Abstract:
A reimpactor for an agricultural flail-conditioner is described to redirect conditioned crop to the rotating flail-conditioner for additional treatment prior to depositing it on the ground for drying. The reimpactor is constructed partially of a shock-absorbent material, such as urethane, so that it may retain its shape even upon impact with foreign objects such as stones or misshapen flails, thus displaying significant longevity and durability characteristics.

Description:
FIELD OF THE INVENTION 
     The present invention relates generally to flail-type crop conditioners for pull-type crop-treating equipment in the agricultural industry, and particularly to a flail-type conditioner that employs an improved reimpactor for redirecting treated crop material to the conditioning unit for additional treatment. 
     BACKGROUND OF THE INVENTION 
     During the process of producing and harvesting hay it is common to condition stalky plant material such as alfalfa, clover, or the like, by directing the crop material through a pair of conditioning rolls, thereby crimping the stems. This cracks the stems and thereby reduces the time cut plant material must remain in the field drying by increasing the rate at which moisture escapes. 
     In addition to crushing or crimping, it is also well known that plant drying can be further enhanced by subjecting the plants to the more severe conditioning provided by flails. Flail conditioning causes the plant stems to be even more severely crushed, with more of the waxy covering removed. The various levels of conditioning to which plant materials are subjected have a direct affect on the drying rate. 
     The instant invention relates to an improved reimpactor—a mechanism in a crop conditioning apparatus for redirecting materials already subjected to conditioning back to the conditioning unit for additional treatment. An example of a type of reimpactor is shown in U.S. Pat. No. 6,101,797, issued to Richard Koegel et al. on Aug. 15, 2000. Note, for example, in FIG. 3 thereof that guide elements  51  and  52  redirect the flow of crop materials in this maceration apparatus into the rotating impact rotor  23 . A macerator is somewhat different from a conditioner in that it is intended to even more severely crush the crop materials. 
     Another example of a reimpactor is used in a commercial flail conditioner sold by Kuhn and identified as the “ALTERNA 500”. An adjustable bar with protruding fixed finger elements, all extending in the same direction, is affixed above the flail. The bar may be rotated to move the finger elements into and out of the flow path of the crop material, thus adjusting the amount of crop material that is redirected into the flail for additional treatment. 
     Both the Koegel and Kuhn devices are rigid and thus in actual use become bent, deformed and broken when stones and other solid objects are passed through the apparatus. If, for example, a stone is fed into the conditioner and bends one of the fingers into the path of a flail element, either the finger or the flail element, or both, will likely be broken, and possibly even additional damage will result. 
     It would be desirable and beneficial to provide a reimpactor that would overcome the above-noted disadvantages of known reimpactors. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide an improved reimpactor for use in a flail-type crop conditioner. 
     It is another object of the present invention to provide a slotted reimpactor that is solid and rigid enough to withstand the severe operating conditions of a flail-type crop conditioner, i.e., able to absorb and withstand impacts from stones and other solid objects. 
     It is a further object of the instant invention to provide a flail-type crop conditioner that is quieter in operation, requires less power, is more durable, reliable, and long-lasting than those known in the prior art. 
     It is a still further object of the instant invention to provide a reimpactor for an agricultural flail-conditioner to redirect conditioned crop material to the rotating flail-conditioner for additional treatment prior to depositing it on the ground for drying. The reimpactor is constructed partially of a shock-absorbent material, such as urethane, so that it may retain its shape even upon impact with foreign objects such as stones or misshapen flails, thus displaying significant longevity and durability characteristics. 
     The foregoing and other objects, features and advantages of the invention will appear more fully hereinafter from a consideration of the detailed description which follows, in conjunction with the accompanying drawings wherein one primary embodiment of the invention is illustrated by way of example. It is to be expressly understood, however, that the drawings are for illustrative purposes and are not to be construed as defining the limits of the invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The advantages of this invention will be apparent upon consideration of the following detailed description of the invention, especially when taken in conjunction with the accompanying drawings wherein: 
     FIG. 1 is a top plan view of a disc mower flail-conditioner to which the instant invention has been applied; 
     FIG. 2 is a vertical section taken along line  2 — 2  of FIG. 1 with the area of the invention marked by circle area  3 ; 
     FIG. 3 is circle area  3  of FIG. 2 enlarged; 
     FIG. 4 is a plan view of that portion of FIG. 3 indicated by the line  4 — 4  of FIG. 3 with one reimpactor module removed and the shock-absorbent portion of the two adjacent modules broken away; 
     FIG. 5 is an enlarged sectional view taken along line  5 — 5  of FIG. 4 (reoriented to fit the page); 
     FIG. 6 is a plan view of a reimpactor module; 
     FIG. 7 is an elevation view of FIG. 6, from the side  7 — 7  thereof; 
     FIG. 8 is a sectional view of the module taken along line  8 — 8  of FIG. 7; 
     FIG. 9 is a perspective view of the one piece multiple tine casting; 
     FIG. 10 is an enlarged schematic view similar to FIG. 3 showing a second reimpactor in position; 
     FIG. 11 is a view similar to FIG. 3 but showing the prior art reimpactor; and 
     FIG. 12 is an elevational view of the prior art reimpactor taken on line  12 — 12  of FIG.  11 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to the drawings and, particularly to FIGS. 1 and 2, a hay-harvesting machine, commonly referred to as the pull-type flail-conditioner, incorporating the principles of the instant invention can best be seen. Any “left” and “right” references are used as a matter of convenience and are determined by standing at the rear of the machine, facing the forward end, in the direction of travel. 
