Abstract:
A travelling rolling digger ( 1 ) for sequential hole drilling or for producing sequential cultivated spots in soil. The travelling rolling digger ( 1 ) includes at least one drilling shaft which is rotatable by a drive mechanism about a longitudinal shaft axis and has a rotating soil penetrating edge. The drilling shaft is mounted to roll about a horizontal shaft in a soil penetrating plane while the horizontal shaft moves in a direction of travel of the traveling rolling digger. The rotating drilling shaft enters the soil at an entry angle and digs into the soil while the horizontal shaft moves in the direction of travel and the drilling shaft continuously changes its angle relative to the soil from the entry angle to a vertical position. The traveling rolling digger further comprising at least one cleaning blade ( 6 ).

Description:
BACKGROUND OF THE INVENTION  
       [0001]     The present invention relates to a method and devices for cleaning hole diggers and spot cultivators from accumulated mud, which interfere with the digging or cultivating process. It is specially related to rolling hole diggers and spot cultivators as their high rate of digging or cultivating holes is very fast. As the time between holes is very short, it is important to prevent the accumulation of mud mechanically and not cleaning by time consuming and hard manual cleaning. The accumulated mud around hole digging and spot cultivating blades and shafts includes weeds, roots and other debris. The combination of mud with the string-like debris makes it very hard to clean, unless it is being cleaned immediately after digging each hole. The present invention thus provides a simple procedure and devices for cleaning hole diggers and spot cultivators automatically while they are being moved from one hole to the new one.  
         [0002]     It is an object of the invention to provide a method and apparatus for cleaning hole diggers and spot cultivators automatically while they are being moved from one hole to the new one. The method is specially beneficial for fast moving hole diggers and spot cultivators like the fast hole diggers (U.S. Pat. No. 4,732,229) and the rolling spot cultivators (U.S. Pat. No. 6,164,384) both of them were invented by the present inventor or including him with others which are hereby incorporated by reference.  
       SUMMARY OF THE INVENTION  
       [0003]     The invention provides a method for cleaning hole diggers and spot cultivators automatically while they are being moved from one hole to the new one. The cleaning method is using at least one automatic stationary cleaning blade, stationary shaft covering sleeves and counter rotating blades, all of them or any combination of part of them to fit the construction of the digger or spot cultivator (The term “stationary” in this application means nonrotatable relative to the rotating shaft or rotating auger).  
         [0004]     The at least one automatic stationary-cleaning blade is cutting the accumulated mud and debris as soon as the digging shaft is above the ground after digging a hole. The stationary shaft covering sleeves prevent the accumulation of mud and debris around the rotating shafts above the rotating blades of the digger. The counters rotating blades cut the debris and prevent them from accumulating with mud.  
         [0005]     In one preferred embodiment the at least one stationary cleaning blade is mounted on the main gearbox of a post hole digger by a pivoted arm. A depth-gage wheel or sledge is running on the ground surface at the rear side of the gearbox. The wheel is mounted to the main gearbox by another pivoted arm. The two pivoted arms are linked in such a way that the stationary cleaning blade is pulled backwards and above the ground when the digging shaft is entering the soil. After the digging operation, the post hole digger is lifted up by its lifting system which mounted it onto an operating vehicle. The operating vehicle moves with the post hole digger to the location of the new hole. The gage wheel is moving forward and pushing the at least one stationary cleaning blade to the rotating digging shaft. The at least one stationary cleaning blade cuts off the mud and debris which were accumulated on the digger while digging the last hole, thus the clean digger is ready for digging the new hole. The digger may be an auger for digging out a clean hole or a spot cultivator, which cultivates the soil in the hole with at least one rotating blade and leaves the soil in the hole.  
         [0006]     In another preferred embodiment, the at least one stationary cleaning blade is pivotally mounted on the main gearbox of a rolling spot cultivator. The at least one stationary cleaning blade is pushed at the digger and cuts off the mud and debris which were accumulated on it while digging the last hole as soon as the digger rolls upward from the hole. The automatic mechanism to push the at least one cleaning blade to the digger in its upward position and to lift it above the ground in the digging position is using a mass and pivoted arms. The automatic mechanism for changing the at least one cleaning blade positions is mounted at the side of the rolling gearbox of the machine and rolls with it. The operating mass is mounted on at least one pivoted arm, which lets it fall downward whenever the gearbox rolls around its horizontal axes which rolls the digger shaft upward after digging the hole. The at least one pivoted arm of the mass is linked to the at least one pivoted stationary arm of the at least one cleaning blade in such a way that it lifts the arm and the blades above the ground in the digging position of the digger. In the upper position of the digger the mass pushes the arm and the blades to the rotating digger. Thus the digger is being cleaned after each hole and is ready to dig the new hole. The digger may be an auger for digging out a clean hole or a spot cultivator, which cultivates the soil in the hole with at least one rotating blade and leaves the soil in the hole.  
