Abstract:
Water flow through a sprinkler is controlled by a valve assembly that includes a spring-biased slide shaft disposed within a valve tube and controlled by the pivotal movement of a trigger to permit accurate control of water dispensed through a barrel body by varying the separation between a stop flange of the slide shaft and a water inlet of the valve tube.

Description:
BACKGROUND OF THE INVENTION 
     The present invention is related to a sprinkler structure having less components which can be easily and quickly assembled. The controlling valve assembly can be tightly and precisely fitted in the controlling valve seat without leakage. The amount of the water discharged from the sprinkler can be micro-adjusted as necessary. 
     FIG. 1 shows a conventional sprinkler. The controlling valve assembly is arranged in the tubular barrel body  1  of the sprinkler. A thread rod  2  rearward extends from the barrel body  1 . A controlling trigger  4  is pivotally connected with back side of the tubular handle  3 . The top end of the controlling trigger  4  via a nut  5  chucks the thread rod  2 . In operation, a user&#39;s hand holds the controlling trigger  4  and the handle  3  and presses the trigger  4  to drive the thread rod  2  for operating the controlling valve assembly inside the barrel body  1 . 
     The above conventional sprinkler structure has some shortcomings as follows: 
     1. In operation, the thumb of the user presses the trigger  4  to open or close the sprinkler. Such operation is not easy to perform. 
     2. When it is necessary to adjust the amount of the sprinkled water, the user needs to adjust the nut  5  at the top of the trigger  4 . It is inconvenient for the user to perform such adjustment. 
     FIG. 2 shows another conventional sprinkler. The barrel body  11  and the handle  12  communicate with each other. The barrel body  11  and the handle  12  are integrally coated with a plastic layer to form the sprinkler main body  10 . The front end of the barrel body  11  is formed with a thread section  13  for connecting with a sprinkling head  14 . The rear end of the handle  12  is formed with inner thread  15  for connecting with a water hose. A controlling valve tube seat  20  is disposed in upper section of the handle  12  and positioned at an adjoining section between the handle  12  and the barrel body  11 . The inner end of the valve tube seat  21  integrally communicates with the barrel body  11  and the handle  12 . The inner face of outer end of the valve tube seat  21  is formed with symmetrical locating dents  22 . A spring  35  and a cylindrical valve tube member  23  are fitted in the valve tube seat  21 . The valve tube member  23  is formed with protuberances  24  corresponding to the locating dents  22  of the valve tube seat  21 . The valve tube member  23  is inserted in the valve tube seat  21 . One side of the inner end of the valve tube member  23  is formed with a through hole  26  facing the barrel body  11 . The other side thereof is formed with a notch  25  facing the handle  12 . The notch  25  is deflected from the through hole  26  by a certain distance. The slide shaft hole  27  in the valve tube member  23  within the deflection distance between the notch  25  and the through hole  26  is enlarged to form an annular step  28 . The circumferential face of the valve tube body  23  opposite to the inner side of the protuberances  24  and the deflection distance between the notch  25  and the through hole  26  is respectively formed with an annular groove  29  in which a water-sealing ring  30  is fitted to slidably watertight attach to the valve tube seat  21 . A slide shaft  31  is passed through the slide shaft hole  27  of the valve tube member  23 . The front end thereof protrudes from the valve tube member  23 . The circumference of the rear end of the slide shaft  31  is formed with an annular stop flange  32 . The slide shaft  31  is formed with an annular groove  29  on front side of the stop flange  32  in which a water-sealing washer  33  is fitted for watertight attaching to the annular step  28  of the slide shaft hole  27 . The middle section of the slide shaft  31  is formed with an annular neck groove  34  with a width bridging over the notch  25  and the through hole  26  of the valve tube member  23 . The front section of the slide shaft  31  is formed with an annular groove  29  in which a water-sealing ring  30  is fitted for slidably watertight attaching to the inner wall face of the slide shaft hole  27 . 
     The above conventional structure has some shortcomings as follows: 
     1. The sprinkler has numerous components and it is troublesome to assemble these components. 
     2. In the case of little error of the dimension of the components, the assembly of the components will have poor watertight effect. As a result, when operating the sprinkler, water will leak therefrom. 
