Power tool

Patent metadata

Field	Value
Publication number	US-12544900-B2
Application number	US-202418968632-A
Country	US
Kind code	B2
Filing date	Dec 4, 2024
Priority date	Jun 29, 2022
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A power tool includes a locking mechanism for locking the output shaft when the output shaft transmits torque to the motor shaft. The locking mechanism includes a shaft lock bracket connected to the output shaft to drive the output shaft; and a damping assembly including a first mounting portion connected to the output shaft, a second mounting portion connected to the shaft lock bracket, and a buffer part. The buffer part connects the first mounting portion to the second mounting portion. When the output shaft and the shaft lock bracket move relative to each other, the buffer part undergoes the torsional deformation to provide a buffer force that delays the movement of the output shaft relative to the shaft lock bracket.

First claim

What is claimed is:

1 . A power tool, comprising:
a housing; a motor accommodated in the housing and comprising a drive shaft rotating about a first axis; an output shaft for outputting torque and rotating about a second axis; and a locking mechanism for locking the output shaft when the output shaft is subjected to a force and transmits torque to the drive shaft, wherein the locking mechanism comprises:
a shaft lock bracket connected to the output shaft to drive the output shaft; and
a damping assembly comprising a first mounting portion connected to the output shaft, a second mounting portion connected to the shaft lock bracket, and a buffer part connecting the first mounting portion to the second mounting portion,
wherein, when the output shaft and the shaft lock bracket move relative to each other, the buffer part undergoes torsional deformation to provide a buffer force that delays movement of the output shaft relative to the shaft lock bracket, and wherein a rear end surface of the output shaft is provided with a first mounting groove, and the first mounting portion is inserted into the first mounting groove.

2 . The power tool of claim 1 , wherein the output shaft has a first outer circumferential surface, the shaft lock bracket comprises a first inner surface circumferentially surrounding the first outer circumferential surface, a first gap is provided between the first inner surface and the first outer circumferential surface, and the damping assembly is disposed outside the first gap.

3 . The power tool of claim 1 , wherein the buffer part at least partially extends along a direction of the second axis.

4 . The power tool of claim 1 , wherein the first mounting portion, the second mounting portion, and the buffer part are an integral component.

5 . The power tool of claim 1 , wherein the locking mechanism further comprises a shaft lock ring disposed around the output shaft and locking members disposed between the shaft lock ring and the output shaft, and the locking members are placeable into at least a locking position and an unlocking position relative to the shaft lock ring.

6 . The power tool of claim 5 , wherein the shaft lock ring is disposed in the housing, and the shaft lock ring and the housing are not rotatable relative to each other.

7 . The power tool of claim 5 , wherein, when the output shaft transmits torque to the drive shaft, the locking members are located at the locking position, and the locking members lock rotation of the output shaft relative to the housing; and, when the drive shaft transmits torque to the output shaft, the locking members are located at the unlocking position, and the locking members release the rotation of the output shaft relative to the housing.

8 . The power tool of claim 5 , wherein the shaft lock bracket is further connected to or formed with switching blocks inserted between the shaft lock ring and the locking members, and the switching blocks are used for switching the locking members between the locking position and the unlocking position.

9 . The power tool of claim 2 , wherein the shaft lock bracket rotates relative to the output shaft within a preset angle range.

10 . The power tool of claim 1 , wherein the first mounting portion rotates synchronously with the output shaft.

11 . The power tool of claim 1 , wherein the second mounting portion rotates synchronously with the shaft lock bracket.

12 . The power tool of claim 1 , wherein the buffer part comprises a first buffer part extending along the second axis and connected to the first mounting portion and a second buffer part extending along a direction perpendicular to the second axis and connected to the second mounting portion.

13 . The power tool of claim 12 , wherein the first buffer part and the second buffer part are fixedly connected or integrally formed.

14 . The power tool of claim 1 , wherein the first mounting portion and the second mounting portion are arranged front and back along a direction of the second axis.

15 . The power tool of claim 1 , further comprising a battery pack, wherein the battery pack supplies power to the motor.

16 . A power tool, comprising:
a housing; a motor accommodated in the housing and comprising a drive shaft rotating about a first axis; an output shaft for outputting torque and rotating about a second axis, wherein the output shaft has a first outer circumferential surface; and a locking mechanism for locking the output shaft when the output shaft is subjected to a force and transmits torque to the drive shaft, wherein the locking mechanism connects the motor to the output shaft; wherein the locking mechanism comprises:
a shaft lock bracket comprising a first inner surface at least surrounding part of the first outer circumferential surface, wherein a first gap is provided between the first inner surface and the first outer circumferential surface; and
a damping assembly comprising a buffer part,
wherein when the output shaft and the shaft lock bracket move relative to each other, the buffer part undergoes torsional deformation to provide a buffer force that delays movement of the output shaft relative to the shaft lock bracket, and wherein the shaft lock bracket is provided with a drive hole and a mounting groove arranged in sequence from front to rear along the second axis, the drive hole is configured to drive the output shaft to rotate and provide with the first inner surface, an aperture of the mounting groove is larger than that of the drive hole, the damping assembly comprises a first mounting portion connected to the output shaft and a second mounting portion arranged in the mounting groove, and the buffer part connects the first mounting portion to the second mounting portion.

17 . The power tool of claim 16 , wherein the locking mechanism further comprises a shaft lock ring disposed around the output shaft and locking members disposed between the shaft lock ring and the output shaft, and the locking members are placeable into at least a locking position and an unlocking position relative to the shaft lock ring.

18 . The power tool of claim 16 , wherein the shaft lock bracket rotates relative to the output shaft within a preset angle range.

19 . A power tool, comprising:
a housing; a motor accommodated in the housing and comprising a drive shaft rotating about a first axis; an output shaft for outputting torque and rotating about a second axis; and a locking mechanism for locking the output shaft when the output shaft is subjected to a force and transmits torque to the drive shaft, wherein the locking mechanism comprises: a shaft lock bracket connected to the output shaft to drive the output shaft; and a damping assembly comprising a first mounting portion connected to the output shaft, a second mounting portion connected to the shaft lock bracket, and a buffer part connecting the first mounting portion to the second mounting portion, wherein, when the output shaft and the shaft lock bracket move relative to each other, the buffer part undergoes torsional deformation to provide a buffer force that delays movement of the output shaft relative to the shaft lock bracket; wherein the second mounting portion is a ring-shaped member, and the ring-shaped member is disposed in the shaft lock bracket.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Pei Qingqing
• Tong Shubin
• Cheng Yonghui

Classifications

• B23B45/02 Primary

  driven by electric power · CPC title

• B25F5/006

  Vibration damping means · CPC title

• B25F5/001

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B23B45/008

  Gear boxes, clutches, bearings, feeding mechanisms or like equipment · CPC title

• B25B21/02

  with means for imparting impact to screwdriver blade or nut socket · CPC title