WO2002094000A1 - Mechanisme d'aerateur ameliore - Google Patents

Mechanisme d'aerateur ameliore Download PDF

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Publication number
WO2002094000A1
WO2002094000A1 PCT/AU2002/000620 AU0200620W WO02094000A1 WO 2002094000 A1 WO2002094000 A1 WO 2002094000A1 AU 0200620 W AU0200620 W AU 0200620W WO 02094000 A1 WO02094000 A1 WO 02094000A1
Authority
WO
WIPO (PCT)
Prior art keywords
tine
tine leg
leg
roller
aerator
Prior art date
Application number
PCT/AU2002/000620
Other languages
English (en)
Inventor
David John Livingstone
Original Assignee
Greencare 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 Greencare Pty Ltd filed Critical Greencare Pty Ltd
Publication of WO2002094000A1 publication Critical patent/WO2002094000A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B45/00—Machines for treating meadows or lawns, e.g. for sports grounds
    • A01B45/02—Machines for treating meadows or lawns, e.g. for sports grounds for aerating
    • A01B45/023—Perforators comprising spiking tools actively driven in a reciprocating movement through a crankshaft or eccentric mechanism

Definitions

  • the present invention relates generally to greenkeeping equipment and in particular the invention provides an improved reciprocating drive for a turf aeration device.
  • a basic problem with tine rollers and, which has been overcome to a certain degree by some more advanced systems is that of tearing which occurs when the tine does not enter and exit the turf vertically but instead passes through an arc while it is in the ground. This action damages the turf surface and makes it less useful for its intended purpose during the period immediately following aeration. It is also highly desirable that turf aerators be able to operate quickly in order to minimise the cost of this operation and enable the operation to be performed more regularly. Another cost related factor is the reliability of the equipment which typically decreases with increased speed and is adversely affected by the typically dirty environment in which the equipment must operate, making lubricants applied to bearing surfaces become like grinding pastes which rather than increasing the life of the bearing surface tend to decrease that life rapidly.
  • an aerator has a plurality of tines located at the ends of tine legs which are reciprocated by a crankshaft and arranged transversely of the aerator.
  • the tine legs are each slidably mounted towards their lower end in a guide which is in turn reciprocated fore and aft to keep the tine leg vertical while it is in engagement with the ground.
  • the prior art tine legs are articulated to accommodate the differing relative horizontal speeds of the crankshaft and the leg guides, which maintain the lower portion of the legs in vertical orientation.
  • the machine can only move forward 50mm for every revolution of the crank shaft and therefore a relatively high tine speed is required for reasonable rate of coverage. Due to their mechanical arrangement, prior art machines were subject to higher rates of wear and fixed hole arrangements limited by a single cam.
  • the present invention consists in a turf aerator with a reciprocating drive mechanism comprising: a substantially rigid tine leg pivotally mounted at an upper end to a drive assembly arranged to reciprocate the tine leg along its longitudinal axis, the drive assembly comprising: a reciprocating drive member to which the tine leg is pivotally attached at a first point along the drive member, the drive member being pivotally connected at a second point to a frame and at a third point to a first eccentric, the first eccentric being rotated to reciprocate the first point on the drive member substantially vertically; and a guide arrangement comprising: a first roller mounted on a first pivotable arm, located rearward of the tine leg relative to the normal direction of travel of the aerator and biased to a forward position; and a first stop means mounted to the frame, the first stop means acting to limit travel of the first roller in a forward direction.
  • the third point is preferably located intermediate the first and second points. However, it will be appreciated that the third point need not be located intermediate the first and second points.
  • the lower end of the tine leg is able to move in a rearward direction to allow the tine to move relative to the machine while the tine is in the ground.
  • the tine leg is biased to a forward position such that when the tine leaves the ground, the tine leg returns toward the forward end of its travel ready for re-engagement with the ground. Biasing may be by a variety of spring arrangements. By acting on a variable point on the tine leg the roller exerts a variable return torque in the forward direction, the torque increasing to a maximum as the tine leg reaches the top of its stroke.
