WO2000056137A1 - Steerable lawn mower - Google Patents

Steerable lawn mower Download PDF

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Publication number
WO2000056137A1
WO2000056137A1 PCT/FI2000/000232 FI0000232W WO0056137A1 WO 2000056137 A1 WO2000056137 A1 WO 2000056137A1 FI 0000232 W FI0000232 W FI 0000232W WO 0056137 A1 WO0056137 A1 WO 0056137A1
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WO
WIPO (PCT)
Prior art keywords
lawn mower
rotation axis
frame part
steering
angle
Prior art date
Application number
PCT/FI2000/000232
Other languages
French (fr)
Inventor
Erkki Keurulainen
Original Assignee
Erkki Keurulainen
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 Erkki Keurulainen filed Critical Erkki Keurulainen
Priority to AU35604/00A priority Critical patent/AU3560400A/en
Publication of WO2000056137A1 publication Critical patent/WO2000056137A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/001—Accessories not otherwise provided for
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D2101/00—Lawn-mowers

Definitions

  • the present invention relates to a steerable lawn mower as defined in the preamble of claim 1.
  • the invention concerns a rela- tively heavy four-wheel lawn mower driven by a combustion engine or an electric motor, of a type provided with a steering arm that allows the machine to be steered by a user walking behind or before it .
  • the lawn mower may be provided with driving wheels, or al- ternatively all the wheels may be non-driving, in which case the lawn mower is moved by pushing and pulling by the steering arm.
  • the object of the invention is to eliminate the drawbacks referred to above.
  • a specific object of the invention is to disclose a maneuverable lawn mower in which the structure facilitating swinging round is simple and advantageous in respect of manufacturing costs.
  • the features characteristic of the lawn mower of the invention reference is made to the claims .
  • the frame is divided into two parts turnable with respect to each other, a machine frame part, which is provided with a first pair of wheels and on which a motor and a mowing device are mounted, and a steering frame part turnably connected to the machine frame part and provided with a second pair of wheels.
  • the lawn mower comprises an angle lever for swivellable connection of the machine frame part and the steering frame part to each other, which angle lever is mounted on the machine frame part with a bearing allowing it to turn about a first rotation axis disposed at a first angle oblique to the horizontal plane, and which angle lever is mounted on the steering frame part with a bearing allowing it to turn about a second rotation axis disposed at a second angle oblique to the horizontal plane, the first and the second rotation axes lying in the same plane, with a third angle opening upward between them.
  • the steering arm is so connected to the angle lever that, by turning the angle lever by the steering arm, the steering frame part can be turned with respect to the machine frame part to steer the lawn mower.
  • the solution of the invention provides the advantage of allowing easy and light steering of the lawn mower.
  • the lawn mower is steered by rotating the steering arm, so the steering resembles the steering of a vehicle with a steering wheel. If the lawn mower is driven forward in a normal manner with the machine frame part comprising the mowing device moving fore- most while the user is walking behind it, steering the lawn mower by means of the steering arm, the user can walk at bends along the same path as the lawn mower, without having to step aside at all as in the case of present lawn mowers.
  • a further advantage is that the steering equipment is simple and cheap.
  • the steering structure is self-centering and self- righting so that the machine frame part and the steering frame part tend to return automatically from a bent swing position to a position for straight forward movement in which the middle planes of rotation of the first and the second wheel pairs are parallel to each other.
  • the steering arm is rigidly connected to the angle lever so that the longitudinal axis of the steering arm coincides with the second rotation axis. In an embodiment of the lawn mower, the steering arm is pivoted on the angle lever.
  • the steering arm is pivoted on the angle lever so that it can turn about a swiveling axis.
  • the swiveling axis is perpendicular to the plane defined by the first rotation axis and the second rotation axis and essentially at the intersection of the first rotation axis and the second rotation axis or in its vicinity.
  • the angle between the first rotation axis and the second rotation axis is smaller than 180°.
  • the angle between the first rotation axis and the second rotation axis is preferably larger than 90°.
