Patent Application
20220053683
The present patent application claims priority to Australian patent applications AU2020903008 filed Aug. 22, 2020 and AU2020904205 filed Nov. 16, 2020, all of which are incorporated herein by reference in their entirety.
Utility tractors are used widely for various jobs around farms. They tend to be in the small to medium size category and various implements and attachments can be added to them to provide additional functionality as needed.
Typically implements can be added on the rear of the utility tractor by connecting to a three point linkage, to the rotary power take off (PTO) mechanism if power is required to use the implement and to the hydraulic outlets if hydraulics are also required for the implement. Some implements, such as a carry all, or certain hay handling equipment or tow ball attachments etc do not need the PTO. However others do, for example slashers, mowers, spreaders, rotary rakes, chippers, etc. Some implements also require hydraulic connections, such as hay bale or silage handling equipment, post hole diggers, seeders, some grader blades, some harrows, backhoes, etc.
Many times a land owner will want to use a utility tractor for multiple jobs at once or within a short period or at a similar area on the farm and so may wish to do so without having to return to the tractor storage area on the farm to swap over implements. There is currently no easy solution to this problem. Similarly, many times a land manager will have to take multiple vehicles to a location or use the tractor to tow a trailer to the location and then return for an implement also needed at that location before commencing work. Despite the fact that the three point linkage was invented in the 1920's, to the best knowledge of the inventor, there is currently no workable solution to these problems.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge. The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge.
According to a first aspect of the invention, there is provided an apparatus for attachment to a tractor the apparatus comprising a primary implement and at a first end, connections suitable to connect to the three point linkage of the tractor and at a second end, connections suitable to connect to the three point hitch points of a secondary implement. In some embodiments, the primary implement comprises a platform for carrying agricultural tools or equipment.
As used herein, the term ‘primary implement’ refers to the implement which is part of the apparatus according to the invention and therefore connected via the first end of the apparatus to the tractor. The term ‘secondary’ implement’ refers to an implement which is connected to the second end of the apparatus according to the invention.
Some embodiments of the invention further comprise a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off, of the tractor through to the secondary implement. In some of the embodiments which comprise a power-take off extension, the power take off extension comprises a housing, and an attachment at each end for connection to, at the first end, the tractor power take-off for example, via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver for example via a second PTO drive shaft attachment. The power take-off extension may be located in any suitable position on the apparatus according to the invention, but in some preferred embodiments it is located underneath the apparatus of the invention for example underneath the primary implement.
In some embodiments of the invention, there is further provided a stabiliser which comprises one or more of a wheel or a stand or one or more legs. The stabiliser may also be releasably fixed to the underside of the apparatus so that it can be removed when not required. It may also comprises a hinge mechanism so that it is able to be folded up out of the way.
The connections of the apparatus of the invention may in some embodiments comprises a coupler to facilitate the connection of the tractor three-point linkage to the implement.
In another aspect of the invention, there is provided a kit of parts for retrofitting to a primary implement to manufacture an apparatus for attachment to a tractor, the kit comprising: an upper link, two lower links, two side stabiliser bars, and a housing comprising a PTO extension and attachment points for attachment of the housing to a frame of the primary implement.
One aspect of the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising an upper link and two lower links.
The frame of the apparatus according to certain aspects of the invention is the part of the apparatus to which is fixed (for example by welding or mechanical means) at least one of (a) the connections suitable to connect to the three point linkage of the tractor (such as three point hitch points) and/or (b) the connections suitable to connect to the three point hitch points of a secondary implement (such as a three point linkage or a coupler) or both. As such, the frame may in fact pre-exist in a currently known primary implement if it is possible to so attach one or both of these connections. It is intended that embodiments to which such connections are directly attached to a pre-existing type of primary implement are encompassed within the scope of the present invention.
Throughout this specification (including any claims which follow), unless the context requires otherwise, the word ‘comprise’, and variations such as ‘comprises’ and ‘comprising’, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
It is convenient to describe the invention herein in relation to certain preferred embodiments. However, the invention is applicable to a wide range of embodiments and it is to be appreciated that other constructions and arrangements are also considered as falling within the scope of the invention.
As an example, the illustrations and descriptions herein sometimes refer to a three point linkage on the rear of a tractor. However, some modern tractors may have a three point linkage on the front of the tractor and some also have a PTO drive on the front of the tractor. The present invention is equally applicable to such front mounted three-point linkages and PTO drives as it is to those mounted on the rear of the tractor.
As a further example, a number of the embodiments described herein are variations on a theme based on carry-all type implements as the primary implement, however it will be appreciated that the invention may comprise many other types of implements that do not need the PTO drive which can pass through and be connected to the secondary implement on the second side of the apparatus of the invention. Examples may include, a grader blade, bed former, a box blade scraper, dirt scoop, harrows, a ripper, a rotary hoe, a plough, a finishing mower, a flail mower, landscape rakes, a spreader, an s-tine cultivator, a tillage implement, hay handling implements and so on.
Various modifications, alterations, variations and or additions to the construction and arrangements described herein are also considered as falling within the ambit and scope of the present invention.
The invention will first be described in general terms in order to demonstrate examples of the types of uses to which it can be put. More detail about certain dimensions and preferred requirements for certain embodiments will then be set out.
