Patent Publication Number: US-7222678-B2

Title: Sprinkler head

Description:
PRIORITY CLAIM 
   This is a U.S. national stage of application No. PCT/KR2004/000492, filed on 10 Mar. 2004. Priority is claimed on the following application(s): Country: South Korea, Application No.: 10-2003-0014696, Filed: 10 Mar. 2003; Country: Japan, Application No.: 2003-337223, Filed: 29 Sept. 2003; Country: South Korea, Application No.: 10-2003-0071825, Filed: 15 Oct. 2003; Country: South Korea, Application No.: 10-2004-0015932, Filed: 9 Mar. 2004, the content of which is incorporated here by reference. 
   TECHNICAL FIELD 
   The present invention relates to a sprinkler head, and more particularly, to a sprinkler head capable of performing a fast fire extinguishment by quickening a reaction speed at the time of a fire occurrence and capable of making an indoor appearance to be fine. 
   BACKGROUND ART 
     FIG. 1  is a sectional view showing a sprinkler head in accordance with the conventional art. 
   The conventional sprinkler head comprises: a first housing  104  connected to a water supply pipe  102  disposed inside a building ceiling  106 ; a second housing  110  coupled to the first housing  104  and disposed at a penetration hole  108  formed at the ceiling  106 ; a deflector  112  disposed in the second housing  110  and adhered to the first housing  104  in a sealing-available manner, for maintaining a sealing state of the first housing  104  in the ordinary time and spraying water all around at the time of a fire occurrence by being detached from the first housing  104 ; a locking unit  114  locked at an inner circumferential surface of a lower end of the second housing  110  for supporting the deflector  112  and thus maintaining the sealing state of the first housing  104 ; a heat responding unit  116  mounted at a lower side of the locking unit  114  for sensing heat at the time of a fire occurrence and thus releasing a locking of the locking unit  114 ; and a head cover  160  for covering the heat responding unit  116  thereby to protect the heat responding unit  116  and making an appearance of a part exposed to outside to be fine. 
   The deflector  112  includes: a deflector ring  130  inserted into an outer circumferential surface of a lower side of the first housing  104  in a linear-movable manner; a sealing cap  134  adhered to a lower surface of the first housing  104  for sealing the first housing  104 ; a water spray plate  136  fixed to an outer circumferential surface of the sealing cap  134  for spraying water all around at the time of a fire occurrence; and a plurality of supporters  132  for connecting the deflector ring  130  and the water spray plate  136 . 
   The locking unit  114  includes: a first loading plate  120  contacting a lower surface of the sealing cap  134  of the deflector  112 , having a screw hole  128  at the center thereof, and having an inclination surface at the edge thereof; a second loading plate  122  facing the first loading plate  120  and having an inclination surface at the edge thereof; and a locking ring  124  disposed at the inclination surface between the first loading plate  120  and the second loading plate  122  and widened when the first loading plate  120  and the second loading plate  122  are adhered to each other thus to be locked in a locking groove  126  formed at an inner circumferential surface of a lower side of the second housing  110 . 
   The heat responding unit  116  includes: a plurality of heat collecting plates  152 ,  154 , and  156  mounted at a lower side of the second loading plate  122  for heat-collecting at the time of a fire occurrence; a fuse metal  140  mounted at lower surfaces of the heat collecting plates  152 ,  154 , and  156  and melted when heat transmitted through the heat collecting plates  152 ,  154 , and  156  reaches a certain temperature; and a locking screw  142  coupled to the screw hole  128  formed at the first loading plate  120  for integrally coupling the first and second loading plates  120  and  122 , the heat collecting plates  152 ,  154 , and  156 , and the fuse metal  140 . 
   The head cover  160  is composed of a cylindrical protection container  162  coupled to an outer circumference surface of a lower side of the second housing  110 , and a cover plate  164  adhered to a lower surface of the protection container  162 . 
   The protection container  162  and the cover plate  164  are adhered to each other by a lead  166 , so that the lead  166  is melted when the temperature reaches a certain degree and thereby the cover plate  166  is separated from the protection container  162 . 