  • the end of the steering arm is provided with a steering ring or the like to allow easier rotation.
  • the lawn mower comprises a locking device for preventing rota- tion of the angle lever about the first rotation axis and/or the second rotation axis.
  • the lawn mower comprises a rotation limit stop for limiting the angle of rotation of the angle lever about the first rotation axis and/or the second rotation axis.
  • the lawn mower comprises a swiveling limit stop for limiting the swiveling motion of the steering arm about the swiveling axis.
  • Fig. 1 presents a diagrammatic side view of a first embodiment of the lawn mower of the invention
  • Fig. 2 presents the lawn mower in Fig. 1 as seen from above
  • Fig. 3 presents a diagrammatic side view of a second embodiment of the lawn mower of the invention
  • Fig. 4 presents the lawn mower in Fig. 3 as seen from above
  • Fig. 5 presents a diagrammatic side view of a third embodiment of the lawn mower of the invention.
  • Fig 1 and 2 present a steerable lawn mower.
  • the frame of the lawn mower is divided into two parts turnable with respect to each other, i.e. a machine frame part l 1 and a steering frame part l 2 .
  • a first pair of wheels 2 comprising two wheels disposed at a distance from each other on opposite sides of the lawn mower is mounted with bearings on the machine frame part l 1 .
  • Mounted on the machine frame part l 1 is a mo- tor 4 and a mowing device 5 driven by the motor.
  • the steering frame part l 2 is turnably connected via an angle lever 7 to the machine frame part l 1 .
  • Mounted on the steering frame part l 2 is a second pair of wheels 3.
  • the angle lever 7 connects the machine frame part l 1 and the steering frame part l 2 turnably to each other.
  • the angle lever 7 is connected to the machine frame part l 1 via a first bearing 15 so that it can turn about a first rotation axis 8, which is at a first angle ⁇ oblique to the horizontal plane.
  • the angle lever 7 is connected to the steering frame part l 2 via a second bearing 16 in a manner permitting it to turn about a second rotation axis 8, which is at a second angle ⁇ oblique to the horizontal plane.
  • the angles ⁇ and ⁇ may be of equal or unequal magnitude.
  • the first rotation axis 8 and the second rotation axis 9 lie in the same plane (in a vertical plane in the position of forward movement in Fig. 2) and the third angle ⁇ between them opens upward.
  • a suitable size between 90° - 180° is selected. In the embodiments illustrated, the angle ⁇ is about 100°.
  • the steering arm 6 is connected directly to the angle lever 7 so that, by turning the angle lever 7 by means of the steering arm 6, the steering frame part l 2 is turned with respect to the machine frame part l 1 to steer the lawn mower.
  • the steering arm 6 is rigidly connected to the angle lever 7 so that the longitudinal axis of the steering arm coincides with the second rotation axis 9 and the steering arm forms an exten- sion of the angle lever 7.
  • the steering arm 6 is a straight pipe or bar extending upward at an oblique angle of about 35° - 40°, and its upper end is provided with a transverse steering ring 11 (Fig. 2), which can be gripped by hand, to facilitate rotation of the steering arm 6.
  • the embodiments in Fig. 3 - 5 differ from the embodiment in Fig. 1 and 2 in respect of the bearings supporting the angle lever 7 and the connection of the steering arm 6 to the steering arm 7.
  • the angle lever 7 is a short bar forming a bend, with its ends mounted via sliding or rolling bearings on the frame parts l 1 and l 2 .
  • the steering arm 6 is swivellably connected to the angle lever 7 so that it can swivel about a swiveling axis 10.
  • the swiveling axis 10 is perpendicular to the plane defined by the first rotation axis 8 and the second rotation axis 9, and it is located substantially at the intersection of the first rotation axis 8 and the second rotation axis 9 or in the immediate vicinity of the intersection so as to allow as easy swinging of the lawn mower as possible.
  • the lawn mower comprises a detachable and lockable locking device 12, by means of which the angle lever 7 can be locked in position to prevent its rotation about the first rotation axis 8, thus preventing the machine frame part and the steering frame part from turning with respect to each other.
  • the locking preferably locks the lawn mower in the position for forward movement.
  • the lawn mower is provided with a rotation limit stop 13, al- lowing the angle of rotation of the angle lever 7 to be limited.
  • the lawn mower is provided with a swiveling limit stop 14 which limits the swiveling motion of the steering arm 6 about the swiveling axis 10.
  • the invention is not restricted to the examples of its embodiments described above; instead, many variations are possible within the scope of the inventive idea defined in the claims.