  • the first stop means may be mounted on the rearward side of the tine leg, the first stop means acting to abut the first pivotable arm to limit movement of the first roller in the forward direction.
  • a second roller may be mounted on a second pivotable arm located forward of the tine leg relative to the normal direction of travel of the aerator and biased to a rearward position.
  • a second stop means may be mounted to the frame. The second stop means may act to limit travel of the second roller in the rearward direction.
  • the first and second rollers may engage a lower portion of the tine leg whereby the first roller biases the tine leg towards a position ready for insertion of the tine into the ground and the second roller dampens overtravel of the tine leg in the forward direction.
  • the drive member may be pivotally connected at a second point to a second eccentric.
  • the first and second eccentrics may be rotated in synchronism to reciprocate the first point on the drive member both vertically and horizontally.
  • the diameter of the path of rotation of the second eccentric is less than the path of rotation of the first eccentric, and the two eccentrics preferably rotate in the same direction, more preferably in a counter-clockwise rotation.
  • the timing of the eccentrics relative to one another may be varied in order to adjust the operation of the tine leg and in particular, the timing may be adjusted in a given embodiment depending upon the conditions in which the aerator is operating.
  • the biasing may be effected by way of a resiliently flexibly mounted guide arrangement.
  • the guide arrangement may comprise a pair of rollers. One roller may be mounted on each side of the tine leg. Each roller may be rotatably mounted at the end of a roller arm. A plurality of coil springs may be connected to the roller and/or its arm for drawing the roller into abutment with the tine leg and for exerting a restoring force on the tine leg.
  • This guide arrangement may also serve to damp rapid horizontal reciprocatory motion of the tine leg when the aerator is rapidly traversing a surface, in use.
  • the present invention consists of a tine leg and pivotable foot assembly for carrying a tine, wherein the assembly comprises: a base plate; a pair of upwardly directed mounting brackets extending either side of the tine leg and pivotably attached thereto about a transverse horizontal axis and at least one of the mounting brackets including an extension projecting beyond the horizontal axis; an arm extending from the tine leg substantially perpendicular to the leg to limit pivotal travel of the base plate at an extremity of travel in a first direction; spring means between the arm and the base plate or an extension of the base plate to bias the base plate towards the extremity of travel in the first direction; and a limiting member extending from the tine leg in a path of the extension projecting from the at least one of the mounting brackets to limit pivotal travel of the base plate at an extremity of travel in a second direction.
  • a first stop means such as a resilient rubber pad is located between the extension of the at least one mounting bracket and the second travel limiting bracket.
  • a second stop means which may also be a resilient rubber pad, is located between the limiting member and the base plate.
  • a locking member may be included to lock the base plate against movement relative to the tine leg in certain applications.
  • the locking member may be a wedge inserted between the extension of the at least one mounting bracket and the limiting member.
  • Figure 1 illustrates a perspective view of a first embodiment of the invention comprising an aerator arranged to be carried by, or towed behind a vehicle provided with a three point hitch;
  • Figure 2 is a side elevation of the aerator mechanism at its lowest point in a cycle of operation;
  • Figure 3 illustrates a perspective view of a second embodiment of the invention comprising a self-propelled turf aerator;
  • Figure 4 illustrates a perspective view of a "ride on" embodiment of the invention;
  • Figure 5 illustrates a side elevation of a second embodiment of the aerator mechanism at its highest point in its cycle of operation
  • Figure 6 is a side elevation of the aerator mechanism of Figure 5 showing paths of various components during a cycle of operations;
  • Figure 7 illustrates a side view of the guide mechanism as shown in Figures 2, 5 and 6;
  • Figure 8 illustrates a side elevation of the foot mechanism as shown in Figures 2 and 5.