   In the sprinkler head according to the first embodiment of the conventional art, at the time of a fire occurrence, firstly, an indoor temperature is increased and thereby the lead  166  adhered between the protection container  162  and the cover plate  166  is melted thus to separate the protection container  162  from the cover plate  164 . 
   Secondly, the heat collecting plates  152 ,  154 , and  156  disposed inside the protection container  162  are heated thus to transmit heat to the fuse metal  140  mounted at the lower side of the heat collecting plates  152 ,  154 , and  156 . When the temperature of the heat transmitted to the fuse metal  140  reaches a certain degree, the fuse metal  140  is melted thus to widen the interval between the first loading plate  120  and the second loading plate  122 . According to this, the locking ring  124  is restored to the original state thereby to be detached from the locking groove  126  formed at the second housing  110 . 
   Then, the locking unit  114  and the heat responding unit  116  are detached from the second housing  110 , and the deflector  112  is moved downwardly, thereby locking the deflector ring  130  into the locking groove  126  of the second housing  110 . At this time, the sealing state of the second housing  110  is released and thereby water is drained through the second housing  110 . The water is sprayed all around by the water spray plate  136  of the deflector  112  thus to extinguish fire. 
   However, in the sprinkler head according to the first embodiment of the conventional art, the cover plate  164  is detached from the protection container  162  firstly by heat at the time of a fire occurrence, and then the heat collecting plates  152 ,  154 , and  156  disposed inside the protection container  162  are heated secondly thus to perform a heat responding operation. According to this, a reaction speed is slow and a water spraying time is delayed thus to have a difficulty in extinguishing the initial fire and have a problem that the fire spreads seriously. 
   DISCLOSURE OF THE INVENTION 
   Therefore, it is an object of the present invention to provide a sprinkler head having a fine appearance by installing a head cover at a part of the sprinkler head exposed to outside and capable of enhancing a performance thereof by quickening a reaction speed by making the head cover perform a heat collection function at the time of a fire occurrence. 
   Another object of the present invention is to provide a sprinkler head capable of enhancing a reliability by preventing an erosion and a mis-operation of the sprinkler head by preventing foreign materials, moisture, and etc. from being introduced into the sprinkler head by sealing the sprinkler head. 
   To achieve these objects, there is provided a sprinkler head comprising: a first housing connected to a water supply pipe; a second housing coupled to the first housing; a deflector adhered to the first housing in a sealing-available manner, for spraying water all around at the time of a fire occurrence by being detached from the first housing; a locking unit locked inside the second housing for maintaining the sealing state between the deflector and the first housing; a plurality of heat collecting plates exposed to outside of the ceiling, for heat-collecting at the time of a fire occurrence; a heat responding unit having a fuse metal for releasing the locking state of the locking unit by being melted by heat collected into the heat collecting plates; and a head cover mounted at a lower side of the heat responding unit with a certain interval for covering the heat responding unit not to expose to outside and heat-collecting at the time of a fire occurrence and thereby transmitting the heat to the heat responding unit. 
   The head cover of the sprinkler head includes: a disc for heat-collecting; a heat transmission plate attached to the center of an upper surface of the disc, for transmitting heat collected by the disc to the heat responding unit; and a couple member formed at an upper surface of the heat transmission plate and coupled to the heat responding unit. 
   The disc of the head cover has a diameter larger than diameters of the plurality of heat collecting plates, is provided with a flange portion protruded upwardly at the outer edge thereof, and is provided with a plurality of ribs formed with a certain interval in a circumferential direction thereof. 
   A certain interval is formed between an upper surface of the flange portion of the disc of the head cover and the ceiling surface in order to introduce heated air into the heat collecting plates. 
   The heat transmission plate of the head cover is mounted between the heat collecting plates and the disc and has a certain thickness for maintaining a certain clearance therebetween. 
   The sprinkler head further comprises a cover member coupled to an outer circumferential surface of the second housing and adhered to the ceiling surface, for covering an opening of the ceiling. 