Abstract

The invention concerns a steerable lawn mower. Its frame is divided into two parts turnable with respect to each other, a machine frame part (11) with a first pair of wheels (2) connected to it, a motor (4) and a mowing device (5) being mounted on the machine frame part, and a steering frame part (12) turnably connected to the machine frame part, with a second pair of wheels (3) mounted on the steering frame part. The lawn mower comprises an angle lever (7) for turnable connection of the machine frame part (11) and the steering frame part (12) to each other, which angle lever is mounted on the machine frame part (11) with a bearing allowing it to turn about a first rotation axis (8) disposed at a first angle (α) oblique to the horizontal plane, and which angle lever is mounted on the steering frame part with a bearing allowing it to turn about a second rotation axis (9) disposed at a second angle (β) oblique to the horizontal plane, the first rotation axis (8) and the second rotation axis (9) lying in the same plane, with a third angle (η) opening upward between them. The steering arm (6) is so connected to the angle lever (7) that, by turning the angle lever by means of the steering arm, the steering frame part is turned with respect to the machine frame part to steer the lawn mower.

Description

STEERABLE LAWN MOWER
The present invention relates to a steerable lawn mower as defined in the preamble of claim 1.
In particular, the invention concerns a rela- tively heavy four-wheel lawn mower driven by a combustion engine or an electric motor, of a type provided with a steering arm that allows the machine to be steered by a user walking behind or before it . The lawn mower may be provided with driving wheels, or al- ternatively all the wheels may be non-driving, in which case the lawn mower is moved by pushing and pulling by the steering arm.
Usually this known type of lawn mower has wheel shafts fixedly mounted with bearings on a common frame. Because of this, poor steerability is a problem with the prior-art type of lawn mower. Especially heavy self-driven lawn mowers provided with a grass catcher are difficult to steer.
The object of the invention is to eliminate the drawbacks referred to above.
A specific object of the invention is to disclose a maneuverable lawn mower in which the structure facilitating swinging round is simple and advantageous in respect of manufacturing costs. As for the features characteristic of the lawn mower of the invention, reference is made to the claims .
According to the invention, the frame is divided into two parts turnable with respect to each other, a machine frame part, which is provided with a first pair of wheels and on which a motor and a mowing device are mounted, and a steering frame part turnably connected to the machine frame part and provided with a second pair of wheels. The lawn mower comprises an angle lever for swivellable connection of the machine frame part and the steering frame part to each other, which angle lever is mounted on the machine frame part with a bearing allowing it to turn about a first rotation axis disposed at a first angle oblique to the horizontal plane, and which angle lever is mounted on the steering frame part with a bearing allowing it to turn about a second rotation axis disposed at a second angle oblique to the horizontal plane, the first and the second rotation axes lying in the same plane, with a third angle opening upward between them. The steering arm is so connected to the angle lever that, by turning the angle lever by the steering arm, the steering frame part can be turned with respect to the machine frame part to steer the lawn mower.
The solution of the invention provides the advantage of allowing easy and light steering of the lawn mower. The lawn mower is steered by rotating the steering arm, so the steering resembles the steering of a vehicle with a steering wheel. If the lawn mower is driven forward in a normal manner with the machine frame part comprising the mowing device moving fore- most while the user is walking behind it, steering the lawn mower by means of the steering arm, the user can walk at bends along the same path as the lawn mower, without having to step aside at all as in the case of present lawn mowers. A further advantage is that the steering equipment is simple and cheap. In addition, the steering structure is self-centering and self- righting so that the machine frame part and the steering frame part tend to return automatically from a bent swing position to a position for straight forward movement in which the middle planes of rotation of the first and the second wheel pairs are parallel to each other.
In an embodiment of the lawn mower, the steering arm is rigidly connected to the angle lever so that the longitudinal axis of the steering arm coincides with the second rotation axis. In an embodiment of the lawn mower, the steering arm is pivoted on the angle lever.
In an embodiment of the lawn mower, the steering arm is pivoted on the angle lever so that it can turn about a swiveling axis. The swiveling axis is perpendicular to the plane defined by the first rotation axis and the second rotation axis and essentially at the intersection of the first rotation axis and the second rotation axis or in its vicinity. In an embodiment of the lawn mower, the angle between the first rotation axis and the second rotation axis is smaller than 180°. The angle between the first rotation axis and the second rotation axis is preferably larger than 90°. In an embodiment of the lawn mower, the end of the steering arm is provided with a steering ring or the like to allow easier rotation.