         [0007]     In a special preferred embodiment to clean an auger-digger, the at least one cleaning blade can slide along its pivoted arm. As the cleaning blades enter between the auger&#39;s flights, they are being pushed by the flights to their ends sliding along the pivoted arm. In order to prevent breakage, the blades with their arms are pushed out of the auger flights by a cam rotating with the auger.  
         [0008]     In another special preferred embodiment to clean an auger-digger, the at least one cleaning blade can slide along its pivoted arm pushing a rod against a spring. As the cleaning blades enter between the auger&#39;s flights, they are being pushed by the flights to their ends. In order to prevent breakage, the rod pushes and slides along a curved rail. The curved rail is mounted on the arm of the mass and lifts the mass upward, which results in pulling the blades with their arms out of the auger flights. The spring slides back the at least one cleaning blade and the rod to its starting cleaning position as the mass moves downward.  
         [0009]     In another preferred embodiment the rotating shafts are covered by stationary covering sleeves. The stationary covering sleeves are mounted on the main gearbox of the post hole digger or the rolling spot cultivator. On the other side the sleeves are connected to bearing housings on the end of the shafts. The bearings allow the cultivator shafts and blades to rotate and cultivate the soil while the sleeves prevent the build-up of mud and debris around the shafts above the blades. The cultivating blades are mounted to the shafts and secured, preferable by pins or bolts.  
         [0010]     In another preferred embodiment the lower cultivating blades are rotating in the opposite direction to the upper portion of the digger, which has the auger flights or the upper set of cultivating blades. The counter rotating blades cut the debris and prevents them from accumulating with mud on the blades and the shaft between them. The driving pinion in the main gearbox is rotating two gears, one of them in one direction, and the other one in the counter direction. One of the gear wheels is connected to hollow shaft and rotates it in one direction, and the other gear wheel is connected to an inner shaft and rotates it to the counter direction The digger&#39;s hollow shaft is mounted to the hollow shaft of the gearbox by flanges (as an example) to rotate with it. The upper set of blades or auger flights is mounted to the hollow shaft by hollow pins, or bolts, around it, or welded to it, and rotates with it in one direction. The inner shaft of the digger is mounted to the inner shaft of the gearbox and rotates with it in the counter direction. The lower set of blades is mounted to the inner shaft of the digger and rotates with it in the counter direction to the upper set of blades or flights. The counter rotating blades prevent the mud and debris from accumulating between the blades. The stationary sleeve is mounted to the main gearbox and connected at its other lower end to the bearing housing on the hollow shaft of the digger to prevent the accumulation of mud and debris on the hollow shaft. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]      FIGS. 1, 1   a ,  1 ′ b  are a side view of a post hole digger with an automatic stationary cleaning blades in three positions of operation.  
         [0012]      FIG. 2  is a perspective view of a rolling spot cultivator with two rolling cultivators in the same forward moving plane with mud collected on its blades and shafts.  
         [0013]      FIG. 3  is a rear view of a rolling spot cultivator shaft in its upper position with two stationary cleaning blades at its side in a cleaning position.  
         [0014]      FIG. 3   a  is a cross section of  FIG. 3  showing the stationary cleaning blade in a cleaning position, cutting the accumulated mud near the rotating cultivator blades.  
         [0015]      FIG. 4  is a side view of a rolling spot cultivator shaft in its upper position with one stationary cleaning blade at its side in a cleaning position.  
         [0016]      FIG. 4   a  is a cross section of  FIG. 4  showing the stationary cleaning blade in a cleaning position, cutting the accumulated mud near the rotating cultivator blades.  
         [0017]      FIG. 5  is a rear view of a rolling spot cultivator shaft in its digging position with one stationary-cleaning blade at its side above the ground.  
