the crop lifter disks 10 and 12 , as shown in fig1 are part of a cucumber harvester 14 . the harvester 14 has a frame 16 supported by wheels ( not shown ). a tongue 18 of the frame 16 includes a hitch member 20 for attaching the crop harvester 14 to the drawbar of a tractor . the harvester 14 carries a harvesting assembly 22 for separating plant material from plant roots , cleaning conveyors 24 for separating soil and rocks from the plant material , processing assemblies ( not shown ) for separating fruit such as cucumbers from the vines , and a fruit storage bin 26 . a discharge conveyor 28 is provided for discharging fruit from the storage bin 26 . the crop lifter disks 10 and 12 , as shown in fig1 - 3 are mounted on a transverse horizontal shaft 30 . the shaft 30 is driven by a hydraulic motor 32 . the shaft 30 is journalled on bearings 34 and 36 that are supported by the harvester 14 and are vertically adjustable by screws 38 . a cutter blade 40 is moved forward under the ground and severs plants from their roots . as shown in fig7 the cutting edge of the blade 40 is slightly forward of the shaft 30 . the position of the blade 40 relative to the shaft 30 is adjustable by adjusting the screws 38 and the bearings 34 and 36 to raise or lower the shaft 30 . disk spreaders 42 are clamped to crossbeams 44 and 46 by u - bolts 48 . the crossbeams 44 and 46 are adjustably connected to fore and aft support beams 50 and 52 . the support beams 50 and 52 are pivotally connected to a conveyor frame 54 by pins 56 and uprights 58 . the uprights 58 are connected to the support beams 50 and 52 as well as to the conveyor frame 54 . the conveyor frame 54 is pivotally attached to the harvester frame 16 . a front beam 60 is secured to the forward ends of the support beams 50 and 52 . hydraulic cylinders 62 are connected to the uprights 58 and to the frame 16 . the cylinders 62 control the height of the forward conveyor end 64 of the primary conveyor 66 and the blade 40 . slide bearings 68 on the lower ends of the spreaders 42 engage the back sides of the flexible crop lifter disks 10 and 12 and force the peripheries 72 and 74 toward clamping engagement with each other . the disks 10 and 12 first engage each other or pinch foliage at a point 76 . the disks 10 and 12 separate from each other at a point 78 and drop the foliage and fruit connected to the foliage onto an upper run 80 of the primary conveyor 66 . the point 78 is about 35 ° from the point 76 about the axis of the shaft 30 . the rear ends of the spreader arms 42 are adjustably attached to the crossbeams 44 and 46 to permit adjustment of row spacing . the positions of the slide bearings 68 , the first engagement at 76 and the separation at point 78 are adjustable by threaded support members 82 and their location along the length of the spreaders 42 . slide bearings 68 are mounted on balls 84 that permit the bearings to pivot and maintain a maximum contact area on the disks 10 and 12 . deflection of the peripheries 72 and 74 of the disks 10 and 12 , by the spreaders 42 and slide bearings 68 , into engagement between points 76 and 78 tends to deflect the peripheries away from each other on the opposite side of the shaft 30 . when the rows of plants that are being harvested are close together , the outer periphery 72 of one disk 10 may contact the outer periphery 74 of a disk 12 on an adjacent row unit crop lifter 90 . each contact will occur generally above the shaft 30 and generally forward of the shaft . however , if two adjacent crop lifter row units 50 are close together , the contact between the outer edges 86 and 88 may extend more than 35 ° about the shaft 30 . row units 90 shown in fig4 and 5 have a disk 94 and a disk 96 . each disk 94 and 96 has a concave side 98 that faces toward the other disk in a row unit 90 . the axis 100 of each disk 94 and 96 is formed by a bolt 102 that clamps a disk to a support arm 104 which is fixed to the crossbeams 44 and 46 of the harvester 14 . the axis of rotation 100 of each disk 94 and 96 extends upward , forward and inward from the support arm 104 and toward the other disk of a row unit 90 . if the support arms 104 are not sprung out of shape , the axis of rotation 100 of the disks 94 and 96 of a row unit 90 will intersect each other at the vertical center of the row unit . the intersection will also be forward and above the locations in which each axis of rotation 100 passes through a support arm 104 . the disks 94 and 96 of a row unit 90 are rotated about their intersecting axes 100 by the engaged vegetation c and forward movement of the harvester 14 . the disks 94 and 96 move leaves and some vines toward the center of a row unit 90 and then clamp the vines between the two disks as the vines and to leaves enter the area where the disks are close to each other . continued rotation of the disks 94 and 96 lifts the vines and the attached fruit . in the area where the edges 106 of the disks 94 and 96 separate from each other , the clamping forces are released and the vines and foliage drop onto a harvester conveyor like the conveyor 66 shown in fig3 . the