Means for adjusting cutting height of a powered lawn mower

Patent metadata

Field	Value
Publication number	US-11844308-B2
Application number	US-202117363960-A
Country	US
Kind code	B2
Filing date	Jun 30, 2021
Priority date	Jul 6, 2020
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

A lawn mower may include a cutter propulsion unit, a transmission axle that may have a longitudinal extension and may be adapted to be rotated by the cutter propulsion unit. The lawn mower may further include a cutting disc that may have a radial extension (R) that runs between a center and an outer edge, where the cutting disc may include one or more cutting edges that may be adapted to cut grass when the cutting disc may be brought into a rotational motion by means of the transmission axle. The cutting disc may further include a connection portion which may be adapted to receive a coupling member, which may be included in the transmission axle, in at least two different mounting positions that may be adapted to position the connection portion in mutually separated positions along the longitudinal extension (L, L′).

First claim

The invention claimed is:

1. A lawn mower comprising:
a cutter propulsion unit,
a transmission axle adapted to be rotated by the cutter propulsion unit, the transmission axle comprising a longitudinal extension and a coupling member, and
a cutting disc comprising a radial extension that runs between a center and an outer edge of the cutting disc,
wherein the cutting disc comprises one or more cutting edges adapted to cut grass when the cutting disc is brought into-a rotational motion via the transmission axle and the cutter propulsion unit,
wherein the cutting disc further comprises a connection portion adapted to receive the coupling member, in at least two different mounting positions radially separated around the longitudinal extension,
wherein the at least two different mounting positions comprises at least two engagement plateau arrangements which are radially separated around a vertical extension that is coaxial with the longitudinal extension and perpendicular to the radial extension, and
wherein each of the engagement plateau arrangements comprises two opposing surfaces mutually separated opposite the vertical extension from each other, against which the coupling member is adapted to rest, and
wherein the two opposing surfaces of the each of the engagement plateau arrangements are disposed in a same plane to define a certain grass cutting height of the cutting disc.

2. The lawn mower according to claim 1 , wherein each engagement plateau arrangement is adapted to receive the coupling member comprised in the transmission axle in the two opposing surfaces such that the cutting disc obtains a certain vertical position along the vertical extension in dependence of which engagement plateau arrangement that has received the coupling member, corresponding to the certain grass cutting height.

3. The lawn mower according to claim 1 , wherein the coupling member is adapted to be in contact with the two opposing surfaces of at least one engagement plateau arrangement simultaneously.

4. The lawn mower according to claim 1 , wherein each engagement plateau arrangement comprises at least one fastening aperture, wherein the coupling member comprises at least one corresponding at least partially threaded bore, each bore being adapted to receive a corresponding screw that runs via the corresponding fastening aperture and is adapted to secure the coupling member to the cutting disc.

5. The lawn mower according to claim 1 , wherein the connection portion comprises coherent arcuate wall portions that encompass surfaces of the engagement plateau arrangements against which the coupling member is adapted to rest.

6. The lawn mower according to claim 1 , the coupling member comprises a first connection rod and a second connection rod, wherein the second connection rod is adapted to be positioned closer to the cutter propulsion unit than the first connection rod, wherein the connection portion comprises a first slot and a second slot, wherein the first slot is adapted to be positioned closer to the ground in a running condition than the second slot along a vertical extension that runs perpendicular to the radial extension, wherein the first slot is adapted to receive the first connection rod and the second slot is adapted to receive both the first connection rod and the second connection rod.

7. The lawn mower according to claim 6 , wherein the coupling member is secured to the connection portion by means of screws that run via fastening apertures in the connection portion and are secured to corresponding at least partially threaded bores of the connection rod that is received in the second slot.

8. A lawn mower cutting disc comprising:
a radial extension that runs between a center and an outer edge, and
one or more cutting edges adapted to cut grass when the cutting disc is brought into rotational motion via a transmission axle comprising a longitudinal extension and a coupling member,
wherein the cutting disc further comprises a connection portion adapted to receive the coupling member, in at least two different mounting positions radially separated around the longitudinal extension,
wherein the at least two different mounting positions comprises at least two engagement plateau arrangements radially separated around a vertical extension that runs is coaxial with the longitudinal extension and perpendicular to the radial extension, and
wherein each of the engagement plateau arrangements comprises two opposing surfaces mutually separated opposite the vertical extension from each other, against which the coupling member is adapted to rest, and
wherein the two opposing surfaces of the each of the engagement plateau arrangements are disposed in a same plane to define a certain grass cutting height of the cutting disc.

9. The lawn mower cutting disc according to claim 8 , wherein each engagement plateau arrangement is adapted to receive the coupling member comprised in the transmission axle such that the cutting disc can obtain a certain vertical position along the vertical extension in dependence of which engagement plateau arrangement that has received the coupling member, corresponding to the certain grass cutting height.

10. The lawn mower cutting disc according to claim 8 , wherein the coupling member is in contact with the two opposing surfaces of at least one engagement plateau arrangement simultaneously within the connection portion.

11. The lawn mower cutting disc according to claim 8 , wherein each engagement plateau arrangement comprises at least one fastening aperture adapted to admit a screw to pass, enabling the coupling member to be secured to the lawn mower cutting disc.

12. The lawn mower cutting disc according to claim 8 , wherein the connection portion comprises coherent arcuate wall portions that encompass surfaces of the engagement plateau arrangements.

13. The lawn mower cutting disc according to claim 8 , wherein the connection portion comprises a first slot and a second slot, wherein, in a running condition, the first slot is adapted to be positioned closer to the ground than the second slot along a vertical extension that runs perpendicular to the radial extension, wherein the first slot is adapted to receive a first connection rod and the second slot is adapted to receive both the first connection rod and a second connection rod, the connection rods being comprised in the transmission axle.

14. A lawn mower transmission axle comprising:
a transmission axle rod comprising a longitudinal extension and a coupling member,
wherein the transmission axle rod is adapted to be rotated about the longitudinal extension by a cutter propulsion unit,
wherein the coupling member is adapted to operably couple to a lawn mower cutting disc via a connection portion of the cutting disc comprising at least two different mounting positions radially separated around the longitudinal extension,
wherein the coupling member comprises two cylindrical members disposed on opposite sides of the longitudinal extension from each other, each cylindrical member comprising an axial extension that is parallel to the longitudinal extension,
wherein the at least two different mounting positions comprise at least two engagement plateau arrangements radially separated around a vertical extension that is coaxial with the longitudinal extension,
wherein each of the engagement plateau arrangements comprises two opposing surfaces disposed on opposite sides of a vertical extension from each other, against which the two cylindrical members are adapted to rest, and
wherein the two opposing surfaces of the each of the engagement plateau arrangements are disposed in a s

Assignees

• Husqvarna Ab

Inventors

• Björn Jonathan

Classifications

• A01D34/74 Primary

  Cutting-height adjustment · CPC title

• A01D34/008

  for automated or remotely controlled operation · CPC title

• A01D34/76

  Driving mechanisms for the cutters · CPC title

• A01D2101/00

  Lawn-mowers · CPC title

• A01D34/63 Primary

  having cutters rotating about a vertical axis · CPC title