  • FIG. 1 a first implementation of the invention is illustrated in which an aerator 11 of the type towed behind a tractor or similar vehicle is shown.
  • mounting points 12, 13, 14 are provided for attachment to the three-point hitch of the towing vehicle and an input shaft 15 is arranged to connect to a power take-off of the towing vehicle.
  • the aerator mechanism 16 is mounted on a chassis 17 and the rear wheels 21 (see Figure 2) are mounted on a ram 18, extending below a bracket 57 on the chassis 17 and connected by resilient connection 19, such that when the towing vehicle raises the three point hitch, the chassis 17 raises but the wheels or a roller 21 connected to the ram 18 may be lowered to remain in contact with the ground to help support the aerator.
  • FIG. 2 an embodiment of the invention is illustrated wherein the aerator mechanism is shown in detail at a point of its cycle where the aerator tines 31 are fully lowered into the turf surface 52.
  • the mechanism is mounted on a frame 32 extending above the chassis 17 and includes a substantially horizontally extending reciprocating drive member 33 mounted to the frame 32 by a pivotal connection 34, and a substantially vertical tine leg 35 connected at its upper end to the opposite end of the drive member 33 by a pivotal connection 36.
  • the tines 31 are mounted to a platform that forms part of the foot assembly 80 which is mounted to the lower end of the tine leg 35.
  • a push rod 37 extends between a pivotable connection 58 on the drive member 33 and the pivotable connection 59 on a crank 38 to drive the drive member 33 and thereby the tine leg 35 in reciprocating motion.
  • the crank 38 is connected to a coaxial chain wheel 39 which is driven via chains 48, chain wheel 51 and gearbox 41 and power take-off connection 15.
  • An adjustable tensioning means may be provided (not shown) to regulate the movement of the chains 48.
  • Rotation of the crank 38 causes reciprocation of the drive member 33 via the push rod 37 and subsequently this causes the tine leg 35 to reciprocate substantially vertically.
  • Reciprocation is controlled in synchronisation with forward motion of the aerator such that a uniform pattern of holes is punched in the turf surface 52 as the aerator advances.
  • the tines moves backward relative to the implement.
  • the tine leg 35 is moved forward by a first guide mechanism comprising a first roller 144 carried on a first arm 143 mounted to the frame at a first pivot point 140 and biased to a forward position by a first spring 152.
  • the first guide mechanism is located behind the tine leg 35, and acts to push the tine leg 35 forward when it leaves the ground 52 and to continuously and smoothly push it towards the forward extremity of its travel.
  • a first stop means mounted to the frame 32 acts to abut the first pivot arm 143 when the first roller 144 reaches a forward most position. The first roller 144 pushes the tine leg 35 forward until the tine leg 35 re-enters the ground, however if overtravel occurs the tine leg 35 will strike the second guide mechanism, which decelerates the lower end of the tine leg 35 prior to the tines 31 being reinserted into the turf surface 52.
  • the second guide mechanism includes a second arm 141 with a second pivot point 142 which is mounted to the frame 32. At a first end of the second arm 141 is attached a spring 154 mounted to the frame 32 (or a bracket or member extending from the frame). At a second end of the second arm 141 is attached a second roller 146 which abuts the tine leg 35 at least when it approaches its forwardmost position. A second stop means 150 mounted to the frame 32 abuts the second arm 141 when the second roller reaches a most rearward position. The second stop means includes a resilient buffer to cushion the impact of the second arm 141. In some embodiments, the second roller 146 may remain in contact with the tine leg 35 at substantially all times.
  • the guide mechanisms and in particular the first guide mechanism, operate at variable points on the tine leg, depending upon the point of the operating cycle, the torque applied to move the leg forward as it is removed from the ground increases towards maximum at the top of its stroke. This results in a smooth increase in acceleration as the tine is lifted. Any torque applied by the second guide mechanism is similarly reduced as the tine leg descends.
  • the wheels or roller 21 When the aerator 11 is set at its normal operating height, the wheels or roller 21 will be in contact with the ground 52 to help support the aerator (or in self-propelled models, to substantially fully support the aerator).
