Abstract:
A pivoting boot is disclosed for attachment to the unloading auger tube of combine harvesters, and serves as both a grain saving dam against unwanted grain spillage, and a directable spout. The boot permits evenly unloading grain onto, or completely filling, transportation vehicles or storage containers, without having to change the combine position, once it is staged for unloading.

Description:
TECHNICAL FIELD 
   The present invention relates to unloading grain, from the auger tube of a combine harvester, into a storage facility or a transporting truck, wagon, or other vehicle. It particularly relates to a grain saving boot assembly for the auger tube, and a dribble-proof method for directionally unloading grain, from the auger tube, when deploying the boot. 
   BACKGROUND ART 
   Unloading of grain from combine harvester storage bins, by way of an auger discharging said grain through a tube and spout, has had, inter alia, two continuing inefficiencies over the years, i.e. directability and spillage by dribbling. 
   First, when loading grain onto, for example, the bed of a truck, from an auger, generally the truck must be positioned so that the downspout of the auger tube is centered in relationship to the bed of the truck. Otherwise, the maximum amount of grain cannot be loaded onto the truck without subsequent maneuvering of one or the other vehicles. That is, if the combine is mis-positioned, the grain will not flow evenly onto the truck bed, hence, less than the optimal amount of grain is available for transport on the missed side of the truck bed. When grain unloads onto a truck, preferably it disperses evenly over the entire bed of the truck. 
   It is possible, of course, to move either the truck in relationship to the auger spout, or to move the combine so as to accurately place the auger tube over the truck bed. However, to do so has become more difficult over the years as the auger tubes have grown longer and longer, in order to keep pace with the ever-increasing width of modern day combine headers, which are now as wide as 42 feet or more. Many attempts have been made, in the art, to attach an assembly to the auger tube in an effort to adjust the direction of the discharge. Most of these prior art devices have been overly complicated, requiring many moving parts and complex operations. Others have been simple and are either ineffective or require time-consuming, manual adjustments such as certain elongated spout attachments that are unduly sensitive to movement and difficult to control. The complex operation, complexity of assembly, and/or complexity of disassembly, or the ineffectiveness have inhibited the devices from widespread commercial acceptance and/or the time-consuming methods for using them dissuaded their implementation. 
   For example, U.S. Pat. No. 2,625,001, entitled Grain Unloading Attachment, issued Jan. 13, 1953, to R. G. Huen, disclosed a mechanical spout that pivoted at the distal end of a grain unloading tube. The spout was not secure. Furthermore, the spout was not adjustable, except by hand, which would require operators to climb up and adjust it for every change in angle desired during unloading of the feed. 
   U.S. Pat. No. 5,167,581, entitled Directable Spout For A Conveyor, issued Dec. 1, 1992, to Steve Haag, disclosed a means for directing grain being discharged from an auger tube directly down through a trapezoidal funnel which incorporated a deflection plate to change the angle of discharge of the grain being unloaded from the auger. The hinges for the pivot plate were located within the pattern of flow of the grain and therefore were difficult to maintain, thus incurring damage and clogging. The deflection plate was unstable. Additionally, like other systems for directing the discharge, there was no means to save grain from dribbling, inadvertently, out of the end of the auger after the unloading was disengaged. Finally, the grain discharge would lose velocity as it flowed through the open funnel, thus losing efficiency. 
   U.S. Pat. No. 6,974,021, entitled Adjustable Grain Spout Assembly, issued Dec. 13, 2005, to Craig Boevers, disclosed a complex pivot spout assembly with many complicated attachments and parts which led to more frequent breakdown and damage. 
   A second unloading problem in addition to the directability of the grain discharge, is that of dribbling grain. Combine augers normally retain a small amount of grain in the housing or spout of the auger or tube surrounding the auger, after the unloading cycle is completed. The grain retained in the auger tends to slowly dribble out of the auger as the combine is transported in the field or along a road. Such loss is expensive and unsightly. Attempts to solve the problem have included shutters, doors, valves, etc. which have ancillary moving parts and extraneous components which add even more expense to the combine unloader. Examples of such dribble-proof doors were disclosed in U.S. Pat. No. 6,691,861, issued Feb. 17, 2004, to Mark J. Reimer, et al. 
   There have also existed spring-loaded flaps located inside the auger tube. Such anti-dribbling spring-biased members were designed to release and lower when the auger discharge begins, while springing back to a closed position after the discharge ceased. The problem is that such spring loaded impingements are not strong enough to hold grain residue over time, and tend to inadvertently release and allow grain to dribble out when weakened. 
