Abstract:
A crop divider of the cutting platform of a self-propelled combine harvester is loosely supported for floating and rocking movement in a vertical fore-and-aft plane, by a rearwardly extending frame member or spine of the divider being inserted into and extending through a pair of vertically slotted brackets, spaced fore-and-aft. The pivot point for the divider is thus undefined and may move back and forth between the front and rear brackets according to the operating height of the cutting platform.

Description:
BACKGROUND OF THE INVENTION 
     The invention concerns a crop divider, provided at a lateral end of a transversely extending harvesting header or gatherer for dividing the crop to be gathered from the standing crop, and more particularly, a means of mounting such a divider. 
     Crop dividers are well known and are used on a variety of harvesting machines. They are frequently used, for example, on cutterbar type harvesting platforms, the pointed ends of the dividers extending forwardly of the opposite ends of the cutterbar. Typically, dividers are pivotably mounted so that they are free to swing in a vertical arc in a fore-and-aft plane about a fixed single pivot point, to follow the contour of the ground. Some dividers are partially counter-balanced, for example, by springs. 
     In typical operation, with the harvester gatherer or platform at operating height above the ground, the divider rides on the ground to guide or divide the crop into the gatherer, pivoting up and down to follow variations in the ground surface. Typically, the operating height of the harvester gatherer or platform is vertically adjustable, the operator setting the height according to crop or harvesting conditions. The angle of inclination of the divider in a fore-and-aft plane when operating in contact with the ground will, of course, vary and depend entirely on the operating height of the platform. When the crop divider is carried on a simple single pivot, the range of divider angle of inclination or attitude thus defined, may significantly exceed an optimum range for efficient operation of the divider or divider point in dividing and lifting crop. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the invention to provide a mounting or support arrangement for a harvester crop divider so that it moves, in its working range, in a modified manner compared with the conventional simply pivoted crop divider. A more specific object of the invention is to provide a divider mounting arangement in which the divider effective pivot point and in which the change of angle of inclination of the divider point, for a given change in operating height of the platform, varies according to the operating height of the platform above the ground. 
     According to the invention, the crop divider is loosely supported in a generally fore-and-aft extending guide carried by the frame of the harvester platform or gatherer. An elongated fore-and-aft extending frame member or spine of the crop divider extends rearwardly through the guide. The form of the guide prevents rotation of the crop divider about its fore-and-aft axis, but permits pivoting and translational movement in an upright fore-and-aft plane. The pivot point of the divider with respect to the gatherer or platform frame may be said to be undefined, but engagement of the divider frame member or spine with the guide, in operation, establishes at least a pair of effective pivot points as the divider moves through its operating range. Movement of the crop divider frame member or spine within the guide is unrestricted, except for the provision of a stop arrangement, effective between the spine and the guide, for maintaining an approximately constant fore-and-aft disposition of the crop divider with respect to the guide. 
     In a preferred embodiment of the invention, the harvester gatherer or platform frame includes at each of its opposite ends a pair of vertical slots, spaced apart fore-and-aft, with the front slot rearward of the divider center of gravity. The slots are disposed and the spine is formed, so that the harvester platform elevated to a transport position, the crop divider point hangs down under the action of gravity with the spine &#34;stopped&#34; by the bottom of the front slot and the top of the rear slot. As the platform is lowered towards operating height, the crop divider point engages the ground and the spine effectively pivots about the bottom of the forward slot. As the platform is lowered further, the spine rocks back in the guide, eventually lifting from the bottom of the forward slot and engaging the bottom of the rearward slot, which thus becomes the effective pivot point. Upward movement of the divider point with respect to the platform frame is finally limited by the spine engaging the top of the front slot and the bottom of the rear slot. 
     Crop divider operating characteristics deriving from a divider mounting arrangement according to the invention are generally suitable for all operating conditions and include some significant and useful differences from those of conventional dividers. For example, upon first contact of the divider point with the ground, as the platform is lowered towards operating height, the effective pivot point of the divider is relatively forward so that the unbalanced weight of the divider is relatively low. Thus, ground pressure is also relatively low so that the divider point readily pivots upwards as lowering of the platform continues, or as ground surface conditions require. Friction between the divider point and the ground is relatively low and the reduced ground pressure reduces the possibility of the point digging in in soft conditions. 
