AU2003204443B1 - Steering mechanisms for ride-on mowers - Google Patents

Steering mechanisms for ride-on mowers Download PDF

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Publication number
AU2003204443B1
AU2003204443B1 AU2003204443A AU2003204443A AU2003204443B1 AU 2003204443 B1 AU2003204443 B1 AU 2003204443B1 AU 2003204443 A AU2003204443 A AU 2003204443A AU 2003204443 A AU2003204443 A AU 2003204443A AU 2003204443 B1 AU2003204443 B1 AU 2003204443B1
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AU
Australia
Prior art keywords
steering shaft
steering
chassis
mower
crank arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU2003204443A
Inventor
Theo Reinhold
Norman Bryan Surman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bartlem Pty Ltd
Original Assignee
Bartlem Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bartlem Pty Ltd filed Critical Bartlem Pty Ltd
Priority to AU2003204443A priority Critical patent/AU2003204443B1/en
Publication of AU2003204443B1 publication Critical patent/AU2003204443B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/64—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/82—Other details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical

Description

P/00/011 Regulation 3.2 COMMONWEALTH OF AUSTRALIA Patents Act 1990 COMPLETE SPEC/F/CA TON FORA STANDARD PA TENT Name ofApplicant: Actual/Inventors): Address for Service: Invend/on Tile.
BARTLEM PTY LTD Theo Reinhold Norman Bryan Surman AHEARN FOX Patent Trade Mark Attorneys GPO Box 1149 Brisbane Queensland 4001 *STEERING MECHANISMS FOR RIDE-ON MOWERSw The following statement is a full description of this invention, including the best method of performing it known to us: STEERING MECHANISMS FOR RIDE-ON MOWERS This invention relates to ride-on mowers and steering mechanisms for ride-on mowers. The invention has particular application to ride-on mowers of the type which have a vertical crankshaft engine mounted on the mower chassis in front of the drivers seat and are commonly referred to as "tractor" type rideon mowers.
Typically, a cutter drive pulley and a ground drive pulley are mounted on the crankshaft below the chassis and the associated belts extend to the cutter shaft and the rear drive shaft respectively. Additionally, linkage mechanisms for raising and lowering the cutter deck and for engaging and disengaging the cutter drive are generally located between the chassis and the cutter deck.
Large ride-on mowers, for example, 20 horsepower models with 36 inch cutters, generally have sufficient room for elaborate steering mechanisms to be located between the chassis and the mower deck while avoiding contact with the pulleys, belts, the cutter drive linkages and various other linkage mechanisms that are mounted under the chassis. However, smaller models have much less room and consequently the same elaborate mechanisms cannot satisfactorily fit in the available room and moreover would add too much to the manufacturing costs of small mowers to be price competitive. Consequently, small tractor type ride-on mowers typically have a centrally mounted steering column which extends downwardly from the steering wheel through the chassis and rotates with the steering wheel with a radial arm connected to the_.lower end-of the column also rotating with the steering wheel. A drag link extends from the radial arm to a crank arm secured to one king pin so that when the steering wheel is rotated the drag link causes the crank arm to partially rotate the king pin which causes the king pin and the attached wheel to -2turn to the left or right as the case may be. The two front wheels are connected by a tie rod so that they turn together.
While such known steering mechanisms work satisfactorily, they are not as responsive nor as smooth as desired. Additionally, the drag link is located between the chassis and the mower deck and undesirably close to the pulleys, belts and linkages.
One object of the present invention is to provide a tractor type ride-on mower, which has a more responsive steering mechanism than the presently available small tractor type ride-on mowers. Another object is to provide a tractor type ride-on mower which does not have a drag link close to the cutter drive pulley. Another object is to provide a steering mechanism for ride-on mowers, particularly small tractor type ride-on mowers, which is more responsive than the mechanisms presently used on such mowers. Still another object is to provide a steering mechanism which does not require a drag link to move forward and back generally in the direction of travel in close proximity to the cutter drive pulley.
With the foregoing in view, the invention in one aspect resides broadly in a ride-on mower having a steering mechanism in which the steering wheel is secured to a first steering shaft and rotational movement of the steering wheel and the first steering shaft is converted to linear movement of a first link member connected to the first steering shaft which in turn is connected to a second steering shaft and linear movement of the first link member is converted to rotational movement of the second steering shaft which in turn is connected to a second link member and rotational movement of the second steering shaft is converted to linear movement of the second link member which in turn is connected to the front wheels of the mower and linear movement of the second link member is converted to movement of the front wheels from left to right or vice versa.