   The sprinkler head further comprises a hole cover mounted at the outer circumferential surface of the second housing, for covering a tool insertion hole formed at the second housing. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a sectional view of a sprinkler head in accordance with the conventional art; 
       FIGS. 2 and 3  are disassembled perspective views of a sprinkler head according to one embodiment of the present invention; 
       FIG. 4  is an engagement sectional view of the sprinkler head according to one embodiment of the present invention; 
       FIG. 5  is a perspective view of a head cover according to one embodiment of the present invention; 
       FIG. 6  is a perspective view of a head cover according to another embodiment of the present invention; 
       FIG. 7  is a sectional view of a sprinkler head to which the head cover according to another embodiment of the present invention is mounted; 
       FIG. 8  is a perspective view of a cover member according to one embodiment of the present invention; 
       FIG. 9  is a perspective view of a cover member according to another embodiment of the present invention; 
       FIGS. 10 ,  11 , and  12  are operation state views of a sprinkler head according to the present invention; 
       FIG. 13  is a disassembled perspective view of a sprinkler head according to another embodiment of the present invention; 
       FIG. 14  is a disassembled sectional view of the sprinkler head according to another embodiment of the present invention; 
       FIG. 15  is an engagement sectional view of the sprinkler head according to another embodiment of the present invention; and 
       FIG. 16  is a sectional view of a sprinkler head according to still another embodiment of the present invention. 
   

   MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS 
   Hereinafter, a sprinkler head according to the present invention will be explained as follows. 
   Even if a plurality of preferred embodiments of the sprinkler head exist, the most preferred embodiment will be explained hereinafter. 
     FIGS. 2 and 3  are disassembled perspective views of a sprinkler head according to one embodiment of the present invention, and  FIG. 4  is a sectional view of the sprinkler head according to one embodiment of the present invention which is mounted to the ceiling. 
   The sprinkler head according to the present invention comprises: a first housing  2  connected to a water supply pipe  1  disposed inside a building ceiling  7 ; a second housing  4  coupled to the first housing  2  and disposed at an opening  5  formed at the ceiling  7 ; a deflector  6  disposed in the second housing  4  and adhered to the first housing  2  in a sealing-available manner, for sealing the first housing  2  in the ordinary time and spraying water all around at the time of a fire occurrence by being detached from the first housing  2 ; a locking unit  8  locked at an inner circumferential surface of the second housing  4  for supporting the deflector  6  so that the first housing  2  can be sealed; and a heat responding unit  10  exposed to outside of the ceiling  7  for sensing heat at the time of a fire occurrence and thus releasing a locking of the locking unit  8 . 
   The first housing  2  includes: a male screw portion  12  formed at the upper portion of the first housing  2  and connected to the water supply pipe  1 ; a flange portion  14  formed at the middle portion of the first housing  2  and having a female screw portion  32  at an inner circumferential surface thereof so as to be coupled to the second housing  4 ; and a water emitting portion  16  formed at a lower portion of the first housing  2  and into which the deflector  6  is ascendably and descendably inserted, for emitting water. 
   The second housing  4  is formed as a cylindrical shape, and includes a first male screw portion  34  formed at an upper outer circumferential surface thereof and connected to the female screw portion  32  of the first housing  2 ; and a second male screw portion  38  formed at a lower outer circumferential surface thereof and connected to a cover member  36  for covering the opening  5  of the ceiling  7 . Also, a tool insertion hole  62  for supporting the deflector  6  so that the deflector  6  can not be rotated but can be adhered to a lower surface of the water emitting portion  16  of the first housing  2  is formed at the middle side of the second housing  4 . 
   Also, a locking protrusion  40  for locking the deflector  6  is protruded with a certain width at an inner circumferential surface of the second housing  4  in a circumferential direction, and the locking protrusion  40  is provided with a locking groove  44  formed in a circumferential direction for locking a locking ring  42  of the locking unit  8  by an insertion. 
