# US 2014/0196428 A1 · Mower blade > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196428 A1 - Document ID: US20140196428A1 - Status: Published application - Kind: A1 - Application number: 14/015,111 - Filed: 2013-08-30 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: Kubota Corporation - Applicants: Kubota Corporation - Inventors: Motosumi SHIOTSUKI; Akira MINOURA; Kazuo KOIKE; Hirokazu ITO - Web page: https://patentgrep.com/patent/US20140196428A1 ## CPC - A01D 34/73: Cutting apparatus - A01D: HARVESTING; MOWING ## Abstract Mower blade utilizes a blade portion formed on the blade main body and an air circulator portion formed on the blade main body and generating airflow via rotation centered around the vertically-oriented axis of the mower blade. The blade portion is arranged in a length-direction end portion of the blade main body and extends along a predetermined area in the length-direction. The air circulator portion is located opposite the blade portion in a width direction, has a rising upward portion, and extends along a predetermined area in the length-direction. A boundary portion is arranged between the blade main body and a rising upward portion of the air circulator portion has a portion inclined or angled with respect to the blade portion such that, beginning at the length-direction end portion, a distance between the boundary portion and the blade portion increases along the length-direction and moving toward the vertically-oriented axis. A height of an upper end portion of the air circulator portion measured from a surface of the blade main body is a substantially constant height. ## Claims ### Claim 1 A mower blade rotatably driven and centered around a vertically-oriented axis in an interior of a housing, comprising: a blade main body having a length-direction; a blade portion formed on the blade main body; and an air circulator portion formed on the blade main body and generating airflow via rotation centered around the vertically-oriented axis of the mower blade; the blade portion is arranged in a length-direction end portion of the blade main body and extends along a predetermined area in the length-direction; the air circulator portion is located opposite the blade portion in a width direction, has a rising upward portion, and extends along a predetermined area in the length-direction; a boundary portion arranged between the blade main body and a rising upward portion of the air circulator portion has a portion inclined or angled with respect to the blade portion such that, beginning at the length-direction end portion, a distance between the boundary portion and the blade portion increases along the length-direction and moving toward the vertically-oriented axis; and a height of an upper end portion of the air circulator portion measured from a surface of the blade main body is a substantially constant height. ### Claim 2 (depends on 1) The mower blade according to claim 1, wherein a distance between a tip of the blade portion and a position where the boundary portion extends to a length-direction end portion, measured along the width direction, is substantially equal to a distance between an imaginary center line of the blade main body extending along the length-direction and the tip of the blade portion. ### Claim 3 (depends on 1) The mower blade according to claim 1, wherein the boundary portion has a second portion inclined or angled by a greater amount that the portion of the boundary portion. ### Claim 4 A mower blade, comprising: a blade main body having a length-direction and opposite first and second cutting ends; each of the first and second ends comprising: an air circulator portion arranged opposite a cutting portion; the cutting portion being arranged in a length-direction end portion of the blade main body and extending along a predetermined area in the length-direction; and a boundary line defined by where the air circulator portion meets a surface of the blade main body extends along the length-direction and at an angle, wherein a distance between the boundary line at an outer end of the blade main body and a tip of the cutting portion is less than a distance between the boundary line and the cutting portion at a position spaced from the outer end, and wherein a height of an upper end portion of the air circulator portion, measured from the surface of the blade main body, is a substantially constant height over a predetermined length. ### Claim 5 (depends on 4) The mower blade according to claim 4, wherein a length of the cutting portion is greater than a length of the air circulator portion measured along the length-direction. ### Claim 6 A mower blade, comprising: a blade main body a centrally disposed mounting hole, a length-direction and oppositely arranged first and second cutting ends; each of the first and second ends comprising: an air circulator portion arranged opposite a cutting portion; and a boundary line defined by where the air circulator portion meets a surface of the blade main body extends along the length-direction and at an angle that is not parallel to an imaginary centerline of the blade main body passing through a center of the mounting hole and extending along the length-direction, wherein the distance between a first portion of the boundary line and the imaginary center line changes continuously by a first amount and the distance between a second portion of the boundary line and the imaginary center line changes continuously by a second different amount. ### Claim 7 (depends on 6) The mower blade according to claim 6, wherein a height of an upper end portion of the air circulator portion measured from the surface of the blade main body is a substantially constant height over a predetermined length. ### Claim 8 (depends on 6) The mower blade according to claim 6, wherein a length of the cutting portion is greater than a length of the air circulator portion measured along the length-direction. ### Claim 9 (depends on 6) The mower blade according to claim 6, wherein a distance between all portions of the boundary line and the imaginary center line changes continuously. ### Claim 10 (depends on 6) The mower blade according to claim 6, wherein the air circulator portion comprises: a main air circulator portion; a smaller area air circular portion; and a boundary line arranged between the main air circulator portion and the smaller area air circulator portion. ### Claim 11 (depends on 10) The mower blade according to claim 10, wherein a height of an upper end portion of the main air circulator portion measured from the surface of the blade main body is a substantially constant height over a predetermined length. ### Claim 12 (depends on 10) The mower blade according to claim 10, wherein a height of an upper end portion of the smaller area air circulator portion measured from the surface of the blade main body changes continuously over a predetermined length.