In another aspect the invention resides broadly in a steering mechanism for a ride-on mower, including a steering wheel secured to a first steering shaft and a first link member connected to said first steering shaft such that rotational movement of said steering wheel and said first steering shaft is converted to linear movement of a first link member which in turn is connected to a second steering shaft such that linear movement of said first link member is converted to rotational movement of said second steering shaft which in turn is connected to a second link member such that rotational movement of said second steering shaft is converted to linear movement of said second link member which in turn is connected to the front wheels of the mower such that linear movement of said second link member is converted to movement of the front wheels from left to right or vice versa.
In another aspect the invention resides broadly in a ride-on mower having a chassis, a set of front wheels and a set of rear wheels operatively connected to said chassis, a mower deck depending from said chassis, an engine mounted on said chassis and drivingly connected to said mower deck and said rear wheels, and a steering mechanism for turning the mower in one direction or the other; characterised in that said steering mechanism includes: a first steering shaft having a first crank arm and a steering wheel secured thereto for rotating said first steering shaft about a first axis; a second steering shaft spaced from said first steering shaft having a second crank arm secured thereto for rotation therewith about a second axis; a drag link operatively connected at one end to said first crank arm and at its other end to said second crank arm whereby rotation of said first steering shaft about said first axis causes said second steering shaft to rotate about said second shaft axis; and connecting means connecting said second steering shaft to -4said front wheels and adapted to cause said front wheels to turn in unison towards the right or left in response to rotational movement of said second steering shaft in one direction or the other.
In another aspect the invention resides broadly in a steering mechanism for a ride-on mower having a chassis, a set of front wheels and a set of rear wheels operatively connected to the chassis, a mower deck depending from the chassis, an engine mounted on the chassis and drivingly connected to the mower deck and the rear wheels; the steering mechanism including: a first steering shaft having a first crank arm and a steering wheel secured thereto for rotating said first steering shaft about a first axis, said first steering shaft being adapted to be mounted to the chassis for rotational movement relative thereto about the shaft axis; a second steering shaft having a second crank arm secured thereto for rotation therewith, said second steering shaft being adapted to be mounted to the chassis for rotation about a second shaft axis spaced from said first shaft axis; a drag link adapted to connect said first crank arm to said second crank arm whereby rotation of said first steering shaft about said first axis may cause said second steering shaft to rotate about said second shaft axis in response to rotational movement of said steering wheel; and connecting means adapted to connect said second steering shaft to the front wheels whereby rotation of said steering wheel may cause the front wheels to turn in unison towards the right or left in response to rotational movement of said second steering shaft in one direction or the other.
In another aspect the invention resides broadly in a ride-on mower including: a chassis; a set of front wheels and a set of rear wheels operatively connected to said chassis; a mower deck depending from said chassis; an engine mounted on said chassis and drivingly connected to said mower deck and said rear wheels; and s a drivers seat behind said engine; a steering mechanism for turning the mower to the left or right; characterised in that said steering mechanism includes: a first steering shaft adapted to rotate about a first axis in front of said drivers seat and a steering wheel secured to said first steering shaft for rotating said shaft about said axis and a first crank arm secured to said first steering shaft for rotation therewith; a second steering shaft spaced from said first steering shaft having a second crank arm secured thereto for rotation therewith about a second axis; a drag link operatively connected at one end to said first crank arm and at its other end to said second crank arm whereby rotation of said first steering shaft about said first axis causes said second steering shaft to rotate about said second shaft axis; and connecting means connecting said second steering shaft to said front wheels and adapted to cause said front wheels to turn in unison towards the right or left in response to rotational movement of said second steering shaft in one direction or the other.
Preferably, said front wheels are connected by a tie rod which is adapted to move from side to side across the forward direction of travel to turn the two wheels in unison to the right or left as required and the connecting means includes a third crank arm secured to said second steering shaft for rotation therewith about said second axis and a second drag link connected at one end to said third crank arm and at the other end to said tie rod whereby rotational movement of said third crank arm causes cBdROII21 /amedmen/as. /1AJly 2003 -6linear movement of said tie rod via said second drag link.
It will be appreciated that the front wheels are typically a significant distance forward of the steering wheel and the drivers seat and the force required to turn the wheels is transmitted over a large part of that distance by torsional forces via the second steering shaft thus avoiding the use of long drag links through the confined space between the chassis and the mower deck. Additionally, the first drag link advantageously allows the second steering shaft to be positioned offset from the centre of the chassis thus allowing it to be well clear of the cutter pulley, drive pulley and their associated belts.
Preferably, the drag links are connected to the respective crank arms by ball joints adapted to accommodate movement of the crank arms through arcs in different planes.