The following terms have the following means within this document:
According to one aspect of the invention there is provided an apparatus for attachment to a tractor comprising a primary implement and at a first end, connections suitable to connect to the three point linkage of the tractor and at a second end, connections suitable to connect to the three point hitch points of a secondary implement. In this specification, a primary implement is the implement which forms part of the apparatus of the invention and a secondary implement is an implement which can be attached to the second side of an apparatus of the invention via the three point linkage.
Connectors for three point linkage systems on the rear of tractors are known and modifications of them suitable for the apparatus of the invention are depicted in the figures herein. It should be noted that a connector suitable to connect to a three point hitch or linkage may also be a coupler which is a device which facilitates the connection of tractor three-point linkage to an implement. In some instances, such couplers enable the land manager to hitch and unhitch without leaving the tractor operator's seat. Suitable examples of couplers may for example include: U frame couplers, A frame couplers, link couplers, and bar couplers.
Some embodiments of the invention comprise a power take off extension which enables transfer of rotational power from the power take off from the tractor through to the secondary implement. Such an extension is preferably suitably housed so as to reduce risk of damage from the rotating PTO shaft. In some embodiments the PTO extension shaft may be placed underneath the primary implement (for example if it is a carry-all), but it may be placed at any suitable position which enables the primary and secondary implements to function as required.
Some embodiments of the invention further comprise a stabiliser for the primary implement which may for example be a wheel or a stand or one or more legs. Such stabilisers are preferably able to be folded up out of the way or removed when not required. Wheels used as part of a stabiliser are preferably able to swivel to ensure they do not drag when the tractor changes direction etc.
In some embodiments the secondary implement is fixed relative to the primary implement and so can not move relative to it. In some embodiments, limited movement, for example lateral is possible. In some embodiments the secondary implement may move relative to the primary implement passively (for example whilst traversing a slope etc if it has its own wheels), but not actively (ie under power). In some embodiments the secondary implement may be raised or lowered relative to the primary implement. This may be effected by any suitable means, for example hydraulics, for example by hydraulic arms attached to lower links forming part of the three point linkage.
Apparatus 120 comprises a carry all as primary implement and therefore comprises a platform 121, frame elements 122, brace 123 and three point linkage attachment at the rear shown generally at 140. Three point linkage 140 on apparatus 120 comprises upper link 141 and lower links 142 and stabiliser bars 143 to restrict lateral movement of lower links 142 in use. Lower links 142 are adjustable in length, in this case by telescopic movement of two components and a series of holes 146 and pin 144 which is used as a stopper through holes in each component at a selected length. Similarly upper link 141 is adjustable in length, in this instance by the depicted threaded area 141a about which the distal section 141b of link 141 is rotated to shorten or lengthen the overall length of link 141. There are many other simple ways to enable adjustability of the length of the upper and lower links of the three point linkages of the invention.
In
A typical example of a PTO drive shaft attachment is shown generally at 300 in
Properties of PTO drive shaft attachments, such as universal joints and the ability to continue to transfer rotational force irrespective of changes in distance or angle between the two PTO drive points are important to the operation of those embodiments of the invention in which the user wishes to connect a secondary implement which requires PTO rotational force. In some embodiments it may be necessary to have one or more additional universal joints between the tractor and the apparatus of the invention in order to facilitate the full range of required movement of the primary implement or the secondary implement with respect to the tractor. In some embodiments, one or more additional specialised PTO drive shaft attachments may also be required between the primary and secondary implements.
Returning to
The apparatus of this embodiment further comprises an apparatus PTO drive 155 which as described above can be connected to the PTO drive on the tractor via a PTO drive shaft attachment and therefore transmit rotational force (via male connector 150) originating from the tractor PTO drive to the secondary implement to be attached (via a second PTO drive shaft attachment) at the second side of the apparatus of this embodiment of the invention.
In this embodiment, the primary implement comprises a platform section 121 to which the three point linkage elements are attached. In this embodiment, there is no method of raising and lowering the secondary implement separately from the primary implement. Instead it is raised and lowered with the primary implement via their attachments at three point linkages 130 and 140 respectively. This underscores the need to have strong attachments and supporting framework on the apparatus (in this example, the primary implement is a carry-all).
Apparatus of the invention that comprise primary implements with a platform such as a carry all as depicted in
In
Some variants of this embodiment may comprise a stabiliser system to provide further stability to the apparatus structure for raising and lowering the secondary implement. For example, it may comprise one or more wheels, preferably which are able to swivel under the primary implement. In some preferred embodiments, such wheels can be folded up out of the way or removed when not required. In other embodiments, fold down or slide down stands or legs may be used on the primary implement to provide such stabilisation. Again, such stabilisers may also be able to be removed when not in use. An example of the use of such stabilisation may for example be when the secondary implement is one that is used in a stationary position, such as a wood chipper (see
In other embodiments, better operational efficiency may be gained by having the primary and secondary implements at different heights. For example, when slashing a paddock (slasher as secondary implement) or mowing grass (mower as secondary implement), it would be preferable to have the primary implement at a higher level than the secondary implement and therefore out of the way so that it doesn't interfere with the pasture or grass as it enters the slasher or mower which must be positioned lower to the ground. This is taken into account in some embodiments that do not have the ability to separately raise and lower the secondary implement so that the secondary implement is fixed at a higher or lower position than the primary implement. See for example
In this embodiment lower links 542 are stabilised by stabilisers 530 and are also moveable up and down by virtue of hydraulic rams shown schematically as boxes 546, and again, hydraulic extension cables 547 are shown (in this embodiment placed under the implement) with connectors 548 for connecting to the hydraulic hoses on the tractor, potentially via extension cables. This variant of this embodiment also comprises wheels 590 which are on swivels (not shown) to provide further stability. These wheels may be able to be folded up or removed when not in use.
