Sod handler
A sod handling method and a sod handling apparatus, in one embodiment the sod handling apparatus uses a pressure differential to hold a sod slab during sod transfer, other embodiments include a sod lift member for lifting sod, a sod transport mechanism for moving sod; a sod carriage for transporting sod, a sod bed positioning system for stacking sod, a system and method for checking sod quality as well as an apparatus and method of machine stacking sod to maintain the integrity of a sod stack.
This application claims priority from provisional patent application titled Sod Transfer Mechanism Ser. No. 60/628,053 filed Nov. 15, 2004.
FIELD OF THE INVENTIONThis invention relates generally to sod harvesting, and more specifically, to a sod harvester, a sod transfer mechanism, a sod lift mechanism, a sod transfer mechanism, a sod bed positioning system, a sod quality monitor, with the method including a method of transferring sod using a pressure differential to support a sod slab and a method of machine stacking sod slabs.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNone
REFERENCE TO A MICROFICHE APPENDIXNone
BACKGROUND OF THE INVENTIONThe use of a sod harvesting machine to cut slabs of sod from a sod field and then prepare the sod slabs for transport to a work site is known in the art. Once the sod slab is at the work site the sod slabs are laid down on top of the soil to enable the grass in the sod to take root in the soil. The use of sod handling machines is also known in the art. One way of handling the sod after the sod slab is cut from the field is to roll the sod slab into a cylindrical sod roll. One can then transport the sod to the work site where the sod is unrolled as the sod is laid down at the work site. Examples of sod handling apparatus are shown in our U.S. Pat. Nos. 6,783,318; 6,681,864; 6,364,027; and 6,296,063 which I hereby incorporated by reference.
Another way of handling a cut sod slab is to leave the sod slab in a flat or unrolled condition and pile the sod slabs on a pallet and then transfer the pallet with the sod slabs to a work site where the sod slabs are removed from a pallet and laid on the top soil.
Whether the sod slabs are rolled or left in a flat condition the sod slabs need to be transferred from one location to another location without destroying the integrity of the sod slabs.
One of the difficulties with handling sod slabs in an unrolled condition is that it is sometimes more difficult to transfer an unrolled or flat sod slab as opposed to a compact sod roll since the integrity of sod slab is affected by numerous factors including the type and amount of grass roots in the soil, the adherence of soil particles to each other and the adherence of the soil particles to the grass roots in the sod slab. In general care must be taken to ensure that integrity of the unrolled sod slab remains intact during the transport so that the sod slab can be laid down at the work site.
One method for lifting unrolled sod slabs uses a set of clamps that grasp the blades of grasses to transfer the sod slab in an unrolled condition. Such a device is shown in U.S. Patent application Publication U.S. 2005/0000704. In some cases it may be preferable to roll a sod slab into a cylindrical sod roll as the roll geometry increases the integrity of the sod for handling as well as allowing hooks or the like for piercing the sod roll to enable one to lift the sod roll. However, if the hooks are not properly applied to a roll of sod the sod roll can unwind or the sod can tear making it difficult to handle. Thus both methods of handling sod slabs either in a rolled condition or an unrolled condition are known in the art.
In contrast to the prior art devices and methods of moving sod the present invention includes a sod lift mechanism that enables one to lift and transport a sod slab from the sod field to the work site whether the sod slab is in a flat condition or in a rolled condition while maintaining the integrity of the sod slab. The various embodiments of the sod handling apparatus described herein include an apparatus for holding sod with a pressure differential across the sod slab, a sod transport mechanism; a sod carriage, a sod bed positioning system, a bump bed for lifting sod from a conveyor as well as use of such sod handling apparatus in sod machines such as sod harvesters. In addition the inventions include novel methods with one method including a method of machine stacking sod to maintain the integrity of a sod stack. The embodiments for transferring sod are shown and described with respect to a sod harvester although each of the various embodiments of the sod handling apparatus shown and described can be used in equipment other than sod harvesters.
SUMMARY OF THE INVENTIONBriefly, the invention includes a sod handling method and a sod handling apparatus. In one embodiment the sod handling apparatus uses a pressure differential to hold a sod slab during sod transfer, other embodiments include a sod lift member for lifting sod, a sod transport mechanism for moving sod; a sod carriage for transporting sod, a sod bed positioning system for stacking sod, a system and method for checking sod quality as well as an apparatus and method of machine stacking sod to maintain the integrity of a sod stack with each of the sod handling apparatus useable in a sod harvester.