  • the jack 18 When aeration is not in progress, the jack 18 is extended to raise the chassis 17 sufficiently to lift all of the tines clear of the ground, regardless of their position in the aeration cycle. In the case of the tractor-mounted model of Figures 1 & 2, this would be carried out in conjunction with the raising of the 3-point hitch, connected to the mounting points 12, 13 14.
  • the jack 18, additionally serves as a tine depth adjustment mechanism.
  • tine leg 35 is illustrated for the sake of simplicity, typically 2, 4, or more tine legs and their associated drive mechanisms as described above, will be provided side by side in the chassis 17. These mechanisms are operated at the same speed (they are driven off one gearbox), but will typically have their operating cycles offset such that the load on the drive components is distributed over the cycle and not subjected to the shock of all tines hitting the ground and being driven in simultaneously. This also reduces the lifting force created as the tines are driven into hard earth.
  • first guide mechanism and second guide mechanism may be replaced with a first rosta tensioner arranged rearwardly of the tine leg 35, and a second rosta tensioner arranged ahead of the tine leg 35.
  • the first rosta tensioner includes a first torsion block, a first tensioner arm extending from the torsion block and a first roller which abuts the tine leg 35 substantially all of the time.
  • the second rosta tensioner includes a second torsion block, a second tensioner arm extending from the torsion block and a second roller which preferably abuts the tine leg 35 when it approaches the forwardmost position.
  • Each torsion block is preferably formed of a resilient material and is preferably mounted at one end to the frame 32.
  • FIG. 3 a self propelled, "walk-behind” version of the aerator is illustrated.
  • the aerator mechanism 16 is mounted on a chassis 17 and ram 18 resiliently connected to the chassis carries the wheels on a roller 21.
  • the front of the implement is supported on a single or double wheel 23 mounted at the lower end of a post 24 rotatably mounted through the forward end of the chassis 17.
  • a control arm 25 extends from and is pivotally connected to the upper end of the post 24 and includes a plurality of control levers 26 used to operate the implement.
  • a motor 27 is provided to drive the aerator mechanism and to propel the implement via the rear wheels 21.
  • the reciprocating drive member 33 is connected to a rotating eccentric 57 at one end by a pivotal connection 34, and a substantially vertical tine leg 35 connected at its upper end to the opposite end of the drive member 33 by a pivotal connection 36.
  • the eccentric 57 is connected to a belt wheel 44, chain 45, chain wheel 63 and gearbox 41.
  • the eccentric also includes a counter balance 47 to minimise vibration caused by the horizontal reciprocation of the drive member 33.
  • FIG. 4 a "ride on" version of the aerator is illustrated, in which the forward end of the chassis 17 is elongated and an operator's seat 71 is provided behind the operating arm 25.
  • all of the pivot points .and drive shaft bearings in the mechanisms are manufactured with self lubricating bushes formed of lubrication impregnated nylon and sealed bearings are used wherever required.
  • FIG. 5 a further embodiment of the invention is illustrated wherein the aerator mechanism is again shown in detail at a point of its cycle where the aerator tines 31 are raised above the turf surface 52.
  • the jack 18 is extended to raise the chassis 17 sufficiently to lift all of the tines clear of the ground.
  • the mechanism is mounted on a frame 32 extending above the chassis 17 and includes a substantially horizontally extending reciprocating drive member 33 connected to a rotating eccentric 57 at one end by a pivotal connection 34, and a substantially vertical tine leg 35 connected at its upper end to the opposite end of the drive member 33 by a pivotal connection 36.
  • a push rod 37 extends between a pivotable connection 58 on the drive member 33 and the pivotable connection 59 on a crank 38 to drive the drive member 33 and thereby the tine leg 35 in reciprocating motion.
  • the crank 38 is connected to a coaxial chain wheel 39 which is driven via chains 48, chain wheel 51 and gearbox 41 and power take-off connection 15 and the eccentric 57 is similarly connected to a coaxial chain wheel 44, chain 45, chain wheel 63 and the gearbox 41.
  • the eccentric 57 also includes a counter balance 47 to minimise vibration caused by the horizontal reciprocation of the drive member 33.
  • Rotation of the crank 38 causes reciprocation of the driver member 33 via the push rod 37 and subsequently this causes the tine leg to reciprocate substantially vertically.
