# US 11,997,945 B2 · Hand push lawn mower with a height adjustment assembly

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- Number: US 11,997,945 B2
- Document ID: US11997945B2
- Status: Granted
- Kind: B2
- Application number: 17/134,670
- Filed: 2020-12-28
- Published: 2021-04-22
- Granted: 2024-06-04
- Earliest claimed: 2019-06-28
- Assignees: Nanjing Chervon Industry Co., Ltd.
- Applicants: Nanjing Chervon Industry Co., Ltd.
- Inventors: Fangjie Nie; Toshinari Yamaoka; Haishen Xu; Qingsong Sun; Dezhong Yang; Chao Xian
- Web page: https://patentgrep.com/patent/US11997945B2

## CPC

- A01D 34/74: Cutting-height adjustment
- A01D 34/69: with motor driven wheels
- B25F 5/00: Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- A01D 34/78: electric
- A01D 34/81: Casings; Housings (A01D34/71 takes precedence)
- A01D 69/02: electric
- A01D 2034/6843: {Control levers on the handle of the mower}
- A01D 2101/00: Lawn-mowers
- A01D: HARVESTING; MOWING
- B25F: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR {(machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass B23P23/00 and subgroups)}

## Abstract

A hand push lawn mower includes a body including a cutting blade and an operating device for a user to operate and connected to the body. The body includes a deck, a motor, a height adjustment assembly and a grass baffle. The motor is configured to drive the cutting blade to rotate. The height adjustment assembly is used to adjust the deck to move up and down. The grass baffle is configured to prevent grass clippings from splashing towards the back of the hand push lawn mower. When the height adjustment assembly adjusts the height of the deck, a displacement of the grass baffle in a vertical direction is less than a displacement of the deck in the vertical direction.

## Claims

### Claim 1

A hand push lawn mower, comprising:
a body comprising a cutting blade, a deck, a motor coupled to drive the cutting blade to rotate, a height adjustment assembly coupled to the deck to selectively move the deck up and down, and a grass baffle located to prevent grass clippings from splashing towards a back of the hand push lawn mower;
the body further comprises a walking assembly including walking wheels and a first drive shaft to drive the walking wheels to rotate, the grass baffle is mounted to a second drive shaft rotatable with respect to the first drive shaft, when the height adjustment assembly adjusts the height of the deck, a displacement of the grass baffle in a vertical direction is less than a displacement of the deck in the vertical direction.

### Claim 2 (depends on 1)

The hand push lawn mower of claim 1, when the height adjustment assembly adjusts the height of the deck, the displacement of the grass baffle in the vertical direction is less than half of the displacement of the deck in the vertical direction.

### Claim 3 (depends on 1)

The hand push lawn mower of claim 1, the height adjustment assembly comprises the second drive shaft for driving the deck to move, an adjustment handle for a user to operate, and a link mechanism connecting the adjustment handle and the second drive shaft.

### Claim 4 (depends on 3)

The hand push lawn mower of claim 3, wherein the second drive shaft is parallel to the first drive shaft.

### Claim 5 (depends on 4)

The hand push lawn mower of claim 4, wherein the height adjustment assembly further comprises a connecting piece that is rotatably connected to the walking wheels, and the connecting piece forms a rotatable connection with the first drive shaft and a fixed connection with the second drive shaft.

### Claim 6 (depends on 5)

The hand push lawn mower of claim 5, wherein a ratio of a distance from the first drive shaft to a center of the walking wheels to a distance of the second drive shaft to the center of the walking wheels is about 1.52.

### Claim 7 (depends on 5)

The hand push lawn mower of claim 5, wherein a distance from the first drive shaft to a center of the walking wheels is greater than a distance of the second drive shaft to the center of the walking wheels.

### Claim 8 (depends on 3)

The hand push lawn mower of claim 3, wherein the second drive shaft is eccentrically arranged with respect to an axis of rotation of the walking wheels.

### Claim 9

A hand push lawn mower, comprising:
a body comprising a cutting blade, a deck, a motor coupled to drive the cutting blade to rotate, a height adjustment assembly to adjust the deck to move up and down, and a grass baffle mounted to prevent grass clippings from splashing towards a back of the hand push lawn mower;
when the height adjustment assembly adjusts the height of the deck, a position of the grass baffle remains substantially unchanged in a vertical direction.

### Claim 10 (depends on 9)

The hand push lawn mower of claim 9, the body further comprises a walking assembly comprising walking wheels and a first drive shaft for driving the walking wheels to rotate, and the grass baffle is mounted to the first drive shaft.

### Claim 11 (depends on 10)

The hand push lawn mower of claim 10, wherein a position where the grass baffle is connected to the body and a position of a center of the walking wheels is infinitely close or even overlapped.

### Claim 12

A hand push lawn mower, comprising:
a body comprising a cutting blade, a deck, a motor coupled to drive the cutting blade to rotate, a walking assembly comprising walking wheels and a first drive shaft for driving the walking wheels to rotate, a height adjustment assembly coupled to the deck to selectively move the deck up and down, and a grass baffle to prevent grass clippings from splashing towards a back of the hand push lawn mower;
the height adjustment assembly comprises a second drive shaft which is rotatable relative to the first drive shaft for driving the deck to move, an adjustment handle for a user to operate, and a link mechanism connecting the adjustment handle and the second drive shaft, and the grass baffle is mounted to the second drive shaft.

### Claim 13 (depends on 12)

The hand push lawn mower of claim 12, wherein the second drive shaft is parallel to the first drive shaft.

### Claim 14 (depends on 13)

The hand push lawn mower of claim 13, wherein the height adjustment assembly further comprises a connecting piece that is rotatably connected to the walking wheels and the connecting piece forms a rotatable connection with the first drive shaft and a fixed connection with the second drive shaft.

### Claim 15 (depends on 14)

The hand push lawn mower of claim 14, wherein a ratio of a distance from the first drive shaft to a center of the walking wheels to a distance of the second drive shaft to the center of the walking wheels is about 1.52.

### Claim 16 (depends on 14)

The hand push lawn mower of claim 14, wherein a distance from the first drive shaft to a center of the walking wheels is greater than a distance of the second drive shaft to the center of the walking wheels.

### Claim 17 (depends on 12)

The hand push lawn mower of claim 12, wherein the second drive shaft is eccentrically arranged with respect to an axis of rotation of the walking wheels.