Abstract:
A liquid applicator and scraper for applying a protective thin film of hardenable wax to glass during painting so that the surrounding area can be painted and the protective coating subsequently removed has a liquid container with a valve assembly for discharging the liquid to a sponge upon the application of pressure to the sponge, a blade unit which fits over the portion of the liquid container on which the sponge is mounted, the blade unit having a scraper blade affixed therein for removing the protective coating of wax after painting, and a cap for covering the portion of the blade unit in which the blade is affixed. The cap, the blade unit, and the liquid container, when assembled, form a single applicator and scraper unit with all components contained in one assembly.

Description:
This is a continuation-in-part of application Ser. No. 629,229, filed July 9, 1984, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to applicators and scraping devices, and in particular to a combination liquid applicator and scraper. 
     2. Description of the Prior Art 
     A problem in the field of interior and exterior building painting is that of masking portions of the building during painting which are not desired to be covered with paint, such as windows. In particular this problem arises when painting trim surrounding windows wherein the paint applicator must deposit paint immediately adjacent to the glass. The conventional solution to this problem is to cover the areas for which protection is desired with masking tape or, in large surface painting operations such as spray painting, to cover the window completely with paper or plastic affixed by tape or some other means. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a single unit having an applicator and a scraper for applying and removing a protective coating to surfaces such as glass which are not desired to be covered with paint during a painting operation. 
     It is another object of the present invention to provide such a combined applicator and scraper in a single hand-held unit. 
     It is a further object of the present invention to provide such a hand-held unit wherein all parts can be stored together in a compact closed assembly. 
     The above objects are inventively achieved in a combination applicator and scraper assembly having a liquid container with a valve assembly for regulating flow of liquid from the container to a sponge upon the application of pressure to the sponge, a removable blade unit which is press fit over the sponge for storage and which can be removed to expose the sponge to apply the liquid, and a cap which is also press fit to cover the blade of the blade unit during storage, and which can be removed to expose the blade. All three pieces are designed with the same exterior dimensions so that when assembled for storage a single compact unit results. 
     The applicator is used by rubbing the sponge along a surface, such as glass, to be protected so as to discharge a thin film of liquid wax or other suitable protective material onto the surface. The discharged liquid hardens to form a thin protective covering over the surface. The surrounding area can then be painted, sealed, varnished, or otherwise covered by any desired agent without danger of the agent coming into contact with the protected surface. After the paint or other material has been applied and is allowed to dry, the blade unit is placed over the sponge and the liquid container serves as a handle to run the flat edge of the blade along the service to remove the thin layer of hardened wax therefrom. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an exploded perspective view of a combination liquid applicator and scraper constructed in accordance with the principles of the present invention. 
     FIG. 2 is a sectional view of an assembled liquid applicator and scraper constructed in accordance with the principles of the present invention. 
     FIG. 3 is a plan view of the blade unit for the combination liquid applicator and scraper shown in FIG. 1. 
     FIG. 4 is a plan view of the liquid container of the combination liquid applicator and scraper shown in FIG. 1. 
     FIG. 5 is a fragmentary detailed view, partly in section, of the top of the liquid applicator shown in position for applying liquid to a surface. 
     FIG. 6 is a fragmentary side view of the combination liquid applicator and scraper shown with the blade unit positioned for removing a thin layer of hardened wax from a surface. 
     FIG. 7 is a perspective view of a method for applying a masking compound to a windowpane with an offset from the frame in accordance with the principles of the present invention. 
     FIG. 8 is a plan view of the application of a masking compound in accordance with the principles of the present invention as shown in FIG. 7. 
     FIG. 9 is a plan view showing the masking compound hardened in place on a windowpane and a layer of paint partially overlapping the compound. 
     FIG. 10 is a plan view showing removal of the hardened compound and a portion of the paint overlying the compound. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A combination liquid applicator and scraper constructed in accordance with the principles of the present invention is shown in unassembled form in FIG. 1 and in assembled form in FIG. 2. The unit basically consists of three main components, a liquid container 10, a blade unit 11, and a cap 12. The liquid container 10, which also functions as an applicator unit, has a container portion 13 comprised of, for example, plastic, and an applicator portion 14 which may also be comprised of plastic. The exterior of the top of the container portion 13 terminates in a flat rim 15, and the top of the applicator portion 14 terminates in a rim 14a. A sponge 16 is carried in the applictor portion 14. 
     As shown in greater detail in FIG. 2, the container portion 13 has a flange 17 which forms a recess for receiving a complementary flange 17a carried on the bottom of the applicator portion 14 for joining those parts together. The container portion 13 also has a generally circular vertical wall 18 for receiving a housing 19 which is integrally formed as part of the applicator portion 14. The housing 9 has a lower portion terminating in a socket 20 which receives a conduit 21 extending through liquid 22 contained in the container portion 13. The conduit 21 extends substantially to the curved base 23 of the container portion 13. 
     The housing 19 contains a valve assembly 27 having a nozzle 28 and a coil spring 29. The valve assembly 27 may, for example, also be comprised of plastic and may be a valve assembly of the type, for example, manufactured by Dab-O-Matic as described in one or more of U.S. Pat. Nos. 3,084,375; 3,091,374; 3,129,452; 3,192,553; 3,203,026; 3,378,330 or 3,653,779. 
     Upon depression of the nozzle 28 by virtue of pushing the sponge 16 against a surface 40, as shown in FIG. 5, liquid is permitted to flow through the conduit 21, through a valve seat 30, and into a reservoir 26. The reservoir 26 is formed by another wall 14b integrally formed as part of the applicator portion 14 and a baffle 25. The baffle 25 and the sponge 16 supported thereon are received in a receptacle formed by an upstanding flange 24, also integrally formed as part of the applicator portion 14. As shown in FIG. 4, the baffle 25 has a plurality of spaced holes 38 and 39 therein which may, for example, be of different sizes. Liquid contained in the reservoir 26 flows through the holes 38 and 39 in the baffle 25 and saturates the sponge 16, thereby permitting a thin film of the liquid to be applied to the surface 40. 
     In general, the liquid 22 is a hardenable wax of the type suitable as a car cleaner-polish. Two suitable compositions and methods of preparations for the liquid 22 are described below. 
     The first composition includes the following ingredients: 
     
