referring now to fig1 there is shown an agricultural harvesting machine 10 with a frame 12 that is supported by wheels 14 on the ground and can be coupled to a towing vehicle by means of a towbar 16 . baling rolls 18 surround a baling chamber 20 in which crop to be baled , which was taken up from the ground by a crop pick - up arrangement 22 , can be compressed into a bale . the baling chamber 20 extends through a forward , fixed housing part 24 and a rear housing part 26 , forming a discharge gate that can be raised for the ejection of a cylindrical bale . on each side of the crop pick - up arrangement 22 , a height gauge arrangement 28 is located , with which the crop pick - up arrangement 22 can be gauged at a certain height above the ground . the agricultural machine 10 described so far corresponds to a rotobaler of conventional configuration . indeed , the use of the height gauge arrangement 28 according to the invention is limited neither to a rotobaler of the type shown nor to a rotobaler at all . rather , other agricultural machines can be considered , for example , another baler , a self - loading forage box , a forage harvester , a combine , and the like . the crop pick - up arrangement 22 may be a pick - up as well as a cutter head , a corn head or the like , and can extend over the maximum width allowed for the transport on public roads . as can be seen , in particular in fig2 the crop pick - up arrangement 22 includes tines 30 circulating vertically in horizontally spaced rows that leave a spacing 32 between them that is covered by stripper vanes 34 . the tines 30 and the stripper vanes 34 are carried by a frame 36 to a rear side of which is fixed a pair of transversely spaced rear walls 38 that extend vertically beside walls of the frame 12 and contain a bearing 40 to which the frame 36 is coupled so as to pivot vertically . the bearing 40 is located above and to the rear of the frame 36 , but ahead of the support wheels 14 . the crop pick - up arrangement 22 can be repositioned in height by means of actuating arrangements , not shown , for example , linkages , rope pulls , hydraulic motors , etc ., in order to occupy thereby an upper transport position or to slide along the ground for crop pick - up . in the lower crop pick - up position , the crop pick - up arrangement 22 can float according to the surface of the ground . other than for the height gauge arrangement 28 , the crop pick - up arrangement 22 is of conventional configuration . the height gauge arrangement 28 includes a pivot arm assembly 42 , wheels 44 , skid shoes 46 , a pivot shaft 48 , and a bearing 50 . in the disclosed embodiment , the height gauge arrangement 22 is configured as an assembly that is attached to the underside of the crop pick - up arrangement 22 and extends almost or generally over its entire width . indeed , it would also be possible to configure it in each case with only one component ( pivot arm assembly 42 , wheel 44 , skid shoe 46 , pivot shaft 48 , and bearing 50 ) and to locate the narrower assembly at a location between opposite ends of the crop pick - up arrangement 22 . while in the disclosed embodiment two wheels 44 and three skid shoes 46 are provided , fundamentally one wheel 44 and one skid shoe 46 would be adequate . on the other hand , more than two wheels 44 and three skid shoes 46 could be provided , as long as this is practical and technically useful . compared to the support wheels 14 , each wheel 44 is of a relatively small diameter and is used for supporting the pivot arm assembly 42 on the ground , when the skid shoes 46 encounter an obstacle . the wheels 44 are located to the rear of the pivot shaft 48 , or as seen in fig1 to the right of the shaft 48 . each wheel 44 is engaged , free to rotate in an end region of an arm 52 , whose other end region is retained radially to the pivot shaft 48 . the wheels 44 may be provided with solid or pneumatic tires . in a simple configuration , the arms 52 may be retained and fixed against rotation on the pivot shaft 48 . in the embodiment shown , however , they are supported in bearings on the shaft 48 , free to pivot . the skid shoes 46 also extend radially from the pivot shaft 48 and are connected to it , fixed against rotation . although the skid shoes 46 are shown , according to fig3 connected directly to the pivot shaft 48 , the description in the following nevertheless is based on the fact that only the forward region shows a skid shoe 46 that is connected by an arm 54 with the pivot shaft 48 or that extends to it . as seen in fig2 the right - hand skid shoe 46 is also configured in such a way that it fits between the tines 30 , and in the extreme case , can be brought into contact with the underside of the stripper vanes 34 , without colliding with the tines 30 . on the other hand , it would also be possible to releasably attach wider plates 55 to the underside of the skid shoes 46 , as shown at the middle and left - hand skid shoes 46 , which plates 55 extend outside of the operating region of the tines 30 . the plates 55 act to minimize the ground pressure . furthermore , the removable plates 55 have the advantage that they could easily be replaced in case of wear or damage . alternatively , the skid shoes 46 in themselves could be configured in the shape of a plate . in a further embodiment , in place of fixed skid surfaces , rolls , wheels or the like could also be used . at the end opposite the skid shoe 46 , each arm 54 extends beyond the pivot shaft 48 and forms a support arm 55 that extends in the form of a scissors to the arm 52 . the pivot shaft 48 is preferably provided with a non - circular profile , for example , hexagonal , and extends preferably over the entire width of the height