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FIELD OF THE INVENTION 
       [0001]    The present invention relates to dropping heads, and in particular to a dropping head for a wash basin or a bathtub. 
       BACKGROUND OF THE INVENTION 
       [0002]    Conventionally, there are three kinds of dropping head, which are separable water-blocking plugs, linking rod controlled dropping heads, and push-controlled dropping heads. The first one has the defect of easy lose because positioning of the plug is uncontrollable and the plug easily deformed due to heat so as to reduce the size thereof, as a result water drains out. Moreover, the prior art water blocking plug is locked by a chain which is deformable and has an unbeautiful outlook. Even it is easy to twist with a shower nozzle. For the second kind of dropping head, it requires to install another cover and a control button. The cost is high and the repair and maintenance works are increased dramatically. Furthermore, a rotating button for control opening and closing must be installed at an inner side or upper edge of a bathtub causing outlook of the bathtub is not beautiful. Thus this kind of dropping head is only used in large scale bathtub or massage bathtub. It is seldom to be used in small size bathtub. The third dropping head is a resilient one, which is popular recently. Basically, it contains a metal cover, a resilient pressible set and a seat which are assembled as an integral body for being installed to a bathtub. In use, a cover at the top can be opened or closed easily by using fingers or toes to press the cover repeatedly so as to have the functions of water storage or drainage. When hairs or dirt need to be removed, the seat can be opened for cleaning. 
         [0003]      FIG. 4  shows one prior art dropping heads, in that a dropping head includes a body  5  and a movable cover set  6 . The body  5  is a tube-like body. A top of the body  5  is formed with a flange  50 . A middle section of the body  5  is formed with at least one hole. A bottom of the body  5  is installed with a locking unit  52 . The locking unit  52  has an inner thread  530 . The cover set  6  is engaged to the body  5 . The cover set  6  includes a cover  6  and a pressible tube  61 . An outer wall of the lower portion of the tube  61  is formed with outer thread  642  for engaging with the inner thread  530  so that the cover  6  is locked to the body  5 . When the dropping head is installed to a bathtub or a wash basin, the cover set  6  is pressed so that the cover  60  will seal an upper opening of the body  5 , causing no water to drain out. When the cover set  6  is repressed, water in the basin can drain out from the hole of the body and gaps at the bottom of the locking unit  52 . 
         [0004]    When above mentioned structure is used for a long time, a part of water flowing through gaps aside the locking unit  52  is obstructed so that hairs and dirt will accumulate gradually. As a result, water flow becomes smaller and smaller, even no water can drain out. At this moment, it is required to screw the cover  60  counterclockwise to release from active tube for cleaning interior of the dropping head. Even when the draining path is blocked completely, the active pipe  61  must be released from the body for cleaning completely. However, in the original design, the cover, active pipe and body are normally locked to each other. The releasing operations are affected by the original tighten forces. If the force is too great, it is difficult to release one from another, even another tool is needed, but this is not in the original design scope. Furthermore, repeated screwing and de-screwing operations will destroy or deform the threads so as to affect the whole structure of the dropping head. 
         [0005]    Above mentioned prior art structure is not designed with any filter. As a result, hairs or other dirt will flow with draining water to enter into water drain pipe so as to block the pipes, or have undesired smell. From the viewpoint of environment protection, it is helpful if the hair or dirt can be filtered at the input end to cause they are not enter into the proceeding pipes. 
       SUMMARY OF THE INVENTION 
       [0006]    To improve above mentioned prior art defects, the present invention provides a dropping head for a wash basin or a bath basin, in that a base of a dropping head is installed with an upper filter disk and a lower filter disk for filtering hairs and dirt. The upper filter disk and lower filter disk are detachable for cleaning or updating. Cleaning grains can be placed between the upper filter disk and the lower filter disk. Cleaning material in the cleaning grains is released with draining water so as to have the function of odor-proof and cleanness of the pipes. Furthermore, in the present invention, the resilient press unit is engaged with the base of the dropping head along a straight axis. The thread engagement can be neglected so that cost is down and costs about repair and maintenance are also reduced. The control of water storage and draining is easy only by pressing operation. The cover and the resilient press unit are detachable for cleaning. 
