Patent Abstract:
Method and apparatus for dispensing aggregates for lawn improvement. Aggregates are delivered to the site in a primary dispensing vehicle, which is configured to allow a smaller secondary dispensing vehicle to be loaded with the aggregate directly from the primary vehicle. The process includes aerating the soil, distributing a variety of soil amendments evenly over the area to be treated and then dragging a unique drag mat over the area to make a smooth contour and to even the distribution of the aggregate.

Full Description:
BACKGROUND OF THE INVENTION 
     The present invention relates, in general, to a method and apparatus for maintaining and improving the growth density of turf grass root systems in residential lawns, commercial lawns, athletic fields, recreational areas including golf courses and agricultural fields used for cattle grazing or hay production. 
     The invention described and claimed provides a more efficient and cost effective way of applying a variety of naturally occurring mineral based aggregates and soil amendments in a system which greatly improves the growing conditions for ornamental grass areas. In addition, the apparatus disclosed for these applications is of a unique design, which greatly improves growing conditions of grass turf and other planting materials by increasing the depth and density of the plant&#39;s root system. In addition, the efficiency of the process can be seen particularly in the application of granular aggregates as well as compost, fertilizer and other soil amendments. 
     To improve the appearance of an ornamental lawn it is desirable to eliminate the harmful effects of the thatch of dead grass and clippings which accumulate during the life of the lawn. In the past, this was accomplished by “dethatching” using power rakes or hand rakes to loosen the thatch and then raking the thatch from the lawn and disposing of it in a land fill or other dumping areas. This operation is time consuming as well as labor intensive. Since lawn improvements are most effective if carried out during the peak growing season, the labor described above is, of necessity done in hot and often humid weather conditions. 
     Another step in the traditional methods of lawn improvements is to deliver any materials to be applied to the lawn by truck and dump them in a pile on the site. Next, the material must be shoveled into wheelbarrows or distribution apparatus to be applied to the lawn. Again, the process is labor intensive and must be done under adverse weather conditions. If the shoveling task is to be avoided in the present systems, a front-end loader or similar machine must be trucked to the site for loading the distribution machine and picked up after the job is finished; another time consuming and costly event for the contractor. 
     The present invention also discloses a system including the order of application of various aggregates and amendments, which give the optimum growing conditions for ornamental grasses. If certain soil amendments are applied in the wrong sequence in the process or are not covered quickly by the next application, their effectiveness is diminished or totally lost. 
     SUMMARY OF THE INVENTION 
     The present invention overcomes these disadvantages by improving the efficiency of distribution of the materials to be applied to the lawn as well as using a specific order of application and selection of materials, which may be varied according to site conditions. 
     With the present invention any materials which are to be spread on the area are delivered to the site in a unique vehicle which allows the materials to be loaded directly into the final distribution machine thereby eliminating the labor intensive shoveling as well as speeding up the time for completing the job. 
     After application of the materials, they are smoothed using a unique drag screen which spreads the material evenly over the treated area and leaves a smooth eye-appealing surface. 
     Finally, this system disclosed herein provides a systematic method for applying the materials in the order that will give the most benefit to the growing area treated. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side view of the primary material distribution vehicle and the secondary distribution vehicle in the loading position. 
     FIG. 2 is a view of the discharge end of the vehicle of FIG.  1 . 
     FIG. 3 is an isometric view of the drag mat of the invention. 
     FIG. 4 is a view of the drag mat of FIG. 3 in operation. 