         [0018]      FIG. 6  is a rear view of two rolling spot cultivator shafts, one in its digging position with one stationary cleaning blade at its side above the ground and the other in its upper position with one stationary cleaning blade at its side in a cleaning position.  
         [0019]      FIG. 7  is a rear view of an auger digger mounted on a rolling gearbox in its upper position with a stationary cleaning blade at its side in a cleaning position.  
         [0020]      FIG. 7   a  is a cross section of  FIG. 7  showing two stationary cleaning blades in cleaning positions, each one is mounted on a different parallel arm and cutting the accumulated mud at the rotating two auger flights.  
         [0021]      FIG. 8  is a rear view of an auger digger mounted on a rolling gearbox in its upper position with a stationary cleaning blade at its side at the end of a cleaning operation, pushed outside the auger flights by a curved rail. There is also an alternative cam to push the cleaning blade outside the auger flights.  
         [0022]      FIG. 8   a  is a cross section of  FIG. 8  showing the stationary-cleaning blade in a cleaning position, and outside the auger flight. There is also an alternative cam to push the cleaning blade outside the auger flights.  
         [0023]      FIG. 9  is a rear view of two auger diggers mounted on a rolling gear-box, one in its digging position with one stationary leaning blade at its side above the ground and the other in its upper position with a stationary-cleaning blade at its side in a cleaning position.  
         [0024]      FIG. 10  is a rear view of two spot cultivator shafts, one in its digging position and the other in its upper position, both of them with stationary sleeves around the cultivating shafts and one set of cultivating blades at their ends.  
         [0025]      FIG. 11  is a rear view of two spot cultivator shafts, one in its digging position and the other in its upper position, both of them with stationary sleeves around the cultivating shafts and two sets of cultivating blades at their ends at different depths.  
         [0026]      FIG. 12  is a rear view of two spot cultivator shafts, one in its digging position with its stationary-cleaning blade above the ground. The other in its upper position with its stationary-cleaning blade in a cleaning position, both of them with stationary sleeves around the cultivating shafts and one set of cultivating blades at their ends.  
         [0027]      FIG. 13  is a rear view of two spot cultivator shafts, one in its digging position with its stationary-cleaning blade above the ground. The other in its upper position with its stationary-cleaning blade in a cleaning position, both of them with stationary sleeves around the cultivating shafts and two sets of cultivating blades at their ends at different depths.  
         [0028]      FIG. 14  is a rear view of a spot cultivator shaft mounted on a rolling gearbox, in its digging position with two sets of blades. The upper set of blades is rotating in one direction while the lower set is rotating to the other direction. The shaft above the upper set of blades is covered with a stationary sleeve around it.  
         [0029]      FIG. 15  is a rear view of an auger digger mounted on a rolling gearbox, in its digging position. The auger flights are rotating in one direction while the lower set of blades is rotating to the other direction.  
         [0030]      FIG. 16  is a side view of a post hole digger with an automatic stationary-cleaning blades in three positions of operation. The auger flights are rotating in one direction while the lower set of blades is rotating to the other direction. 
     
    
     DETAILED DESCRIPTION  
       [0031]      FIGS. 1, 1   a ,  1   b  are a side view of a post hole digger with an automatic stationary-cleaning blades in three positions of operation. The auger digger  1  is in three relative positions to the soil surface: in position  14  the digger is lifted by the lifting arm  3  connected to the operating vehicle, above the soil surface. The stationary-cleaning blade  6  is at its cleaning position, cleaning mud and roots and other debris from the rotating auger digger  1  while the operating vehicle moves to the next digging spot. In position  14   a  the auger digger is lowered by the arm  3  to touch the soil surface and the depth control wheel  8  moves backward to position  8   a . By moving backward the wheel&#39;s arm  9  moves with the wheel  8   a  to the new position  9   a . The wheel&#39;s arm  9  is connected to the stationary-cleaning blade&#39;s arm  7  by a connecting link  10 . By moving to position  9   a , the wheel&#39;s arm pulls the blade&#39;s arm  7 , via the link  10   a  to its new position  7   a  thus pulling the stationary blade  6  outside the auger flights  1   a  to its position  6   a . At the end of the digging operation, the auger  1  is in its maximum depth under the soil surface  14   b . The wheel  8   b  follows the soil surface and its arm  9   b  and the stationary cleaning blade  6   b  are above the soil surface. When lifting the post hole digger by the arm  3 , the stationary cleaning blade is back at its cleaning position  6 , cleaning mud and roots and other debris from the rotating auger  1  while the operating vehicle moves to the next digging spot. The wheel&#39;s arm  9  and the blades arm  7  arm mounted on the main gearbox  2  of the post hole digger via bearings  12  and  11  and their base  13 . The auger digger  1  is mounted to the receiving shaft  5  of the gearbox  2 , which is powered by the vehicle engine, through a mechanical, hydraulical or electrical transmission (not shown) and the shaft  4 .  