         [0007]    To achieve above object, the present invention provides a dropping head for a wash basin or a bath basin, comprising: a base, a resilient press unit and a water block cover. The base is a hollow tube with a water drainage passage therein. A lower inner wall is installed with a bridge. A hollow cylinder is formed in a middle section of the bridge. The hollow cylinder is formed with a straight inner hole. A resilient press unit is installed within the base; a lower wall of the resilient press unit being a smooth wall and having a resisting edge at a middle section thereof. A size of the resisting edge being greater than an inner radius of a hollow cylinder so that the resilient press unit passes through the penetrating hole of the hollow cylinder and the resisting edge of the resilient press unit resisting against an upper edge of the hollow cylinder so as to be fixed to bridge of the base. A water blocking cover set is combined and fixed to the top of the resilient press unit. 
         [0008]    Further, a periphery of the outer threads of the base is engaged with an upper rubber washer, a lower rubber washer, a hard plastic washer and a first nut for locking the base to a water drain hole of a basin. 
         [0009]    Moreover, in the present invention, a rubber washer installed between the two second nuts and they further encircles a periphery of the base for adjusting the outer diameter of the base to tightly resist against an inner wall of a tube connect thereto. 
         [0010]    The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is an exploded view showing the elements of the present invention. 
           [0012]      FIG. 2A  is a cross sectional view showing the base of the dropping head of the present invention. 
           [0013]      FIG. 2B  is an upper view showing the base of the dropping head of the present invention. 
           [0014]      FIG. 2C  is a cross sectional view showing that the present invention is combined to a basin by using an upper rubber washer, a lower rubber washer, a hard plastic washer and a nut. 
           [0015]      FIG. 2D  is a schematic view showing the present invention with a structure for locking to a basin. 
           [0016]      FIG. 2E  is a schematic view showing the present invention with a structure for locking to a tube. 
           [0017]      FIG. 2F  is another schematic view showing the usage about the structure of  FIG. 2E . 
           [0018]      FIG. 2G  is another schematic view showing one application example about another structure of  FIG. 2E . 
           [0019]      FIG. 2H  is another schematic view showing another application example about another structure of  FIG. 2E . 
           [0020]      FIG. 3A  is a cross sectional view showing the resilient press unit of the present invention. 
           [0021]      FIG. 3B  is a cross sectional view showing the combination of the resilient press unit and other elements of the present invention. 
           [0022]      FIG. 3C  is a cross sectional view about the  FIG. 3B , where the cover has sealed the opening of the resilient press unit. 
           [0023]      FIG. 4  shows a prior art structure. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0024]    In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims. 
         [0025]    With reference to  FIGS. 1 ,  2 A,  2 B and  2 C, the structure of the present invention includes the following elements. 
         [0026]    A base  10  has a T shape cross section. A top thereof has a flange  12  by which the base  10  can be placed upon a through hole in a basin  90  (for example a basin of a bathtub or a wash-basin). An inner middle section of the base  10  is formed with a bridge  14 . A center of the bridge  14  is formed with a hollow cylinder  16 . An inner side of the hollow cylinder  16  is formed with a smooth hole. The base  10  serves for draining water. 
         [0027]    With reference to  FIGS. 2A ,  2 C and  2 D, an outer side of the base  10  is formed with outer threads  181  and inner side thereof is formed with inner threads  182 . An upper rubber washer  80 , a lower rubber washer  81 , a hard plastic washer  82  and a nut  88  are arranged round an outer periphery of the outer threads  181  for locking the base  10  to a hole of the basin  90 . The inner threads  182  serves to combine with outer threads of a tube  87  connected to the base  10 . 
