POWER TOOL

• US 20120292864A1
• Filed: 05/15/2012
• Published: 11/22/2012
• Est. Priority Date: 05/18/2011
• Status: Active Grant

• Current Assignee: Chervon (HK) Limited (Chervon Holdings Limited)
• Original Assignee: Chervon (HK) Limited (Chervon Holdings Limited)
• Inventors: Zhou, Hongtao
• Granted Patent: US 9,174,354 B2
• Time in Patent Office: Days
• US Class Current: 279/141
• CPC Class Codes: B23B 31/10 characterised by the retaining or gripping devices or their immediate operating means
• CPC Class Codes: B23Q 3/12 for securing to a spindle in general B23Q3/152 takes precedence; chucks B23B31/02
• CPC Class Codes: B24B 23/04 with oscillating grinding tools; Accessories therefor
• CPC Class Codes: B24B 27/08 being portable
• 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
• CPC Class Codes: B27B 19/006 with oscillating saw blades; Hand saws with oscillating saw blades
• CPC Class Codes: B27B 5/32 Devices for securing circular saw blades to the saw spindle
• CPC Class Codes: Y10T 279/33 Member applies axial force component
• CPC Class Codes: Y10T 279/3451 Nonseparable or built-in

Abstract

A power tool has a driving shaft for driving a working element and a clamping device for clamping the working element. The clamping device has a clamping position in which the working element may be fixed relative to the driving shaft and a release position in which the working element can be removed from the driving shaft. An operating member is coupled to the clamping device for moving the clamping device between positions. The clamping device also has a rotating position in which the working element can be rotated by an angle relative to the driving shaft and the operating member has an operating position that corresponds to the rotating position.

Claims

1. A power tool, comprising:

a driving shaft for driving a working element;

a clamping device for clamping the working element, the clamping device having a clamping position where the working element is fixed relative to the driving shaft and a release position where the working element is removable from the driving shaft; and

an operating member coupled to the clamping device and being manually moveable to cause the clamping device to move between the clamping position and the release position;

wherein the clamping device further has a rotating position in which the working element is free to be angularly rotated relative to the driving shaft and wherein the operating member is moveable to an operating position corresponding to the rotating position.

2. The power tool according to claim 1, wherein the working element is driven in an oscillating manner about a longitudinal axis of the driving shaft.

3. The power tool according to claim 1, wherein the driving shaft comprises a hollow spindle and the clamping device comprises a fastening element having a clamping shaft insertable into the spindle and a locking assembly for locking the clamping shaft in the spindle.

4. The power tool according to claim 3, wherein, in the clamping position, the fastening element is locked by the locking assembly and located in a first locking position, in the rotating position, the fastening element is locked by the locking assembly and located in a second locking position and, in the release position, the fastening element is releasable from the locking assembly.

5. The power tool according to claim 4, wherein the locking assembly comprises a locking member, an intermediate member, and a moving member wherein the intermediate member is between the locking member and the moving member, the moving member has a concave portion and a straight portion, and the intermediate member is selectively abutted against the concave portion or the straight portion of the moving member.

6. The power tool according to claim 5, wherein the locking member is connected to the clamping shaft of the fastening element by a form-fit structure in the first and second locking positions.

7. The power tool according to claim 6, wherein the form-fit structure comprises one of annular grooves and teeth on the clamping shaft and the locking member.

8. The power tool according to any claim 3, wherein the driving shaft is connected with a flange member movable along the axial direction of the driving shaft, the flange member having a first end adapted for mating with the driving shaft and a second end for clamping the working element to the fastening element.

9. The power tool according to claim 8, wherein the first end of the flange member is unrotatably connected to the driving shaft in the clamping position and is disengageable from an end of the driving shaft in the rotating position.