed with reinforcing portions, as illustrated in FIG. 15(a), the mechanical strength of a portion where a force is applied from the engaging portion 41 may be improved by forming upright portions 2G by bending edges of the beam portions 2F. In addition as another modification, as illustrated in the same drawing (b), by forming a returning portions 2H formed by bending the edges of the beam portions 2F and folding distal ends toward the beam portions 2F, the mechanical strength of the portion to which the force is applied from the engaging portion 41 may be improved.

(66) By forming the reinforcing portions on the openings 2C (the edges of the beam portions 2F) by the upright portions 2G and the returning portions 2H, the deformation or the breakage of the beam portions 2F by the force applied from the tightening tool 40 when connecting the sprinkler head to the water supply pipe 5 is prevented.

(67) In the first to the fourth embodiment, the configuration in which the glass bulb is integrated in the sprinkler head body 1 has been described. However, the present invention is not limited thereto, and the sprinkler head having a mechanism described in Japanese Unexamined Patent Application Publication No. 7-284545 may be used.

REFERENCE SIGNS LIST

(68) 1 sprinkler head body 2 cylindrical member 2A hexagonal hole 2B extending portion 2C opening 2D helical groove 2E opening 2F beam portion 3 retainer 3A projection 3B flange portion 3C leg 3D connecting surface 4 cover plate 5 water supply pipe 6 male screw 7 hexagonal portion 8 arm 11 deflector 12 valve 13 glass bulb 14 impress screw 16 low melting point alloy 30 protecting cap 31 projecting portions 32 side surface portions 33 outer surface portion 34 opening 40 tightening tool S space SH sprinkler head