The term steering wheel as used herein is to be understood to include items that function as a steering wheel although they may not be a "wheel", for example, a steering bar.
In order that the invention may be more readily understood and put into practical effect, reference will now be made to the accompanying drawings which illustrate a preferred embodiment of the invention, wherein: FIG. 1 is a pictorial representation of a mower according to the invention; FIG. 2 is a pictorial representation of the steering mechanism of the mower of Fig. 1 with part of the mower; FIG. 3 is a pictorial representation of part of the mower of Fig. 1 showing aspects of the steering mechanism and the chassis; FIG. 4 is a pictorial representation of part of the mower of Fig. 1 showing other aspects of the steering mechanism and the chassis; FIG. 5 is a pictorial representation of part of the mower -7of Fig. 1 showing other aspects of the steering mechanism and the chassis.
FIG. 6 is a pictorial representation of part of the mower of Fig. 1 showing other aspects of the steering mechanism and the chassis.
The tractor type ride-on mower 10 illustrated in FIG. 1 has a folded sheet metal chassis 11 which is supported on a pair of spaced apart front wheels 12 and a pair of spaced apart rear wheels 13. A vertical crank shaft engine 14 is mounted on the chassis towards its front end and covered by a bonnet 16. The vertical crank shaft extends through the chassis where a ground drive pulley 17 and a cutter drive pulley 18 are mounted on the lower end of the shaft.
A cutter deck 19 hangs from the chassis on linkages and is height adjustable relative to the chassis and the cutter blades(not shown) are driven by cutter vee belt 20 from the pulley 18 in known manner.
A rear drive shaft housing 21 is mounted on the chassis behind the engine and is arranged to tilt backwards to gain access to the rear drive shaft and associated drive components and the drivers seat 22 is mounted on top of the housing a suitable distance behind the steering wheel 23 which is located immediately behind the engine with the centre of the steering wheel being midway across the width of the mower. A ground drive vee belt 24 driven by the ground drive pulley drives the rear drive shaft under the housing 21.
As can be seen more clearly in FIG. 2, the steering wheel is mounted to the upper end of a first steering shaft 26 which is supported for rotation in a bronze bearing 27 at its lower end which is mounted in a bearing plate 28 on the chassis, and at its other end in a bronze bearing 29 which is supported by a bracket which also is mounted to the chassis. A first crank arm 32 is welded to the first steering shaft near its lower end for rotation therewith about the shaft axis 26a.
A second steering shaft 33 extends from near the front axle beam 34 where it is supported in a nylon bearing 36 which is mounted in a housing 37 secured to the chassis at its front end to another nylon bearing 38 which is mounted in bearing housing 39 secured to the chassis in a position spaced sideways from the first steering shaft 26. It will be understood that the second steering shaft passes through the chassis to the right hand side of the engine so as not to interfere with the pulleys and belts beneath the chassis. However, in other embodiments it could pass to the left hand side of the engine if desired. The second steering shaft also does not interfere with the linkage for raising and lower the mower deck or for engaging the cutter drive. A second crank arm 41 is welded to the second steering shaft near its rear end and that crank arm is connected to the first crank arm 32 on the first steering shaft by a drag link 42 which has ball joints 43 at each end for that purpose. It will be appreciated that rotation of the steering wheel 23 causes rotation of the first steering shaft 26 and the first crank arm 32 therewith which in turn causes linear movement of the drag link 42 which in turn causes rotational movement of the second steering shaft 33. For the sake of clarification, the term "rotation" and its derivatives in relation to the steering mechanism is to be understood as including rotation through only part of a full turn, for example an arc of only a few degrees.
A third crank arm 45 is welded to the second steering shaft near its forward end for rotation with the second steering shaft and that crank arm in turn is connected to the tie rod 46 by a second drag link 47 which has ball joints 48 at both ends for that purpose. The tie rod is pivotally connected at its opposite ends to crank arms 51 and 52 which are arranged to turn the left and right king pins 53 and 54 and their attached wheels 55 and 56 upon sideways movement of the tie rod in response to rotational movement of the second steering shaft. In order to limit the extent of the arc through which the wheels may be turned, stop lugs 57 and 58 are provided on the front axle beam which are engaged by either crank arm 51 or 52 when they reach the maximum desired turn to the right or left. Suitably, the third drag link lies generally in a plane parallel to and behind the plane containing the front axle beam although it will be appreciated that as the wheels are turned from right to left the tie rod moves in and out of that plane taking the lower ball joint with it.
Advantageously, the present invention allows the steering wheel and the first steering shaft to be mounted in any desired position across the width of the mower but without using undesirably long drag links.
While the foregoing description has been given by way of illustrative example of the invention, it will be understood that the invention may be embodied in many other forms and all such forms are deemed to fall within the broad scope and ambit of the invention as defined in the appended claims.