In an embodiment of the lawn mower, the lawn mower comprises a locking device for preventing rota- tion of the angle lever about the first rotation axis and/or the second rotation axis.
In an embodiment of the lawn mower, the lawn mower comprises a rotation limit stop for limiting the angle of rotation of the angle lever about the first rotation axis and/or the second rotation axis.
In an embodiment of the lawn mower, the lawn mower comprises a swiveling limit stop for limiting the swiveling motion of the steering arm about the swiveling axis. In the following, the invention will be described in detail by the aid of a few examples of its embodiments with reference to the drawings, wherein
Fig. 1 presents a diagrammatic side view of a first embodiment of the lawn mower of the invention, Fig. 2 presents the lawn mower in Fig. 1 as seen from above, Fig. 3 presents a diagrammatic side view of a second embodiment of the lawn mower of the invention,
Fig. 4 presents the lawn mower in Fig. 3 as seen from above, and Fig. 5 presents a diagrammatic side view of a third embodiment of the lawn mower of the invention.
Fig 1 and 2 present a steerable lawn mower. The frame of the lawn mower is divided into two parts turnable with respect to each other, i.e. a machine frame part l1 and a steering frame part l2. A first pair of wheels 2 comprising two wheels disposed at a distance from each other on opposite sides of the lawn mower is mounted with bearings on the machine frame part l1. Mounted on the machine frame part l1 is a mo- tor 4 and a mowing device 5 driven by the motor. The steering frame part l2 is turnably connected via an angle lever 7 to the machine frame part l1. Mounted on the steering frame part l2 is a second pair of wheels 3. The angle lever 7 connects the machine frame part l1 and the steering frame part l2 turnably to each other. The angle lever 7 is connected to the machine frame part l1 via a first bearing 15 so that it can turn about a first rotation axis 8, which is at a first angle α oblique to the horizontal plane. The angle lever 7 is connected to the steering frame part l2 via a second bearing 16 in a manner permitting it to turn about a second rotation axis 8, which is at a second angle β oblique to the horizontal plane. The angles α and β may be of equal or unequal magnitude.
The first rotation axis 8 and the second rotation axis 9 lie in the same plane (in a vertical plane in the position of forward movement in Fig. 2) and the third angle γ between them opens upward. For the angle γ be- tween the first rotation axis 8 and the second rotation axis 9, a suitable size between 90° - 180° is selected. In the embodiments illustrated, the angle γ is about 100°. The steering arm 6 is connected directly to the angle lever 7 so that, by turning the angle lever 7 by means of the steering arm 6, the steering frame part l2 is turned with respect to the machine frame part l1 to steer the lawn mower. In the embodiments in Fig. 1 and 2, the steering arm 6 is rigidly connected to the angle lever 7 so that the longitudinal axis of the steering arm coincides with the second rotation axis 9 and the steering arm forms an exten- sion of the angle lever 7. The steering arm 6 is a straight pipe or bar extending upward at an oblique angle of about 35° - 40°, and its upper end is provided with a transverse steering ring 11 (Fig. 2), which can be gripped by hand, to facilitate rotation of the steering arm 6.
The embodiments in Fig. 3 - 5 differ from the embodiment in Fig. 1 and 2 in respect of the bearings supporting the angle lever 7 and the connection of the steering arm 6 to the steering arm 7. In the embodiments in Fig. 3 and 4, the angle lever 7 is a short bar forming a bend, with its ends mounted via sliding or rolling bearings on the frame parts l1 and l2. The steering arm 6 is swivellably connected to the angle lever 7 so that it can swivel about a swiveling axis 10. The swiveling axis 10 is perpendicular to the plane defined by the first rotation axis 8 and the second rotation axis 9, and it is located substantially at the intersection of the first rotation axis 8 and the second rotation axis 9 or in the immediate vicinity of the intersection so as to allow as easy swinging of the lawn mower as possible.
In the embodiment in Fig. 5, the angle lever
7 is connected to the frame parts l1 and l2 via thrust bearings. The connection of the steering arm 6 to the angle lever 7 is implemented in a manner corresponding to Fig. 3 and 4. In Fig. 5, the lawn mower comprises a detachable and lockable locking device 12, by means of which the angle lever 7 can be locked in position to prevent its rotation about the first rotation axis 8, thus preventing the machine frame part and the steering frame part from turning with respect to each other. The locking preferably locks the lawn mower in the position for forward movement. Furthermore, the lawn mower is provided with a rotation limit stop 13, al- lowing the angle of rotation of the angle lever 7 to be limited. To limit the swiveling of the steering arm 6, the lawn mower is provided with a swiveling limit stop 14 which limits the swiveling motion of the steering arm 6 about the swiveling axis 10. The invention is not restricted to the examples of its embodiments described above; instead, many variations are possible within the scope of the inventive idea defined in the claims.