         [0032]      FIG. 2  is a perspective view of a rolling spot cultivator with two rolling cultivators in the same forward moving plane, with mud  23  an  23   a  collected on its blades  24  an  24   a  and shafts  18  and  18   a . The frame  21  is for mounting the rolling spot cultivator to the operating vehicle and the beam  22  is connecting the other parts to the frame. The wheel  16  is rotating the hollow shaft  15  via the chain  17 . The rolling gearbox  2  is connected to the hollow shaft  15  thus rotating by the wheel  16 . The power for the rolling cultivator shafts  18  and  18   a  is transferred from the operating vehicle via the stationary gearbox  19 , the shaft  20 , running inside the hollow shaft  15  to the inlet shaft  4  (not shown) and the 90 degrees gears inside the rolling gearbox  2 . The vehicle moves forward thus rolling the rolling gearbox  2  forward by the wheel  15 , lowering one of the shafts  18  to penetrate the ground while the rotating blades  24  pulverize the soil around the shaft  18 . While rotating near and in the soil the blades  24  accumulate mud and weeds  23  which interfere with the tilling operation. Wile one shaft  18  with its blades  24  till the soil downward, the other shaft  18   a  with the accumulated mud  23   a  is pointed upward free to be cleaned.  
         [0033]      FIG. 3  is a rear view of a rolling spot cultivator shaft  18  in its upper position with two sets of tilling blades  24  and  25  and two stationary-cleaning blades  6  and  26  at its side in a cleaning position. The cleaning blades  6  and  26  are mounted on the blade&#39;s arm  7 , which is held in the cleaning position by the mass  31  and a connecting mechanism. When the tilling shaft  18  moves upward, after tilling the soil, as the gearbox  2  is rolling, the mass  31  falls down and pushes the stationary-cleaning blades  6  and  26  into the cleaning position. The shaft  18 , mounted on the out going shaft  5  powered by the inlet shaft  4  via the gears inside the rolling gearbox  2 , is rotating and the stationary blades  6  and  26  cut the mud out from it. The mass  31  is mounted on arms  32 , which are connected to the stationary-blades&#39; arm  7  via the pull arm  30  and the link  34 . The blade&#39;s arm  7  is mounted to the base plate  13  via the bearings  11 . The arms of the mass  31  are mounted to the base plate  13  via the bearings  35 . The base plate  13  is connected to the side of the rolling gearbox  2  which is mounted on the rolling hollow shaft  15  (not shown), by the flange  29 , and rolls with it in a vertical plane forward.  
         [0034]      FIG. 3   a  is a cross section of  FIG. 3  showing the stationary-cleaning blade  6  in a cleaning position, cutting the accumulated mud  23  near the rotating cultivator blades  25  mounted on the rotating shaft  18 . The blade&#39;s arm  7  is holding the stationary-cleaning blade  6  against the rotating mud  23 .  
         [0035]      FIG. 4  is a side view of a rolling spot cultivator shaft  18  in its upper position with one stationary-cleaning blade  6  at its side in a cleaning position. The tilling blades  24  and  25  are rotating with the shaft  18  against the stationary blade  6 , which is held in place by the blade&#39;s arm  7 . The blade&#39;s arm  7  is mounted to the cleaning axle  37  on one side and a strengthening arm  36  is mounted on it on the other side. A second blade&#39;s arm  7   a  ( FIG. 7   a ) can be mounted instead of the strengthening arm  36 . The cleaning axle  37  is mounted to the base plate  13  via the bearings  11 . The mass  31  is mounted downward on arms  32 , which are connected to the blades&#39; arm  7  via the pull arm  30 , the outer mass&#39;s arm  33  and the link  34 . The mass&#39;s arms  32  are connected to the mass&#39;s axle  38 , which is mounted to the base plate  13  via the bearings  35 . The outer mass&#39;s arm  33  is mounted to the mass&#39;s axle  38  and rotates with it and with the mass  31 .  