Claims (16)

1. A ride-on mower having a pair of spaced apart steerable front wheels and a steering mechanism for steering the front wheels in which a steering wheel is secured to a first steering shaft and rotational movement of the steering wheel and the first steering shaft is converted to linear movement of a first link member connected to the first steering shaft which in turn is connected to a second steering shaft and linear movement of the first link member is converted to rotational movement of the second steering shaft which in turn is connected to a second link member and rotational movement of the second steering shaft is converted to linear movement of the second link member which in turn is connected to the front wheels of the mower and linear movement of the second link member is converted to movement of the front wheels from left to right or vice versa.
2. A ride-on mower having a chassis, a set of front wheels and a set of rear wheels operatively connected to said chassis, a mower deck depending from said chassis, an engine mounted on said chassis and drivingly connected to said mower deck and said rear wheels, and a steering mechanism for turning the mower in one direction or the other; characterised in that said steering mechanism includes: a first steering shaft having a first crank arm and a steering wheel secured thereto for rotating said first steering shaft about a first axis; a second steering shaft spaced from said first steering shaft having a second crank arm secured thereto for rotation therewith about a second axis; a drag link operatively connected at one end to said first crank arm and at its other end to said second crank arm whereby rotation of said first steering shaft about said first axis causes said second steering shaft to rotate about said second shaft axis; and connecting means connecting said second steering shaft to cBAdRlO2i, amend'men 10 Jur 12013 -11- said front wheels and adapted to cause said front wheels to turn in unison towards the right or left in response to rotational movement of said second steering shaft in one direction or the other.
3. A ride-on mower including: a chassis; a set of front wheels and a set of rear wheels operatively connected to said chassis; a mower deck depending from said chassis; an engine mounted on said chassis and drivingly connected to said mower deck and said rear wheels; and a drivers seat behind said engine; a steering mechanism for turning the mower to the left or right; characterised in that said steering mechanism includes: a first steering shaft adapted to rotate about a first axis in front of said drivers seat and a steering wheel secured to said first steering shaft for rotating said shaft about said axis and a first crank arm secured to said first steering shaft for rotation therewith; a second steering shaft spaced from said first steering shaft having a second crank arm secured thereto for rotation therewith about a second axis; a drag link operatively connected at one end to said first crank arm and at its other end to said second crank arm whereby rotation of said first steering shaft about said first axis causes said second steering shaft to rotate about said second shaft axis; and connecting means connecting said second steering shaft to said front wheels and adapted to cause said wheels to turn in unison towards the right or left in response to rotational movement of said second steering shaft in one direction or the other.
4. A ride-on mower according to any one of the preceding -12- claims, wherein said front wheels are connected by a tie rod which is adapted to move from side to side across the forward direction of travel to turn the two wheels in unison to the right or left as required and the connecting means includes a third crank arm secured to said second steering shaft for rotation therewith about said second axis and a second drag link connected at one end to said third crank arm and at the other end to said tie rod whereby rotational movement of said third crank arm causes linear movement of said tie rod via said second drag link.
5. A ride-on mower according to Claim 4, wherein said drag links are connected to said respective crank arms by ball joints adapted to accommodate movement of said crank arms through arcs in different planes.
6. A ride-on mower according to any one of Claims 2 to wherein said engine has a crank case and said second steering shaft passes through said chassis to one side of said crankcase.
7. A ride-on mower according to Claim 6, wherein said chassis is a folded sheet metal chassis which is supported on a pair of spaced apart front wheels and a pair of spaced apart rear wheels and said engine is a vertical crank shaft engine which is mounted on said chassis towards its front end.
8. A ride-on mower according to any one of Claims 2 to 7, wherein said second steering shaft is rotatably mounted at its front end in a bearing supported by said chassis offset towards one front wheel and at its rear end by a bearing offset to the same side from said first steering shaft.
9. A ride-on mower according to any one of Claims 2 to 8, wherein said second crank arm is welded to said second steering shaft near its rear end.
10. A ride-on mower according to any one of Claims 2 to 9, wherein a third crank arm is welded to said second steering shaft near its forward end for rotation with said second steering shaft and said third crank arm in turn is connected to the tie rod by cARI1lffmeadmfen/1SJO July 20903 -13- a second drag link.
11. A steering mechanism for a ride-on mower having a pair of front wheels, including a steering wheel secured to a first steering shaft and a first link member connected to said first steering shaft such that rotational movement of said steering wheel and said first steering shaft is converted to linear movement of a first link member which in turn is connected to a second steering shaft such that linear movement of said first link member is converted to rotational movement of said second steering shaft which in turn is connected to a second link member such that rotational movement of said second steering shaft is converted to linear movement of said second link member which in turn is connected to the front wheels of the mower such that linear movement of said second link member is converted to movement of the front wheels from left to right or vice versa.
12. A steering mechanism for a ride-on mower having a chassis, a set of front wheels and a set of rear wheels operatively connected to the chassis, a mower deck depending from the chassis, an engine mounted on the chassis and drivingly connected to the mower deck and the rear wheels; the steering mechanism including: a first steering shaft having a first crank arm and a steering wheel secured thereto for rotating said first steering shaft about a first axis, said first steering shaft being adapted to be mounted to the chassis for rotational movement relative thereto about the shaft axis; a second steering shaft having a second crank arm secured thereto for rotation therewith, said second steering shaft being adapted to be mounted to the chassis for rotation about a second shaft axis spaced from said first shaft axis; a drag link adapted to connect said first crank arm to said second crank arm whereby rotation of said first steering shaft about said first axis may cause said second steering shaft to c9RIOI/Z1 amendments. 10 200 -14- rotate about said second shaft axis in response to rotational movement of said steering wheel; and connecting means adapted to connect said second steering shaft to the front wheels whereby rotation of said steering wheel may cause the front wheels to turn in unison towards the right or left in response to rotational movement of said second steering shaft in one direction or the other.
13. A steering mechanism for a ride-on mower according to Claim 11 or Claim 12, wherein the front wheels are connected by a tie rod which is adapted to move from side to side across the forward direction of travel to turn the front wheels in unison to the right or left as required and said connecting means includes a third crank arm secured to said second steering shaft for rotation therewith about said second axis and a second drag link connected at one end to said third crank arm and at the other end to said tie rod whereby rotational movement of said third crank arm causes linear movement of said tie rod via said second drag link.
14. A steering mechanism for a ride-on mower according to Claim 13, wherein said drag links are connected to said respective crank arms by ball joints adapted to accommodate movement of said crank arms through arcs in different planes.
A ride-on mower as hereinbefore described with reference to the accompanying drawings.
16. A steering mechanism for a ride-on mower as hereinbefore described with reference to the accompanying drawings. Dated this 10th day of July, 2003 BARTLEM PTY LTD By their Patent Attorneys AHEARN FOX cRARI,/121 amendmen s IO1Ju4292003
AU2003204443A 2003-02-26 2003-05-30 Steering mechanisms for ride-on mowers Ceased AU2003204443B1 (en)