In some embodiments, the three point hitch points on the first side and the three point hitch linkage on the second side of the primary implement are independently adjustable so as to raise or lower the three-point hitch independently from its normal operation. Such adjustability may be achieved by any suitable means, for example by a series of holes in a frame to which the three point hitch or linkage components can be releasably fixed so that the frame (and thereby the three point hitch) can be set at different levels and then fixed in place, for example with a pin, or bolted in place.
In some embodiments the primary implement is an earth moving implement, such as a grader blade, a bed former, a box blade scraper, dirt scoop, harrows, a ripper, a plough or a tillage implement. In these embodiments it may be useful to have a second earth moving implement as the secondary implement. For example a ripper as primary implement to turn up the soil followed by a grader to move it sideways or a smudge bar to flatten it. In some embodiments it may be useful to have a different type of secondary implement, such as a set of harrows to rake out freshly ploughed earth, or spread manure across it.
In some embodiments of the invention, the three point hitch points on the apparatus of the invention used to connect to the tractor three point linkage are fixed at a lower level so that the implement, when hitched, sits at a greater height above the ground than would normally be the case for another implement. This makes it easier for an operator to ensure adequate height distance between the primary implement and the secondary implement as for example required in the two implementations depicted in
One example implementation of the kit according to the invention is in relation to retrofitting such a kit to a pre-existing carry-all. According to this example, a PTO drive extension is attached to the underside of the carry-all. The PTO drive extension is preferably attached with steel supports that hold the PTO extension in place and which are attached to the frame of the carry-all. Such steel supports may be of any suitable type provided that they can hold the PTO extension so that it can rotate but not otherwise move relative to the frame of the carry-all. In addition, the PTO extension must be covered with a safety cover or shroud to ensure that the rotating PTO extension drive does not inadvertently catch on something, including human body parts. In some preferred embodiments, the safety cover comprises the steel supports which are accessible and able to be fixed (such as bolted or welded) to the frame of the carry-all. In these embodiments the retrofitting process is made easier as it is simply a matter of attaching a single piece of equipment to the underside frame of the carry-all. A typical carry-all will already have three-point hitching points for the three-point linkage of the tractor to connect to. However, in order to make it operable as an apparatus with primary implement according to the invention, an additional three-point linkage must be added to the second side of the carry-all so that it can hitch to three point hitch points on a secondary implement. In some preferred embodiments, the apparatus three point linkage can be pre-assembled for ready fixing (such as by bolts or welds) to the frame of the carry-all. In some embodiments, there are also provided further supports to be fixed (bolted or welded) on to the carry-all frame to enable more sturdy attachment of the apparatus three point linkage. In some embodiments, further hydraulic equipment must also be added in order to enable the secondary implement to be raised and lowered independently of the primary implement.
The carry all embodiments of the invention increase the usefulness of a tractor in many ways. Tractors usually have little room to carry tools or other items on or about them or in the cab, if there is one. By using a carry all embodiment of the current invention, a land manager can turn his or her utility tractor into a utility vehicle (ute) as well. It will enable the land manager to carry various items or tools in the carry all, whilst maintaining the ability to transport and use a secondary implement. So for example, the land manager could use the invention to carry fencing tools and wood cutting tools to a part of the farm where fencing repair and fire wood collection is required and tow a trailer to collect the firewood or a splitter to split it and then load it in the carry all. This could be done with the embodiment of example 7, or any of the other embodiments, by attaching a tow ball attachment to the three point linkage on the second end of the apparatus.
The interposition of an apparatus of the invention with primary implement between the tractor and the secondary implement can give rise to problems for the operator in seeing and therefore fully using the secondary implement. For example, if using the implement whilst reversing the tractor or even to maintain a visual check that operations are working. In some embodiments the apparatus or its primary implement is fitted with a camera so that the operator can obtain a better view of what is occurring. The video screen can be placed in any suitable position, but in some preferred embodiments it is placed in the rear of the tractor so that the operator can glance between it and the actual rear view visible from his or her seat on the tractor.
The following section sets out more detail in relation to preferred dimensions and requirements for linkages and hitches on apparatus according to the invention. It should be noted that the dimensions provided below may need to vary in case of specialised implements. It should also be noted that some of the dimensions and requirements apply only to those embodiments comprising a mechanism to raise and lower a secondary implement relative to the primary implement. It will be appreciated that the three point linkage used on the apparatus of the invention to attach to a secondary attachment can be of any of the known types, as set out in the below table.
Certain specialised implements or farming operations that require narrow spacing require special consideration for the three-point linkage (1N, 2N, 3N and 4N).
