Abstract:
A concealed fire sprinkler includes a main body, an arm extending along the main body and a receiving slot formed on the arm. A bottom cover is fixed by the arm at bottom of the main body. An elastic component is received in the receiving slot. Two ends of the elastic component contact with the arm and the bottom cover. Accordingly, the conventional problems that the temperature sensing speed of concealed fire sprinklers is not capable of increasing rapidly can be solved.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a concealed fire sprinkler structural technique, particularly to a sprinkling body of a concealed fire sprinkler. 
     2. Description of Related Art 
     The conventional fire sprinklers are substantially divided into concealed-type, semi-concealed-type and open-type fire sprinklers. For the concealed-type fire sprinklers, the sprinkling head and its connected pipes are concealed in the ceiling in order to show the sprinkling body. 
     Conventional sprinkling body of the fire sprinkler comprises a main body and a bottom cover. The main body is disposed on the fire sprinkling head through the main body to fix the bottom cover to a lower part of the main body and to avoid direct exposing of sprinkling head from the surface of the ceiling so as to increase beauty of the whole ceiling. In the implementation of one embodiment of prior arts, the bottom cover is fixed to a lower part of the main body by adherence by using a low temperature melting metal (for example, Tin). When fire generates high temperature air to melt the low temperature melting metal, the bottom cover drops from the main body. Thus, hot air enters into the main body to cause a temperature sensing glass rod in sprinkling head to be cracked down and the water passage of the fire sprinkler pipe is opened to spray water. 
     Moreover, in the process of hot melting of the low temperature melting metal, an adhereing force of the bottom cover to fix to the main body bottom is decreased, the bottom cover will not drop from the lower part of the main body until the adhereing force is smaller than the dropping force of the bottom cover so as to let the hot air enter into the main body and to crack down the temperature sensing glass rod by heating. Thus, the sprinkling pipes are opened to spay water in order to decrease the damages of fire incident. But, how to increase the speed to drop the bottom cover from the lower part of the main body will be a technology subject to be studied and overcome. 
     SUMMARY OF THE INVENTION 
     The objective of the present invention is to improve the speed to drop the bottom cover from the lower part of the main body for a conventional concealed fire sprinkler under the hard condition that a temperature sensing speed of the temperature sensing glass rod is difficult to change. In order to achieve the objective, this invention provides a concealed fire sprinkler comprising: 
     a main body having an arm extending from it, the arm having a receiving slot; 
     a bottom cover fixed to a lower part of the arm through the arm; and 
     an elastic component received in the receiving slot, two ends of the elastic component being respectively contacted with the arm and the bottom cover. 
     In one preferred embodiment of the present invention, a preferably manifold sheet is formed and extending from one end of the arm, a bonding element is formed at a lower side of the manifold sheet and the receiving slot is formed between the manifold sheet and the bonding element. 
     According to the present invention, preferably two ends of the elastic element respectively contact with the manifold sheet and the bottom cover. 
     According to the present invention, preferably the elastic element is a spring sheet in V-shape. A bending portion is preferably formed between the two ends of the elastic element and the bending portion is received in the receiving slot so as to respectively contact the two ends with the arm and the bottom cover. 
     According to the above techniques of this invention, the advantages of the present invention are that the dropping force of the bottom cover by means of the elastic component located between the main body and the bottom cover is increased by using a pushing force of the elastic component in addition to the effects of the dropping force of the bottom cover weight, and that the speed to drop the bottom cover from the lower part of the main body is increased when the low temperature melting metal melts down to cause the adhering force to bond the bottom cover to decrease. The sprinkling pipes are opened to extinguish the fire. The convenience to assemble the elastic component between the main body and the bottom cover is increased through the V-shaped structure of the elastic component. 
     Other objectives, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a three-dimensional explosive view of a concealed fire sprinkler of the present invention. 
         FIG. 2  is a top view showing the concealed fire sprinkler of  FIG. 1  of the present invention. 
         FIG. 3  is a cross-section view along a line A-A of  FIG. 2 . 
         FIG. 4  is a partially enlarged view showing the concealed fire sprinkler of  FIG. 3  of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Please refer to  FIGS. 1 to 3  which respectively disclose a preferred embodiment of the present invention. The disclosed concealed fire sprinkler in the present invention comprises a main body  20 , a bottom cover  30  and an elastic component  40 . 
     The main body  20  is mounted on the sprinkler  20 . In more details, a sprinkling head comprises a valve seat  10 . A screw component  16  is formed on a top end of the valve seat  10 . The valve seat  10  can be mounted on a fire pipe  50  by the screw component  16 . A passage  17  is formed in the valve sear  10 . At two ends of passage  17 , a water inlet  171  and a valve hole  172  are respectively formed on a surface of the valve seat  10 . The passage  17  is fluidly connected to the fire pipe  50  through water inlet  171  so that the water in the fire pipe  50  can transfer from the passage  17  to the valve hole  172  via the water inlet  171  to drain out. In one embodiment, a water valve  11  is disposed at the valve seat  10 . The water valve  11  can control a draining timing of the water in the fire pipe  50 . A temperature sensing glass rod  12  is disposed under the bottom of the water valve  11 . The temperature sensing glass rod  12  normally pushes upwardly to hold the water valve  11  to turn off the valve hole  172  to prevent the water in the fire pipe  50  from leakage to the outside. 
