Power tool

Patent metadata

Field	Value
Publication number	US-11919136-B2
Application number	US-202117381723-A
Country	US
Kind code	B2
Filing date	Jul 21, 2021
Priority date	Jul 28, 2020
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A power tool includes a casing, an output mechanism, a motor, a leadscrew, a rotation assembly, a radial transmission assembly, an axial transmission assembly, and a torque transmission portion. The leadscrew extends along a front-and-back direction and is connected to the output mechanism. The rotation assembly is connected to the motor and is driven by the motor to rotate around the leadscrew. The radial transmission assembly is driven by the rotation assembly to rotate. The axial transmission assembly is separately connected to the radial transmission assembly and the leadscrew in a rotation manner and is configured to drive the leadscrew to move along an axial direction of the leadscrew. The torque transmission portion is disposed between the radial transmission assembly and the axial transmission assembly and is configured to transmit torque and cause the axial transmission assembly and the radial transmission assembly to rotate synchronously.

First claim

What is claimed is:

1. A power tool, comprising:
a casing;
an output mechanism disposed at a front end of the casing;
a motor configured to provide power for the output mechanism;
a leadscrew extending along a front-and-back direction and connected to the output mechanism;
a rotation assembly connected to the motor and driven by the motor to rotate around the leadscrew;
a radial transmission assembly driven by the rotation assembly to rotate;
an axial transmission assembly separately connected to the radial transmission assembly and the leadscrew in a rotation manner and configured to drive the leadscrew to move along an axial direction of the leadscrew; and
a torque transmission portion disposed between the radial transmission assembly and the axial transmission assembly and configured to transmit torque and cause the axial transmission assembly and the radial transmission assembly to rotate synchronously,
wherein the radial transmission assembly comprises a first transmission sleeve and transmission teeth connected to the rotation assembly, the radial transmission assembly is disposed on a radially outer side of the first transmission sleeve, and the torque transmission portion comprises a first torque transmission portion disposed between the first transmission sleeve and the axial transmission assembly and configured to cause the first transmission sleeve and the axial transmission assembly to rotate synchronously, wherein the first torque transmission portion comprises several first non-circular portions disposed on an inner circumference of the first transmission sleeve and several second non-circular portions disposed on an outer circumference of the axial transmission assembly and the several second non-circular portions fit with the several first non-circular portions,
wherein the axial transmission assembly comprises a ball rack and balls, the ball rack is connected to the first transmission sleeve in the transmission manner and sleeved on an outer circumference of the leadscrew, and a rack wall of the ball rack is provided with through holes through which the balls are allowed to pass, and
wherein the radial transmission assembly further comprises a second transmission sleeve, the second transmission sleeve is sleeved on an outer circumference of the ball rack and provided with retention grooves on an inner circumferential wall of the second transmission sleeve, and the balls are allowed to enter the retention grooves.

2. The power tool of claim 1 , wherein the torque transmission portion further comprises a second torque transmission portion disposed between the second transmission sleeve and the axial transmission assembly and configured to cause the second transmission sleeve and the axial transmission assembly to rotate synchronously.

3. The power tool of claim 2 , wherein the second torque transmission portion comprises an anti-rotation pin, an installation hole disposed on the second transmission sleeve, and a pin groove disposed on the ball rack, and the pin groove extends along an axial direction of the ball rack.

4. The power tool of claim 1 , wherein the second transmission sleeve is further provided with third non-circular portions on an outer circumference of the second transmission and the third non-circular portions fit with the several first non-circular portions so that rotation of the second transmission sleeve relative to the first transmission sleeve is limited.

5. The power tool of claim 4 , wherein each of the several first non-circular portions is a first plane disposed on the inner circumference of the first transmission sleeve, each of the several second non-circular portions is a second plane disposed on the outer circumference of the ball rack, and each of the third non-circular portions is a third plane disposed on the outer circumference of the second transmission sleeve.

6. The power tool of claim 1 , wherein the rotation assembly comprises a driving gear and a sleeve, the driving gear is disposed coaxially with the sleeve, the driving gear is connected to the motor in the transmission manner, and the sleeve is provided with transmission holes into which the transmission teeth are inserted.

7. The power tool of claim 1 , further comprising a clutch mechanism wherein the clutch mechanism is configured to drive the axial transmission assembly to move to a clutch position, and, in a case where the axial transmission assembly is located at the clutch position, the balls are disengaged from the leadscrew.

8. The power tool of claim 7 , wherein the clutch mechanism comprises a movement assembly and a connection assembly, the connection assembly is connected to the ball rack, the movement assembly is sleeved on the second transmission sleeve, and the movement assembly is configured to drive the connection assembly to drive the ball rack to move axially.

9. The power tool of claim 8 , wherein the clutch mechanism further comprises a trigger assembly and the trigger assembly is configured to drive the movement assembly to move to the clutch position.

10. The power tool of claim 9 , wherein the trigger assembly is a shift lever or a shift fork, the shift lever or the shift fork is pivotally connected to the casing, and the connection assembly is an insertion piece that is clamped at an axial end of the ball rack.

11. A power tool, comprising:
a casing;
an output mechanism disposed at a front end of the casing;
a motor configured to provide power for the output mechanism;
a leadscrew extending along a front-and-back direction and connected to the output mechanism;
a rotation assembly connected to the motor and driven by the motor to rotate around the leadscrew;
a radial transmission assembly driven by the rotation assembly to rotate;
an axial transmission assembly separately connected to the radial transmission assembly and the leadscrew in a rotation manner and configured to drive the leadscrew to move along an axial direction of the leadscrew; and
a torque transmission portion disposed between the radial transmission assembly and the axial transmission assembly and configured to transmit torque and cause the axial transmission assembly and the radial transmission assembly to rotate synchronously,
wherein the output mechanism is a glue cylinder and the power tool is a glue gun, and further comprising an operation handle disposed at a back end of the leadscrew.

12. A power tool, comprising:
a casing;
an output mechanism disposed at a front end of the casing;
a motor configured to provide power for the output mechanism;
a leadscrew extending along a front-and-back direction and connected to the output mechanism;
a rotation assembly connected to the motor and driven by the motor to rotate around the leadscrew;
a radial transmission assembly driven by the rotation assembly to rotate;
an axial transmission assembly separately connected to the radial transmission assembly and the leadscrew in a rotation manner and configured to drive the leadscrew to move along an axial direction of the leadscrew; and
a torque transmission portion disposed between the radial transmission assembly and the axial transmission assembly and configured to transmit torque and cause the axial transmission assembly and the radial transmission assembly to rotate synchronously,
wherein the output mechanism comprises a container and a piston movable in the container, the power tool further comprises an anti-failure mechanism detachably connected to the piston, the anti-failure mechanism comprises a cleaning tooth, and, in a case where the anti-failure mechanism moves relative to the leadscrew, the cleaning tooth removes a residual adhesive on the leadscrew.

Assignees

• Nanjing Chervon Ind Co Ltd
• Nanjing Chevron Ind Co Ltd

Inventors

• Zheng Chengyu
• Wang Xiaoyong
• Jin Dinghao

Classifications

• B25F5/001 Primary

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

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title