BRIEF DESCRIPTION OF THE DRAWINGS
The sod harvester 10 includes a power source such as an agricultural tractor 11 which is used to power a sod cutting mechanism 12 and an elevator 13 for elevating the cut sod slabs from the sod cutting mechanism 12 to a sod transfer mechanism 14. Sod cutting mechanism 12 and the sod elevator 13 for elevating slabs of sod in a sod harvester which is either self propelled or pulled by an agricultural tractor are known in the art and are not described herein.
After the sod harvester cuts the sod slabs from the sod field the sod slabs are delivered to a conveyor 20 in the sod transfer mechanism 14 where a sod quality monitoring system including a sensor 19 determines if a sod slab is of proper sod quality. If the sod slab is of proper sod quality the sod transfer mechanism 14 transfers the sod slab to a pallet. The pallet, when loaded with sod, can be transferred to a truck by a fork lift and the pallet of sod can then be transferred to a work site.
A wheel 14d, which can be hydraulic raised or lowered, supports the rear of sod transport mechanism 14 with the front of the sod transfer mechanism 14 supported on the agricultural tractor 11. If desired, the sod transfer mechanism 14 could be cantileverly mounted or integrally mounted on an agricultural tractor or the like as well as used in other sod handling operations independent of sod harvester 10. A pallet storage and feed mechanism 18 as well as an air suction pump 50 can be included on sod transfer mechanism 14 when the sod transfer mechanism 14 is used as part of a sod harvester.
A reference to
A carriage 28 in conjunction with the suction housing 30 transfers the sod slab from conveyor 20 to a sod bed such as a sod pallet. The sod slabs, which are deposited on the sod bed can be maintained at a proper sod drop distance by a sod positioning system 21, shown in isolated view in
Thus, the sod harvester 10 includes a sod transfer mechanism 14 with the sod transfer mechanism 14 (shown in
In the embodiment shown in
As the sod slabs 15d and 15c are carried by conveyor 20 they pass under a sod quality monitor or sensor 19, which is mounted to frame 14a. Sod quality sensor 19 is located above conveyor 20 and prior to the sod pickup hood or suction housing 31 and determines whether a sod slab is in a stackable condition by determining the distance from the sensor to the top of the sod slab on conveyor 20 by emitting an acoustical signal indicated by dashed line 19a. If the sod slab is of proper sod stacking quality the top of the sod slab will have a continuous surface, i.e. the sod slab will be of proper length and not contain any tears or gaps. However, if the sod slab has a discontinuous surface or if the sod slab is to short or to long the sod slab is not of proper quality for stacking. Thus, if the distance from the sensor 19 to the sod slab remains substantially constant over a given length of sod the sod slab can be considered of proper quality for stacking. A processor, not shown, can measure and compare the expected relative displacement of the conveyor 20 and the expected length of a signal from sensor 19, which would indicate a continuous sod surface. If the signals are within determined ranges the sod slab is allowed to pass through the sod transfer mechanism 14. In an alternative embodiment, the sod processor can measure the length of time that a sod slab carried by conveyor 20 is proximate the sod quality sensor 19 and compared the measured time to the length of time a sod slab in a stackable condition would be proximate the sod quality sensor 19. If the times are within determined ranges the sod slab is allowed to pass through the sod transfer mechanism 14. Thus, processor comparisons can be done on either a time mode or a displacement mode and can also be done on-the-go.
In a time mode with a sod slab below stacking quality, the processor sends a rejection signal rejecting the sod slab if the length of time of a continuous surface from sensor 19 exceeds or is less than the length of time from a sod slab with a continuous surface i.e. the time a sod slab in stackable condition would be proximate the sod sensor 19. In the displacement mode with a sod slab below stacking quality, the processor sends a rejection signal rejecting the sod slab based on expected displacement of the conveyor while the sod monitor 19 determines the distance from the sod slab to the sod monitor 19 is within the determined range.
In either case, the sod quality sensor 19, generates a fault signal through a processor (not shown) that interrupts the sod transfer process. The interruption can be done by suppressing a signal to sod lift mechanism 37 and 38 thereby preventing sod pickup from conveyor 20 if the sod slab thereon is not in a stackable condition. Consequently, if the sod slab is not of proper sod quality the step of rejecting the sod slab from the stacking process of harvester 10 comprises allowing the conveyor 20 to continue to rotate and allow the sod slab, which is lacking in stacking quality, to fall off the end of the conveyor 20. One can thus automatically perform the process of sod slab quality monitoring and sod slab rejection without having to interrupt the operation of the conveyer 20 or have an operator interrupt the operation of the sod transfer process.