   A hole cover  64  for covering the tool insertion hole  62  and thereby preventing foreign materials or moisture from being introduced into the second housing  4  through the tool insertion hole  62  is mounted at the outer circumferential surface of the second housing  4 . 
   The hole cover  64  is adhered to the outer circumferential surface between the first male screw portion  34  and the second male screw portion  38  of the second housing  4 , and is formed as a ring shape for covering the tool insertion hole  62 . At an upper surface of the hole cover  64 , formed is a rib  66  curved outwardly so as to be adhered to a lower surface of the flange portion  14  of the first housing  2 . The hole cover  64  is forcibly inserted onto the outer circumferential surface of the second housing  4  thus to be adhered thereto. 
   The deflector  6  includes: a deflector ring  18  linear-movably inserted to an outer circumferential surface of the water emitting portion  16  and locked by the locking protrusion  40  of the second housing  4  when the deflector  6  is detached from the first housing  2 ; a sealing cap  22  adhered to a lower surface of the water emitting portion  16  of the first housing  2  for sealing the water emitting portion  16 ; a water spray plate  24  fixed to an outer circumferential surface of the sealing cap  22  for spraying water all around at the time of a fire occurrence; and a plurality of supporters  20  for connecting the deflector ring  18  and the water spray plate  24 . 
   A set screw  26  is formed at a lower surface of the sealing cap  22 . If the set screw  26  is loosened, the deflector  6  is ascended and thereby the sealing cap  22  is adhered to the water emitting portion  16  thus to seal the water emitting portion  16 . At this time, a tool is inserted through the tool insertion hole  62  formed at the second housing  4  thus to support the supporters  20 , thereby preventing the deflector  6  from being rotated. 
   A spring  68  is disposed between an upper surface of the deflector ring  18  of the deflector  6  and an inner side surface of the flange portion  14  of the first housing  2 , thereby providing a certain elastic force to the deflector  6  when the deflector  6  downwardly moves accordingly as the locking of the locking unit  8  is released. 
   The locking unit  8  includes: a first loading plate  50  contacting a lower surface of the sealing cap  22  of the deflector  6  and having a screw hole  48  at the center thereof; a second loading plate  52  facing the first loading plate  50 ; and a locking ring  42  disposed at the edge between the first loading plate  50  and the second loading plate  52  and locked at the locking groove  44  formed at the second housing  4  by being widened when the first loading plate  50  and the second loading plate  52  are adhered to each other. 
   The first loading plate  50  and the second loading plate  52  are respectively provided with an inclination surface at the edge of the opposing surface, and a locking ring  42  is positioned between said two inclination surfaces. According to this, if the locking screw  61  is tightened, the first loading plate  50  and the second loading plate  52  are adhered to each other and thereby the locking ring  42  is widened along the inclination surfaces thus to be locked at the locking groove  44  of the second housing  4 . 
   The locking groove  44  is formed at the inner circumferential surface of the second housing  4  with a certain height from a lower surface of the second housing  4 . According to this, the locking ring  42  locked at the locking groove  44  and the first and second loading plates  50  and  52  are disposed with a state of being inserted to the inner surface of the second housing  4 . 
   The heat responding unit  10  includes: a plurality of heat collecting plates  54 ,  56 , and  58  mounted at a lower side of the second loading plate  52  for collecting heat at the time of a fire occurrence; a fuse metal  60  disposed at a lower surface of the heat collecting plates  54 ,  56 , and  58  and melted when heat collected through the heat collecting plates  54 ,  56 , and  58  reaches a certain temperature; a locking screw  61  coupled to the screw hole  48  formed at the first loading plate  50  for integrally coupling the first and second loading plates  50  and  52 , the heat collecting plates  54 ,  56 , and  58 , and the fuse metal  60 ; and a head cover  70  mounted at a lower side of the heat collecting plate  58  with a certain interval for covering the heat collecting plates not to expose to outside and heat-collecting at the time of a fire occurrence. 