         ______________________________________                      Parts byIngredients                Weight______________________________________UNION CARBIDE ® Silicone Fluid L-45 (435cSt)                      4.0UCAR ® Silicone AFL-40 2.0Wax S (available from American Hoechst,                      2.0Somerville, New Jersey)Mineral Spirits            15.0Kerosene                   15.0Oleic Acid                 2.0Water (distilled or equivalent)                      45.9Morpholine                 1.1Kaopolite 1152 (available from Kaopolite Inc.,                      10.0Elizabeth, New Jersey)Carbopol 934 (2% in water, available from                      3.0B. F. Goodrich, Cleavland, Ohio)                      100.0______________________________________ 
    
     The above ingredients are prepared as follows: The oleic acid, silicone fluid L-45, Wax S, and one-half of the mineral spirits and kerosene are combined and heated to 90° C. to melt the wax and obtain a clear solution. The morpholine is added with vigorous agitation. The silicone AFL-40 is added to the remainder of the mineral spirits and kerosene and the resulting mixture is combined with the above ingredients at 90° C. The Kaopolite 1152 is slurried into the water and the slurry is added to the hot solvent solution. Agitation is continued until a uniform blend is obtained. The Carbopol 934 is added with good agitation until a uniform mixture is obtained. The mixture is removed from the heat and mixing is continued until the mixture cools. 
     Another suitable composition as the following ingredients: 
     
         ______________________________________                       Parts byIngredients                 Weight______________________________________Dow Corning ® 536 Fluid 1.0Dow Corning ® 531 Fluid 6.0Witcamide ® 511 (available from Witco Chemical Co.)                       1.0Stoddard Solvent            22.0Kaopolite ® SF-0 (available from Kaopolite Inc.,                       10.0Elizabeth, New Jersey)Water                       60.0                       100.0______________________________________ 
    