The hitch points on secondary implement 1440 comprise a mast 1410 which provides the location of the upper hitch point on the implement. The height of mast 1410 (signified by distance 1414) is the vertical distance between the upper hitch point and the common axis of the lower hitch points. The upper link 1401 of apparatus 1400 attaches to the mast 1410 of secondary implement three point hitch by passing upper hitch attachment 1412 (pin, usually detachable and forming part of the upper link assembly, by which an upper link is secured) through a first hole in mast 1410, then through the hole defined by upper hitch point 1403 then through the second hole in mast 1410 as shown and securing it with linchpin 1411 (pin, usually fitted with a spring-retaining device, by which an articulated connection is retained in position).
Lower links 1402 on the three point linkage of apparatus 1400 are attached to the hitch points 1440 of the secondary implement by passing the holes defined by lower hitch points 1404 over lower hitch attachment 1413 (pin, or clevis and pin, usually attached to the implement, by which a lower link is secured) on hitch points 1440 and securing it with linchpin 1411 (pin, usually fitted with a spring-retaining device, by which an articulated connection is retained in position). The distance between the shoulders of the lower hitch pins, against which the sides of the lower link ball joints abut is referred to herein as lower hitch point span 1415. The distance from the centreline of the linchpin hole to the shoulder of the hitch pin is referred to herein as the linchpin hole distance 1416.
Lower hitch point height 1503 is the height of the centre of the lower hitch points above the ground level when they are fully lowered using the full extent of manual adjustment for example, provided in the lift rods (in embodiments which comprise them), in conjunction with the movement range, and when the lower hitch point axis is maintained horizontal to the ground in a transverse plane. For reasons of interoperability, usability and safety, the lower hitch point height 1503 is preferably up to a maximum of 200 mm for category 1N and 1 hitches, and up to a maximum of 203 mm for category 2N, 2, 3N, 3, 4N and 4 hitches.
The levelling adjustment 1504 is the movement allowing inclination of the secondary implement, measured vertically and with one lower link horizontal, so that either lower hitch point can be moved higher or lower than the other. For reasons of interoperability, usability and safety, the levelling adjustment 1504 is preferably at least 75 mm for a category 1N hitch, a minimum of 100 mm for category 1, 2N and 2 hitches, at least 125 mm for category 3N and 3 hitches and at least 150 mm for category 4N and 4 hitches.
For embodiments which comprise the ability to raise or lower the secondary implement relative to the first, the movement range 1505 is the vertical movement of the lower hitch points corresponding to the power travel of the lift, excluding any adjustment in the lift rod linkage. For reasons of interoperability, usability and safety, the movement range 1505 is preferably at least 610 mm for category 1N and 1 hitches, at least 650 mm for category 2N and 2 hitches, at least 735 mm for category 3N and 3 hitches, and at least 760 mm for category 4N and 4 hitches. Note that movement range for PTO power above 65 kW should be at least 700 mm.
The transport height 1506 is the total height of the lower hitch points above the ground using the full extent of manual adjustment provided (for example in the lift rods if provided) in conjunction with the movement range, with the lower hitch point axis maintained horizontal to the ground in a transverse plane. For reasons of interoperability, usability and safety, the transport height 1506 (lower hitch point axis to be horizontal throughout) should be at least 600 mm for a category 1N hitch, at least 820 mm for a category 1 hitch, at least 950 mm for category 2N and 2 hitches, at least 1065 mm for category 3N and 3 hitches and at least 1200 mm for category 4N and 4 hitches.
For use with tractors of particularly large size or particularly large sized tyres, the lower hitch point clearance 1507 is the clearance, expressed as a radial dimension, from the lower hitch point axis to the outside diameter of the tyre, mudguard or other part of the tractor, measured in a longitudinal vertical plane with the implement raised to transport height and all side-sway prevented. For reasons of interoperability, usability and safety, the lower hitch point clearance 1507 should be at least 90 mm for a category 1 hitch, 100 mm for category 1, 2N, 2, 3N, 3, 4N, and 4 hitches.
It should be appreciated that the term ‘pitch’ refers to the angle of the mast to the vertical, considered positive when viewed anticlockwise from the left-hand side of the tractor. The mast adjustment is the usable range of pitch of the mast from a vertical plane, measured at the maximum and minimum heights of the lower hitch points above the ground between which the mast, at the specified mast height, can be adjusted to any inclination between +5° and −5° from the vertical for categories 1, 2N, 2, 3N, 3, 4N and 4, and between the vertical and 10° to the vertical towards the rear for category 1N. For reasons of interoperability, usability and safety, the mast adjustment height should for a category 1N hitch have a lowest position of no more than 200 mm and a highest position of at least 420 mm, and for a category 1 hitch, have a lowest position of no more than 200 mm and a highest position of at least 508 mm, and for category 2N and 2 hitches, have a lowest position of no more than 200 mm and a highest position of at least 610 mm, and for category 3N and 3 hitches, have a lowest position of no more than 230 mm and a highest position of at least 660 mm, and for category 4N and 4 hitches, have a lowest position of no more than 255 mm and a highest position of at least 710 mm.