   Centers of the heat collecting plates  54 ,  56 , and  58  are penetrated so that the locking screw  61  can pass. The first heat collecting plate  54  is disposed at a lower surface of the second loading plate  52  with a certain interval with the second loading plate  52 , and the second heat collecting plate  56  is disposed with a certain interval with the first heat collecting plate  54 . Also, the third heat collecting plate  58  is disposed with a certain interval with the second heat collecting plate  56  and is provided with the fuse metal  60  at the lower surface thereof. An insulating washer  55  is mounted between the second loading plate  52  and the first heat collecting plate  54 , thereby preventing heat collected into the first heat collecting plate  54  from being transmitted to the second loading plate  52 . 
   The first, second, and third heat collecting plates  54 ,  56 , and  58  have the same diameter, and are disposed with a certain interval one another so that heated air can pass. 
   The locking screw  61  is provided with a penetration hole  71  for passing a tool such as a wrench, and the penetration hole  71  is provided with a screw groove  73  to which the head cover  70  is coupled. 
     FIG. 5  is a perspective view of a head cover according to one embodiment of the present invention. 
   The head cover  70  includes: a disc  74  formed as a disc shape for heat-collecting; a heat transmission plate  75  attached to the center of an upper surface of the disc  74 , for transmitting heat collected by the disc  74  to the fuse metal  60 ; and a couple member  76  upwardly protruded from an upper surface of the heat transmission plate  75  and coupled to the screw groove  73  of the locking screw  61 . 
   The disc  74  has a diameter larger than diameters of the first, second, and third heat collecting plates  54 ,  56 , and  58 , and is provided with a flange portion  77  upwardly protruded with a certain with from the outer edge thereof. A plurality of ribs  78  are formed at a circumference of the disc  74  with a certain interval thus to strengthen an intensity of the disc  74 , thereby preventing the disc  74  from being deformed. 
   It is preferable that the thickness of the disc  74  is 0.2mm˜0.5mm and the outer diameter thereof is 40mm˜100mm. It is preferable that the height of the flange portion  77  is 2mm˜4mm. 
   The heat transmission plate  75  is formed of a material that can easily transmit heat, and is in contact with the lower surface of the locking screw  61  thus to transmit heat to the fuse metal  60 . Also, the heat transmission plate  75  has a certain thickness thus to maintain a certain clearance C between the third heat collecting plate  58  and the disc  74 . 
   It is preferable that a diameter of the heat transmission plate  75  is formed to be smaller than a diameter of a head portion of the locking screw  61 . 
   Since the head cover  70  and the ceiling  7  maintain a certain interval D, heated air is introduced into the interval thus to be transmitted to the first, second, and third heat collecting plates  54 ,  56 , and  58 . 
   It is preferable that the couple member  76  is composed of a screw bar coupled to the screw groove  73  of the locking screw  61 . 
     FIG. 6  is a perspective view of a head cover according to another embodiment of the present invention, and  FIG. 7  is a sectional view of a sprinkler head to which the head cover according to another embodiment of the present invention is mounted. 
   A head cover  80  according to another embodiment of the present invention includes: a disc  74  formed as a disc shape for heat-collecting; a heat transmission plate  75  attached to the center of an upper surface of the disc  74 , for transmitting heat collected by the disc  74  to the fuse metal  60 ; and a locking hook  81  disposed at an upper surface of the disc  74  in a circumferential direction with a certain interval thus to be locked at the first heat collecting plate  54 . 
   The disc  74  and the heat transmission plate  75  have the same structures as those of the first embodiment. The locking hook  81  is attached to the upper surface of the disc  74  in the circumferential direction thus to be extended perpendicularly, and the end portion of the locking hook  81  is provided with a locking protrusion  82  curved inwardly thus to be locked at the upper surface of the first heat collecting plate  54 . 
   An assembly structure of the head cover according to the second embodiment will be explained. First, when the head cover  80  is inserted into the locking unit  10  from a lower direction to an upper direction, the locking protrusion  82  of the locking hook  81  is locked at the upper surface of the first heat collecting plate  54  and thereby the head cover  80  maintains a fixed state. At this time, the heat transmission plate  75  is in contact with the lower surface of the locking screw  61 . 