     The above ingredients are prepared as follows: Half of the solvent is loaded into a mixing vessel and agitation is begun. The Dow Corning®536 Fluid, Dow Corning®531 Fluid and Witcamide 511 are added to the mixing vessel in that order. The remainder of the solvent is then loaded into the vessel, which will clean the pumping lines. When the mix is uniform, the Kaopolite®SF-0 is added and mixing is continued until the mix is again uniform. The water is added slowly and mixing is continued until the mixture is visibly thickened to the viscosity of light cream. Filtering is not necessary. 
     In the second composition, solvents other than Stoddard may be utilized. Substitution will depend upon the desired drying rate. Kerosene or Isopar®L and Isopar®M (available from the Humble Oil Co.) are also suitable for use as solvents. 
     Suitable liquid compositions and preparations are also disclosed in U.S. Pat. Nos. 3,960,575; 3,960,574; 3,544,498 and 3,508,933. 
     After the liquid polish or wax has been applied and the painting operation as been concluded, the hardened thin film of wax 41 is scraped away by the flat edge 33a of the blade 33 as shown in FIG. 6. The blade 33 is held in a tapered upper portion 32 of the blade unit 11, which terminates in an upper rim 37 surrounding the blade 33. As shown in FIG. 3, the blade 33 is ultrasonically welded at locations such as 42 so as to be permanently retained in the tapered portion 32. A lower portion 31 of the blade unit 11 has a hollow interior and has an interior diameter selected so as to retain the blade unit 11 over the applicator portion 14 of the liquid container 10 by press fit. 
     Application of a film 41 to a surface 40, such as a windowpane, is shown in FIG. 7. The windowpane 40 is held in a frame 42. The film 41 is applied by the sponge 16, functioning as an applicator surface. The outer edge of the applicator portion 14 is run along and in contact with the window frame 42. Because of the rim 14a, the film 41 is applied to the pane 40 at a slight distance from the edge of the frame 42, leaving a gap 44 of exposed, uncovered glass. Application of the film 41 in this manner is shown from above in FIG. 8. 
     The pane 40 with the hardened film layer 41 thereon is shown in FIG. 9 after coating the frame 42 with a layer 43 of flowable material, such as paint. The coating 43 has a portion 43a which has been deliberately during the application of the coating 43 been permitted to extend over the gap 44 and partially covers the film 41. Removal of the film 41, with the partial covering of paint, is shown on FIG. 10 using the blade 33. As described above, the blade 33 is held in the tapered portion 32 of the blade unit 11 and is slightly offset from the edges thereof by a rim 37. In a manner similar to application of the film 41, the edge of the tapered portion 32 is run along and in contact with the frame 42, thereby removing the film 41 and the partial covering of paint thereon, while leaving a covering of paint or other flowable liquid 43b in the gap. This bordering covering is deliberately left on the pane 40 in order to provide a seal between the pane 40 and the frame 42. 
     The width of the rims 14a and 37 is approximately the same, and may be approximately 1/32 of an inch. The border 43b will thus also be approximately 1/32 of an inch in width. 
     When not in use, the blade unit 11 is covered by the cap 12. The cap 12 has a continuous wall 35 which surrounds the tapered portion 32 of the blade unit 11 as well as the exposed portion of the blade 33. The cap 12 has a flat top 36. The cap 12 has a hollow interior and is seated on an upper rim 34 of the lower portion 31 of the blade unit 11 and has an interior diameter so as to be retained thereon by press fit. Additionally, the tapered portion 32 carries a detent 43 which receives a complementary shaped tab (not shown) carried on the interior of the cap 12 so as to further lock the cap 12 to the blade unit 11. 
     Although modifications and changes may be suggested by those skilled in the art, it is the intention of the inventors to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of their contribution to the art.