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Application Number Priority Date Filing Date Title
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AU2003900855A AU2003900855A0 (en) 2003-02-26 2003-02-26 Steering mechanisms for ride-on mowers
AU2003900855 2003-02-26
AU2003204443A AU2003204443B1 (en) 2003-02-26 2003-05-30 Steering mechanisms for ride-on mowers

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AU2003900855A Abandoned AU2003900855A0 (en) 2003-02-26 2003-02-26 Steering mechanisms for ride-on mowers
AU2003204443A Ceased AU2003204443B1 (en) 2003-02-26 2003-05-30 Steering mechanisms for ride-on mowers
AU2004200658A Abandoned AU2004200658A1 (en) 2003-02-26 2004-02-20 Steering mechanisms for ride-on mowers
AU2011201082A Abandoned AU2011201082A1 (en) 2003-02-26 2011-03-10 Steering mechanisms for ride-on mowers

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AU2011201082A Abandoned AU2011201082A1 (en) 2003-02-26 2011-03-10 Steering mechanisms for ride-on mowers

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11661117B2 (en) * 2021-07-08 2023-05-30 City Transformer Ltd. Foldable vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11661117B2 (en) * 2021-07-08 2023-05-30 City Transformer Ltd. Foldable vehicle

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AU2011201082A1 (en) 2011-04-07
AU2003900855A0 (en) 2003-03-13
AU2004200658A1 (en) 2004-09-16

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