     FIGS. 5A and 5B illustrate the size and spacing of aeration holes. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring now to FIG. 1, there is shown generally at  10 , the primary delivery vehicle for the system. The vehicle comprises a basic truck frame for a truck having a total vehicle gross weight of 16,000 t0 33,000 pounds. The vehicle is equipped with a hopper type body  11  having sloping sides  13  to allow the load to be funneled toward the bottom of the hopper as the load is dispensed. Extending from the rear of the truck is the dispensing mechanism  23 . Note that the dispensing mechanism  23  is located approximately four feet above the ground so that a topdressing vehicle  22  can be backed under the dispenser  23  for loading. This will be described in more detail below. 
     The dispensing mechanism  23  consists of a chain link conveyer of any known type. The chain link conveyer runs the entire length of the lower surface of the hopper  11 . The chain link convey is activated by a pair of hydraulic motors  14  supplied with high-pressure hydraulic fluid from a pump driven by a power-takeoff from the truck engine. The pump speed is controlled by an electronic control panel  12  on the side of the apparatus  10 . Aggregate  20  is released from the hopper type body  11  by opening a gate  16  which is opened by a hydraulic piston  18  controlled by the electronic control panel  12 . The rate of delivery of aggregate can be controlled by regulating the speed of the motors  14 , by adjusting the opening of the gate  16  and by the speed of the vehicle truck engine which powers the power take-off feeding the hydraulic pump. 
     The topdressing vehicle or cab  22  is shown backed up to the dispensing mechanism  23  of the primary delivery vehicle loaded with aggregate  20 . The cab  22  has at its rear end a hopper  24  (FIG. 2) for receiving the aggregate  20 . Note that the hopper  24  of the cab  22  moves under the raised dispensing mechanism  23  of the hopper type body  11 . The cab  22  is of any commercially available machine and includes hopper  24  and a dispenser  26 . The cab  22 , hopper  24  and dispenser  26  together form the prior noted topdresser. The cab  22  is a power-driven vehicle similar in size to a standard golf cart on which the hopper  24  and dispenser  26  are mounted. 
     Referring now to FIG. 2, there is shown a more close-up view of the dispensing  26  of the primary delivery vehicle. Again, the hopper type body  11  is opened by use of the gate  16  operated by the hydraulic cylinder  18 . As can be seen, the aggregate  20  falls from the conveyer of the dispensing mechanism  23  directly into the hopper  24  of the topdresser. The advantages of this combination of apparatus allows the topdresser to be loaded directly from the primary delivery vehicle rather than having the primary load dumped in a pile on the site and then shoveled into the topdresser by hand, thus eliminating a substantial amount of labor and its associated costs. Using the equipment and method of this invention, a single operator can load ¾ to one ton of aggregate into the hopper of the topdresser in about 20 seconds after engaging the conveyer switch at the control panel  12 . 
     Referring now to FIG. 3, there is shown a detail drawing of the drag mat used in the practice of this invention. The leading edge of the mat  30  is made of a hardened steel bar approximately ⅜″ square. A frame  34  is a rectangle 3′6″ long and 2″4″ wide made of angle iron of about 1″×1″. In the area enclosed by the frame a flexible chain link material is fastened. At the front edge of the mat there is attached two loops  38  to which is attached to a cable or chain  40 . The cable or chain is joined at its distal end by a ring or other suitable means  42  for hooking the mat to a vehicle when it is to be used in the method. FIG. 4 shows the mat in operation. The detailed function of the mat will be described more fully in the description of the operation of the system. 
     FIGS. 5A and 5B show specified area of soil  44  to be treated, and the general plan for spacing, size and depth of aeration holes made in the first step of the method. “a” dimension indicates the core diameter, while the “e” and “f” dimensions indicate the center to center spacing of the cores, and the “d” dimension indicates the depth of the cores. The choice of these dimensions depends on the conditions set forth in Table 1 below. 
     In this first aerating step, a mechanized aerator unit is first sprayed with a cleansing solution to eliminate contamination from pathogens from previous applications. This cleansing step prevents the spread of turf grass diseases from one application site to another. The mechanized aerator unit is one that is adjusted for size, density and depth of core according to the information on Table 1 below. 
     