         [0036]      FIG. 4   a  is a cross section of  FIG. 4  showing the stationary-cleaning blade  6  mounted on the blade&#39;s arm  7  in a cleaning position, cutting the accumulated mud  23  near the rotating cultivator blades  25  and the shaft  18 .  
         [0037]      FIG. 5  is a rear view of a rolling spot cultivator shaft  18  in its digging position with one stationary-cleaning blade  6  at its side above the ground. As the gearbox  2  with the base plate  13 , both mounted on the hollow shaft  15  (not shown here) via the flange  29  rolls with the tilling shaft  18  downward, the mass  31  falls down. By falling down, the mass  31  pushes the pull arm  30  by the link  34 , which is connected to the outer mass&#39;s arm  33 , and lifts the blade&#39;s arm  7  and the stationary-blade  6  above the ground. Thus the tilling shaft  18  and blades  24  and  25 , mounted on the outgoing shaft  5 , can till the soil by being powered through the inlet shaft  4 .  
         [0038]      FIG. 6  is a rear view of two rolling spot cultivator shafts  18  an  18   a , one in its digging position  18  with one stationary-cleaning blade  6  at its side above the ground. The other cultivator shaft  18   a  is in its upper position with one stationary-cleaning blade  6   a  at its side in a cleaning position. The mass  31  is in its lower position lifting up the lower stationary-cleaning blade  6  and pushing the upper stationary-cleaning blade  6   a  to the upper digging shaft  18   a  to clean the mud. By moving forward the gearbox  2  with the digging shafts  18  and  18   a  will roll with the rolling hollow shaft  15  as the flange  29  mounts it on it. The digging shafts  18  an  18   a  rotate as the vehicle engine powers them by the transmission and the inlet shaft  4 . The base plate  13  rolls with the gearbox  2  thus letting the mass  31  to change positions by gravity, always lifting the lower stationary-cleaning blade  6  above the ground and pushing the upper stationary-cleaning blade  6   a  to the rotating upper digging shaft  18   a.    
         [0039]      FIG. 7  is a rear view of a rotating auger digger  1  with two auger flights  1   a , mounted on a rolling gearbox  2  in its upper position with stationary-cleaning blades  6  and  6   a  at its side in a cleaning positions. Each stationary-cleaning blade  6  and  6   a  is cleaning one flight of the auger digger  1 . As the auger digger  1  rotates the auger flights  1   a  push the stationary-cleaning blades  6  and  6   a  downward sliding along their arms  7  and  7   a  (not seen). The sliding base  39  is connected to a rod  41  with a spring  40  around it. The spring  40  is pressed by a plate  42  mounted on the pull arm  30 . The rod  41  protrudes through the plate  42 . The base plate  13  rolls with the gearbox  2  thus letting the mass  31  to change positions by gravity, always pushing the upper positioned stationary-cleaning blades  6  and  6   a  to the rotating digging shaft  18  in its upper position to clean it.  
         [0040]      FIG. 7   a  is a cross section of  FIG. 7  showing two stationary-cleaning blades  6  and  6   a  in cleaning positions, each one is mounted on a different parallel stationary-arm  7  and  7   a  and cutting the accumulated mud at the rotating two auger flights  1   a.    
         [0041]      FIG. 8  is a rear view of a rotating auger digger  1  mounted on a rolling gearbox  2  in its upper position with a stationary-cleaning blade  6   a  at its side at the end of a cleaning operation, pushed outside the rotating auger flights  1   a  by a curved rail  41 . There is also an alternative cam  44  to push the stationary-cleaning blade  6   a  outside the rotating auger flights  1   a . In the cleaning operation, the stationary-cleaning blade  6   a  is pushed by the rotating auger flights  1   a  to their end. At that point the stationary-blade  6   a  is pushed out of the rotating auger flights  1   a  by a cam  44  or by the spring rod  41  as it slides along the curved rail  43 . By pushing the curved rail  43 , the rod  41  lifts the mass  31  half way up and pulls the stationary-blade  6   a  with its arm  7  out of the rotating auger flights  1   a . The spring  40  slides back the stationary-blade  6   a  and the sliding base  39  to be in another cleaning operation, unless the gearbox  2  rolls down and the falling mass  31  will pull the stationary-blade  6   a  above the ground.  