   It would be a surprising advancement in the art if there were provided a means by which the combine operator could selectively direct the output of the combine unloading auger, so that precise location between the combine and the transport vehicle is not required, while nevertheless having a minimal number of moving parts, little expense, an infrequent need for maintenance or repairs, and while also having integral to such means having therein an anti-dribble capability that prevented inadvertent loss of grain through the auger tube. 
   SUMMARY OF THE INVENTION 
   In the present invention, a discharge boot is pivotably attached at the distal end of a combine auger unloading tube to direct grain as it exits the unloader tube. This pivotable discharge boot matingly and hingedly interfaces the distal end of the unloader tube via a spherical joint element that also seals the junction between the tube and the boot. The directional movement of the boot is controlled by an actuator such as a piston and cylinder linkage. The actuator is controlled by inputs from, for example, inside an operator&#39;s cab. In the process of the invention, the combine operator turns the unloading system off, and simultaneously, the discharge boot, having its pivotal movement synchronized with the activation of the auger discharge function, will instantly pivot up and act as a “grain saver”, preventing inadvertent grain spillage. When the operator engages the unloading system to initiate the auger, the discharge boot will automatically pivot down from its “grain save” position to its “nominal” operating position. While the auger is engaged and moving, the combine operator can manually adjust the position of the discharge boot up or down, in an infinite number of angles, diverging from the “nominal” position. The operator may use any input device such as a switch, button, lever, etc. on a console or, for example, integral to a propulsion handle. When the operator disengages the auger, the discharge boot automatically rotates up into the “grain save” position. Then, the unloader tube may be swung, from its unloading position, which is transverse to direction of the combine, back to its storage position which is in parallel or longitudinal relationship to the front-to-back direction of the combine. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a rear end view of a combine showing grain unloading from an auger tube into a truck; 
       FIG. 2  is a perspective view of the directable discharge boot of the present invention; 
       FIG. 3  is a partially cutaway view of the discharge boot and distal end of the unloading auger tube with the boot at its “nominal” angle; 
       FIG. 4  is a side elevational view of a partially cutaway cross-sectional view of the boot and the interface between it and the distal end of an unloading auger tube at its steepest angle down; 
       FIG. 5  is a partially cutaway cross-sectional view of the boot of the present invention and its interface with the distal end of the auger unloading tube when the boot is at the “grain save” position and the tube has swung back to its storage position; 
       FIG. 6  is a partially cutaway side view of the interface between the boot and the distal end of the unloading auger tube at the “grain save” position, showing how the dam impingement prevents soybeans from inadvertent spilling or dribbling out of the boot; and 
       FIG. 7  is a right side elevation of the rear of and the unloading auger tube of the present invention in longitudinal relationship to its combine harvester and the boot is in the “grain save” (G) position. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring now to  FIG. 1 , combine harvester  10  has its unloading auger tube  20  transversely extending and fully deployed as it unloads grain  100  through discharge boot  30  and into bed of truck  60 . Boot  30  can have any convenient shape. Preferably, it is generally cylindrical, but can be more boxy with edges, or venturi-shaped, etc. The opening of auger tube  20  at its distal end is peripherally sealed by a joint member  21  which hingedly engages portion  32  of boot  30 , which portion  32  interfaces the distal end of the auger tube  20 . The joint member is preferably rounded or spherical, but can be cylindrical on a horizontal axis, so long as the interface between the tube  20  and boot  30  is adequately sealed. Angularly extending from portion  32  of boot  30  is spout end  31  of the boot. Signals from cab  11  of combine harvester  10 , travel through conduits  47  for controlling an actuator  40 , which actuator  40  pivotally moves boot  30  in hinging relationship to the unloading auger tube  20 , via spherical joint  21 . Joint  21  also serves to seal the interface at end  32  of boot  30 . 
   As diagrammed at  FIG. 2 , buttons, switches, levers and other input devices for engaging and disengaging the on-off function of the auger may be designated at  51 . Devices for controlling the deployment of the tube  20  and pivoting of boot  30  may be designated at  53 . Both input devices are preferably located in the cab  11  of the combine harvester  10  and are programmed through controller  50 . As is more readily apparent from  FIG. 2 , boot  30  and unloading auger tube  20  have their hinging relationship manifested via pivot points at  41  on the tube,  42  on the lower end of the boot, and  45  on the upper end of the boot. Preferably there is an additional upper pivot point matingly connected via bracket  42  but on the outside wall (not shown) of boot  30 . Between pivot points  43  and  44  is connected an actuator  40  and supported by brackets  41  and  42 , fixed at the tube  20  and the boot  30  respectively. The actuator  40  is preferably a piston and cylinder type actuator, but optionally can be either an electronic, a pneumatic, or an hydraulic device, as desired. 