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Aeration core spacing 
               
             
          
           
               
                   
                   
                   
                 spacing 
                   
               
               
                   
                 dia. 
                 length 
                 inches on 
                 density 
               
               
                   
                 inches 
                 inches 
                 center 
                 cores per 
               
               
                 Soil Type 
                 (a) 
                 (d) 
                 (f) 
                 M sq. ft.  
               
               
                   
               
             
          
           
               
                 Heavy clay - clean 
                     ¾″ 
                 3.0″ 
                 3′  
                 6,000 
               
               
                 Heavy clay - sandy 
                 ⅝ 
                 2.5 
                 2.25 
                 23,000 
               
               
                 Sandy Loam 
                 ½ 
                 2.5 
                 2.25 
                 23,000 
               
               
                 Sand 
                 ⅜ 
                 3.0 
                 2.25 
                 23,000 
               
               
                 Loam 
                 ⅝ 
                 3.0 
                 2.25 
                 16,000 
               
               
                 Topsoil - clean 
                 ¾ 
                 2.5 
                 2.25 
                 23,000 
               
               
                 All soils - containing rock 
                 ¾ 
                 4.5 
                 6.25 
                 7,000 
               
               
                 All soils - lightly 
                 ¾ 
                 4.5 
                 6.25 
                 7,000 
               
               
                 Compacted  
               
               
                   
               
             
          
         
       
     
     The second step which is an optional step is to apply an even coating of a mycorrhizal fungus such as basidomycete ( Coprinus macorhizus ). Much of the fungus, which is spread in a powdered or pellet form, will fall into the aeration holes. This type of fungus forma a closely woven mass around the roots of the existing grass and may even penetrate the root structure enhancing the root system depth of growth and density of growth. An additional option in this second step is the application of fertilizer in pellet form. The selection of fertilizer blend of nitrogen, phosphate and potash is dependent on turf type, soil conditions and environmental conditions. 
     The next step is to spread an aggregate material, commonly called topdressing, over the area. The aggregate must be spread quickly after the application of the fungus (within 30 minutes) since the fungus will be damaged by exposure to the air for an extended period of time. This aggregate is preferably, a mixture of river washed sand of sieve size 33 with no more than 5% of fines sand, composted organic materials as well as other naturally occurring soil amendments, the selection of which are dictated by the soil conditions and environment. This application of aggregate material will, at least partially, fill the aeration holes thus protecting the fungus from deterioration as well as lightening the general character of the soil. This is particularly true when the basic composition of the soil is clay or other soil which resists the absorption of water and other nutrients. The sand will absorb water and nutrients and feed the grass roots needed amendments applied in the next step of the process. 
     After the sand has been spread, the entire area is dragged using the drag mat shown in FIG.  3 . The construction of the mat results in two benefits from the dragging step. First, the drag mat evens out the coating of sand to provide a uniform coating and breaks up the aeration plugs and distributes the soil therefrom with the sand. Secondly, the mat, because of its construction, levels the area treated. This is accomplished by providing the mat with a hardened steel leading edge about ⅜″ square in cross section and extending along the length of the front edge the mat. This hardened steel bar scrapes off the high points in the surface of the area and deposits the scraped-up soil into the low spots of the area. Soil scraped from high spots tends to flow over the leading edge of the mat and be dispersed through the openings in the chain link mat with the sand and aeration plugs. 
     It is to be understood that all of the aggregates applied, sand, compost, fertilizer as well as the fungus powder may be applied using the equipment described above. In the alternative, some of these may be applied using conventional manual spreaders if the makes this equipment more efficient. 
     Since many lawn areas have an uneven surface and also include planted areas which cannot be accessed easily by mechanized spreaders. In these areas all of the aggregates may be applied and smoothed manually. Also, even in the areas treated mechanically, it is often necessary to fill small voids using hand scoops and rake these areas by hand. 
     The final step in this process is to apply a liberal amount of water over the treated area. This step feeds the grass roots that needed moisture and helps in settling the various aggregate applied into a uniform aggregate coating. 
     The following table lays out the steps described above in a graphical manner to aid in understanding the method of the invention. 
     
       
         
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
             
             
               
                 1 
                 Aeration 
                 mechanically breaks up thatch and provides 
               
               
                   
                   
                 access to roots by aggregates 
               
               
                 2 
                 Spread fungus 
                 Encourages root growth 
               
               
                 3 
                 Spread sand 
                 Protect fungus &amp; receive aggregates 
               
               
                 4 
                 *Spread compost 
                 Add organic matter to soil 
               
               
                 5 
                 *Spread fertilizer 
                 Enhance growth 
               
               
                 6 
                 Drag 
                 Spread aggregate and smooth 
               
               
                 7 
                 Scoop 
                 Fill open spots 
               
               
                 8 
                 Rake 
                 Distribute and smooth scoops  
               
               
                   
               
               
                 *denotes optional step  
               
             
          
         
       
     
     Thus it can be seen that there is herein described unique apparatus for delivering and dispensing soil aggregates and a unique method of combining combinations of these aggregates in a specified order that will have a maximum effect in lawn improvement.

Technology Classification (CPC): 8