     FIG. 8  is a perspective view of a cover member according to one embodiment of the present invention. 
   A cover member  36  according to the first embodiment includes: a plate portion  84  formed as a disc shape and adhered to an outer side surface of the ceiling  7 ; and a couple portion  85  protruded from an upper side surface of the plate portion  84  thus to be coupled to the second male screw portion  30  of the second housing  4 . The couple portion  85  is protruded with a certain with as a cylindrical shape, and is provided with a female screw portion  86  coupled to the second male screw portion  30  at the inner circumferential surface thereof. 
   The cover member  36  covers the opening  5  of the ceiling  7  since the plate portion  84  is adhered to the outer side surface o the ceiling  7  and the couple portion  85  is coupled to the second housing  4 , thereby preventing peripheral heat of the sprinkler head from being leaked out through the opening  5  at the time of a fire occurrence and thereby enhancing a responsiveness of the sprinkler head. 
     FIG. 9  is a perspective view of a cover member according to another embodiment of the present invention. 
   A cover member  88  according to another embodiment of the present invention is composed of: a plate portion  84  of which the center is formed as an open disc shape and adhered to the ceiling  4 ; and a plurality of supporting ribs  89  formed at an upper surface of the plate portion  84  in a circumferential direction with a certain interval and provided with a plurality of protrusions  90  locked at the second male screw portion  30  of the second housing  4  at the inner surface thereof. 
   An assembly process of the sprinkler head according to the present invention will be explained as follows. 
   First, the deflector  6  is inserted onto the outer circumferential surface of the water emitting portion  16  of the first housing  2 , thereby adhering the sealing cap  22  of the deflector  6  to the lower surface of the water emitting portion  16 . 
   Then, the first loading plate  50 , the locking ring  42 , and the second loading plate  52  are sequentially disposed from the lower side of the second housing  4  to the inner side thereof. Then, the plurality of heat collecting plates  54 ,  56 , and  58  and the fuse metal  60  are positioned at the lower side of the second loading plate  52 , and the locking screw  61  is coupled to the screw hole  48  of the first loading plate  50 . Then, a proper torque is applied to the locking screw  61 , so that the first loading plate  50  and the second loading plate  52  are adhered to each other. According to this, the locking ring  42  is widened along the inclination surfaces of the first loading plate  50  and the second loading plate  52 , thereby being inserted into the locking groove  44  formed at the second housing  4 . 
   The locking unit  8  and the heat responding unit  10  are coupled to the second housing  4 , and then the first male screw portion  34  of the second housing  4  is coupled to the female screw portion  32  formed at the flange portion  14  of the first housing  2 . According to this, the set screw  26  coupled to the deflector  6  is in contact with the upper surface of the first loading plate  50 . 
   Under this state, a tool is inserted through the tool insertion hole  90  formed at the second housing  4  thereby to support the supporter  20  of the deflector  6  so that the deflector  6  can not be rotated. Then, the tool is inserted into the penetration hole  96  formed at the locking screw  61  thus to loosen the set screw  26 . At this time, since the set screw  26  is in a state of being supported at the first loading plate  50 , the deflector  6  is relatively ascended and the sealing cap  22  is adhered to the lower surface of the water emitting portion  16  of the first housing  2  thereby to seal the water emitting portion  16 . 
   When the sealing operation of the water emitting portion  16  is completed, the hole cover  92  is forcibly inserted onto the outer circumferential surface of the second housing  4  thereby to seal the tool insertion hole  90  formed at the second housing  4 . 
   Then, the couple portion of the head cover is coupled to the locking screw  61  thereby to complete the assembly. 
   Operation of the sprinkler head according to the present invention will be explained as follows. 
     FIGS. 10 ,  11 , and  12  are operation state views of the sprinkler head according to the present invention. 
   As shown in  FIG. 10 , under a state that the sprinkler head is mounted at the ceiling  60 , air heated at the time of a fire occurrence rises thus to be collected into the head cover  70  and at the same time to be collected into the heat collecting plates  54 ,  56 , and  58  through the space between the head cover  70  and the ceiling  7 . 
