Granted Patent B2

US 12,520,754 · App. 17/941,652 · Granted Jan 13, 2026

Inventors: Toshinari Yamaoka (Nanjing, CN); Fangjie Nie (Nanjing, CN); Haishen Xu (Nanjing, CN); Xiandian Shao (Nanjing, CN)

Assignee: Chervon (HK) Limited

A01D34/824A01D34/67A01D34/6806A01D34/828A01D69/02A01D69/10A01D2034/6843A01D2101/00

Abstract

Claims (35)

1 . A power tool, comprising:

a main body;

a working member coupled to the main body;

a motor coupled to the main body, the motor operable to move the working member;

a handle for guiding the power tool during operation, the handle comprising:

a first member coupled to the main body;

a second member movably coupled to the first member between a retracted position and an extended position; and

a locking mechanism coupled between the first member and the second member, the locking mechanism movable between a locked position, in which the second member is fixed relative to the first member, and an unlocked position, in which the second member is movable relative to the first member; and

a control assembly configured to allow operation of the power tool in response to the locking mechanism being moved into the locked position,

wherein the control assembly includes a safety switch, wherein the locking mechanism is operable to lock the second member relative to the first member when the locking mechanism is in the locked position and is operable to allow the second member to move relative to the first member when the locking mechanism is in the unlocked position,

wherein the control assembly is configured to disable operation of the power tool when the safety switch detects the unlocked position of the locking mechanism and wherein the control assembly is configured to allow operation of the power tool when the safety switch detects the locked position of the locking mechanism, and

wherein the safety switch is coupled to the first member such that the safety switch is movable relative to the second member when the first and second members move between the retracted and extended positions.

2 . The power tool of claim 1 , wherein the control assembly is configured to allow operation of the power tool when the safety switch detects that the first and second members are in the extended position, and wherein the control assembly is configured to disable operation of the power tool when the first and second members are in the retracted position.

3 . The power tool of claim 1 , wherein the power tool is a lawn mower.

4 . The power tool of claim 1 , wherein the working member is a cutting blade.

5 . A handle configured to be coupled to a power tool to guide the power tool during operation, the handle comprising:

a first member configured to be coupled to a main body of the power tool;

a second member movably coupled to the first member between a retracted position and an extended position;

a locking mechanism coupled between the first member and the second member, the locking mechanism movable between a locked position, in which the second member is fixed relative to the first member, and an unlocked position, in which the second member is movable relative to the first member; and

a control assembly configured to allow operation of the power tool in response to the second member being in the extended position,

wherein the control assembly comprises a safety switch in communication with the second member, wherein the locking mechanism is operable to lock the second member relative to the first member when the locking mechanism is in the locked position, and wherein the locking mechanism is operable to allow the second member to move relative to the first member when the locking mechanism is in the unlocked position,

wherein the control assembly is configured to disable operation of the power tool when the safety switch detects the second member is not in the extended position and wherein the control assembly is configured to allow operation of the power tool when the safety switch detects the second member is in the extended position, and

wherein the safety switch is coupled between the first member and the second member such that the safety switch is actuated when the first and second members move between the retracted and extended positions.

6 . The handle of claim 5 , wherein the safety switch is a contact switch.

7 . The handle of claim 6 , wherein the control assembly is configured to allow operation of the power tool when the safety switch detects that the first and second members are in the extended position, and wherein the control assembly is configured to disable operation of the power tool when the first and second members are in the retracted position.

8 . A handle configured to be coupled to a mower to guide the mower during operation, the handle comprising:

a first member configured to be coupled to a main body of the mower;

a second member movably coupled to the first member between a retracted position and an extended position;

a locking mechanism coupled between the first member and the second member, the locking mechanism movable between a locked position, in which the second member is fixed relative to the first member, and an unlocked position, in which the second member is movable relative to the first member; and

a control assembly comprising a control processor configured to:

detect when the handle is not in the extended position;

disable operation of the mower when the handle is not in the extended position;

detect when the handle is in the extended position; and

allow operation of the mower when the handle is in the extended position.

9 . The handle of claim 8 , wherein the control assembly includes a safety switch in communication with at least one of the first member, the second member, or the locking mechanism and wherein the safety switch is coupled to the first member such that the safety switch is movable relative to the second member when the first and second members move between the retracted position and the extended position.

Assignments (1)

Priority Claims (4)

Continuity (10)

References Cited (400)