Abstract:
In combination, a wheelbarrow and a cooperating sieve. The sieve has an outer frame and a central screen. One end of the frame is mountable on a lip of one side wall of the wheelbarrow as the remainder of the sieve is held in position by engagement of the end of the sieve opposite from the channel with the opposite side wall of the wheelbarrow.

Description:
FIELD OF THE INVENTION 
       [0001]    This invention relates to a wheelbarrow and sieve combination. 
       BACKGROUND OF THE INVENTION 
       [0002]    A combination of a wheelbarrow and a sieve is of course well-known and advantageous for many uses, primarily for separating soil or the like from other materials such as weeds or the like. However, sieves known heretofore for use with wheelbarrows have been either totally inflexible, i.e., intended for use with only a wheelbarrow of a given size and shape and/or inconvenient to mount on the wheelbarrow. 
         [0003]    For example, the sieve shown in the Curtis, U.S. Pat. No. 5,622,266 is usable only with a wheelbarrow having an upper, outer periphery of a specific shape. It is noted that a matching sieve must be manufactured for any given wheelbarrow and in its simplest version, the sieve comprises many elements which are suitably fastened together by screws, bolts, rivets or the like. 
         [0004]    The Jenkins, U.S. Pat. No. 2,767,886 shows a sieve on the bottom of the wheelbarrow which is entirely different from the arrangement with a sieve serving as a separator on the top of the wheelbarrow. 
         [0005]    Donnington, U.S. Pat. No. 4,350,584 shows a sieve connectable with a wheelbarrow, but this patent shows a complicated arrangement of projections and recesses as a way to adapt the sieve shown therein for different sizes and shapes of wheelbarrows. 
         [0006]    Thus, there exists a need for a new and improved sieve, combinable with a wheelbarrow, which has advantages of simplicity and flexibility. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention provides a new combination of a sieve and a wheelbarrow wherein the sieve is very easily mounted onto a wheelbarrow and in fact is easily mounted onto a large number of different sizes and shapes of wheelbarrows. 
         [0008]    These advantages of the present invention are achieved by providing a sieve which mounts onto the wheelbarrow in a very simple way and has dimensions such that it can fit essentially any conventional wheelbarrow. To achieve this result, the present invention recognizes and takes advantage of certain aspects of all conventional wheelbarrows. A first aspect is that all wheelbarrows, even if curved in the front and the back, have essentially straight, parallel side walls and those side walls are tapered downwardly and inwardly. Recognizing these wheelbarrow characteristics, the present invention provides a sieve with a channel which engages on one of the parallel side walls and wherein the cross dimension of the sieve extending across the wheelbarrow is such that the opposite end of the sieve securely engages the opposite side wall. 
         [0009]    The term “conventional wheelbarrow” refers to non-commercial wheelbarrows sold in home and garden outlets, as contrasted with larger and specialized commercial wheelbarrows. Applicant has observed that while these conventional wheelbarrows may come in different shapes and sizes, which sizes are usually four cubic feet and six cubic feet, they all have an essentially uniform width of approximately 26.5 inches, plus or minus an inch or so. 
         [0010]    As a result thereof, the cross dimension of the sieve, if selected properly, will securely engage the opposite side wall of any conventional wheelbarrow. Conventional wheelbarrows have inwardly downwardly tapering side walls. For a wheelbarrow with a width on the larger side of the narrow range of widths, the outer end of the sieve will fall short of the lip on the opposite side wall and rest against the upper part of the tapered part thereof. For wheelbarrow widths on the smaller side of the range, the opposite end will rest on top of the lip of the opposite side wall. 
         [0011]    The present invention also takes advantage of the fact that the straight side walls of conventional wheelbarrows are all generally of the same length as each other. Using this observation, Applicant has designed the longitudinal dimension of the sieve, i.e., the dimensions in the front to back direction of the wheelbarrow, as large as permitted by the length of the straight sides, stopping short of the curvatures of the wheelbarrow which transition into the front and rear thereof. 
         [0012]    It is an object of the present invention to provide a new combination of sieve and wheelbarrow, wherein the sieve is easy to mount onto the wheelbarrow. 
         [0013]    It is another object of the present invention to provide a new sieve and wheelbarrow combination wherein the sieve is universally mountable onto all conventional wheelbarrows. 
         [0014]    These and other objects of the present invention will become apparent from the detailed description which follows. 
     
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         [0015]    Preferred embodiments of the present invention will now be described by way of example with respect to the accompanying drawings of which: 
           [0016]      FIG. 1  is a top plan view of a sieve and wheelbarrow combination, in accordance with the present invention. 