         [0028]    In application, the upper rubber washer  80  and the lower rubber washer  81  clamps the basin  90 . The hard plastic washer  82  is installed below the lower rubber washer  81 . Then the nut  88  presses the hard plastic washer  82  and the lower rubber washer  81  to tightly resist against the lower wall of the basin  90 . 
         [0029]    With reference to  FIGS. 2A ,  2 E,  2 F and  2 G, another embodiment of the present invention is illustrated, in that, other than above mentioned elements, two nuts  86  and a rubber washer  84  are arranged around an outer wall of the outer threads  181 . The rubber washer  84  is installed between the two nuts  86 . In using, the two nuts  86  tightly clamp the rubber washer  84  so that the rubber washer  84  expands outwards to increase the outer diameter of the integral base  10 , as illustrated in  FIG. 2F . 
         [0030]    With reference to  FIG. 2G , in application, the base  10  is installed in to the basin  90 . Then the lower end of the base  10  is inserted into a tube. The expanded rubber washer  84  is adjustable and thus it will tightly resist against the inner wall of the tube so as to fix the base  10  to the tube. Moreover, the basin(g) and the tube are communicated with one another. 
         [0031]    Referring to  FIG. 2H , another application of the present invention is shown. In this application, the lower rubber washer  81 , hard plastic washer  82  and nut  88  are not used. The other application is identical to those shown in  FIG. 2G  and thus the detailed will not be further described herein. However, this structure has the effect of easy installation. 
         [0032]    Referring to  FIGS. 3A and 3B , a resilient press unit  20  is illustrated. The resilient press unit  20  is one like a prior art resilient press unit. When the upper end of the resilient press unit  20  is pressed, the resilient press unit  20  will descend and then fix at that point. When the resilient press unit  20  is pressed again, it will return to the original position. One resilient press unit is shown in Taiwan Patent No. M421346. The structure of resilient press unit can be seen in many prior arts and thus the details will not be described herein. 
         [0033]    In this embodiment, the resilient press unit  20  is shown with an integral form containing a casing and internal element (not shown). 
         [0034]    The resilient press unit  20  is installed within the base  10 . A lower wall of the resilient press unit  20  is a smooth wall and has a resisting edge  201 . The size of the resisting edge is greater than an inner radius of the hollow cylinder  16  so that the resilient press unit  20  can be fixed to the bridge  14  of the base  10 . A top of the resilient press unit  20  has a short screw rod  261 . When the resilient press unit  20  is pressed, the short screw rod  261  will descend and then fixed therein. When the short screw rod  261  is pressed again, the top of the short screw rod returns to the original position. 
         [0035]    A lower filter disk  30  is installed upon the resisting edge  201  of the resilient press unit  20 . The lower filter disk  30  has a plurality of holes for filtering undesired particles in the liquid flowing therethrough. 
         [0036]    An upper filter disk  32  is installed around the resilient press unit  20  and above the lower filter disk  30 . The upper filter disk  32  has a plurality of holes for filtering particles in the liquid flowing therethrough. The hole size of the holes of the upper filter disk  32  are greater than that of the lower filter disk  30  so that large or long particles (like hair) are firstly filtered by the upper filter disk  32  and small particles (like dirt) are then filtered by the lower filter disk  30  so that the flow is cleaned and thus no dirt will block the flow path between the basin and a tube connected to the base  10 . Thus liquid in the basin can drain out smoothly. 
         [0037]    A plurality of cleaning grains are installed between the lower filter disk  30  and the upper filter disk  32 . The cleaning grains will release some cleaning material to cause the space between the upper filter disk  32  and the lower filter disk  30  to have no undesired smell. Furthermore, liquid can freely flow from the basin to the drain tube connected thereto. 
         [0038]    A water blocking cover set  40  includes a cover  42  which is combined with the short screw rod  261  of the resilient press unit  20 . A top of the cover  42  is formed as an umbrella. An outer periphery of the cover  42  is formed with an annular trench for engaging with a water proof rubber ring  44 . When the cover  42  tightly engages to an opening of the base  10 , the inner space of the basin is isolated with the base  10 . A lower center of the water blocking cover set  40  is formed with a hollow post. Interior of the post is threaded for engaging with the short screw rod  261 . 
