Abstract:
A fast and simple to use sifting litter box is provided. In an embodiment of the invention, the sifting litter box comprises two litter box trays oriented at a right angle with a screen placed in between the trays. Rotating the sifting litter box ninety degrees allows unused litter to sift through the screen while trapping clumped litter. The clumped litter can be discarded by removing the screen. Afterward, simply replace the screen back into the sifting litter box for the next cleaning cycle.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This present invention claims priority to U.S. Provisional Patent Application No. 62/304,204, filed on Mar. 5, 2016, and entitled, “Sifting Litter Box with Two Trays Creating a Right Angle,” the disclosure of which is incorporated by reference herein in its entirety. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of Invention 
         [0003]    The present invention relates to litter boxes and more specifically, to a sifting litter box with two litter box trays. 
         [0004]    2. Description of Related Art 
         [0005]    Household pets are exceedingly popular, in the United States and throughout the world. It is not uncommon for pet lovers to have more than one pet. One very popular pet is the domestic cat. According to the 2015-16 National Pet Owners Survey by the American Pet Products Association, the cat has surpassed the dog as the “pet of choice.” There are an estimated 77.8 million pet dogs and an estimated 85.8 million pet cats in the United States. Although cats are relatively low maintenance, owners who keep their cats indoors are faced with the litter box problem: how to best maintain and clean the box or tray into which the cat urinates and defecates. At best, it is an unpleasant task. And, for pregnant women and individuals with an immune-deficiency, it should be avoided due to risk of contracting toxoplasmosis, a parasite that can be passed to people through contact with feline feces (most litter products display a warning suggesting that pregnant women and immune-deficient patients avoid litter box maintenance). 
         [0006]    Pet product manufacturers have introduced products over the years to improve and meet the challenge of the litter box task, but clearly the advent of clumping litter in the mid-1980s is one of the most important. Prior to clumping litter, owners used granulated clay litter, which must be cleaned frequently and offers no odor control. Conversely, clumping litter solidifies wet urine and excrement, and deodorizes solid waste matter better than any other litter product. Clumping cat litter has quickly become the number one selling type of cat litter on the market. Other popular new cat litters are silica- and wood-based, which are clumping and non-clumping. 
         [0007]    Although clumping litter is an improvement over other options, the disposal and maintenance problem of such still exists. Several popular clumping litter brands refer to the products as “scoopable,” suggesting the use of a scoop to remove the clumped waste from the litter. This method sends the cat owner on unpleasant search missions through the litter. 
         [0008]    A need therefore exists for a litter box that reduces a cat owner&#39;s involvement in cleaning cat litter. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention provides a simple and inexpensive sifting litter box, which will automatically, upon a reversal of position, separate the litter from animal excrement. In an embodiment of the invention, the litter box comprises a first litter box tray that is joined to a second litter box tray. In joining the two trays at a substantially right angle, one tray will be oriented horizontally and the other tray will be oriented vertically. Additionally, the litter box comprises a screen that is disposed at the junction point of the two litter box trays and angled at a forty-five (45) degree angle. The screen has a handle for a user to grab when removing animal waste. When animal waste (i.e., clumped litter) is present, the sifting litter box is rotated ninety (90) degrees so that unused litter sifts through the screen while the waste is trapped without falling back into the empty litter box tray. The screen with waste is removed in a simple, tidy, and time-saving manner with a minimum of effort, cleaned, and then reinserted back into the litter box 
         [0010]    In an embodiment of the invention, a litter box comprises: a first litter box tray; a second litter box tray; and a removable screen disposed between the first litter box tray and the second litter box tray, wherein the removable screen comprises ribs spaced apart in a configuration to permit the passage of unused litter and prevent the passage of clumped litter. The first litter box tray and the second litter box tray are joined at a right angle to one another. The first litter box tray and the second litter box tray comprises a means for securing the first litter box tray to the second litter box tray. The first litter box tray and the second litter box tray each comprise a handle. The first litter box tray and the second litter box tray form a rounded rear section having a constant radius of curvature. The screen comprises a handle and a rim disposed on an edge opposite to the handle. The rim comprises a number of openings. 
         [0011]    In another embodiment of the invention, a method of cleaning a litter box including unused litter and clumped litter, comprises the steps of: rotating a litter box, wherein the litter box comprises a first litter box tray, a second litter box tray, and a screen disposed between the first litter box tray and the second litter box tray; and removing the screen. Prior to the step of rotating, the first litter box tray holds unused litter and clumped litter, and the second litter box tray holds no litter. After the step of rotating, the first litter box tray holds no litter, the second litter box tray holds unused litter, and the screen holds clumped litter. The step of rotating the litter box comprises the step of rotating the litter box ninety degrees. The method further comprises the steps of: discarding the clumped litter from the screen; and replacing the screen between the first litter box tray and the second litter box tray. 