   The heat collected into the head cover  70  is transmitted to the fuse metal  60  through the heat transmission plate  75 , and the heat collected into the heat collecting plates  54 ,  56 , and  58  is transmitted to the fuse metal  60 , thereby fast melting the fuse metal  60 . 
   Then, as shown in  FIG. 11 , the interval between the first loading plate  50  and the second loading plate  52  is widened, so that the locking ring  42  restores to the original state thereby to be separated from the locking groove  44 . According to this, the locking unit  8  and the heat responding unit  10  are separated from the second housing. 
   Next, as shown in  FIG. 12 , after the deflector  6  is separated from the first housing  2 , the deflector  6  is locked at the locking protrusion  40  formed at the second housing  2 . According to this, water drained through the second housing  4  spreads through the water spray plate  24  thus to extinguish fire. 
     FIG. 13  is a disassembled perspective view of a sprinkler head according to another embodiment of the present invention,  FIG. 14  is a disassembled sectional view of the sprinkler head according to another embodiment of the present invention, and  FIG. 15  is an engagement sectional view of the sprinkler head according to another embodiment of the present invention. 
   The sprinkler head according to another embodiment has the same structure as the sprinkler head according to the first embodiment except a structure for supporting the deflector  6  not to be rotated when the set screw  26  coupled to the deflector  6  is loosened in order to adhere the sealing cap  18  of the deflector  6  to the lower surface of the water emitting unit  16  of the first housing  2 . 
   In the sprinkler head according to another embodiment of the present invention, a tool insertion hole  86  for inserting a tool is formed at the flange portion  14  of the first housing  2  in a vertical direction, and a supporting groove  87  to which the tool that has passed the tool insertion hole  86  is inserted for supporting the deflector  6  not to be rotated is formed at the deflector ring  18 . 
   Also, a packing member  85  is fitted into the tool insertion hole  86 , thereby preventing foreign materials, moisture, and etc. from being introduced into the sprinkler head through the tool insertion hole  86 . 
   An assembly process of the sprinkler head according to another embodiment of the present invention will be explained. First, a tool is inserted into the supporting groove  87  formed at the deflector ring  18  through the tool insertion hole  86 , and then the set screw  26  is loosened, thereby adhering the sealing cap  22  of the deflector  6  to the lower surface of the water emitting portion  16  of the first housing  2 . Then, the tool is extracted from the tool insertion hole  86 , and the packing member  85  is forcibly fitted into the tool insertion hole  86 , thereby sealing the tool insertion hole  86 . 
   According to this, foreign materials, moisture, and etc. can be prevented from being introduced into the sprinkler head through the tool insertion hole  86 . 
     FIG. 16  is a sectional view of a sprinkler head according to still another embodiment of the present invention. 
   The sprinkler head of  FIG. 16  has the same structure as the first embodiment except a heat collecting plate. The sprinkler head of  FIG. 16  is provided with a heat collecting member  90  of a cup shape instead of the plurality of heat collecting plates of the first embodiment, and the head cover  70  is disposed at a lower side surface of the heat collecting member  90  with a certain interval with the heat collecting member  90 . 
   The head cover  70  is the same as the head cover aforementioned in the first embodiment, thereby omitting its explanation. 
   In the sprinkler head according to the present invention, the head cover is installed at the lower side of the heat responding unit, thereby preventing the heat responding unit and the opening of the ceiling from being exposed to outside and thereby having a fine appearance. Also, the head cover is disposed with a certain interval with the ceiling, so that the head cover collects heat at the time of a fire occurrence and at the same time heated air is introduced into the heat responding unit. According to this, a reaction speed is quickened and thereby a reliability of the product can be enhanced. 
   Additionally, foreign materials, moisture, and etc. are prevented from being introduced into the sprinkler head by packing the tool insertion hole formed at the first housing or the second housing, thereby preventing a mis-operation of the sprinkler head. 
   It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.