     The relatively forward position of the divider effective pivot point, effective in the upper ranges of operating height, results in a desirable relatively rapid change in angle of inclination of the divider point for a given change in operating height, so that the divider point is rapidly rotated towards its optimum operating attitude as the platform is lowered. 
     In the lower ranges of operating height, used, for example, in down grain crops or soybeans, the rearward pivot is in effect. The greater radius arm from divider point to pivot means that the point can ride up with relatively less change in attitude or angularity, so that the point can continue to get under and lift down crop--the forward working tip of the divider point is kept close to the ground. 
     When an extra long divider is used, again as, for example, in harvesting soybeans or down or tangled crop, the possibility of translational movement of the spine within the guide becomes useful. If a ground-engaging surface or skid shoe on the bottom of the divider point is of significant length, the divider point may ride flat on the ground and rise up and down relative to the platform frame without substantial change in angularity or attitude. The &#34;looseness&#34; of the spine within the guide permits this mode of operation--equivalent to an effective pivot point at an infinite distance to the rear of the divider point. At low platform operating heights, with the divider point relatively flat on the ground, the effective rearward pivot point provided by the engagement of the spine with the rear slot, or the infinitely rearward effective pivot point of the floating mode, result in relatively greater pressure between the point and the ground, helping the point to hug the ground and get under the crop. In the flat attitude, there is less risk of the divider point digging into the ground. 
     It is a further advantage of a divider arrangement according to the present invention, that for a given length of divider assembly, including particularly the length of the divider elongated frame or spine member, the simple structure of fore-and-aft apertures with opportunity for vertical movement in both, provides a greater total range of floating adjustment for the divider point than a conventional pivoted divider having a similar range-limiting front bracket or aperture but only a simple single fixed pivot rearward of that aperture. The potential for rearward disposition of the effective pivot point gives a divider mounting according to the invention some of the advantages and operating characteristics of a simply pivoted long divider but using a shorter, inherently more stable structure. 
     In the invention, a simple structure provides not only a desirable floating range, but the mounting arrangement itself automatically provides stable support in transport, and there is no need for special stops or brackets. A further advantage of the invention is that, with adequate fore-and-aft spacing between the front and rear apertures or brackets, lateral stability of the divider is maintained without the need for additional stablizing structure. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a left front perspective view of a self-propelled combine harvester equipped with a cutting platform and having a pair of crop dividers according to the invention. 
     FIG. 2 is an enlarged partial rear three-quarter perspective view of the outer side of the right-hand crop divider of the combine of FIG. 1. 
     FIG. 3 is a semi-schematic elevation of a crop divider, according to the invention, with the divider point shown in a range of working positions. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The invention is embodied in a self-propelled combine harvester 10, shown in FIG. 1. Apart from the invention, the harvester is generally conventional. It is propelled by powered front wheels 12 and steered by rear wheels 14. The forward mounted vertically adjustable header 16 carries a front mounted gatherer or harvesting device, in this case a cutting platform 18, feeding gathered material to a feeder house 20 for transmission to the body of the harvester for processing. The harvester is controlled from an operator&#39;s station 22. 
     The cutting platform 18 has a material transfer floor or bottom 24, bordered by opposite fore-and-aft extending side walls, left- and right-hand, 26, 28, respectively, behind a conventional cutterbar 30. Crop dividers 31 and 32, left- and right-hand, respectively, extend forward from the side walls 26, 28, for dividing the crop and guiding a swath into engagement by the cutterbar 30. The dividers 31, 32, are generallly indentical but of opposite hand and only the right-hand divider 32, shown in FIG. 2, will be described in any detail. 
     The divider 32 includes a fore-and-aft extending main frame member or spine 34, in this case of tubular construction, carrying a frusto-conical divider point 36, having a divider point nose or shoe 37. Attachment of the point 36 to the spine 34 is reinforced and made adjustable by adjustable brace 38, including suitable hardware 40. The dividing and deflecting function of the divider point 36 is extended by outer and inner elongated deflectors 42, 44, respectively. Deflector 42 is tied directly to the spine frame member 34, while the inner deflector 42 is braced by a strut 46. 
