# US 9,516,808 B2 · Grass mower

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- Number: US 9,516,808 B2
- Document ID: US9516808B2
- Status: Granted
- Kind: B2
- Application number: 14/837,443
- Filed: 2015-08-27
- Published: 2016-07-07
- Granted: 2016-12-13
- Earliest claimed: 2015-01-06
- Assignees: Kubota Corporation
- Applicants: Kubota Corporation
- Inventors: Masaki Takaoka; Masato Asahara; Motosumi Shiotsuki; Hideki Aoki; Kazuaki Nogami; Akira Minoura
- Web page: https://patentgrep.com/patent/US9516808B2

## CPC

- A01D 34/66: with two or more cutters
- A01D 34/733: {Cutting-blade mounting means}
- A01D 2101/00: Lawn-mowers
- A01D: HARVESTING; MOWING

## Abstract

The grass mower includes a front wheel unit having a left front wheel and a right front wheel which are mounted to a vehicle body frame, a rear wheel unit having a left rear wheel and a right rear wheel which are mounted to the vehicle body frame and a mower unit disposed between the front wheel unit and the rear wheel unit downwardly of the vehicle body frame, the mower unit including a rotary blade unit that has at least a left blade and a right blade which are disposed side by side in a vehicle body left/right direction. The rotary blade unit is configured such that a tread-on track of the left front wheel is overlapped with a rotation locus portion of the left blade from the front side to the rear side thereof and a tread-on track of the right front wheel is overlapped with a rotation locus portion of the right blade from the front side to the rear side thereof.

## Claims

### Claim 1

A grass mower comprising:
a vehicle body frame extending along a centerline of a vehicle body front/rear direction;
a front wheel unit having a left front wheel and a right front wheel which are mounted to the vehicle body frame;
a rear wheel unit having a left rear wheel and a right rear wheel which are mounted to the vehicle body frame; and
a mower unit disposed between the front wheel unit and the rear wheel unit downwardly of the vehicle body frame, the mower unit including a rotary blade unit that has at least a left blade and a right blade which are disposed side by side in a vehicle body left/right direction;
wherein the rotary blade unit is configured such that a tread-on track of the left front wheel as seen in the plane view is overlapped with a rotation locus portion of the left blade from the front side to the rear side thereof and a tread-on track of the right front wheel as seen in the plane view is overlapped with a rotation locus portion of the right blade from the front side to the rear side thereof; and
wherein the left front wheel and the right front wheel have a center position that is equidistant from the left front wheel and the right front wheel the center position being offset from the centerline of the vehicle body front/rear direction; and
a center of a running track of the left front wheel is confined within a width of the left rear wheel and a center of a running track of the right front wheel is confined within a width of the right rear wheel.

### Claim 2 (depends on 1)

The grass mower according to claim 1, wherein:
a front-wheel connecting arm extends in the vehicle body left/right direction to interconnect the left front wheel and the right front wheel;
a front-wheel pivot axis extending in the vehicle body front/rear direction is arranged on the centerline in the vehicle body front/rear direction; and
the front wheel unit is pivoted by pivoting the front-wheel connecting arm.

### Claim 3 (depends on 1)

The grass mower according to claim 1, wherein:
the mower unit further includes a center blade between the left blade and the right blade;
a rotational shaft of the center blade is offset from the vehicle body front/rear centerline; and
a distance between the rotational shaft of the center blade and a rotational shaft of the left blade is arranged at a same distance as a distance between the rotational shaft of the center blade and a rotational shaft of the right blade.

### Claim 4 (depends on 3)

The grass mower according to claim 3, wherein:
a direction of the offset of the rotational shaft of the center blade relative to the vehicle body front/rear centerline is set opposite to a direction of the offset of the center position between the left front wheel and the right front wheel relative to the vehicle body front/rear direction centerline.

### Claim 5 (depends on 3)

The grass mower according to claim 3, wherein:
a center position between the left rear wheel and the right rear wheel is aligned with the centerline of the vehicle body front/rear direction; and
an output shaft of an engine which is disposed rearwardly of the rear wheel unit is aligned with the vehicle body front/rear direction centerline.