To further hold the carriage 28 on rail 40a a lower set of stops or wheels 41a′ and 41′ cooperate with the upper wheels 41a and 41 (see
Thus sod carriage 28 and the cable drive mechanism 48 as well as the sod carriage 28a and its cable drive mechanism provide for sod transfer from the sod conveyor 20 to selected drop off position above pallet 70 as illustrated in
The sod carriage 28, which is shown in isolated detail in
In order to position the carriage 28 at the proper position along the track rails the cable drive system 48 is powered by a hydraulic motor 72c located on one side of transport mechanism 14 and a free wheeling pulley 72 located on the opposite side of transport mechanism 14. Cable 75 is attached to carriage 28 by cable clamps 75a and 75b (
While the preferred embodiment comprises a cable mechanism with a cable drum to displace carriage 28 other carriage displacement mechanisms are envisioned such as a motor driven cog wheel on the carriage with a corresponding cog track for one or both of the rails. In either event the sod carriage 28 can be positioned in the proper position along the track rails for sod slab pickup or drop-off.
The carriage and rails for moving the suction housing 30 in the sod transfer mechanism 14 is shown in end view in
With the embodiment and method shown the sod slabs 15c and 15d can be elevated in an unrolled condition from conveyor 20 which brings the sod slabs 15c and 15d to a sod lift position immediately below the sod suction housings 30 and 31. In this postion a sod engagement step can take place between the suction housings and the sod slabs through bump beds in the sod lift mechanisms.
In the sod engagement step the sod suction housing 30 and the sod slab 15d are brought into engagement or close proximity with each other to enable a pressure differential across the sod slab 15d to generate a force sufficient to support the sod slab 15d thereunder as the sod suction housing 30 is moved about on track rails 40a and 40b. Similarly, the sod suction housing 31 and the sod slab 15c are brought into engagement or close proximity with each other to enable a pressure differential across the sod slab 15c to generate a force sufficient to support the sod slab 15c proximate suction housing 31 as the sod suction housing 31 is moved about on track rails 40c and 40d.
The suction of suction housing 30 and suction housing 31 is obtained by a suction from a vacuum pump 50 mounted on the sod transfer mechanism 14 that draws air through the suction housing or suction hoods 30 and 31. Pump 50 can have its own independent power source or can be powered from the agricultural tractor 11. A first flexible hose 51 extends from pump 50 to suction housing 30 and a second flexible hose 53 extends from pump 50 to suction housing 31. The flexible hoses allow the suction housing 30 and 31 to move in the sod transport mechanism while still maintaining a suction pressure that supports a sod slab thereunder. The suction housings 30 and 31 are identical to each other and are described in greater detail in
While the sod suction housing have been shown and described in a sod transfer mechanism in a sod harvester the suction housing can also be used in other sod handling equipment.
For example, one can unload a pallet of sod and lay the sod on a work site using the sod transfer mechanism with the suction housing. In this operation one could mount the movable housing 89 on a device such as a front end loader. The suction housing 82 can then be placed over a stack of sod slabs and one-by-one transfer the sod slabs from the sod pallet to the field without a user having to lift and place the sod slab in position.
While our sod handler apparatus have been shown and described in relation to the lift and transferring a flat sod slab i.e. in an unrolled condition the present invention can also be used to transfer sod in other forms. For example,
A reference to
Referring to
To illustrate the process of engagement between the suction housing 30 and 31 while minimizing power usage reference should be made to
The bump bed 35 is further revealed in
In order to appreciate the operation of the bump beds reference should be made to
A reference to
To lift the sod slab 15b from the conveyor the cycle is repeated with the link mechanism 103 and 107 rotating from the position shown in
Thus the invention includes a sod transfer system wherein conveyor 20 has a movable top sod support surface 20c′ for carrying a sod slab 15d, a bump bed 35 which is normally positioned below the movable top sod support surface 20c′ and a lift mechanism 37 for elevating the bump bed 35 and a lift mechanism 38 for elevating the bump bed 36 above top sod support surface 20c′ to thereby lift a sod slab free of the top support surface 20c′ with the lift mechanisms 37 and 38 if desired, to provide on-the-go elevation a sod slab from the conveyor to a sod pickup head located above the bump bed.