Claims

1. Steerable lawn mower, comprising a frame (l1, l2) , a first pair of wheels (2) , a second pair of wheels (3) disposed at a distance from the first pair of wheels, a motor (4), a mowing device (5) driven by the motor, and a steering arm (6) for steering of the lawn mower, charac t eri z ed in that the frame is divided into two parts turnable with respect to each other, a machine frame part (l1) to which the first pair of wheels (2) is connected, the motor (4) and the mowing device (5) being mounted on the said machine frame part, and a steering frame part (l2) turnably connected to the machine frame part, the second pair of wheels (3) being mounted on the said steering frame part; the lawn mower comprises an angle lever (7) for turnable connection of the machine frame part (l1) and the steering frame part (l2) to each other, which angle lever is mounted on the machine frame part (l1) with a bearing allowing it to turn about a first rotation axis (8) disposed at a first angle (α) oblique to the horizontal plane, and which angle lever is mounted on the steering frame part with a bearing allowing it to turn about a second rotation axis (9) disposed at a second angle (β) oblique to the horizontal plane, the first rotation axis (8) and the second rotation axis (9) lying in the same plane, with a third angle (γ) opening upward between them; and that the steering arm (6) is so connected to the angle lever (7) that, by turning the angle lever by means of the steering arm, the steering frame part is turned with respect to the machine frame part to steer the lawn mower.
2. Lawn mower according to claim 1, char - act eri zed in that the steering arm (6) is rigidly connected to the angle lever (7) so that the Ion- gitudinal axis of the steering arm coincides with the second rotation axis (9) .
3. Lawn mower according to claim 1 , char ac t er i zed in that the steering arm (6) is piv- oted on the angle lever (7) .
4. Lawn mower according to claim 3 , char act e ri zed in that the steering arm (6) is pivoted on the angle lever (7) so that it can swivel about a swiveling axis (10) , and that the swiveling axis (10) is perpendicular to the plane defined by the first rotation axis (8) and the second rotation axis (9) and substantially at the intersection of the first rotation axis (8) and the second rotation axis (9) or in the vicinity of said intersection.
5. Lawn mower according to any one of claims
1 - 4, charac t eri zed in that the angle (γ) between the first rotation axis (8) and the second rotation axis (9) is smaller than 180°.
6. Lawn mower according to any one of claims 1 - 5, charac t eri z ed in that the angle (γ) between the first rotation axis (8) and the second rotation axis (9) is larger than 90°.
7. Lawn mower according to any one of claims 1 - 6, characteri zed in that the end of the steering arm (6) is provided with a steering ring (11) or the like to facilitate rotation of the steering arm.
8. Lawn mower according to any one of claims 1 - 7, charac t er i z ed in that the lawn mower comprises a locking device (12) for preventing rotation of the angle lever (7) about the first rotation axis (8) and/or about the second rotation axis (9) .
9. Lawn mower according to any one of claims 1 - 7, charac t eri z ed in that the lawn mower comprises a rotation limit stop (13) for limiting the angle of rotation of the angle lever (7) about the first rotation axis (8) and/or about the second rotation axis (9) .
10. Lawn mower according to any one of claims 1 - 7, characteri zed in that the lawn mower comprises a swiveling limit stop (14) for limiting the swiveling motion of the steering arm (6) about the swiveling axis (10) .
PCT/FI2000/000232 1999-03-22 2000-03-21 Steerable lawn mower WO2000056137A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35604/00A AU3560400A (en) 1999-03-22 2000-03-21 Steerable lawn mower