           [0017]      FIG. 2  is a cross sectional view, taken along line  2 - 2  of  FIG. 1 . 
           [0018]      FIG. 3  is an enlarged perspective view of the sieve, viewed from below. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0019]    There follows a detailed description of preferred embodiments, wherein like elements are represented by like numerals throughout the several views. 
         [0020]    Referring to  FIGS. 1-3 , a sieve  10  comprises an outer frame  12  which includes an upper frame part  12   a  and a lower frame part  12   b.  A sifting screen  14  is mounted to the frame, and specifically, its outer periphery is engaged and held between the upper and lower frame parts  12   a  and  12   b.  The openings of the sieve may be of any suitable size as desired for a given application. Depending on the intended use, common opening sizes for such a screen may be ¼ inch or ½ inch, depending on the size and characteristics of the materials which are intended to remain on top of the screen while the soil falls therethrough. The sieve may be made out of any suitable material such as wood or plastic molding. A typical thickness of the sieve might be approximately 1.5 inches which gives it stability. However, it is contemplated that the sieve can be of any thickness, provided that it has sufficient stability to remain firmly in place when mounted on the wheelbarrow. 
         [0021]    The sieve  10  is specifically constructed and adapted for use with a conventional wheelbarrow as shown at  2  which comprises a pair of generally straight side walls  4  with upper lips  5 , a front wall  6  and a rear wall  7 . Numeral  3  shows schematically a conventional wheelbarrow understructure which is known, per se, and therefore not shown in detail. 
         [0022]    In order to simplify the task of mounting the sieve onto the wheelbarrow for use on different sizes and shapes of conventional wheelbarrows, the sieve includes an end frame portion  18  with a downwardly turned flange  20  which forms with an end of the lower frame part  12   a,  a generally straight channel  22 . At the end of the sieve opposite from the channel  22  is a through-opening  16  to be grasped by a user&#39;s hand to lift that part of the sieve. 
         [0023]    Engagement of the sieve with the wheelbarrow is made convenient, flexible and secure by the fact that the channel  22  fits neatly and securely onto a side wall lip  5  of a wheelbarrow while the opposite end thereof tilts down to engage the opposite sidewall  4 . The handle opening  16  is positioned to conveniently allow the user to grasp that end of the sieve and lift that end upwardly while the user grasps the end with channel  22  with the other hand, thereby removing the sieve from the wheelbarrow with the same convenient easy movement as that followed for mounting the sieve onto the wheelbarrow. 
         [0024]    The above-described construction of the sieve is such that it is universally applicable to virtually all conventional wheelbarrows. A preferred cross dimension of the sieve, i.e., the direction across the wheelbarrow as shown in  FIG. 2 , is approximately 25.75 inches. The distance across the top of a conventional wheelbarrow, as shown in  FIGS. 1 and 2 , is approximately 26.50 inches. The result is that, for this wheelbarrow, the end of the sieve opposite from the channel will move down below the lip  5  of the opposite side wall and rest securely against the tapered wall  4  located therebeneath. 
         [0025]    The width of conventional wheelbarrows will vary over only a small range. For a wheelbarrow of a greater width than as shown in  FIGS. 1 and 2 , the opposite end of the sieve will be securely engaged with a lower part of the tapered side wall, and for a narrower wheelbarrow, the opposite end of the sieve will sit on top of lip  5  of the opposite side wall  4 . 
         [0026]    To allow the sieve to be as long as possible in the longitudinal, i.e., the front to back direction of the wheelbarrow, the sieve may extend as far as the straight sides of the wheelbarrow, terminating where those sides curve to transition into the front and back walls of the wheelbarrow. 
         [0027]    The sieve has chamfered edges adjacent the ends of the channel  22  to adapt to the curvatures of the wheelbarrow transitioning from the sides into the front wall and back wall thereof. 
         [0028]    In operation, the user would place the channel  22  on a lip  5  of a straight side wall  4 . After placing the channel onto a lip  5  of the wheelbarrow, the user simply allows the sieve to pivot downwardly about its engagement of the channel with its lip  5  until the sieve engages the opposite wall of the wheelbarrow, whether that engagement is onto the lip  5  or onto the tapered wall of the opposite side wall. The user would select a sieve having openings of a size appropriate for the nature of the materials to be retained by the sieve. 
         [0029]    Although the invention has been described above with respect to preferred embodiments, it will be understood by those skilled in the art that modifications and variations are contemplated within the spirit and scope of the invention.