Positioned above the sod slab stack 77 is a sonic transducer 75 that measures the distance (indicated by dashed line) from the sonic transducer 75, which is affixed to frame 14a, to the top of the sod stack 77. Sonic transducer 75 connects to processor 9 through lead 75a. Processor 9 is mounted on the sod harvester frame 14a.
In operation of the sod bed positioning system 27 the sonic sensor 75 sends a signal (indicated by the dashed line) to the top of the sod stack 77. The signal is used by the processor 9 to control the elevation of the sod pallet 70 and thereby control the sod drop distance D (see
A reference to
A reference to
A reference to
As can be seen from
Thus one embodiment includes the method of machine stacking sod for transport comprising the steps of placing a first layer of sod slabs in a side-to-side position on a pallet to form a first layer of sod; and placing a second layer of sod slabs in a side-to-side position on top of the first layer of sod slabs with the second layer of sod slabs laterally offset from the first layer of sod slabs to thereby inhibit shifting a sod slab with respect to another sod slab. The process continues by laterally offsetting a further layer of sod with the further layer of sod slabs laterally offset in a direction opposite from the first layer of sod slabs and continuing to laterally offset an additional layer of sod by laterally offsetting the additional layer of sod in a direction normal to the first layer of sod slabs.
While the method shown and described with respect of
While the method of machine stacking has been described in
As a result of the sliding engagement of runners 96 with respect to frame 14a the carriage 28 and rails 40a and 40b can be laterally offset as a unit as shown by the dashed lines in
In order to shift the rails laterally, the rotatable stop 97 is pivoted counterclockwise as shown in
Thus the sod transfer mechanism 14 provides lateral shifting of sod slabs through sod shift mechanism 29 with laterally shiftable members that includes a track supported by runners 96 which are slidable along frame member 14a, a carriage 28 displaceable along the track with a sod holding apparatus secured to the carriage 28. A cable 75 secured to the carriage 28 with a rotatable cable drum 73 for winding the cable thereon to thereby controllable displace the carriage 28 secured to the cable 75 to thereby permit a transport of a sod slab supported by sod holding apparatus from a first location to a second location along the axis of the tracks.
The sod shift mechanism 29 provides for lateral displacement of the entire carriage and tracks so that the sod supported thereon can be laterality positioned with respect to a first layer of sod deposited by carriage 28 and the cable drive mechanism provides for shifting the sod drop off position along a rail axis by controlling the stop position of the carriage 28 and 28a.
Claims
1. A method of handling a sod slab in a sod harvester comprising:
- placing a suction housing over a sod slab;
- generating a pressure differential across the sod slab to support the sod slab proximate the suction housing; and
- transporting the sod slab to a different location while the sod slab is supported by the suction housing.
2. The method of claim 1 including elevating the sod slab toward an underside of said suction housing.
3. The method of claim 1 including elevating the sod slab from a moving conveyor.
4. The method of claim 1 including transporting the sod slab to a position beneath the suction housing and then bringing the sod slab and the suction housing proximate each other to thereby generate the pressure differential across the sod slab.
5. The method of claim 4 including the step of lifting the sod slab from a sod conveyor to bring the sod slab proximate the suction housing.
6. The method of claim 5 of including the step of lifting the sod slab from the sod conveyor without stopping the conveyor.
7. The method of claim 6 including the step of reducing the suction pressure to release the sod slab from the suction housing.
8. The method of claim 7 including the step of lifting a second sod slab from the conveyor.
9. The method of claim 8 including the step of placing the second sod slab proximate the sod slab.
10. A method of handling a sod slab comprising:
- generating a pressure differential across a sod slab sufficient to support the sod slab; and
- releasing the sod slab by reducing the pressure differential across the sod slab.
11. The method of claim 10 including the step of transporting the sod slab from a first location to a second location before releasing the sod slab.
12. The method of claim 10 including the step of generating the pressure differential across the sod slab by bringing a source of suction pressure proximate a top side of the sod slab.
13. The method of claim 11 including the step of lifting and transporting a further sod slab to a third location proximate said second location by generating a pressure differential across the further sod slab.
14. A method of transferring a sod slab from a first location to a second location comprising:
- generating a pressure differential across a sod slab; and
- moving the sod slab while supporting the sod slab with the pressure differential across the sod slab.
