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

Claim 0:
1. A blade assembly for a lawn mower, the blade assembly comprising:
an upper blade having an upper blade mounting portion defining an upper blade mounting hole for perpendicularly mounting the upper blade about a blade rotation axis and an upper blade proximal portion positioned outward from the upper blade mounting portion in a radial direction, the upper blade proximal portion being flat and coplanar along an entire length of the upper blade and including a first cutting edge; and
a lower blade having a lower blade mounting portion defining a lower blade mounting hole for mounting the lower blade in overlap with the upper blade about the blade rotation axis, the lower blade further comprising a lower blade proximal portion positioned outward from the lower blade mounting portion in a radial direction, a lower blade end portion positioned outward from the lower blade proximal portion and below the lower blade proximal portion, and the lower blade end portion includes a second cutting edge,
wherein the lower blade includes a falling portion that transitions from the lower blade proximal portion to the lower blade end portion, the falling portion being proximate the first cutting edge,
wherein the upper blade defines a first longitudinal axis and the lower blade defines a second longitudinal axis and the upper blade and the lower blade are mounted about the blade rotation axis such that the first longitudinal axis and the second longitudinal axis are skewed, and
wherein the upper blade comprises at least one upper blade positioning hole defined in the upper blade mounting portion in a first position relative to the first longitudinal axis and the lower blade comprises at least one lower blade positioning hole defined in the lower 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.