         [0012]    An advantage to the present invention is it provides a simple, inexpensive manner to eliminate the necessity of hand scooping pet waste out of a litter box. Working with the strengths of clumping litter, by removing the clumps in one easy motion, without scooping, the present invention will reduce the time of the task and keep the user at a more comfortable distance without having to strain. The user does not need to lift the lifter box to sift the litter; all of the litter weight is always sitting on the floor. 
         [0013]    The foregoing, and other features and advantages of the invention, will be apparent from the following, more particular description of the preferred embodiments of the invention, the accompanying drawings, and the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    For a more complete understanding of the present invention, the objects and advantages thereof, reference is now made to the ensuing descriptions taken in connection with the accompanying drawings briefly described as follows: 
           [0015]      FIG. 1  illustrates a perspective view of a sifting litter box according to an embodiment of the invention; 
           [0016]      FIG. 2  illustrates a front view of the sifting litter box shown in  FIG. 1 ; 
           [0017]      FIG. 3  illustrates a side view of the sifting litter box shown in  FIG. 1 ; 
           [0018]      FIG. 4  illustrates a top view of a litter box tray of the sifting litter box shown in  FIG. 1 ; 
           [0019]      FIG. 5  illustrates a side view of a lifter box tray of the sifting litter box shown in  FIG. 1 ; 
           [0020]      FIG. 6  illustrates a disassembled view of the sifting litter box shown in  FIG. 1 ; 
           [0021]      FIG. 7  illustrates a screen of the sifting litter box shown in  FIG. 1 ; 
           [0022]      FIG. 8  illustrates a rear perspective view of the sifting litter box shown in  FIG. 1 ; 
           [0023]      FIG. 9  illustrates the sifting lifter box of  FIG. 1  with unused litter and waste; 
           [0024]      FIG. 10  illustrates the separation of unused litter from waste using the sifting litter box of  FIG. 1 ; 
           [0025]      FIG. 11  illustrates a rear perspective view of the sifting litter box of  FIG. 1  with the screen toted at a handle; and 
           [0026]      FIG. 12  illustrates insertion of the screen into the sifting litter box of  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0027]    Further features and advantages of the invention, as well as the structure and operation of various embodiments of the invention, are described in detail below with reference to the accompanying  FIGS. 1-12 , wherein like reference numerals refer to like elements. Although the present invention is described in the context of a cat litter box, the present invention can be deployed as a litter box for any type of animal capable of being lifter box trained including, but not limited to rabbits, ferrets, dogs, pigs, and birds. As used herein, clumping litter refers to any litter that is designed so that urine and feces can be removed easily from a litter box without having to empty the entire box, i.e., only clumped litter is removed while unused litter remains. Most clumping litter contains bentonite that allows the litter to form a solid clump as the litter absorbs liquid. There also alternative all-natural fibers that clump animal litter tightly, the identification of which is apparent to one of ordinary skill in the art. 
         [0028]      FIGS. 1-3  illustrate various views of a sifting litter box  10  according to an embodiment of the invention. The sifting litter box  10  comprises two litter box trays  12  and  14 , and a removable screen  30 . The litter box trays  12  and  14  are manufactured from a moldable material such as, but not limited to polypropylene, polystyrene, or resin. Polypropylene is a very strong substance that has the lowest density of plastics used in packaging, and has a high melting point, making it ideal for hot-fill liquids. Polystyrene is a very versatile plastic that can be rigid or foamed and has a relatively low melting point. General purpose polystyrene is clear, hard and brittle. Any of a class of solid or semi-solid organic resins of natural or synthetic origin can be used as well, generally of high molecular weight with no definite melting point. Most resins are polymers. Other rigid materials can be used including, but not limited to thermo-molded plastics, natural materials like wood or bamboo infused resin, or recycled plastics. When the trays  12  and  14  are joined together, the sifting litter box  10  has a relatively large radius of curvature, e.g., sixteen inches (16″) at its back corner  20 , which allows a user to create a smooth rolling action from a first position (where the litter box tray  12  is horizontal and in contact with a supporting surface) to a second position (where litter box tray  14  is horizontal an in contact with the supporting surface), and vice versa. Each litter box tray  12  or  14  has a built-in handle  32  or  34 , respectively, for the user to comfortably grab while rotating between the two litter box positions. 
         [0029]    Referring to  FIGS. 4 and 5 , each litter box tray  12  or  14  comprises a rim flange  22  or  24 , preferably angled at forty-five (45) degrees, for securing the two litter box trays  12  and  14  together, thus forming a ninety (90) degree or right angle between the trays  12  and  14 . In other words, in a first position, the litter box tray  12  is oriented horizontally while the litter box tray  14  is oriented vertically, as shown. Having a vertically oriented tray provides a privacy wall for pets. In less preferred embodiments, the angle of the ridge flanges  22  and  24  can be varied in order to form an obtuse or acute angle between the litter box trays  12  and  14 . 