         [0039]    With reference to  FIG. 3B and 3C , according to the above mentioned components and the functions thereof, when the short screw rod  261  of the present invention is pressed, the short screw rod  261  will descend and then the resilient press unit  20  is fixed as a lower position. When the short screw rod  261  is pressed again, the short screw rod  261  will resilient to the original position. 
         [0040]    By above mentioned structure, when the cover  42  is pressed, the internal components of the resilient press unit  20  will cause the short screw rod  261  to descend and then fixed to the position. Then the cover  42  and the waterproof rubber ring  44  will complete seal the outer flange  12  of the base  10 , as illustrated in  FIG. 3C . On the contrary, when the cover  42  is pressed again, the top of the short screw rod  261  will return to the original position so that the cover  42  is released from the flange  12  of the base  10 , as illustrated in  FIG. 3B , as a result, water can drain out from the base  10 . 
         [0041]    The installation of the present invention will be described herein. Firstly, the water blocking cover set  40  is locked to the resilient press unit  20 . Then the base  10  with the water blocking cover set  40  is installed to the base  10 . Then the upper rubber washer  80  is engaged to the base  10 . Then the structure of the present invention is installed to a water drain hole of a basin  90 . The lower rubber washer  81 , the hard plastic washer  82  and the nut  86  are sequentially engaged to the base  10  from the lower side of the basin so that the structure of the present invention is fixed to the basin. When the cover  42  of the water blocking cover set  40  is opened, the cover  42  can be pressed to be positioned to a predetermined position. Then the cover  42  will seal the opening of the base  10  so that water can be reserved in the basin. When cover  42  is pressed again, it will restore so that the opening of the base  10  is opened and water in the basin can drain out. Above mentioned operation can be positioned repeatedly. When it discovers that the water cannot be drained effectively or some undesired smell emits from the dropping head. The water blocking cover set  40  and the resilient press unit  20  can be pulled out easily when the cover  42  is opened for checking the upper filter disk  32 , the lower filter disk  30  and the base  10  and to clean them. Furthermore, the drain tube of the wash basin can be retained in clear so that water can flow freely. 
         [0042]    In the present invention, the resilient press unit  20  causes that an object connected to the top of the resilient press unit  20  is axially moved in the base  10  and is fixed to a predetermined position. However, the structure of the resilient press unit  20  is not used to confine the scope of the present invention. 
         [0043]    Advantage of the present invention will be described herein. (1) The drainage and storage of water in the basin can be controlled easily by easy pressing operation. (2) The upper filter disk  32  and the lower filter disk  30  serve to block hairs and dirt, which conform to the current requirement of environment protection. Furthermore, by taking out of the cover  42 , the upper filter disk  32  and lower filter disk  30  can be taken out easily for cleaning. (3) The water blocking cover set  40  and the resilient press unit  20  can be taken out easily for cleaning so that the dropping head and water drain tube are cleaned. It is not moldy and no undesired smell occurs. (4) The manufacturers are unnecessary to form threads in the dropping head and pipes connected thereto. The initial cost is down. The costs in repair, maintenance and update are reduced. (5) The installation of expandable rubber ring to combining with the tube is advantageous for reduction of cost and simplification of working process. 
         [0044]    The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Summary:
A dropping head for a wash basin or a bath basin includes a base which is installed with an upper and a lower filter disk which are detachable for cleaning or updating. Cleaning grains can be placed between the upper filter disk and the lower filter disk. Cleaning material in the cleaning grains is released with draining water so as to have the function of odor-proof and cleanness of the pipes. A periphery of the outer threads of the base is sequentially engaged with an upper, a lower and a hard plastic washer and a first nut for locking the base to a water drain hole of a basin. A rubber washer installed between the two second nuts and they further encircles a periphery of the base for adjusting the outer diameter of the base to tightly resist against an inner wall of a tube connect thereto.