   Referring now to  FIG. 3 , it can be seen that boot  30  is defined by angularly disposed portions  31  and  32 . Portion  32  is the portion of boot  30  which interfaces with tube  20  and matingly engages spherical joint  21 , allowing opening  23 , at the distal end of tube  20 , to unload grain  100  traveling via the movement of auger  22  and discharging through boot  30 . Boot  30  is a hollow boot defined by outer walls  34  and inner walls  33 . Inner wall  33  is configured or shaped to define, at its lower portion, a dam impingement  35 , which slidingly moves along the lower portion of spherical joint  21  as boot  30  pivots. The surface shape of dam impingement  35  is in conformity with the surface topography of the spherical joint  21 . Boot  30  and its dam  35  are depicted in  FIG. 3  at a “nominal” position vis-à-vis angle N. In  FIG. 4 , it can be seen that dam  35  slides further underneath the interface of tube  20  along the lower surface of spherical joint  21  as the boot  30  is pivoted down from its “nominal” angle (N) to now reflect a steeper, if not the most steep angle D. 
   In  FIG. 5  the position of boot  30  in relationship to tube  20  is shown at a point and time when the boot has been pivoted up above horizontal into the angle G which is the “grain save” position. In the “grain save” (G) position, grain  100 , as a consequence of dam impingement  35 , is inhibited from spilling out of spout open end  36 . 
     FIG. 6  illustrates a close-up view of dam impingement  35  as it inhibits spillage of, for example, soybeans  100 . 
   In  FIG. 7 , auger  22  has been shutoff at input device A ( 51 ) at  FIG. 2  and by input device B ( 53 ) at  FIG. 2 , and the auger tube  20  has been moved to its storage position, longitudinally parallel to the length and direction of combine  10 . By way of signals through conduit  47 , linkage  40  has moved boot  30  into the “grain save” position. 
   In operation, the pivoting discharge boot  30  can be pneumatically, hydraulically, or preferably electronically controlled by an operator within cab  11  by input devices  51  and  53  through controller  50 . The method provided by boot  30  will entail, generally, although not being limited to, three principle steps:
         (1) When the operator engages or turns on the auger  22 , the tube begins unloading grain  100 , and simultaneously, or just prior thereto, the boot  30  will automatically pivot down from the “grain save” (G) position to the “nominal” (N) operating position.   (2) While the auger tube  20  is unloading grain  100  into, for example, truck  60 , the operator is able to adjust the positions of the discharge boot  30  up and down through an infinite number of angles ranging from the “nominal” (N) position to the (D) position or “deep” angle position or if desired upwards towards the “grain save” (G) position. The “deep” angle (D) position is programmed as the stop point, i.e. the steepest angle to which the boot will be allowed to pivot. That angle can vary depending upon a number of factors including, for example, the length of tube, the size of combine  10  and other design factors. A deep angle of 35° below horizontal may be desirable in some operations, while a “nominal” angle of 25-30° below horizontal may be suitable in such designs. The “grain save” position may be, for example, 15° above horizontal.   (3) Once the unloading function is disengaged, auger  22  ceases its rotation, and boot  30  instantly returns to (G) position. Tube  20  can be returned to its storage position.       

   In light of all the foregoing, it should thus be apparent to those skilled in the art that there has been shown and described a directable discharge boot assembly for a combine harvester&#39;s unloading auger tube. However, it should also be apparent that, within the principles and scope of the invention, many changes are possible and contemplated, including in the details, materials, and arrangements of parts which have been described and illustrated to explain the nature of the invention. Thus, while the foregoing description and discussion addresses certain preferred embodiments or elements of the invention, it should further be understood that concepts of the invention, as based upon the foregoing description and discussion, may be readily incorporated into or employed in other embodiments and constructions without departing from the scope of the invention. Accordingly, the following claims are intended to protect the invention broadly as well as in the specific form shown, and all changes, modifications, variations, and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention, which is limited only by the claims which follow.