disks 94 and 96 could be rotated by hydraulic motors 108 if desired . there would most likely be a separate motor 108 for each disk 94 and 96 . the front end of the conveyor 66 passes along the surface of a field and attempts to pick up fruit that is not lifted by the crop lifters 10 and 12 or 94 and 96 . the action of lifting and dragging vines and fruit up the forward end 64 of the primary conveyor 66 , as the disks 10 and 12 do or the disks 94 and 96 do , tends to carry some fruit onto the conveyor that might otherwise be lost . the disks 10 and 12 are substantially flat and are somewhat flexible . the disks 94 and 96 with concave sides 98 are also flexible . however , the disks 94 and 96 with a concave side 98 are less flexible than the substantially flat disks 10 and 12 . the concave disks 94 and 96 will generally engage each other between points 76 and 78 as shown in fig7 . the concave disks 94 and 96 have sufficient flexibility to accommodate such contact . however , the crop material to be lifted may hold the disks 10 and 12 as well as the disks 94 and 96 out of contact with each other . if the crop material to be lifted is thick and dense , it may be desirable to space the disks from each other slightly as shown in fig5 . the disks 10 and 12 have peripheries 72 and 74 . the disks 94 and 96 have peripheral rims 110 and 112 . small diameter flexible tubing 114 is threaded through apertures 116 and across the periphery of the disks 10 , 12 , 94 and 96 as shown in the drawing . the tubing 114 tends to grasp crop material c and limit movement of the disks 10 , 12 , 94 and 96 relative to the crop material . the cutter blade 40 is attached to the bottom of arms 118 attached to the fore and aft support beams 50 and 52 . the blade 40 has upturned ends 120 and 122 which are pivotally attached to the arms 118 by bolts 124 . a second bolt 126 passes through a bore 128 through one of a plurality of bores 128 through each of the arms 118 and a bore through one of the upturned ends 120 and 122 . during operation of the harvester 14 , the cylinders 62 lower the blade 40 into the ground so that it moves under the surface , severs the roots from the rest of the plants and leaves the fruit such as cucumbers on top of the soil . in most conditions , the blade 40 is about two inches below the surface . if the soil top surface is flat the depth of the blade 40 can be reduced . the forward conveyor end 64 of the primary conveyor 66 is just above the surface of the ground . in practice the forward end of the primary conveyor 66 is in contact with the ground at least part of the time . the disks 10 and 12 as well as the disks 94 and 96 are above the ground and above fruit such as cucumbers that might be on the ground . the disks 10 and 12 are driven at a speed which is about the same as ground speed of the harvester 14 . at this speed , the disks 10 and 12 gently gather foliage and some vines , grip the crop material , raise the crop material and attached fruit and deposit the foliage and vines and the attached fruit on the primary conveyor 66 . the disks 94 and 96 , when driven by hydraulic motors 108 function the same as the disks 10 and 12 . however , due to reduced disk flexing , the disks 94 and 96 have a longer useful life than the disks 10 and 12 . the disks 94 and 96 gather and grasp foliage . as the harvester 14 moves forward , the stationary crop material clamped between the disks 94 and 96 causes the disks to rotate , lift foliage and fruit and then release the raised foliage and fruit on top of the upper run 80 of the primary conveyor 66 . this lifting of fruit with the foliage reduces or eliminates the bunching of fruit and foliage in front of the conveyor 38 and reduces separation of the fruit from the vines and stems thereby reducing fruit loss and fruit damage . reducing the buildup of material in front of the primary conveyor 66 also reduces the forces on the conveyor thereby increasing the life of the conveyor . the quantity of dirt and stones carried onto the conveyor 66 is also reduced . the disclosed embodiment is representative of a presently preferred form of the invention , but is intended to be illustrative rather than definitive thereof . the invention is defined in the claims .
the crop lifters include a pair of rotatable disks with rims that converge towards each other below and to the rear of their centers and that diverge from each other above and forward of their centers . as the disks are carried forward by a harvester , each pair of disks gather plant material , grasp the plant material , lift the plant material and then release the plant material above an elevating conveyor . the disks remain above the surface of the ground and are rotated by crop material as the harvester moves forward or are driven by motors . flexible disks have rims that are forced to converge by slide bearings . semi - ridged disks are mounted on axes that extend toward each other , upward , and forward from each disk center . a plurality of pairs of disks can be carried by one harvester . a knife severs plants from their roots forward of the conveyor .