15. The method of claim 14 including the step of forming the sod slab into a sod roll before generating the pressure differential across the sod slab.
16. The method of claim 14 wherein the step of generating the pressure differential includes drawing air through the sod slab.
17. The method of claim 15 including the step of generating the pressure differential across the sod slab while the sod slab is transferred in a sod harvester.
18. A sod harvester comprising:
- a sod cutting mechanism;
- a sod conveyor; and
- a suction housing, said suction housing positionable with respect to a sod slab so as to create a pressure differential across the sod slab to thereby enable the pressure differential to support the sod slab proximate the suction housing.
19. The sod harvester of claim 18 including a bump bed for bringing the suction housing proximate the sod slab.
20. The sod harvester of claim 18 including a conveyor for positioning the sod slab beneath the suction housing.
21. The sod harvester of claim 18 including at least two suction housings for transferring sod slabs in said sod harvester.
22. The sod harvester of claim 18 including a track on said sod harvest for supporting said suction housing to permit movement of said suction housing from a sod pickup position to a sod drop-off position.
23. The sod harvester of claim 22 including a drive member for positioning said suction housing on said track.
24. The sod harvester of claim 18 including a sod pallet for transporting the sod slab to a work site.
25. The sod harvester of claim 18 including a positioning system for maintaining a distance from a top of the sod slab to a reference by lowering a pallet as the sod slab is stacked on the pallet.
26. The sod harvester of claim 18 including a suction pump located on said sod harvester.
27. The sod harvester of claim 26 including a flexible hose for connecting said suction housing to said suction pump to enable positioning of said suction housing.
28. The sod harvester of claim 18 wherein the sod housing includes a flat lift plate thereunder having a set of spaced apart apertures therein.
29. The sod harvester of claim 18 wherein the sod harvester includes a curved lift plate for lifting a sod slab in a cylindrical condition.
30. The sod harvester of claim 18 wherein the sod conveyor comprises a set of rotateable members with a bump bed extending between the set of rotateable members to enable a sod slab to be lifted from the sod conveyor without engaging the sod conveyor.
31. The sod transfer system of claim 45 including:
- a sod harvester having a sod cutting mechanism.
32. The apparatus of claim 63 including:
- a sod harvester having a sod cutting mechanism.
33. A sod harvester comprising:
- a sod cutting mechanism;
- a sod pickup hood;
- a sod quality sensor located prior to said sod pickup hood to determine whether a sod slab is in a stackable condition, said sod quality sensor suppressing sod pickup if the sod slab is not in a stackable condition.
34. The machine stacking apparatus of claim 88 including:
- a sod harvester having a sod cutting mechanism.
35. A sod transfer lift mechanism comprising:
- a suction source;
- a sod lift plate;
- a housing secured to said sod lift plate, said housing connected to said suction source so that as ambient air is drawn through the sod lift plate and into the housing a low pressure region is produced above a sod slab with the pressure sufficiently low so as to create a pressure differential across the sod slab to enable the housing to lift and transport the sod slab from one location to another solely through the use of the pressure differential across the sod slab.
36. The sod transfer lift mechanism of claim 35 including a base for rotatable supporting the housing.
37. The sod transfer lift mechanism of claim 35 wherein the sod lift plate comprises a flat surface.
38. The sod transfer lift mechanism of claim 35 wherein the sod lift plate has a plurality of spaced apart fluid inlet ports therein.
39. The sod transfer lift mechanism of claim 35 wherein the sod lift plate has a shape substantially equal to the shape of the sod slab carried thereon.
40. The sod transfer lift mechanism of claim 35 wherein the sod lift plate has a cylindrical shape for engaging a sod slab in a rolled condition.
41. The sod transfer lift mechanism of claim 35 wherein the sod slab has an underside of soil and a top side of blades of grass.
42. The sod transfer lift mechanism of claim 35 including a flexible hose connecting the sod lift plate to the suction source to permit transfer of the sod slab from one position to another.
43. A sod transporting apparatus comprising:
- a housing;
- a suction pump;
- a hood in fluid communication with said suction pump;
- a base plate having a set of fluid ports therein so that when a sod slab is positioned beneath said hood an air pressure differential generated across the sod slab by said suction pump is sufficient to hold the sod slab as the sod slab is transported.