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990639A FI105766B (en) 1999-03-22 1999-03-22 Controllable lawn mower
FI990639 1999-03-22

Publications (1)

Publication Number Publication Date
WO2000056137A1 true WO2000056137A1 (en) 2000-09-28

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ID=8554257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000232 WO2000056137A1 (en) 1999-03-22 2000-03-21 Steerable lawn mower

Country Status (3)

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AU (1) AU3560400A (en)
FI (1) FI105766B (en)
WO (1) WO2000056137A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1461990A1 (en) * 2003-03-26 2004-09-29 Al-Ko Kober Ag Steerable motor driven lawn mower
WO2006027218A1 (en) * 2004-09-07 2006-03-16 Al-Ko Kober Ag Manual lawn mower
WO2012177197A1 (en) * 2011-06-22 2012-12-27 Husqvarna Ab Walk behind garden tool chassis

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382653A (en) * 1964-10-16 1968-05-14 Buigne Frank De Power driven rotary mower
US3780504A (en) * 1971-03-29 1973-12-25 F Haseloff Lawn mower
US5297379A (en) * 1992-03-09 1994-03-29 Fuqua Industries Walk-behind lawn mower with front wheel steering
EP0976317A1 (en) * 1998-06-16 2000-02-02 Black & Decker Inc. Wheel mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382653A (en) * 1964-10-16 1968-05-14 Buigne Frank De Power driven rotary mower
US3780504A (en) * 1971-03-29 1973-12-25 F Haseloff Lawn mower
US5297379A (en) * 1992-03-09 1994-03-29 Fuqua Industries Walk-behind lawn mower with front wheel steering
EP0976317A1 (en) * 1998-06-16 2000-02-02 Black & Decker Inc. Wheel mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1461990A1 (en) * 2003-03-26 2004-09-29 Al-Ko Kober Ag Steerable motor driven lawn mower
WO2006027218A1 (en) * 2004-09-07 2006-03-16 Al-Ko Kober Ag Manual lawn mower
DE102004057043A1 (en) * 2004-09-07 2006-03-23 Al-Ko Kober Ag Hand-held lawnmower
WO2012177197A1 (en) * 2011-06-22 2012-12-27 Husqvarna Ab Walk behind garden tool chassis
CN103619160A (en) * 2011-06-22 2014-03-05 胡斯华纳有限公司 Walk behind garden tool chassis
US8899006B2 (en) 2011-06-22 2014-12-02 Husqvarna Ab Walk behind garden tool chassis
CN103619160B (en) * 2011-06-22 2015-08-26 胡斯华纳有限公司 Walk behind garden tool chassis

Also Published As

Publication number Publication date
AU3560400A (en) 2000-10-09
FI990639A0 (en) 1999-03-22
FI105766B (en) 2000-10-13

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