Abstract:
An automatic sprinkler head is disclosed for the discharge of water for extinguishing a fire in which the delivery of water through the head is controlled by a fusible element, but with improved provisions for preventing fluid leakage.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation-in-part of my prior application for Automatic Sprinkler Head, filed Nov. 10, 1982, Ser. No. 440,539. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a flush pendant or flush horizontal sidewall automatic sprinkler head. 
     2. Description of the Prior Art 
     Various automatic spinklers have heretofore been disclosed which are responsive to a fusible element, but none of these has proven wholly satisfactory. 
     SUMMARY OF THE INVENTION 
     An automatic sprinkler head is provided in which the discharge of the water to and through the head is controlled by a fusible element. 
     It is the principal object of the invention to provide an automatic sprinkler head which is responsive to a fusible element. 
     It is a further object of the invention to provide an automatic sprinkler head in which a better flow of liquid is attained when the sprinkler is in 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 hereof, in which: 
     FIG. 1 is a vertical sectional view showing an automatic sprinkler in accordance with the invention in its normal position; 
     FIG. 2 is a vertical sectional view of an automatic sprinkler head in accordance with the invention in the discharge position; 
     FIG. 3 is a horizontal sectional view taken approximately on the line 3--3 of FIG. 1; and 
     FIG. 4 is a horizontal plan view as seen from below. 
    
    
     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. 
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring now more particularly to the drawings, the sprinkler head 10, in accordance with the invention, has a body portion 10a provided with a threaded portion 11 for attachment to a supply line (not shown). A plate 12 is provided having a plurality of slotted openings 13. An outer housing 14 is provided having a threaded portion 15. A hole 17 is provided in the ceiling 18. 
     A cover 19 is provided for the ceiling opening 17 which includes a tubular portion 20 with an inwardly extending flange 22 for engagement with the threaded portion 15, and an outwardly extending flange 23 and a rib 24 for engagement with the ceiling 18. 
     In covering relation to the outer housing 14, a plate 25 is provided. 
     Within the housing 14, a plurality of downwardly extending rods 26 are provided having washers 27 secured thereto, the rods 26 being secured at their lower ends to the plate 12. The rods 26 extend through openings 28 in the flange 29 which is integral with the body portion 10a. 
     The body portion 10a is an interiorly tapered portion 30 in communication with an interior cylindrical portion 32, and within the interior of the body portion 10a, a valve plug 33 is provided having a packing ring 34 in a groove 35. 
     The packing ring 34 has extending over the valve plug 33 a covering portion 36 to enhance the seal. The valve plug 33 has a downwardly extending internally threaded rim 37 with which also the cylindrical recess 38 is engaged. The lower part of the cylindrical portion 10a has a groove 39 for the reception of a plurality of locking balls 40. 
     The plate 12 is engaged with the downwardly extending internally threaded rim 37. Externally threaded sleeve 41 is in threaded engagement with the downwardly extending internally threaded rim 37. 
     A plunger 42 is provided and has a central portion 42a with a tapered section 43 for retaining the balls 40 in the groove 39. 
     The plunger 42 has a lower portion 44 slidable within a cylindrical portion 46 of the housing 45, which is separated from the sleeve 41 by an insulating ring 47. 
     The housing 45 contains within its cylindrical portion 46 an insulating disc 48, and a fusible element 49. The lower portion 44 of the plunger 42 rests on top of the insulating disc 48, which rests on top of the fusible element 49. It should be mentioned also that the housing 45 carries one or more cylindrical heat collecting fins 50. 
     As shown in FIG. 2, upon melting of the fusible element 49, the plunger 42 drops and permits the balls 40 to move from the groove 39 and inwardly with respect to the plunger 42 and the valve plug 33, so that the valve plug 33 and plunger 42 move downwardly together with the plate 12, and the rods 26.