Abstract:
The embodied invention is an enhanced rotary brush tool that provides important cleaning on porcelain surfaces that are stained by hard water deposits. The brush tool incorporates an outer holder that includes a motor connecting end, a tapered shaft, an outer cup and shroud. A fill epoxy bonds the outer holder together with an internal strengthening rod and an abrasive pad. The overall assembly provides significant compressive strength to allow an individual to utilize pressure when scrubbing off the water hardness buildup.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of U.S. Provisional Patent Application No. 62/158,071, filed on May 7, 2015. The entire provisional patent application is incorporated by reference herein. 
     
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
       [0002]    Not applicable. 
       REFERENCE TO SEQUENCE LISTING, A TABLE, OR COMPUTER PROGRAM LISTING 
       [0003]    Not applicable. 
       BACKGROUND OF THE INVENTION 
       [0004]    (1) Field of the Invention 
         [0005]    This invention is directed to cleaning tools useful for scrubbing very hard debris from porcelain or similar surfaces, with minimal surface damage or scratching. In particular, the invention is directed toward cleaning off hardened water deposits off of vitreous china toilets (typically called porcelain). 
         [0006]    (2) Description of Related Art 
         [0007]    It is an observation that many city water supplies, and private well water systems, deliver hard water. Calcium, magnesium, and other hard ions are present in water at levels that are undesirable from a cleaning standpoint. Hard water is to blame for dishes with spots and residue, and bathtubs with significant film and soap scum. 
         [0008]    Additionally, the hard water ions create unsightly and unappealing lines on the surface of porcelain commodes. Normal evaporation at the water line in a commode will leave a noticeable residue after months (or years) of use. Also, the wetting of the surface from bowl filling around the rim will leave evaporative hardness lines that allows surface buildup. The resulting hardness adheres tightly, and the surface will often turn to colors such as grey or rust. Such surface residues are difficult to remove with normal scrubbing and cleaning chemicals. The surface has the undesirable appearance of being unsanitary, even if it technically does not allow bacteria to grow. 
         [0009]    U.S. Pat. No. 8,733,852 is a typical scrub brush that is used to clean a toilet from typical residual debris after a toilet is used. A housing provides a sanitary place to put the brush when not in use. The soft brush is generally capable of providing removal of soft debris, but the brush is far too soft to remove deposits due to hard water. 
         [0010]    U.S. Pat. No. 4,302,350 and U.S. application Ser. No. 11/772,935 are examples of chemical attempts to inhibit residue formation or harsh chemicals to clean the surfaces. Harsh chemicals are undesirable from a customer standpoint and are generally undesirable from an environmental standpoint. 
         [0011]    A pumice stone attached to a handle is one method used to manually abrade and remove hard water deposits. However, the manual labor used to remove deposits is significant. Additionally, the pumice stone wears quickly and is useable for only a few times. A pumice stone is difficult to adapt to a labor saving device, such as a rotary tool, due to the uneven wear. Also, a pumice stone means that the person doing the scrubbing will get their hands wet. This is an undesirable approach. 
         [0012]    What is needed is an affordable to satisfactorily clean a toilet bowl ring without getting hands wet, minimizes labor by use of a labor saving tool, and is capable of repeated use. 
       BRIEF SUMMARY OF THE INVENTION 
       [0013]    The embodied invention is an enhanced rotary brush tool that provides important cleaning on porcelain surfaces that are stained by hard water deposits. The brush tool incorporates an outer holder that includes a motor connecting end, a tapered shaft, an outer cup and shroud. A fill epoxy bonds the outer holder together with an internal strengthening rod and an abrasive pad. The overall assembly provides significant compressive strength to allow an individual to utilize pressure when scrubbing off stains. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S) 
         [0014]      FIG. 1  is a front view of the rotary brush tool. 
           [0015]      FIG. 2  shows a top view of the rotary brush tool. 
           [0016]      FIG. 3  shows a bottom view of the rotary brush tool. 
           [0017]      FIG. 4  is a cross section through  FIG. 1  and shows the inner epoxy and internal rod used to stiffen and glue the various parts together. 
           [0018]      FIG. 5  is an exploded view of the rotary brush tool. 
           [0019]      FIG. 6  is a view of the rotary brush tool when connected to the end of a rotary drill. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0020]      FIG. 1  shows a front view of the rotary brush scrubbing tool. A hex end  101  is used to connect the end of the rotary brush scrubbing tool to a motorized drill or similar piece of equipment. The hex end is rigidly connected to a tapered shaft  102 , which in turn, is rigidly connected to an outer cup  103 . The outer cup  103  is connected to a shroud  104  which surrounds an abrasive pad  105 . 
         [0021]    In  FIG. 1 , the tapered shaft and outer cup are preferably hollow and capable of receiving a filling/binding epoxy (not shown) that will be used to adhere the abrasive pad. The epoxy is preferably a two-part epoxy with an adhering strength of at least 1,500 psi. 