44. The sod transporting apparatus of claim 43 including a rotatable mount for said hood to thereby rotationally position said hood.
45. A sod transfer system comprising:
- a conveyor;
- a bump bed, said bump bed normally positioned below said conveyor; and
- a lift mechanism for elevating said bump bed above said conveyor to thereby lift a sod slab thereon free of said conveyor.
46. The sod transfer system of claim 45 wherein the conveyor comprises a set of spaced apart conveyor belts and the bump bed is positioned between the set of spaced apart conveyor belts.
47. The sod transfer system of claim 45 wherein the lift mechanism includes a slider positioned between a pair of slider blocks to direct the slider along a lift axis.
48. The sod transfer system of claim 45 wherein the lift mechanism includes a drive shaft rotatable in a first direction to lift a sod slab from the conveyer and rotatable in an opposite direction to lift a further sod slab from the conveyor.
49. The sod transfer system of claim 45 wherein the bump bed includes a rail with beveled ends.
50. The sod transfer system of claim 45 wherein the conveyor moves in a first direction and the bump bed moves in a direction transvere to the first direction to thereby elevate the sod slab therefrom.
51. The sod transfer system of claim 45 wherein the conveyor includes three spaced apart conveyor belts and the bump bed includes a first set of rails positioned between an adjacent two of the three conveyer belts and a second set of rails positioned between a further adjacent two of the three conveyor belts.
52. The method of sod transfer comprising carrying a sod slab in a first direction and while the sod slab is being carried in the first direction terminating the carrying by elevating the sod in a second direction transverse to the first direction by lifting the sod slab from an underside of the sod slab.
53. The method of sod transfer of claim 52 where the sod slab is moved from a first direction to a second direction while the sod slab is being moved in the first direction.
54. The method of sod transfer of claim 52 including imparting sufficient momentum to the underside of the sod slab to throw the sod slab upward from the bump bed.
55. The method of sod transfer of claim 52 including the step of retracting the bump bed to enable a further slab of sod to carried into a lift position proximate the bump bed.
56. The method of stacking sod for transport comprising the steps of:
- placing a first layer of sod slabs in a side-to-side position on a pallet to form a first layer of sod slabs; and
- placing a second layer of sod slabs in a side-to-side position on top of the first layer of sod slabs with the second layer of sod slabs laterally offset from the first layer of sod slabs to thereby inhibit shifting the first layer of sod slab with respect to second layer of sod slabs.
57. The method of machine stacking sod of claim 56 including the step of continuing to laterally offset a further layer of sod with the further layer of sod slabs laterally offset in a direction opposite from the first layer of sod slabs.
58. The method of machine stacking sod of claim 56 including the step of continuing to laterally offset an additional layer of sod by laterally offsetting the additional layer of sod in a direction normal to the first layer of sod slabs.
59. The method of machine stacking sod of claim 56 wherein the placing a first layer of sod comprises lifting a sod slab with a suction housing and dropping the sod slab by releasing a suction pressure on the sod slab.
60. The method of machine stacking sod of claim 56 including laterally displaying the suction housing in a first direction and then laterally displacing the suction housing a second direction before releasing suction pressure on the sod slab.
61. The method of machine stacking sod of claim 56 including the step of laterally displaying the suction housing before placing a third layer of sod slabs.
62. The method of claim 56 wherein the method of sod stacking comprising machine stacking of the sod slabs.
63. An apparatus for maintaining a sod drop distance in a sod harvester comprising;
- a bed for supporting a stack of sod;
- a positionable member for raising and lowering the bed;
- a sensor positioned above said bed said sensor determine the distance to a top of said bed; and
- a processor for sending a signal to displace the bed to thereby maintain the sod drop distance.
64. The apparatus for maintaining the sod drop distance of claim 63 wherein the bed includes a pallet and the sensor comprises an acoustical sensor.
65. The apparatus for maintaining the sod drop distance of claim 63 including a hydraulic cylinder for raising or lowering the bed in response to a signal from the processor.
66. The apparatus for maintaining the sod drop distance of claim 63 wherein the positionable member includes a hydraulic cylinder having an extendible ram with a pulley thereon for engaging a flexible member having a first end connected to a frame and a second end attached to the positionable member.
67. The apparatus for maintaining the sod drop distance of claim 63 wherein the sod bed cantilevers outward to receive a sod pallet thereon.
