Patent ID: 11917939
Assignee: NANJING CHERVON INDUSTRY CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC A | IPC A

Claim 14:
15. A blade assembly for a lawn mower, comprising:
a first blade comprising:
a first mounting portion provided with a first mounting hole for mounting the first blade about a blade rotation axis; and
a first blade proximal portion having a flat shape in a radial direction perpendicular to the blade rotation axis along an entire length of the first blade, the first blade proximal portion and the first blade mounting portion lying in a single plane, and the first blade proximal portion comprising a first cutting edge; and

a second blade comprising:
a second mounting portion provided with a second mounting hole for mounting the second blade in overlap with the first blade about the blade rotation axis;
a second blade proximal portion having a flat shape in a radial direction perpendicular to the blade rotation axis; and
a second blade outer portion positioned radially outside the second blade proximal portion and coupled to the second blade mounting portion by a transition portion,

wherein a distance between the second blade outer portion and the first blade is larger than a distance between the second blade proximal portion and the first blade,
wherein the blade assembly is configured to be rotatable about the blade rotation axis,
wherein at least the second blade outer portion and the flat transition portion both include a second cutting edge, and
wherein the first blade defines a first longitudinal axis and the second blade defines a second longitudinal axis and the first blade and the second blade are mounted about the blade rotation axis such that the first longitudinal axis and the second longitudinal axis are skewed
wherein the first blade comprises at least one first blade positioning hole defined in the first blade mounting portion in a first position relative to the first longitudinal axis and the second blade comprises at least one second blade positioning hole defined in the second blade mounting portion in a second position relative to the second longitudinal axis, a distance of the first position relative to the first longitudinal axis being different than a distance of the second position relative to the second longitudinal axis, and both the first positional hole and the second positioning hole are mountable to a positioning tab supported about the blade rotation axis to cause the first longitudinal axis and the second longitudinal axis to be skewed.