     SUMMARY OF THE INVENTION 
     It is therefore a primary object of the present invention to provide an improved sprinkler structure having less components which can be easily and quickly assembled. 
     It is a further object of the present invention to provide the above sprinkler in which the components can be assembled at high precision without leakage. 
     It is still a further object of the present invention to provide the above sprinkler which can be maintained in a state of maximum water flow or a water-sealing state. In addition, the amount of the discharged water can be micro-adjusted as necessary. Therefore, the sprinkler can be conveniently operated. 
     The present invention can be best understood through the following description and accompanying drawings wherein: 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side view of a conventional sprinkler; 
     FIG. 2 is a perspective exploded view of another type of conventional sprinkler; 
     FIG. 3 is a perspective assembled view of the present invention; 
     FIG. 4 is a sectional assembled view of the present invention; and 
     FIG. 5 is a sectional assembled view according to FIG. 4, showing the operation of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Please refer to FIG.  3 . The sprinkler structure of the present invention includes a main body  40 , a controlling valve assembly  50  and a trigger  60 . The main body  40  is integrally coated with a plastic layer. A controlling valve seat  43  is disposed at the adjoining section between the upper section of the handle  42  and the barrel body  41 . The controlling valve seat  43  is formed with a stepped hole  431 . The upper side of the stepped hole  431  is formed with a water outlet  433  under the barrel body  41 . The upper side of the handle  42  is formed with a water inlet  434 . The top end of the controlling valve seat  43  is provided with a locating section  432  for receiving the controlling valve assembly  50  therein. A locating seat  45  downward extends from the middle of the barrel body  41 . One end  511  of a conic spring  51  of the controlling valve assembly  50  abuts against the locating section  432 . The stop flange  521  of the slide shaft  52  is fitted with a washer  522  to abut against the water inlet  531  of the controlling valve tube  53 . The slide shaft  52  is fitted into a washer  54  and then one end  523  of the slide shaft  52  abuts against the other end  511  of the conic spring  51 . The other end  523  of the slide shaft  52  is passed through the stepped through hole  533  of the controlling valve tube  53 . The controlling valve tube  53  is formed with a semicircular water outlet  532  behind the water inlet  531 . The water outlet  532  is upward aimed at the water outlet  433  in the controlling valve seat  43  and then inward pressed and tightly engaged therewith. Then, a small washer  535  is fitted and located in the large diameter section  534  of the stepped through hole  533 . Then, two washers  55  are fitted therein. The other end  523  of the slide shaft  52  abuts against the press plate  62  in the trigger  60 . The through hole  61  of the trigger  60  is aligned with the locating seat  45  of the main body  40  and pivotally connected therewith by a rivet  63 . 
     Referring to FIG. 5, when controlling and using the sprinkler, the trigger  60  is pressed toward the handle  42  of the main body  40  to make the press plate  62  of the trigger  60  abut against one end  523  of the slide shaft  52 . The stop flange  521  of the slide shaft  52  is separated from the water inlet  531  of the controlling valve tube  53 . At this time, the water can flow through the water inlet  434  of the handle  42  into the controlling valve seat  43 . The water passes through the water inlet  531  of the controlling valve tube  53  and discharges from the water outlet  532  of the controlling valve tube  53 . The water then passes through the stepped hole  431  and injects from the water outlet  433  of the barrel body  41 . By means of controlling the depth by which the trigger  60  is pressed toward the handle  42 , the amount of the discharged water can be controlled. When the slide shaft  52  is pressed by the trigger  60 , the distance between the stop flange  521  and the water inlet  531  of the controlling valve tube  53  is variable to change the amount of the discharged water. Such operation is easy. 
     According to the above arrangement, the present invention has the following advantages: 
     1. The sprinkler has less components which can be easily and quickly assembled. 
     2. The components can be assembled at high precision without leakage. 
     3. The sprinkler can be maintained in a state of maximum water flow or a water-sealing state. In addition, the amount of the discharged water can be micro-adjusted as necessary. Therefore, the sprinkler can be conveniently operated. 
     The above embodiment is only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiment can be made without departing from the spirit of the present invention.