68. The method of maintaining a top of a sod bed with a suitable sod drop range comprising;
- measuring a distance from a top of the sod slab to a reference; and
- displacing the sod bed in response to the measured distance to maintain the top of the sod bed within the suitable sod drop range.
69. The method of claim 68 including the step of measuring the distance from the top of the sod slab with a sonic transducer.
70. The method of claim 68 including the step of lowering the sod bed by extending or contracting an extendible ram on an hydraulic cylinder.
71. The method of claim 68 including the step of maintaining the sod bed in a horizontal condition to permit sod slabs to be dropped thereon.
72. The method of claim 68 including lowering a pallet on sod bed to the ground to allow the frictional forces between the sod pallet and the ground to pull the pallet free of the a pallet lift arm.
73. A method of claim 68 including the stacking of sod slabs in a sod harvester.
74. A sod transfer mechanism comprising;
- a track;
- a carriage displaceable along said track;
- a sod holding apparatus secured to said carriage
- a cable, said cable secured to said carriage;
- a rotatable cable drum for winding said cable thereon to thereby displace said carriage secured to said cable to thereby permit a transport of a sod slab supported by said sod holding apparatus from a first location to a second location.
75. The sod transfer mechanism of claim 74 wherein the sod holding apparatus includes a suction housing.
76. The sod transfer mechanism of claim 74 wherein the track comprises a set of parallel rails and said sod holding apparatus comprises a carriage having a set of wheels for rolling supporting said sod holding apparatus thereon.
77. The sod transfer mechanism of claim 74 including a displacement mechanism for laterally shifting said track.
78. A method of transferring sod from a first location to a second location comprising;
- securing a sod slab to a carriage;
- moving the carriage with the sod slab to a different location along a track;
- stopping the carriage; and
- releasing the sod slab from the carriage.
79. The method of claim 78 wherein the sod slab is secured to an underside of the carriage by a pressure differential across the sod slab.
80. The method of transferring sod of claim 78 wherein the carriage is moved from the first location to the second location by winding a cable around a cable drum.
81. The method of transferring sod of claim 78 wherein the carriage is maintained on the track by a set of rollers.
82. The method of transferring sod of claim 78 wherein the track is shifted laterally prior to releasing the sod slab from the carriage.
83. The method of maintaining sod stack quality during a cutting and stacking process in a sod harvester comprising;
- cutting a sod slab;
- directing the sod slab proximate a sod quality sensor; and
- removed the sod slab from a stacking process if the sod slab has a discontinuous surface.
84. The method of claim 83 wherein the sod quality sensor comprises an acoustic sensor that measures the distance from a top surface of the sod slab to the sod quality sensor.
85. The method of claim 83 where the length of time that the sod slab is proximate a sod quality sensor is compared to the length of time a sod slab in stackable condition would be proximate the sod quality sensor and rejecting the sod slab if the length of time of the sod slab is below the length of time the sod slab in stackable condition would be proximate the sod quality sensor
86. The method of claim 83 wherein a signal is sent to a sod lift mechanism to stack the sod slab.
87. The method of claim 85 wherein the step of directing a sod slab beneath a sod quality sensor comprises carrying the sod slab on a conveyor and the step of rejecting the sod slab from the stacking process comprises allowing the sod slab to fall off an end of the conveyor by suppressing a signal to the sod lift mechanism to stack the sod slab.
88. A machine stacking apparatus comprising:
- a sod pickup member for transporting a sod slab along a first axis, said sod pickup member controllable to deposit a sod slab at specified locations along said first axis; and
- a slide for supporting said sod pickup member, said slide laterally displaceable with respect to the first axis to thereby enable the sod pickup member to deposit a further sod slab along a second axis with the second axis laterally offset of the first axis.
89. The machine stacking apparatus of claim 88 including at least two sod pickup members supported by said slide.
90. The machine stacking apparatus of claim 88 including a stop for preventing said slide from being displaced with respect to a frame.
91. The machine stacking apparatus of claim 88 wherein the sod pickup member includes a cable drive.
92. The machine stacking apparatus of claim 88 wherein the sod pickup member includes a suction hood for holding said slab.
Type: Application
Filed: Mar 30, 2005
Publication Date: May 18, 2006
Inventors: Michael Tvetene (South Billings, MT), Donald Tvetene (Billings, MT), Gregg Tvetene (Billings, MT)
Application Number: 11/096,242
International Classification: A01B 45/04 (20060101);