Blade for a mowing unit for a lawnmower and/or a motor scythe, mowing unit for a lawnmower and/or a motor scythe, and lawnmower and/or motor scythe

Patent metadata

Field	Value
Publication number	US-12376518-B2
Application number	US-202117454700-A
Country	US
Kind code	B2
Filing date	Nov 12, 2021
Priority date	Nov 13, 2020
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A blade for a mowing unit for a lawnmower and/or a motor scythe is substantially parallelogram-shaped. The blade has a slot, wherein the slot is designed to receive a blade-holding element of the mowing unit such that the blade can rotate about the blade-holding element and move in translation relative to the blade-holding element for one cutting position of the blade defined by one end of the slot having one cutting orientation of the blade and another cutting position of the blade defined by another end of the slot having another cutting orientation of the blade. A line segment delimited by the ends of the slot does run non-parallel to sides of the parallelogram, and the parallelogram has an obtuse internal angle.

First claim

What is claimed is:

1. A blade for a mowing unit for a lawnmower and/or a motor scythe, comprising:
a substantially parallelogram-shaped blade;
wherein the blade has a slot,
wherein the slot is designed to receive a blade-holding element of the mowing unit such that the blade is rotatable about the blade-holding element and movable in translation relative to the blade-holding element for one cutting position of the blade defined by one end of the slot having one cutting orientation of the blade and another cutting position of the blade defined by another end of the slot having another cutting orientation of the blade,
wherein a line segment delimited by the one and another ends of the slot does run non-parallel to sides of the parallelogram,
wherein the parallelogram has an obtuse internal angle, and

wherein at least one of:
the ends of the slot are each closer to a respective corner of a minor diagonal of the parallelogram than to corners of a major diagonal of the parallelogram, or
a minor-diagonal angle between the line segment and the minor diagonal of the parallelogram is smaller than a major-diagonal angle between the line segment and the major diagonal of the parallelogram.

2. The blade according to claim 1 ,
wherein the blade has cutting edges at at least two opposite sides of the parallelogram, and
wherein the slot is designed such that the blade can cut with one of the cutting edges with the one cutting orientation and can cut with another of the cutting edges with the other cutting orientation.

3. The blade according to claim 2 ,
wherein the at least two opposite sides are long sides of the parallelogram.

4. The blade according to claim 1 ,
wherein the slot is straight.

5. The blade according to claim 1 ,
wherein the slot is designed such that the cutting orientations of the blade are rotated with respect to one another.

6. The blade according to claim 5 ,
wherein the cutting orientations are rotated through substantially 180° with respect to one another.

7. The blade according to claim 1 ,
wherein the line segment runs through a center of mass of the blade.

8. The blade according to claim 1 ,
wherein the line segment runs with point symmetry and/or twofold rotational symmetry in the blade.

9. The blade according to claim 1 , wherein
the line segment runs between the minor diagonal of the parallelogram and the major diagonal of the parallelogram.

10. The blade according to claim 1 ,
wherein adjacent sides of the parallelogram have different lengths.

11. The blade according to claim 10 ,
wherein a short-orthogonal angle between the line segment and a short orthogonal orthogonal to short sides of the parallelogram is smaller than a long-orthogonal angle between the line segment and a long orthogonal orthogonal to long sides of the parallelogram.

12. The blade according to claim 1 , wherein at least one of:
long sides of the parallelogram have a length of at least 20 mm or at most 160 mm,
short sides of the parallelogram have a length of at least 10 mm or at most 80 mm,
the slot has a length of at least 7.5 mm or at most 30 mm,
the obtuse internal angle is at least 95° or at most 120°,
a minor-diagonal angle between the line segment and a minor diagonal of the parallelogram is at least 10° or at most 40°,
a major-diagonal angle between the line segment and a major diagonal of the parallelogram is at least 15° or at most 75°,
a short-orthogonal angle between the line segment and a short orthogonal orthogonal to short sides of the parallelogram is at least 2.5° or at most 10°, or
a long-orthogonal angle between the line segment and a long orthogonal orthogonal to long sides of the parallelogram is at least 70° or at most 85°.

13. A mowing unit for a lawnmower and/or a motor scythe, comprising:
at one blade according to claim 1 ; and
a blade-holding device, wherein
the blade-holding device has at least one blade-holding element for holding the at least one blade, and
the blade-holding device is designed to rotate about a mowing-unit axis of rotation of the mowing unit.

14. The mowing unit according to claim 13 ,
wherein the blade-holding element is arranged in a manner spaced apart from the mowing-unit axis of rotation in a radial direction orthogonal to the mowing-unit axis of rotation.

15. The mowing unit according to claim 13 ,
wherein the parallelogram is formed in such a way and the ends of the slot are arranged in the blade in such a way that during holding by the blade-holding element and during rotation of the mowing unit, the mowing-unit axis of rotation has substantially equal spacings from two respective remote corners of the parallelogram in the one cutting position of the blade having the one cutting orientation of the blade and/or in the other cutting position of the blade having the other cutting orientation of the blade, and
wherein the spacings are at least 80 mm or at most 640 mm.

16. The mowing unit according to claim 13 ,
wherein the parallelogram is formed in such a way and the ends of the slot are arranged in the blade in such a way that during holding by the blade-holding element and during rotation of the mowing unit, a long side of the parallelogram runs substantially in a radial direction orthogonal to the mowing-unit axis of rotation in the one cutting position of the blade having the one cutting orientation of the blade and/or in the other cutting position of the blade having the other cutting orientation of the blade.

17. A lawnmower and/or motor scythe comprising a mowing unit according to claim 13 .

18. The lawnmower and/or motor scythe according to claim 17 ,
wherein the parallelogram is formed in such a way and the ends of the slot are arranged in the blade in such a way that during holding by the blade-holding element and during rotation of the mowing unit, a long side of the parallelogram runs substantially in a radial direction orthogonal to the mowing-unit axis of rotation in the one cutting position of the blade having the one cutting orientation of the blade and/or in the other cutting position of the blade having the other cutting orientation of the blade, and
wherein the lawnmower and/or the motor scythe are/is designed to rotate the mowing unit with the blade with the side running substantially in the radial direction at the front at least at times.

19. A blade for a mowing unit for a lawnmower and/or a motor scythe, comprising:
a substantially parallelogram-shaped blade;
wherein the blade has a slot,
wherein the slot is designed to receive a blade-holding element of the mowing unit such that the blade is rotatable about the blade-holding element and movable in translation relative to the blade-holding element for one cutting position of the blade defined by one end of the slot having one cutting orientation of the blade and another cutting position of the blade defined by another end of the slot having another cutting orientation of the blade,
wherein a line segment delimited by the one and another ends of the slot does run non-parallel to sides of the parallelogram,
wherein the parallelogram has an obtuse internal angle,
wherein the obtuse internal angle is at least 95° and at most 120°, and

wherein at least one of:
the ends of the slot are each closer to a respective corner of a minor diagonal of the parallelogram than to corners of a major diagonal of the parallelogram, or
a minor-diagonal angle between the line segment and the minor diagonal of the parallelogram is smaller than a major-diagonal angle betw

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Elfner Joerg
• Strotmes Simon Schulte
• Gassner Markus
• Fiebig Marko
• Wolf Philip

Classifications

• A01D2101/00

  Lawn-mowers · CPC title

• A01D34/82

  Other details · CPC title

• A01D34/733 Primary

  Cutting-blade mounting means · CPC title

• A01D34/736 Primary

  Flail type · CPC title

• A01D34/73 Primary

  Cutting apparatus · CPC title