     Two ribs  13  are respectively formed at opposite axial sides of the passage at two ends of the valve seat  10 . The rib  13  is used for holding and positioning the temperature sensing glass rod  12  to maintain in the valve seat  10 . A guiding rod  14  which can move and slide in an axial direction of passage  17  is formed at a bottom side of the rib  13 . A disk-shaped spoiler  15  which can form a water curtain from the water drained from the valve hole  172  by the spoiler  15  is connected to the guiding rod  14  in order to enhance a spraying area of the water. 
     In one embodiment, the main body  20  is held and maintained at the ribs  13  at two sides of the valve seat  10 . In more details, a ring-shaped neck  21  is formed at a top side of the main body  20 . An assembling slot  211  is formed in an asymmetric way at the neck  21 . An inner diameter of the neck  21  is smaller than an outer diameter of the valve seat  10  and an inner diameter between two assembling slots  211  is larger than the outer diameter of the valve seat  10  in order to restrict an assembling way of the valve seat  10  and the main body  20  for facilitating mounting of the main body  20  on the fastened ribs  13  at two sides of the valve seat  10 . 
     In one embodiment, an arm  22  is formed and extending along a wall of the main body  20  at an outside of the assembling slot  211 . Because the arm  22  in this invention is used for guiding movement of the main body  20  along an axial direction of the valve seat  10 , the amount of the arms  22  should be larger or equal to the amount of the ribs  144 . In this embodiment, the amount of the arms  22  is two. Furthermore, a guiding sheet  221  is respectively formed by folding the guiding sheet  221  at two sides of the arms  22 . The main body  20  can move along a formed guiding slot in a limited axial direction of the valve seat  10  through the guiding sheets  221 . A plurality of elastic hooks  222  are formed on the arms  22  between two guiding sheets  221 . The elastic hooks  22  are made by punching an outer wall of the arm  22  in one embodiment. One end of the elastic hook  222  is bending inwardly and the elastic hook  222  is formed in an array on the arm  22 . A plurality of fastening slots  131  are formed at equal distance on the rib  13 . The fastening slot  131  is in tooth-shaped in implementation. The elastic hook  222  can be fastened by being hooked to the fastening slot  131  for facilitating regulating a level of the fastening position of the main body  20  on the valve seat  10 . 
     A manifold sheet  23  is formed and extending in a horizontal direction of the arm  22 . A bonding element  231  is formed at bottom of the manifold sheet  23 . The bonding element  231  is made by punching a sheet of the manifold sheet  23 . The bonding element  231  is in L-shape. A receiving slot  24  is formed between the bonding element  231  and the manifold sheet  23 . 
     In one embodiment, the bottom cover  30  is fixed to the bottom of the main body  20 . In more details, the bottom cover  30  is adhered and fixed to bonding element  231  at bottom of the main body  20  by using a low temperature melting metal (for example, tin) for adhering. When high temperature of the hot air of a fire causes the low temperature melting metal to melt down so as to drop the bottom cover  30  from the main body  20 , the hot air contacts with the temperature sensing glass rod  12  to be cracked down in order to open the water valve  11  to spray water. 
     Please refer to  FIGS. 3 and 4  which demonstrate that the elastic component  40  is disposed between the main body  20  and the bottom cover  30 . Two ends of the elastic component  40  respectively contact with the main body  20  and the bottom cover  30 . In one embodiment, the elastic component  40  is a V-shaped elastic sheet. In implementation, the two ends of the elastic component  40  respectively are a first terminal  41  and a second terminal  42 . A bending portion  43  is formed between the first terminal  41  and the second terminal  42  of the elastic component  40  to show that the appearance of the elastic component  40  is of V-shape. 
     When the elastic component  40  is assembled between the main body  20  and the bottom cover  30 , the elastic component  40  is implanted into the receiving slot  24  by firstly inserting the bending portion  43 , secondly the first terminal  41  and thirdly the second terminal  42 . Thus, the elastic component  40  is continuously pressed so that the first terminal  41  mutually approaches the second terminal  42  of the elastic component  40  by confining of the receiving slot  24 . Thus, the second terminal  42  of the elastic component  40  leaves the bottom cover  30  to avoid retarding assemble of the bottom cover  30  on bottom of the main body  20  and to increase convenience of assemble of the elastic component  40 . When the bottom cover  30  is fixed to the bottom of the main body  20  by using the low temperature melting metal, pressing toward the elastic component  40  is terminated so that the first terminal  41  leaves away the second terminal  42  from each other through spring pressure of the elastic component  40 . Then, the first terminal  41  of the elastic component  40  contacts the manifold sheet  23  and the second terminal  42  contacts the bottom cover  30 . A dropping force of the bottom cover  30  increases after the spring pressure of the elastic component  40  pushes the bottom cover  30 . When hot air melts down the low temperature melting metal to decrease the adhering force of the bottom cover  30 , the bottom cover  30  can fast drop from the bottom of the main body  20  for facilitating turning on the water valve  11  to spray water. 
     Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that any other possible modifications and variations can be made without departing from the scope of the invention as hereinafter claimed.