POWER TOOLS

• US 20150075830A1
• Filed: 12/28/2012
• Published: 03/19/2015
• Est. Priority Date: 12/28/2011
• Status: Active Grant

• Current Assignee: Positec Power Tools Company Limited (Positec Group Limited)
• Original Assignee: Positec Power Tools Company Limited (Positec Group Limited)
• Inventors: Zhang, Shisong, Pang, Xiaoli, Xu, Jingtao, Wu, Yu
• Granted Patent: US 9,821,430 B2
• Time in Patent Office: Days
• US Class Current: 173/213
• CPC Class Codes: B24B 23/022 Spindle-locking devices, e.g. for mounting or removing the tool
• CPC Class Codes: B24B 23/04 with oscillating grinding tools; Accessories therefor
• CPC Class Codes: B24B 45/006 Quick mount and release means for disc-like wheels, e.g. on power tools
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Abstract

The invention relates to a power tool with a quick-operated locking mechanism. The power tool comprises a housing, an output shaft configured to mount and drive a working head and provided with a carrier extending out of the housing, a fixer configured to fix the working head at the carrier of the output shaft, a locking mechanism configured to lock or release the fixer and a driving mechanism configured to move the locking mechanism between a locking position and a releasing position, while in the locking position, the fixer is clamped fixedly on the output shaft, and while in the releasing position, the fixer is released from the output shaft. The distance between the locking mechanism and the carrier of the output shaft keeps constant in the locking position to prevent slippage of the fixer and ensure the working head firmly fixed.

Claims

1. A power tool, comprising:

a housing;

an output shaft being configured to oscillate about an axis in a reciprocating way and used for mounting and driving a working head, the output shaft is provided with a carrier extending out of the housing;

a fixing element comprising a pressing portion for fixing the working head at the carrier of the output shaft;

a driving mechanism being configured to shift between a first mating position and a second mating position, when the driving mechanism is in the first mating position, the pressing portion of the fixing element presses the working head, when the driving mechanism is in the second mating position, the pressing portion of the fixing element releases the working head;

the driving mechanism comprises a driving unit and a mating unit, the driving unit and the mating unit are capable of moving relative to each other, the fixing element is configured to move axially by moving the driving unit and to be axially fixed by supporting of the driving unit or mating unit in the first mating position.

2. The power tool according to claim 1, wherein rotary movement of the driving unit relative to the mating unit makes the driving mechanism to move between the first mating position and the second mating position.

3. The power tool according to claim 2, wherein the driving unit is provided with a meshing portion and the mating unit is provided with a second meshing portion for mating with the first meshing portion, one of the first meshing portion and the second meshing portion is provided with a first meshing surface for mating.

4. The power tool according to claim 3, wherein the first meshing surface is a cam surface.

5. The power tool according to claim 3, wherein the first meshing surface is a plane and the angle between the plane and the axis of the output shaft is an acute angle.

6. The power tool according to claim 3, wherein the other one of the first meshing portion and the second meshing portion is provided with a second meshing surface for mating with the first meshing surface.

7. The power tool according to claim 2, wherein the driving unit is rotatable around the axis of the output shaft or a line parallel to the axis of the output shaft.

8. The power tool according to claim 2, wherein the driving unit is rotatable around a line perpendicular to the axis of the output shaft.

9. The power tool according to claim 1, wherein a selflocking is formed between the driving unit and the mating unit when the driving mechanism is in the second mating position.

10. The power tool according to claim 1, wherein the moving distance of the driving unit is greater than axial moving distance of the fixing element during the process of the driving mechanism moving from the second mating position to the first mating position.

11. The power tool according to claim 1, wherein the fixing element is rigidly supported by the driving mechanism, and the axial distance between the pressing portion of the fixing element and the carrier of the output shaft keeps constant when the driving mechanism is in the second mating position.

12. The power tool according to claim 1, wherein the fixing element further comprises a rod portion axially extending from the pressing portion into the output shaft, the rod portion is suitable with the driving unit or the mating unit.

13. The power tool according to claim 1, wherein the driving mechanism further comprises a first elastic unit, when the fixing element is pressed to move axially, the driving mechanism automatically returns from the second mating position to the first mating position by the first elastic unit.

14. The power tool according to claim 1, wherein further comprising an operation mechanism being configured to move the driving mechanism between the first mating position and the second mating position.

15. The power tool according to claim 1, wherein the driving unit comprises a first stop, the mating unit comprises a second stop, when the driving mechanism is in the second mating position, the first stop is mating with the second stop for limiting the rotation of the driving unit.