The torsional free float distance is the vertical distance over which either of the lower hitch points can move freely relative to the other to allow the implement to roll, with lower links initially horizontal. It is important that the torsional free float may be able to be blocked and for reasons of interoperability, usability and safety, should be a minimum of 60 mm for hitch categories 1N, 1, 2N and 2, a minimum of 75 mm for hitch categories 3N, 3, 4N and 4.
The transport pitch is the pitch reached by the mast when lifted to standard transport height from a position with lower links horizontal and mast vertical. It is important that the upper link point arrangements are such that transport pitches of −3° to +3° and +10° to +15° can be achieved at the standard mast height.
For reasons of interoperability, usability and safety, the diameter of the hitch pin hole on the upper hitch points 1802 for the hitch on an apparatus according to the invention for categories 1N or 1 hitches is preferably in the range 19.1 to 19.5 mm and more preferably 19.3 mm; and for category 2N or 2 hitches is preferably in the range 25.7 to 25.9 mm and more preferably 25.7 mm, and for category 3N or 3 hitches is preferably in the range 32 to 32.25 mm and preferably 32 mm, and for category 4N and 4 hitches is preferably in the range 45.2 to 45.5 mm and more preferably 45.2 mm.
For reasons of interoperability, usability and safety, the width of the ball on the upper hitch points 1803 for the hitch on an apparatus according to the invention for categories 1N or 1 hitches is preferably in the range 43.5 to 44 mm and more preferably 44 mm; and for category 2N or 2 hitches is preferably in the range 50.5 to 51 mm and more preferably 51 mm, and for category 3N or 3 hitches is preferably in the range 50.75 to 51 mm and preferably 51 mm, and for category 4N and 4 hitches is preferably in the range 63.5 to 64 mm and more preferably 64 mm.
For reasons of interoperability, usability and safety, the diameter of the hitch pin hole for the lower hitch points 1804 for the hitch on an apparatus according to the invention for categories 1N or 1 hitches is preferably in the range 22.4 to 22.65 mm and more preferably 22.4 mm; and for category 2N or 2 hitches is preferably in the range 28.7 to 29 mm and more preferably 28.7 mm, and for category 3N or 3 hitches is preferably in the range 37.4 to 37.75 mm and preferably 37.4 mm, and for category 4N and 4 hitches is preferably in the range 51 to 51.5 mm and more preferably 51 mm.
For reasons of interoperability, usability and safety, the width of the ball for the lower hitch points 1805 for the hitch on an apparatus according to the invention for categories 1N or 1 hitches is preferably in the range 34.5 to 35 mm and more preferably 35 mm; and for category 2N or 2 hitches is preferably in the range 44.5 to 45 mm and more preferably 45 mm, and for category 3N or 3 hitches is preferably in the range 44.5 to 45 mm and preferably 45 mm, and for category 4N and 4 hitches is preferably in the range 57 to 57.5 mm and more preferably 57.5 mm.
For reasons of interoperability, usability and safety, the lateral distance from the lower hitch point to the centreline of the implement according to the invention 1806 for a category 1N hitch it is preferably in the range 207 to 229 mm and more preferably 218 mm; and for a category 1 hitch it is preferably in the range 341 to 377 mm and more preferably 359 mm, and for category 2 or 3N hitches it is preferably in the range 413 to 457 mm and preferably 435 mm, and for category 3 and 4N hitches it is preferably in the range 479 to 530 mm and more preferably 505 mm and for a category 4 hitch, it is preferably in the range 581 to 642 mm and preferably 612 mm. Note that if a U frame coupler is used in conjunction with a 4N hitch then preferably this dimension should be in the range 464 mm to 514 mm and more preferably about 489 mm.
For reasons of interoperability, usability and safety, the lateral movement of the lower hitch point 1902 for the hitch on an apparatus according to the invention for a category 1N hitch it is preferably in the range 50 to 55 mm and preferably at least 50 mm, and for category 1 or 2N hitches it is preferably in the range 100 to 110 mm and more preferably about 100 mm; and for category 2, 3N, 3, 4N and 4 hitches it is preferably in the range 125 to 138 mm and more preferably at least 125 mm. Note that in some applications (for example for a wagon hitch or with wide tyre sizes on the tractor), it may be necessary to reduce these dimensions by up to 35 mm. Note that in some specialised applications in which the tractor has a track width of less than or equal to 1150 mm, then this dimension may be reduced for category 1 and 2N hitches to a range of preferably 50 to 55 mm and more preferably at least 50 mm.
The horizontal convergence distance 2005 is important for the horizontal stability of implements. If the horizontal convergence distance is too large, the lateral stability of directional implements is decreased. If the horizontal convergence distance is too short, non-directional implements, such as harrows, easily find equilibrium positions asymmetric to the tractor. For many implements, especially long multi-row ones, this leads to decreased quality of work. Preferably, the horizontal convergence distance should be 1700 mm to 2400 mm for category 1 and 1N hitches, 1800 mm to 2400 mm for category 2, 2N and 3N hitches, 1900 to 2700 mm for category 3 hitches, 1900 to 2700 mm for category 4N hitches and 1900 to 2800 mm for category 4 hitches.
The vertical convergence distances is important for stable working conditions and make it possible to reduce the influence of tractor movements (pitching, rolling, turning) on connected implements and to provide for wide interchangeability of tractors and implements designed by different producers. To achieve these properties for a linkage, the vertical convergence should be not less than 0.9 times the tractor wheelbase and preferable at least the same length as the tractor wheelbase.