gauge arrangement 28 . alternatively , each wheel 44 could be connected with one or several skid shoes 46 . the pivot shaft 48 engages , so as to - rotate , at the rear lower corner region of the crop pick - up arrangement 22 by means of the bearings 50 and is secured in the axial direction by means not shown . a spring 56 is provided between the shaft 48 and the frame 36 of the crop pick - up arrangement 22 , which constantly resists counterclockwise movement of the shaft 48 and hence , downward movement of the skid shoe 46 , so that particularly when the crop pick - up arrangement 22 is raised , the skid shoes 46 do not project downward and collide with an obstacle , without being able to evade it , while a contact of the wheel 44 , then located at the bottom and able to move upward , leaves it undamaged . while the spring 56 is shown in the drawing as a torsion spring , a multitude of other springs could also be used , for example , leaf springs , helical compression springs , helical extension springs or even gas springs or the like . the spring 56 is retained at one end by means of an eye ( not shown ) and a screw 57 received in a bore provided in the shaft 48 , and is in contact at its other end under a preload at the rear , lower edge of the frame 36 , which indeed could also be configured differently . the bearings 50 are configured in the usual manner as slide bearings , roller bearings or ball bearings that are fastened in bearing shells 51 on the underside of the frame 36 . the spring 56 or several springs 56 are particularly useful to retain the skid shoes 46 generally upward in addition to the pivoting moments about the pivot shaft 48 due to the weight of the associated masses upon very uneven ground . the arms 52 for the wheels 44 are formed more or less from a flat steel strip with high bending strength . the arms 54 for the skid shoes 46 are configured comparably to the arms 52 . if the arms 54 simultaneously form the skid shoes 46 , they can be configured in a “ j ”- shape , as is shown in fig3 so that they can slide along the ground on the outer bend of the “ j ” instead of on its edge . the arms 52 and 54 can extend on the pivot shaft 48 immediately alongside each other , or spaced to the side alongside each other . in another embodiment , they can also be combined and configured as a one - piece component . in the embodiment shown , their longitudinal axes extend at an angle between them of approximately 140 °. since the arm 52 of the wheel 44 is supported in bearings , free to move on the pivot shaft 48 , the relative position between the arms 52 and 54 is maintained by means of a very strong spring 60 configured as a helical compression spring that can engage with one end the support arm 55 and with its other end on the upper side of the arm 52 . a screw 62 extends through the spring 60 and is secured in the support arm 55 as well as in the arm 52 , and is used to retain the spring 60 in its place as well as to maintain the angular spread between the arms 52 and 54 at a minimum . accordingly , the spring 60 on the one hand and the screw 62 on the other hand provide the assurance that the two arms 52 and 54 can be repositioned relative to each other within a certain region under a preload . a depression 66 , which is semi - circular in side view , is provided on the upper side of the arm 52 in a location for receiving a stop 68 , carried by the frame 36 when the pivot arm assembly 42 pivots to an extreme counterclockwise position . the stop 68 can be configured as a screw , a pin , a welded part or the like and can be attached to the frame 36 rigidly or so that it can be repositioned . the depression 66 and the stop 68 are located on a circular arc about the center of the pivot shaft 48 . on the basis of the above description , the operation is as follows : during operation , the crop pick - up arrangement 22 and the height gauge arrangement 28 take the position shown in fig3 in which the pick - up devices 30 brush over the ground , and the skid shoes 46 , as well as the wheels 44 , touch the ground . if the crop pick - up arrangement 22 is moved to the left as seen in fig3 that is , forward , and if a skid shoe 46 makes contact with an obstacle 64 , then the crop pick - up arrangement 22 moves upward . thereupon , a pivoting movement of the pivot arm assembly 42 , together with the pivot shaft 48 , is performed in the clockwise direction . since the wheel 44 is located on the ground and held there by the action of the coil compression spring 60 , the crop pick - up arrangement 22 is raised in the region of the pivot shaft 48 . as soon as the obstacle has been overcome , the skid shoe 46 is lowered again ; and with it , the crop pick - up arrangement 22 is also lowered . in an embodiment in which the wheel 44 is offset to the side with respect to the skid shoe 46 , the wheel 44 will not also roll over the obstacle 64 and will not lead to a renewed raising of the crop pick - up arrangement 22 . having described the preferred embodiment , it will become apparent that various modifications can be made without departing from the scope of the invention as defined in the accompanying claims .
a crop pick - up arrangement and height gauge arrangement is proposed in which , on the one hand , a skid shoe and on the other hand , a wheel are attached to a pivot arm assembly and can be pivoted about a horizontal transverse axis located between the skid shoe and the wheel . the skid shoe extends under the crop pick - up arrangement and therefore does not increase its width . crop pick - up arrangements and height gauge arrangements may be used on various kinds of agricultural machines for lifting crop into the machines for further processing or transport .