         [0042]      FIG. 8   a  is a cross section of  FIG. 8  showing the cleaning blade  6  in a cleaning position and cleaning blade  6   a  outside the auger flight  1   a . There is also an alternative cam  44  to push the stationary-cleaning blade  6   a  outside the auger flights  1   a.    
         [0043]      FIG. 9  is a rear view of two rotating auger diggers  1  and  1   b  mounted on a rolling gearbox  2 . One rotating digger  1  is in its digging position with one stationary-cleaning blade  6  at its side above the ground and the other  1   b  in its upper position with a stationary-cleaning blade  6   a  at its side in a cleaning position. The mass  31  is in its lower position lifting up the lower stationary-cleaning blade  6  and pushing the upper stationary-cleaning blade  6   a  to the upper rotating auger digger  1   b  to clean the mud. By moving forward the gearbox  2  with the auger diggers  1  and  1   b  will roll with the rolling hollow shaft  15  as the flange  29  is mounted on it. The auger diggers  1  and  1   b  rotate as the vehicle engine powers them by the transmission and the inlet shaft  4 . The lower rotating auger  1  penetrates the soil to dig the clean hole, while the upper rotating digger  1   b  is being cleaned. The base plate  13  rolls with the gearbox  2  thus letting the mass  31  to change positions by gravity, always lifting the lower stationary-cleaning blade  6  above the ground and pushing the upper stationary-cleaning blade  6   a  to the rotating upper auger digger  1   a . The curved rails  43  and  43   a  are for pushing the cleaning blade  6  or  6   a  out of the digger flights  1   a  as was explained earlier.  
         [0044]      FIG. 10  is a rear view of two rotating spot cultivator shafts  18  and  18   a . Shaft  18  is in its digging position and shaft  18   a  is in its upper position, both of them with stationary sleeves  45  and  45   a  around the cultivating shafts and one set of rotating cultivating blades  24  and  24   a  at each of their ends. The sleeves  45  and  45   a  are connected to the gearbox  2  by bolts  47  and  47   a  to prevent them from rotating with the cultivator shafts  18  and  18   a . On their other side the sleeves  45  and  45   a  are connected to the bearing housings  46  and  46   a . The bearings allow the cultivator shafts  18  and  18   a  to rotate while the sleeves  45  and  45   a  prevent the build-up of mud around the shafts while they are cultivating the soil in their downward position. For assembling, the two sets of the cultivating blades  24  and  24   a  are mounted to the shafts  18  and  18   a  after mounting the sleeves  45  and  45   a  to their place with the bearings  46  and  46   a . In order to secure the blades  24  and  24   a  to the shafts  18  and  18   a , hollow pins  48  and  48   a  are pushed inside them after mounting.  
         [0045]      FIG. 11  is a rear view of two spot cultivator shafts  18  and  18   a . Shaft  18  is in its digging position and shaft  18   a  is in its upper position, both of them with stationary sleeves  45  and  45   a  around the cultivating shafts and two sets of cultivating blades at their ends at different depths  24  and  25  on shaft  18  and  24   a  and  25   a  on shaft  18   a . The sleeves  45  and  45   a  are connected to the gearbox  2  by bolts  47  and  47   a  to prevent them from rotating with the cultivator shafts  18  and  18   a . On their other side the sleeves  45  and  45   a  are connected to the bearing housings  46  and  46   a . The bearings allow the cultivator shafts  18  and  18   a  to rotate while the stationary-sleeves  45  and  45   a  prevent the build-up of mud around the shafts above the blades  25  and  25   a  while they are cultivating the soil in their downward position. For assembling, the two sets of the cultivating blades  24  with  25  and  24   a  with  25   a  are mounted to the shafts  18  and  18   a  after mounting the sleeves  45  and  45   a  to their place with the bearings  46  and  46   a . In order to secure the blades  24  with  25  and  24   a  with  25   a  to the shafts  18  and  18   a , hollow pins  48  and  48   a  are pushed inside them after mounting.  
         [0046]      FIG. 12  is a rear view of two rotating spot cultivator shafts  18  and  18   a . Shaft  8  is in its digging position with its stationary-cleaning blade  6  above the ground. Shaft  18   a  is in its upper position with its stationary-cleaning blade  6   a  in a cleaning position, both of them with stationary sleeves  45  and  45   a  around the cultivating shafts  18  and  18   a  and one set of cultivating blades  24  and  24   a  at their ends. The mass  31  is downward, lifting the stationary-cleaning blade  6  above the ground and pushing the stationary-cleaning blade  6   a  to clean the blades  24   a.    