One aspect of the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links.
In another aspect of the invention, there is provided an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take-off of the tractor through to the secondary implement, the power take off extension comprising a housing, and an attachment at each end for connection to, at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment.
In one aspect of the invention, there is provided an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and an attachment at each end for connection to, at the first end the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment.
In yet another aspect, the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment.
In one aspect, the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement.
In another aspect, the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; a the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement.
In another aspect of the invention, there is provided an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement.
In another aspect of the invention, there is provided an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use and each lower link connected to a lift rod; at the second end, a hydraulic mechanism to raise or lower the lift rods connected to the lower links and thereby raise or lower the primary implement three point linkage; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement.
Another aspect of the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use and each lower link connected to a lift rod; at the second end, a hydraulic mechanism to raise or lower the lift rods connected to the lower links and thereby raise or lower the primary implement three point linkage; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement; wherein the vertical convergence is at least 0.9 times the tractor wheelbase.
In yet another aspect, the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use and each lower link connected to a lift rod; at the second end, a hydraulic mechanism to raise or lower the lift rods connected to the lower links and thereby raise or lower the primary implement three point linkage; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement; wherein the horizontal convergence distance is selected from 1700 mm to 2400 mm for category 1 and 1N hitches, 1800 mm to 2400 mm for category 2, 2N and 3N hitches, 1900 to 2700 mm for category 3 hitches, 1900 to 2700 mm for category 4N hitches and 1900 to 2800 mm for category 4 hitches; and wherein the vertical convergence is at least 0.9 times the tractor wheelbase.
Another aspect of the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement; at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use and each lower link connected to a lift rod; at the second end, a hydraulic mechanism to raise or lower the lift rods connected to the lower links and thereby raise or lower the primary implement three point linkage; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement; wherein, in relation to the three point linkage at the second end of the apparatus: the lower hitch point height is selected from: a maximum of 200 mm for category 1N and 1 hitches, and a maximum of 203 mm for category 2N, 2, 3N, 3, 4N and 4 hitches; the levelling adjustment is selected from: at least 75 mm for a category 1N hitch, at least 100 mm for category 1, 2N and 2 hitches, at least 125 mm for category 3N and 3 hitches and at least 150 mm for category 4N and 4 hitches; the movement range is selected from: at least 610 mm for category 1N and 1 hitches, at least 650 mm for category 2N and 2 hitches, at least 735 mm for category 3N and 3 hitches, and at least 760 mm for category 4N and 4 hitches; the transport height is selected from: at least 600 mm for a category 1N hitch, at least 820 mm for a category 1 hitch, at least 950 mm for category 2N and 2 hitches, at least 1065 mm for category 3N and 3 hitches and at least 1200 mm for category 4N and 4 hitches; the lower hitch point clearance is selected from at least 90 mm for a category 1 hitch, and 100 mm for category 1, 2N, 2, 3N, 3, 4N, and 4 hitches; the mast adjustment height is selected from: for a category 1N hitch a lowest position of no more than 200 mm and a highest position of at least 420 mm, for a category 1 hitch, a lowest position of no more than 200 mm and a highest position of at least 508 mm, for category 2N and 2 hitches, a lowest position of no more than 200 mm and a highest position of at least 610 mm, for category 3N and 3 hitches, a lowest position of no more than 230 mm and a highest position of at least 660 mm, for category 4N and 4 hitches, a lowest position of no more than 255 mm and a highest position of at least 710 mm; the torsional free float is selected from: at least 60 mm for category 1N, 1, 2N and 2 hitches and at least 75 mm for category 3N, 3, 4N and 4 hitches; transport pitches in the range −3° to +3° and +10° to +15° at the standard mast height; the distance from the end of the power take-off to the centre of the lower hitch point, with the lower link horizontal is selected from: for a 35 mm PTO shaft, for a category 1N hitch in the range 300 to 375 mm, for a category 1 hitch in the range 500 to 575 mm, for categories 2N and 2 hitches, in the range 510 to 675 mm, for category 3N or 3 hitches, preferably in the range 560 to 725 mm; for a 45 mm PTO shaft, for category 2N or 2 hitches, in the range 590 to 725 mm, for category 3N or 3 hitches, in the range 640 to 775 mm, for category 4N or 4 hitches in the range 650 to 875 mm; the lateral movement of the lower hitch point selected from: for category 1N hitch in the range 50 to 55 mm, for category 1 or 2N hitches in the range 100 to 110 mm, for category 2, 3N, 3, 4N and 4 hitches in the range 125 to 138 mm; wherein the horizontal convergence distance is selected from 1700 mm to 2400 mm for category 1 and 1N hitches, 1800 mm to 2400 mm for category 2, 2N and 3N hitches, 1900 to 2700 mm for category 3 hitches, 1900 to 2700 mm for category 4N hitches and 1900 to 2800 mm for category 4 hitches; and wherein the vertical convergence is at least 0.9 times the tractor wheelbase.