         [0030]      FIG. 6  illustrates a disassembled sifting litter box  10 . In an embodiment of the invention, the rim flanges  22  and  24  optionally comprise a plurality of male/female pairs of fasteners such as, but not limited to holes and posts. For example, as shown in  FIG. 6 , one side of the rim flange  22  or  24  comprises a number of posts  26  and the other side of the rim flange  22  or  24  comprise an equal number of holes  28 . When joining the rim flange  22  of litter box tray  12  to the rim flange  24  of litter box tray  14 , the holes  28  receive the posts  26 . In an exemplary embodiment of the invention, the posts  26  are mushroom posts where a head of each post  26  is slightly larger than its corresponding hole  28 . Accordingly, insertion of a post  26  through a hole  28  snaps or locks the respective post  26  in place. Although only two posts  26  or holes  28  are shown, any number can be disposed around flange  22  or  24 . In other embodiments of the invention, other types of connectors may be used such as, but not limited to hooks and slots, bolts and nuts, turnbuckles, cotter pins, clips, or snaps, the implementation of which is apparent to one of ordinary skill in the art. 
         [0031]    The removable screen  30  permits sifting and separating clumping waste from clean litter. The screen  30  comprises a handle  31  and ribs  33 . Ribs  33  are spaced apart in such a way that unused litter can travel through the screen  30 , but clumped litter cannot. In another embodiment of the invention, the removable screen  30  comprises any type of sieve for separating clumped litter from unused litter, the identification and implementation of which is apparent to one of ordinary skill in the art, such as a riddle tool, spider utensil, or mesh strainer. 
         [0032]    In an embodiment of the invention, the litter box  10  comprises two outer guides  37  and two inner guides  39 . One outer guide  37  and one inner  39  is used at each side of the litter box  10  to provide a sliding channel for the screen  30  to slide in and out of the litter box  10 . An outer guide  37  provides a channel to fit over the rim flanges  22  and  24 . A respective inner guide  39  is fastened to the outer guide  37  via two screws, thereby holding the litter box trays  12  and  14  together. The posts  26  and holes  28  may be additionally used to strengthen the seal between the litter box trays  12  and  14 . In an embodiment of the invention, the outer guides  37  and inner guides  39  are polypropylene, polystyrene, a solid or semi-solid organic resin, thermo-molded plastic, a natural materials like wood or bamboo infused resin, or recycled plastics. 
         [0033]    Referring to  FIG. 7 , a rim  36  is provided on the opposite end of the handle  31 . The rim  36  matches the radius of curvature of the back corner  20  or the litter box  10 , creating a close fit. The rim  36  is provided on opposite faces of the screen  30 . Each rim  36  may optionally include openings  35  to add strength. In an embodiment of the invention, the screen  30  is polypropylene, polystyrene, a solid or semi-solid organic resin, thermo-molded plastic, a natural materials like wood or bamboo infused resin, or recycled plastics. Alternatively, the screen  30  is metal. The removable screen  30  is easy to clean when removed from the sifting litter box  10 . Interior surfaces of the litter box trays  12  and  14  are preferably smooth and free of any corners or protrusions for clumped litter to get stuck. 
         [0034]    Referring to  FIG. 8 , each litter box tray  12  or  14  may include a number of guides  38  to facilitate unencumbered rotation of the litter box  10  during cleaning, as described below. 
         [0035]      FIG. 9  illustrates the sifting litter box filled with unused litter  40  and waste  42  (i.e., clumped litter). Cleaning waste  42  begins with placing the sifting litter box  10  on a surface such as a floor as shown. Next, if not already in place, the screen  30  is inserted into the sifting litter box  10  through the guides  38  along the rim flanges  22  and  24 . The screen  38  rests on the bottom interior of the sifting litter box  10  as shown. Using the handles  32  and  34 , the sifting litter box is rotated counter-clockwise ninety (90) degrees. In other words, the litter box tray  14  is moved to a horizontal position, while the litter box tray  12  is moved to a vertical position as shown in  FIG. 10 . This causes the unused litter  40  to travel through the screen  30  while trapping the clumps and solid waste  42  on the surface of the screen  20 . The screen  30  is then removed using the handle  31  to lift the waste  42  away from the litter box  10 . After properly disposing the waste  42 , the screen  30  is placed back inside the litter box  10 . A user never has to lift the litter box  10  to clean it. Over time, it will be necessary to add fresh litter to keep a suitable litter level. 
         [0036]    In an embodiment of the invention, the handle  34  (or the handle  32 ) comprises grooves that match the spacing of the ribs  33  as shown in  FIG. 11 . The ribs engage with the handle grooves to stow the screen  30  on top of the litter box  10  if the user chooses to give more interior space for the animal. 
         [0037]      FIG. 12  illustrates insertion of the screen into the litter box  10 . 
         [0038]    The invention has been described herein using specific embodiments for the purposes of illustration only. It will be readily apparent to one of ordinary skill in the art, however, that the principles of the invention can be embodied in other ways. Therefore, the invention should not be regarded as being limited in scope to the specific embodiments disclosed herein, but instead as being fully commensurate in scope with the following claims.