  • Horizontal reciprocation of the end of the drive member 33 having the connection 36 is effectively damped by the rotation of the eccentric 57 so that a vertical throw of said end of the drive member 33 is much greater than a horizontal throw of said end.
  • Reciprocation is controlled in synchronisation with forward motion of the aerator such that a uniform pattern of holes is punched in the turf surface 52 as the aerator advances. As the implement moves forward with the tines 31 inserted in the ground, the tines move backward relative to the implement.
  • a tine 31 is mounted on a platform 81.
  • a spring 84 To an upper surface of the platform 81 is mounted a spring 84.
  • the platform 81 is pivotally mounted via a pin 82 to a bottom of the tine leg 35.
  • An arm 92 is connected perpendicularly to the tine leg 35.
  • a top of the spring 84 is connected to the arm. It will be appreciated that the invention is not limited to the application whereby a substantially vertical tine leg is pivotally connected 36 to the drive member 33.
  • a substantially vertical tine leg may be rigidly fixed to the drive member 33.
  • FIG. 7 illustrates the guide arrangement 139 as shown in Figures 2, 5 and 6.
  • the guide arrangement is provided for guiding the lower end of the tine leg 35 and to ensure the required insertion into, and retraction from, the surface 52 of the tine.
  • the guide arrangement comprises a first guide mechanism and a second guide mechanism.
  • the first guide mechanism includes a first arm 143, at the first end of which is a first pivot 140 which is mounted to the frame 32. At a second end of the first arm 143 is a first roller 144, which abuts the tine leg 35.
  • Attached to the first roller 144 is a first tension spring 152.
  • a first stop means 148 mounted to the frame 32 abuts the first arm 143 when the first roller 144 reaches a most forward position.
  • the stop means includes a resilient buffer to cushion the impact of the tine leg.
  • the second guide mechanism includes a second arm 141 with a second pivot point 142 which is mounted to the frame 32. At a first end of the second arm 141 is attached a tension spring 154 mounted to the frame 32. At a second end of the second arm 141 is attached a second roller 146 which abuts the tine leg 35.
  • a second stop means 150 mounted to the frame 32 abuts the second arm 141 to limit travel of the second roller 146 in the rearward direction.
  • a force exerted perpendicularly away from the lower end of the second arm 141 by the spring 154 will result in a clockwise rotation about the pivot point 142.
  • the clockwise rotation about the pivot point 142 will exert a rearward force on the tine leg 35 when the tine leg comes into contact with the second roller 146.
  • the ground spacing of holes created by the tines 31 can be varied.
  • chatter of the tine legs 35 is inhibited by means of the spring- biased rollers 142 and 144.
  • the tine legs 35 are also constrained against lateral movement by means of a lined bracket 112 through which the tine leg 35 passes.
  • the bracket 1 12 is slotted with a plastics lining 114 which is also self lubricating.
  • the lining 1 14 maybe PTFE.
  • FIGs 8A and 8B illustrate the foot assembly 80 as shown in Figure 2.
  • the foot assembly 80 is mounted to the tine leg 35.
  • the foot assembly 80 includes a first mounting member 87, and a second mounting member (not shown) which extend from a platform 81 and a tine leg 35 is pivotably connected between the first mounting member and the second mounting member.
  • Each tine leg is connected to the mounting member by a pin 82.
  • An arm 92 extends from the tine leg 35. Stopper 89 is mounted on the arm 92 and rests against the platform 81 when the platform 81 is at a first end of its pivotal travel.
  • a spring 84 is mounted on the platform 81 behind (in the direction of movement of the aerator 1 1) the tine leg 35.
  • the spring 84 is connected to an extremity of the arm 92.
  • Figure 8B illustrates the foot assembly 80 when the spring 84 is extended.
  • Second stoppers 88 are attached to a lip 87a of each mounting member.
  • Angle brackets 93 are mounted on the tine leg 35. Second stoppers
  • the pivoting foot assembly 80 of Figures 8A and 8B which carries the tine 31 , is intended to rotate while the tine is in the ground allowing the tine to remain substantially vertical while the tine leg 35 swings through an arc.
  • the foot pivots back to its original position under influence of the spring 84 when the tine leaves the ground.
  • an optional wedge shaped block 94 may be clamped between the tine leg 35 and the angle bracket 93 to hold the foot assembly 80 at one end of its travel relative to the tine leg 35.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Soil Working Implements (AREA)