In another aspect, the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement comprising a platform for carrying agricultural tools or equipment, the platform comprising a toolbox welded or mechanically fixed thereto; the apparatus comprising at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement; wherein, in relation to the three point linkage at the second end of the apparatus: the lower hitch point height is selected from: a maximum of 200 mm for category 1N and 1 hitches, and a maximum of 203 mm for category 2N, 2, 3N, 3, 4N and 4 hitches; the torsional free float is selected from: at least 60 mm for category 1N, 1, 2N and 2 hitches and at least 75 mm for category 3N, 3, 4N and 4 hitches; transport pitches in the range −3° to +3° and +10° to +15° at the standard mast height; the distance from the end of the power take-off to the centre of the lower hitch point, with the lower link horizontal is selected from: for a 35 mm PTO shaft, for a category 1N hitch in the range 300 to 375 mm, for a category 1 hitch in the range 500 to 575 mm, for categories 2N and 2 hitches, in the range 510 to 675 mm, for category 3N or 3 hitches, preferably in the range 560 to 725 mm; for a 45 mm PTO shaft, for category 2N or 2 hitches, in the range 590 to 725 mm, for category 3N or 3 hitches, in the range 640 to 775 mm, for category 4N or 4 hitches in the range 650 to 875 mm; the lateral movement of the lower hitch point selected from: for category 1N hitch in the range 50 to 55 mm, for category 1 or 2N hitches in the range 100 to 110 mm, for category 2, 3N, 3, 4N and 4 hitches in the range 125 to 138 mm; wherein the horizontal convergence distance is selected from 1700 mm to 2400 mm for category 1 and 1N hitches, 1800 mm to 2400 mm for category 2, 2N and 3N hitches, 1900 to 2700 mm for category 3 hitches, 1900 to 2700 mm for category 4N hitches and 1900 to 2800 mm for category 4 hitches; and wherein the vertical convergence is at least 0.9 times the tractor wheelbase.
In a further aspect of the invention, there is provided an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement comprising a platform for carrying agricultural tools or equipment, the platform comprising a toolbox welded or mechanically fixed thereto; the apparatus comprising at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use and each lower link connected to a lift rod; at the second end, a hydraulic mechanism to raise or lower the lift rods connected to the lower links and thereby raise or lower the primary implement three point linkage; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement; wherein, in relation to the three point linkage at the second end of the apparatus: the lower hitch point height is selected from: a maximum of 200 mm for category 1N and 1 hitches, and a maximum of 203 mm for category 2N, 2, 3N, 3, 4N and 4 hitches; the levelling adjustment is selected from: at least 75 mm for a category 1N hitch, at least 100 mm for category 1, 2N and 2 hitches, at least 125 mm for category 3N and 3 hitches and at least 150 mm for category 4N and 4 hitches; the movement range is selected from: at least 610 mm for category 1N and 1 hitches, at least 650 mm for category 2N and 2 hitches, at least 735 mm for category 3N and 3 hitches, and at least 760 mm for category 4N and 4 hitches; the transport height is selected from: at least 600 mm for a category 1N hitch, at least 820 mm for a category 1 hitch, at least 950 mm for category 2N and 2 hitches, at least 1065 mm for category 3N and 3 hitches and at least 1200 mm for category 4N and 4 hitches; the lower hitch point clearance is selected from at least 90 mm for a category 1 hitch, and 100 mm for category 1, 2N, 2, 3N, 3, 4N, and 4 hitches; the mast adjustment height is selected from: for a category 1N hitch a lowest position of no more than 200 mm and a highest position of at least 420 mm, for a category 1 hitch, a lowest position of no more than 200 mm and a highest position of at least 508 mm, for category 2N and 2 hitches, a lowest position of no more than 200 mm and a highest position of at least 610 mm, for category 3N and 3 hitches, a lowest position of no more than 230 mm and a highest position of at least 660 mm, for category 4N and 4 hitches, a lowest position of no more than 255 mm and a highest position of at least 710 mm; the torsional free float is selected from: at least 60 mm for category 1N, 1, 2N and 2 hitches and at least 75 mm for category 3N, 3, 4N and 4 hitches; transport pitches in the range −3° to +3° and +10° to +15° at the standard mast height; the distance from the end of the power take-off to the centre of the lower hitch point, with the lower link horizontal is selected from: for a 35 mm PTO shaft, for a category 1N hitch in the range 300 to 375 mm, for a category 1 hitch in the range 500 to 575 mm, for categories 2N and 2 hitches, in the range 510 to 675 mm, for category 3N or 3 hitches, preferably in the range 560 to 725 mm; for a 45 mm PTO shaft, for category 2N or 2 hitches, in the range 590 to 725 mm, for category 3N or 3 hitches, in the range 640 to 775 mm, for category 4N or 4 hitches in the range 650 to 875 mm; the lateral movement of the lower hitch point selected from: for category 1N hitch in the range 50 to 55 mm, for category 1 or 2N hitches in the range 100 to 110 mm, for category 2, 3N, 3, 4N and 4 hitches in the range 125 to 138 mm wherein the horizontal convergence distance is selected from 1700 mm to 2400 mm for category 1 and 1N hitches, 1800 mm to 2400 mm for category 2, 2N and 3N hitches, 1900 to 2700 mm for category 3 hitches, 1900 to 2700 mm for category 4N hitches and 1900 to 2800 mm for category 4 hitches; and wherein the vertical convergence is at least 0.9 times the tractor wheelbase.