         [0022]    Even though the rotary tool in  FIG. 1  is described as individual parts, in production the entire part is preferably made from an injection molding machine in one piece for economic efficiency and for better connectivity without stress breakage. 
         [0023]    The abrasive pad is preferably a Butyl pad with a bonded diamond grit paste (petroleum based) that is baked on at oven temperatures until dried to create a bond. The grit size is based on the commercial screen size. For example, a 400 diamond grit is the output from a 400 mesh commercial screening process with a nominal opening of 0.0015″. In a preferred embodiment a 400 diamond grit is used. In general, a 300 or higher grit will provide the abrasion needed. Use of a diamond grit embedded into the Butyl pad provides for abrasive treatment of water spots with a diamond grit suitable for surface polishing, and also provides for minimize damage and scratching to the external glaze surface of the commode. The paste optionally includes a tin oxide (10000-12000 grit). The efficacy of the paste will last in multiple scrub events, and is preferably designed to withstand at least 30 uses in commode cleaning. 
         [0024]      FIG. 2  shows a top view of the rotary brush tool. The hex end  101  (or motor connection) is meant to be a connection to a rotary tool such as an electric drill. The hex end is alternately a square end or round end that will connect to a rotating motor fixture so that it is capable of withstanding torque without damage. To this end, the hex end  101  is solid plastic. 
         [0025]      FIG. 3  shows a bottom view of the rotary brush tool highlighting the brush pad. 
         [0026]      FIG. 4  is a cross section through  FIG. 1  and shows the inner fill epoxy  401  and internal strengthening rod  402  used to glue and stiffen the various parts together and increase the compressive strength of the rotary brush tool. 
         [0027]      FIG. 5  shows an exploded view of the rotary brush tool. An outer holder  501 , an internal reinforcing rod  502 , a fill in epoxy compound  503  (shown in the shape in which it is formed by the gap between the outer holder and the internal reinforcing rod), and rotary brush pad  504  are illustrated in perspective view. The assembly is glued together by the epoxy compound  503  which attaches the rotary brush pad to the outer holder. 
         [0028]    The internal reinforcing or strengthening rod is buried in the epoxy compound and is an important part of the rotary brush tool. The rod provides important stiffness and compressive strength to the assembly and prevents breakage when strong pressure is applied to the rotary brush pad when it is being used. During initial prototyping, it was found that the desired compressive strength was readily achieved with the rod present, and without it, the outer holder  501  experienced breakage in an important initial trial. In a preferred embodiment, the strengthening rod is a metal, preferably steel. In another preferred embodiment, the rod is advantageously threaded on the exterior so that the metal rod is completely and firmly encapsulated by the surrounding epoxy. 
         [0029]    The outer holder is preferably made from plastic, ABS in particular was found to be acceptable. Other plastics with similar stress properties could also be used. 
         [0030]    In a preferred embodiment, success in use of the rotary scrubbing brush is based rotating the brush pad with a motor and pressing the brush pad against the stained surface. The residual water in the base of the commode provides an acceptable lubrication during the cleaning and the pad will naturally touch the water during cleaning to provide lubrication. It is preferred that the application of the brush is generally applied to a water wetted surface. During the cleaning action, a small amount of the diamond paste will come out of the brush pad and is easily flushed out of the commode for environmentally safe removal. The amount of diamond paste bonded to the brush pad will dictate how long the brush pad will be effective. 
         [0031]    The shroud is helpful in keeping the pad from excessive spraying water during use. It was noted during a trial that a shroud-less pad will spray water in an unacceptable manner when the pad touches the water in the bottom of the commode. The shroud also helps to increase edge pressure on the brush pad when tipping the rotary scrubbing brush against the stained surface. In this case, the edge area of the pad is used for cleaning. This method helps to remove water hardness from stubborn areas of the commode. 
         [0032]    It should be emphasized that use of the rotary scrubbing tool provides improvements in the cleaning method that are harder to define. Cleaning of minor stains will take only a few minutes, and major stains should be addressable in 10-15 minutes of work. It is far easier to apply pressure and let a tool do the work than to use a manual scraping method such as a pumice stone. Also, the rotary brush scrubbing tool has a length that allows a cleaning person to keep their hands out of the commode water and eliminate the grimy feeling when cleaning the commode surfaces. 
         [0033]    It should also be noted that the use of the rotary brush scrubbing tool is not confined to only commode surfaces, but its use is applicable to a variety of porcelain surfaces, such as are found elsewhere in a house or a place of business. In particular, such surfaces include a commode surface, a bathtub surface, a sink, or a shower surface. 
         [0034]    While various embodiments of the present invention have been described, the invention may be modified and adapted to various operational methods to those skilled in the art. Therefore, this invention is not limited to the description and figure shown herein, and includes all such embodiments, changes, and modifications that are encompassed by the scope of the claims.