Abstract

Turf aerator (11) has a reciprocating drive mechanism comprising a tine leg (35) pivotally mounte at an upper end to a drive assembly that reciprocates the tine leg (35). The drive assembly comprises a reciprocating driver member (33) to which the tine leg (35) is pivotally attached at a first point (36) along the drive member (33). The drive member (33) is pivotally connected at a second point (34) to the frame (32) of the aerator (11) and at a third point to a first arrangement comprises of a first roller (144) mounted on a first pivotable arm (143) biased to a forward position. A first stop means (148) mounted to the frame (32) acts to limit travel of the first roller (144) in a forward direction. Also disclosed are a tine leg (35) and a pivotable foot assembly (80) for carrying a tine (31). The assembly (80) includes a base plate (81), a pair of upwardly directed mounting brackets pivotably attached to the tine leg (35). At least one of the mounting brackets includes an extension projecting beyond the horizontal axis. The assembly (80) has an arm to limit pivotal travel of the base plate (81) in a first direction, spring means between the arm and the base plate (80), and a limiting member to limit pivotal travel of the base plate (80) in a second direction.
PCT/AU2002/000620 2001-05-21 2002-05-20 Mechanisme d'aerateur ameliore WO2002094000A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPR5150A AUPR515001A0 (en) 2001-05-21 2001-05-21 Improved aerator mechanism
AUPR5150 2001-05-21

Publications (1)

Publication Number Publication Date
WO2002094000A1 true WO2002094000A1 (fr) 2002-11-28

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ID=3829128

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2002/000620 WO2002094000A1 (fr) 2001-05-21 2002-05-20 Mechanisme d'aerateur ameliore

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WO (1) WO2002094000A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004043132A3 (fr) * 2002-11-12 2004-12-29 Toro Co Aerateur a conducteur a pied comprenant une tete de carottage suivant le sol, des roues interieures, un vilebrequin a parties multiples assemble, des deflecteurs de carottes solidaires et une profondeur de tete de carottage raccourcie
WO2008101292A1 (fr) * 2007-02-22 2008-08-28 Greencare Industries Pty Ltd Mécanisme d'aérateur avec dent à mouvement alternatif vertical
US10779454B2 (en) 2018-01-30 2020-09-22 Exmark Manufacturing Company, Incorporated Soil penetrating apparatus with depth control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400984A (en) * 1979-12-28 1983-08-30 Ab Volvo Handling mechanism for a rectilinear movement with connecting perpendicular movement segments at the ends
GB2318268A (en) * 1996-10-18 1998-04-22 Sisis Equip Tine Attachment means
WO2001047341A1 (fr) * 1999-12-23 2001-07-05 Greencare Pty Ltd Mecanisme de commande a deplacement alternatif pour aerateur de gazon

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400984A (en) * 1979-12-28 1983-08-30 Ab Volvo Handling mechanism for a rectilinear movement with connecting perpendicular movement segments at the ends
GB2318268A (en) * 1996-10-18 1998-04-22 Sisis Equip Tine Attachment means
WO2001047341A1 (fr) * 1999-12-23 2001-07-05 Greencare Pty Ltd Mecanisme de commande a deplacement alternatif pour aerateur de gazon

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004043132A3 (fr) * 2002-11-12 2004-12-29 Toro Co Aerateur a conducteur a pied comprenant une tete de carottage suivant le sol, des roues interieures, un vilebrequin a parties multiples assemble, des deflecteurs de carottes solidaires et une profondeur de tete de carottage raccourcie
US7096969B2 (en) 2002-11-12 2006-08-29 The Toro Company Walk aerator with inboard wheels
WO2008101292A1 (fr) * 2007-02-22 2008-08-28 Greencare Industries Pty Ltd Mécanisme d'aérateur avec dent à mouvement alternatif vertical
AU2008217571B2 (en) * 2007-02-22 2013-07-18 Greencare Industries Pty Ltd 'Aerator mechanism with vertically reciprocating tine'
US10779454B2 (en) 2018-01-30 2020-09-22 Exmark Manufacturing Company, Incorporated Soil penetrating apparatus with depth control
US11234353B2 (en) 2018-01-30 2022-02-01 Exmark Manufacturing Company, Incorporated Actuator assembly

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