         [0047]      FIG. 13  is a rear view of two rotating spot cultivator shafts  18  and  18   a . Shaft  18  is in its digging position with its cleaning blade  6  above the ground. Shaft  18   a  is in its upper position with its stationary-cleaning blade  6   a  in a cleaning position. The rotating cultivating shafts  18  and  18   a  are covered with stationary sleeves  45  and  45   a  around them. Two sets of cultivating blades are mounted at the ends of the rotating shafts at different depths  24  and  25  on shaft  18  and  24   a  and  25   a  on shaft  18   a . The mass  31  is downward, lifting the stationary-cleaning blade  6  above the ground and pushing the stationary-cleaning blade  6   a  to clean the blades  24   a  and  25   a.    
         [0048]      FIG. 14  is a rear view of a spot cultivator shaft mounted on a rolling gearbox  2 , in its rotating digging position with two sets of blades  24  and  25 . The upper set of blades  25  is rotating in one direction while the lower set of blades  24  is rotating to the other direction. The hollow shaft  51  above the upper set of blades  25  is covered with a stationary sleeve  45  around it. The in-corning shaft  4  by its pinion is rotating two gears, one of them  57  in one direction, and the other one  58  in the counter direction. The flange  29  is mounted to the rolling hollow shaft  15 , thus rolling the gearbox  2  with the hollow shaft in a vertical plane forward. The gear wheel  57  is connected to the hollow shaft  55  and rotates it in one direction, and gear wheel  58  is connected to the inner shaft  52  and rotates it to the counter direction while being held by the bearing  59 . The hollow shaft  51  is mounted to the hollow shaft  55  by flanges  54  to rotate with it. The upper set of blades  25  is mounted to the hollow shaft  51  by the hollow pins  48   b  around it and rotates with it in one direction. The stationary sleeve  45  is mounted to the rolling gearbox  2  by bolts  47  and connected at its other lower end to the bearing housing  46 . The inner shaft  56  is mounted to the inner shaft  52  and secured by the hollow pin  48   a , to rotate with it. The lower set of blades  24  is mounted to the inner shaft  56  and secured to it by the hollow pin  48 , and rotates with it in the counter direction to the upper set of blades  25 , thus preventing the mud from accumulating between them.  
         [0049]      FIG. 15  is a rear view of an auger digger  49  mounted on a rolling gearbox  2 , in it&#39;s digging position. The auger digger  49  comprises an auger flights  49   a  and blades  50 . The auger flights  49   a  are rotating in one direction while the lower set of blades  50  is rotating to the other direction. The in-coming shaft  4  by its pinion is rotating two gears, one of them  57  in one direction, and the other one  58  in the counter direction. The flange  29  is mounted to the rolling hollow shaft  15  (not shown here), thus rolling the gearbox  2  with the hollow shaft  51  with the auger flights  49   a  on it in a vertical plane forward. The gear wheel  57  is connected to the hollow shaft  55  and rotates it in one direction, and gear wheel  58  is connected to the inner shaft  52  and rotates it to the counter direction while being held by the bearing  59 . The hollow shaft  51  is mounted to the hollow shaft  55  by flanges  54  to rotate with it. The auger flights  49   a  are welded to the hollow shaft  51  and rotate with it in one direction. The inner shaft  56  is mounted to the inner shaft  52  and secured by the hollow pin  48   a , to rotate with it. The lower set of cutting blades  50  is mounted to the inner shaft  56  and secured to it by the hollow pin  48 , to rotate with it in the counter direction to the upper auger flights  49   a . The lower set of cutting blades  50  is cutting and pulverizing the soil while the upper auger flights  49   a , rotating to the other direction, prevent the accumulation of mud and lift the pulverized soil out from the hole.  
         [0050]      FIG. 16  is a side view of a post hole digger with an automatic cleaning blades in three positions of operation. The auger flights  49   a  are rotating in one direction while the lower set of blades  50  is rotating to the other direction. The counter rotation effect is explained in  FIG. 14 . The automatic stationary cleaning blades system is explained in  FIG. 1 . The words “mud” and soil are used herein substantially interchangeable; both contain some water, with mud being soil containing a relatively larger amoint of water which generally makes it more adherent to tool serfaces.