     Flail-conditioner  10  is provided with a frame  12  adapted for mobile movement over the ground G by wheels  13  rotatably mounted thereon. The frame  12  is provided with a pivotal drawbar  14  that extends forwardly therefrom for connection to a prime mover, such as a tractor T, in a conventional manner. The frame  12  supports a header  15  by flotation linkage  16  for a generally vertical movement relative to the ground G as is conventionally known. The header  15  includes a conventional disc cutterbar  17  operable to sever standing crop material from the ground G and convey it rearwardly to the conditioning mechanism  20 . The drive mechanism  22  is supported from the drawbar  14  and the frame  12  to transfer rotational power from the prime mover in conventional manner to the operable elements of conditioner  10 . 
     Referring more particularly now to FIG. 2, the general conditioning mechanism  20  will be described in further detail. The conditioning unit  30  is comprised of an elongated drum  32  rotatable about shaft  34  that is generally transverse to the direction of travel of conditioner  10 . The flail segments  40 , as seen in FIG. 9 in detail, are comprised of a plurality of flail elements  42  which are rigidly affixed to member  44 . By mounting flail segments  40  on a shaft  46 , extending through tube  44 , the flail segments are pivotable about shaft  46  to the extent that they come into contact with drum  32  (see FIG.  10 ). The flail segments may be mounted on drum  32  in various configurations; however, the best arrangement seems to be staggered around the circumference of drum  32  such that they extend from one end of the drum to the other in a spiral fashion. 
     The conditioning unit  30  sits within a flail-conditioning chamber  50  formed by curved sheet  52 , end sheets  54  (FIG.  1 ), and the ground G. There is a forward entrance into the flail-conditioning chamber above and to the rear of disc cutterbar  17 , an exit below and to the rear of baffle  56 . Curved sheet  52  and baffle  56  are generally the same length as conditioning unit  30  and extend between end sheets  54 . The baffle  56  is adjustably mounted to move into and out of the flow of condition crop material to control, among other things, the thickness of the windrow. 
     Reimpactor  60 , as will be further described below, is affixed to the inside of curved sheet  52 . As the conditioner  10  moves through the field, crop is engaged to by disc cutterbar  17  and severed from the ground. It then flows rearwardly into the conditioning unit  30  where it is broken and crushed in a normal manner. As the crop material is treated it is thrown upwardly into and along curved sheet  52  where it engages reimpactor  60 . The reimpactor redirects the crop material to the conditioning unit for additional treatment, and then returned to curved sheet  52 , finally exiting onto the ground for drying. 
     The reimpactor  60  may vary in construction and methods of incorporation into the flail-conditioner. The best mode is what is shown herein specifically; however, one of skill in the art will readily see alternatives and modifications. Attention is directed generally to FIGS. 3-8 and  10 , but initially to FIG. 5 which shows that reimpactor  60  has a general triangular cross-section. FIGS. 6 and 7 show that reimpactor  60  has slots  62  therein which accommodate flail elements  42 . Thus, referring briefly to FIG. 3, it can be seen that reimpactor  60  extends into and through the circular path  62  created by the tips of flail elements  42 , while the flail elements  42  pass through slots  62 . This arrangement assures that the crop material does not build up in front of, or merely bypass, the reimpactor. 
     For convenience in assembly and replacement, reimpactor  60  is constructed in segments  66 , each containing five slots. The material chosen for the main body of the reimpactor is polyurethane; however, other durable, elastic shock-absorbing materials such as, for example, rubber, are available and could fulfill this purpose quite adequately. The triangular shaped portion of the reimpactor, perhaps best seen in FIGS. 5-8, is formed on a metal plate  68  having, in this particular embodiment, three flanges ( 72 ,  73  and  74 ). An elongated plate  70  is mounted to curved sheet  52  and has therein regularly spaced slots  75  into which flanges  72 - 74  may be inserted. By then fitting the flanges and plate  68  properly on plate  70 , reimpactor  60  will be in the position previously described and may be fixed there by the application of bolts  78 . In this manner multiple reimpactor segments may be affixed to plate  70  along the longitudinal dimension of curved sheet  52  as shown in FIG.  4 . The size of the reimpactor, in this embodiment the height of the triangular cross-section, may, of course, vary. It is of primary importance that the height be adequate to extend into the path of the flail elements as previously described. 
     FIG. 9 shows the flail segments  40  as having five finger-like elements  42 . This is a convenient structure for casting and, when considered in conjunction with a five-slotted reimpactor, presents a very convenient structure for retrofitting the instant invention onto older machines, as well as constructing new machines. The five-finger structure additionally allows greater tolerance between the flail elements  42  and the sides of the slots  62 , i.e., allows for larger slots. Cost effectiveness is thus improved. 
     FIGS. 11 and 12 show one prior art device that employs the rigid reimpactor. The flail-conditioner includes finger-like elements  80  which generate a path  86  at the tips thereof, which pass through rods  82  rigidly affixed to shaft  88 . The shaft  88  may be rotated from a position  89  where there is no reimpaction provided, to position  90 . All of the elements of the reimpactor are rigid and may thus be broken, bent or deformed if contacted by a stone or other solid object during operation.