Power tool with tool bit holder operator

• US 7,293,944 B2
• Filed: 06/29/2005
• Issued: 11/13/2007
• Est. Priority Date: 07/20/2004
• Status: Expired due to Fees

• Current Assignee: Choon Nang Electrical Appliance MFY., Ltd.
• Original Assignee: Choon Nang Electrical Appliance MFY., Ltd.
• Inventors: Lui, Tat Nin
• Primary Examiner(s): CADUGAN, ERICA E
• Application Number:
  US11/168,482
• Publication Number:
  US 20060018727A1
• Time in Patent Office: 867 Days
• Field of Search: 409/182, 409/181, 409/175, 409/232, 409/234, 408/240, 279/42, 279/48, 279/56, 279/147, 279149-150, 144/154.5, 144/136.95
• US Class Current: 409/182
• CPC Class Codes: B23B 2231/2081 Keys, spanners or wrenches to operate the collet chuck
• CPC Class Codes: B23B 2260/078 Hand tools used to operate chucks or to assemble, adjust or disassemble tools or equipment used for turning, boring or drilling
• CPC Class Codes: B23B 31/06 Features relating to the removal of tools; Accessories therefor
• CPC Class Codes: B23B 31/2012 Threaded cam actuator
• CPC Class Codes: Y10T 279/17299 Threaded cam sleeve
• CPC Class Codes: Y10T 279/3431 Chuck key
• CPC Class Codes: Y10T 279/3451 Nonseparable or built-in
• CPC Class Codes: Y10T 409/306608 End mill [e.g., router, etc.]
• CPC Class Codes: Y10T 409/309408 with cutter holder

Abstract

A power tool having a body, a tool bit holder protruding from the tool body for holding and rotating a tool bit about an axis of rotation, and an operator for operating the bit holder. The operator includes an annular member rotationally engageable with the bit holder for manual turning to tighten and/or release the bit holder, and a mount mounting the annular member to the tool body for movement between a non-operative position, rotationally disengaged from the bit holder, and an operative position, rotationally engaged with the bit holder.

Claims

1. A power tool having:

a tool body having a circular element;

a tool bit holder protruding from the tool body for holding and rotating a tool bit about an axis of rotation; and

an operator for operating the bit holder, the operator comprising;

an annular member, rotationally engageable with the bit holder, for manual turning of the bit holder to tighten a tool bit in and loosen a tool bit from the bit holder, and

a mount mounting the annular member to the tool body for movement of the annular member between a non-operative position rotationally disengaging from the tool bit holder and an operative position rotationally engaging the tool bit holder, wherein

the mount has a plurality of legs extending through the annular member that rotatably engage the circular element through a snap action, and

the annular member is slidable along the mount between the non-operative position and the operative position.

2. The power tool as claimed in claim 1, wherein the operator includes resilient means resiliently biasing the annular member towards the non-operative position.

3. The power tool as claimed in claim 2, wherein the resilient means is located within the mount and resiliently biases the annular member with respect to the mount.

4. The power tool as claimed in claim 1, wherein the mount mounts the annular member to the tool body at a position surrounding the bit holder for movement in opposite directions along the axis of rotation, between the non-operative position and the operative position.

5. The power tool as claimed in claim 1, wherein the annular member has an aperture having a non-circular shape, complementary to the shape of the bit holder, for engagement and rotation of the bit holder.

6. The power tool as claimed in claim 1, including a rigid component mounted on the annular member for engagement and rotation of the bit holder.

7. The power tool as claimed in claim 6, wherein the rigid component is a molded insert of and is located partially within the annular member.

8. The power tool as claimed in claim 6, wherein the rigid component has at least one arm fixed to the annular member.

9. The power tool as claimed in claim 1, wherein the mount is rotatably engaged with the circular element for manual turning of the annular member.

10. The power tool as claimed in claim 1, wherein the tool bit holder comprises a collet.

11. A power tool having:

a tool body;

a tool bit holder protruding from the tool body for holding and rotating a tool bit about an axis of rotation; and

an operator for operating the bit holder, the operator comprising;

an annular member,

a rigid component having a non-circular central aperture for engagement and manual rotation of the bit holder to tighten a tool bit in and loosen a tool bit from the tool bit holder, the rigid component including at least one outwardly extending arm engaging the annular member, and

a mount mounting the annular member to the tool body for movement of the annular member between a non-operative position rotationally disengaged from the tool bit holder and an operative position with the rigid component rotationally engaging the bit holder.

12. The power tool as claimed in claim 11, wherein the operator includes resilient means resiliently biasing the annular member towards the non-operative position.

13. The power tool as claimed in claim 12, wherein the resilient means is located within the mount and resiliently biases the annular member with respect to the mount.

14. The power tool as claimed in claim 11, wherein the mount mounts the annular member to the tool body at a position surrounding the bit holder for movement in opposite directions along the axis of rotation, between the non-operative position and the operative position.

15. The power tool as claimed in claim 11, wherein the annular member has an aperture having a non-circular shape, complementary to the shape of the bit holder, for engagement and rotation of the bit holder.

16. The power tool as claimed in claim 11, wherein the rigid component is a molded insert of and is located partially within the annular member.

17. The power tool as claimed in claim 11, wherein the mount extends through the annular member and is connected to the tool body so that the annular member is slidable along the mount between the non-operative position and the operative position.

18. The power tool as claimed in claim 17, wherein the tool body includes a circular element, and the mount has a plurality of legs that extend through the annular member and rotatably engage the circular element through a snap action.

19. The power tool as claimed in claim 11, wherein the tool body has a circular element, and the mount rotatably engages the circular element for manual turning of the annular member.

20. The power tool as claimed in claim 13, wherein the tool bit holder comprises a collet.