In another aspect, the invention provides an apparatus for attachment to a utility tractor, the apparatus having a first end and a second end and comprising: a frame; a primary implement selected from a grader blade, a bed former, a box blade scraper, a dirt scoop, harrows, a ripper, a rotary hoe, a plough, landscape rakes, an s-tine cultivator, and a tillage implement; the apparatus comprising at the first end, an upper hitch point and two lower hitch points for connecting to the three point linkage of a tractor; at the second end, a three point linkage for attachment to three point hitch points of a secondary implement, the three point linkage welded or mechanically fastened to the frame so as to support the weight of and use of a secondary implement, and the three point linkage comprising a length-adjustable upper link and two length-adjustable lower links, each lower link connected to a stabilising bar to restrict lateral movement in use and each lower link connected to a lift rod; at the second end, a hydraulic mechanism to raise or lower the lift rods connected to the lower links and thereby raise or lower the primary implement three point linkage; a power take-off extension extending from the first end to the second end to enable transfer of rotational force from the power take off of the tractor through to the secondary implement, the power take off extension comprising a housing, and a male attachment at each end for connection to power take off shafts at each end for connection to at the first end, the tractor power take-off via a first PTO drive shaft attachment and at the second end the secondary implement power take off receiver via a second PTO drive shaft attachment; at least one hydraulic hose to transfer hydraulic power from the first end to the second end of the primary implement and a hydraulic plug for attachment of hydraulic hoses thereto at the first end and the second end; three point hitch point adjustment means to raise or lower the point of attachment of the three point hitch at the first end relative to the primary implement; three point linkage adjustment means to raise or lower the point of attachment of the three point linkage at the second end of the apparatus relative to the primary implement; wherein, in relation to the three point linkage at the second end of the apparatus: the lower hitch point height is selected from: a maximum of 200 mm for category 1N and 1 hitches, and a maximum of 203 mm for category 2N, 2, 3N, 3, 4N and 4 hitches; the levelling adjustment is selected from: at least 75 mm for a category 1N hitch, at least 100 mm for category 1, 2N and 2 hitches, at least 125 mm for category 3N and 3 hitches and at least 150 mm for category 4N and 4 hitches; the movement range is selected from: at least 610 mm for category 1N and 1 hitches, at least 650 mm for category 2N and 2 hitches, at least 735 mm for category 3N and 3 hitches, and at least 760 mm for category 4N and 4 hitches; the transport height is selected from: at least 600 mm for a category 1N hitch, at least 820 mm for a category 1 hitch, at least 950 mm for category 2N and 2 hitches, at least 1065 mm for category 3N and 3 hitches and at least 1200 mm for category 4N and 4 hitches; the lower hitch point clearance is selected from at least 90 mm for a category 1 hitch, and 100 mm for category 1, 2N, 2, 3N, 3, 4N, and 4 hitches; the mast adjustment height is selected from: for a category 1N hitch a lowest position of no more than 200 mm and a highest position of at least 420 mm, for a category 1 hitch, a lowest position of no more than 200 mm and a highest position of at least 508 mm, for category 2N and 2 hitches, a lowest position of no more than 200 mm and a highest position of at least 610 mm, for category 3N and 3 hitches, a lowest position of no more than 230 mm and a highest position of at least 660 mm, for category 4N and 4 hitches, a lowest position of no more than 255 mm and a highest position of at least 710 mm; the torsional free float is selected from: at least 60 mm for category 1N, 1, 2N and 2 hitches and at least 75 mm for category 3N, 3, 4N and 4 hitches; transport pitches in the range −3° to +3° and +10° to +15° at the standard mast height; the distance from the end of the power take-off to the centre of the lower hitch point, with the lower link horizontal is selected from: for a 35 mm PTO shaft, for a category 1N hitch in the range 300 to 375 mm, for a category 1 hitch in the range 500 to 575 mm, for categories 2N and 2 hitches, in the range 510 to 675 mm, for category 3N or 3 hitches, preferably in the range 560 to 725 mm; for a 45 mm PTO shaft, for category 2N or 2 hitches, in the range 590 to 725 mm, for category 3N or 3 hitches, in the range 640 to 775 mm, for category 4N or 4 hitches in the range 650 to 875 mm; the lateral movement of the lower hitch point selected from: for category 1N hitch in the range 50 to 55 mm, for category 1 or 2N hitches in the range 100 to 110 mm, for category 2, 3N, 3, 4N and 4 hitches in the range 125 to 138 mm; wherein the horizontal convergence distance is selected from 1700 mm to 2400 mm for category 1 and 1N hitches, 1800 mm to 2400 mm for category 2, 2N and 3N hitches, 1900 to 2700 mm for category 3 hitches, 1900 to 2700 mm for category 4N hitches and 1900 to 2800 mm for category 4 hitches; and wherein the vertical convergence is at least 0.9 times the tractor wheelbase.
In some embodiments, the vertical convergence is at least the same length as the tractor wheelbase.
| Number | Date | Country | Kind |
|---|---|---|---|
| AU2020903008 | Aug 2020 | AU | national |
| AU2020904205 | Nov 2020 | AU | national |