     Spaced fore-and-aft, on the outside of the right-hand platform side wall 28, are a pair of guide brackets rear and front, 50, 52, respectively. The brackets each have generally vertically extending slots 54, 56, in the front and rear brackets respectively. The slots have opposite outer and inner upright edges, 58, 59 and 60, 61, respectively. Top and bottom portions of the slots are, front and rear respectively, top 62, 63 and bottom 64, 65. Preferably the slotted brackets 50, 52 are positioned so that the center of gravity of the divider 32 is forward of the front bracket 52. 
     A stabilizing flange 70 abuts and is rigidly attached to the end of the spine tube 34. In assembly, the flange 70 is inserted in the rear slot 56, and insertion of locking element or retaining pin 72 secures the divider 32 against fore-and-aft movement, but permits the flange 70 to slide up and down in the rear slot 56, with the butt end of the spine tube 34 adjacent the forward face 73 of the rear bracket 50. The fit of the flange 70 in the slot 56 and its vertical extent prevent the divider 32 from rotating about its fore-and-aft axis. Preferably, the fit of the spine 34 in the front slot 54 and of the flange 70 in the rear slot 56 are such as to provide lateral stability for the divider 32. But, it desired, this function could be provided or assisted by additional guide surfaces (not shown) independent of the slots 54, 56. 
     In operation, the handling of the combine harvester 10 is generally conventional. In transport the header 16 is usually fully elevated (not shown in the drawings), so that the divider 32 is clear of the ground and hangs in a &#34;ready&#34; position with the spine 34 resting on the bottom 64 of the front slot 54, and the flange 70 abutting the upper end 63 of the rear slot 56. The bottom 64 of the front slot 54 is inclined to form a vee with the upright outer edge 58. This cradles the spine 34 and reduces rattling of the divider during transport on rough terrain. 
     As the header is lowered into operating position (similar to the position shown in FIG. 1), the shoe 37 of the divider point 36 contacts the ground and the point 36 moves upwards relative to the platform 18 to a first operating position indicated by numeral I in FIG. 3. Here the flange 70 has come away from its upper stop 63, and the spine 34 is pivoting on the lower edge 64 of the front slot. Especially if the front bracket 52 is relatively far ahead, the weight of the divider 32 will be distributed so that a significant portion of the weight of the divider is borne by the front bracket 52, thus reducing the ground pressure of the divider point 36, so that it may respond more readily to changes in field surface levels. 
     As the cutting platform 18 is lowered still further, or as the divider rides up due to surface variations, the divider 32 may assume a position indicated at numeral II in FIG. 3, where the spine 34 is lifted from the bottom 64 of the front slot and is effectively pivoting, by means of flange 70, about the bottom end 65 of the rear slot. Ground pressure of the divider is thus relatively increased because of the rearward movement of the effective pivot point of the divider. Thus, during movement of the crop divider 32, from position I into position II, the effective pivot point travels or transfers from the front barcket 52 to the rear bracket 50. Momentarily, the pivot point for the divider is undefined and, at least in part of the range of operating height, because of the depth of the slots 54, 56, the divider is free to float in a translational mode as well as pivoting, with or without contact at the bottoms 64, 65 of the slots. Thus the advantages of a range of pivot or support arrangements is obtained with a simple, compact structure. 
     The displacement of the crop divider 32 between the positions I and II of FIG. 3 corresponds to a typical operating range. An upward limiting position is illustrated at numeral III of FIG. 3. The spine 34 is prevented from further upward movement by having come into contact with the top 62 of the front slot and the bottom 65 of the rear slot. 
     The free floating divider support arrangement of the invention has been illustrated in a self-propelled combine harvester application. But, of course, it may be used in other applications, such as the dividers of other harvesting machines, or even in such devices as a planter furrow marker, or in any application where it is useful for the ground pressure and pivoting characteristic of the ground-engaging portion of a device to be variable, at least in part, according to the operating position of the device relative to the frame which carries it.