Lawn mower

Patent metadata

Field	Value
Publication number	US-11570949-B2
Application number	US-201916684778-A
Country	US
Kind code	B2
Filing date	Nov 15, 2019
Priority date	Nov 16, 2018
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

A lawn mower, wherein the cutter system of the lawn mower needs to judge whether the start pulse and the start signal of the cutter switch are valid at the same time under the condition that the seat switch is closed, and the cutter system will be started, only the two conditions are met at the same time, thus not only improving the safety when the cutter system is started, but also the startup of the cutter system can be completed automatically, saving time and labor, and reducing the operator's operation difficulty.

First claim

We claim:

1. A lawn mower, comprising:
a battery configured to provide power to said lawn mower;
a walking system, comprising a walking wheel and a motor for driving the walking wheel;
a cutter system, comprising:
at least one blade,
at least one drive motor for driving said blade to rotate,
a contactor for activating said cutter system,
a seat switch, and
a cutter switch; and

a control system configured to open and close the contactor;
wherein said cutter system starts to work when the seat switch is switched on the contactor is closed and the cutter switch is switched on,
the control system opens said contactor and said cutter system is powered off when said seat switch is switched off, and
the control system closes said contactor and said cutter system is powered back on when said seat switch is switched back on.

2. The lawn mower according to claim 1 , wherein said cutter system further comprises a high-low speed cutter switch for controlling a rotational speed of said blade, when the cutter system starts to work, the at least one blade rotates at a high speed if the high-low speed cutter switch is active and the at least one blade rotates at a low speed if the high-low speed cutter switch is inactive.

3. The lawn mower according to claim 1 , wherein a start pulse of said cutter switch comprises a rising edge and a falling edge, and a start signal of the cutter switch comprises a low-level input and a high-level input.

4. The lawn mower according to claim 3 , wherein the cutter system is activated if the valid start pulse of the cutter switch is a falling edge when the valid start signal of the cutter switch is a low-level input.

5. The lawn mower according to claim 3 , wherein if the start signal of the cutter switch is valid when using a high-level input, and the start pulse of the cutter switch is valid when it is a rising edge, the cutter system is activated.

6. The lawn mower according to claim 3 , wherein a pulse clock signal CLK transitions from 0 to 1 when the start pulse of the cutter switch is a rising edge; the pulse clock signal CLK transitions from 1 to 0 when the start pulse of the cutter switch is a falling edge.

7. The lawn mower according to claim 6 , wherein the pulse clock signal CLK is 1 when the start signal of the cutter switch is a high-level input; the pulse clock signal CLK is 0 when the start signal of the cutter switch is a low-level input.

Assignees

• Globe Jiangsu Co Ltd

Inventors

• Chen Hui
• Xue Jiafu
• Zhao Peng
• Ding Zhizheng
• Wang Jing
• Liu Zhaochong
• Huang Kai

Classifications

• A01D34/006 Primary

  Control or measuring arrangements · CPC title

• A01D34/828

  Safety devices · CPC title

• G05B9/03

  with multiple-channel loop, i.e. redundant control systems · CPC title

• A01D34/78 Primary

  electric · CPC title

• A01D75/20

  Devices for protecting men or animals · CPC title