Clamping fixture for detachably fastening a disk-shaped tool

• US 7,438,634 B2
• Filed: 01/12/2007
• Issued: 10/21/2008
• Est. Priority Date: 01/16/2006
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Habele, Michael
• Primary Examiner(s): NGUYEN, DUNG V
• Application Number:
  US11/622,599
• Publication Number:
  US 20070167120A1
• Time in Patent Office: 648 Days
• Field of Search: 451/352, 451/353, 451/358, 451/359, 451/344
• US Class Current: 451/359
• CPC Class Codes: B24B 45/006 Quick mount and release means for disc-like wheels, e.g. on power tools
• CPC Class Codes: B27B 5/32 Devices for securing circular saw blades to the saw spindle

Abstract

A clamping fixture for detachably fastening a disk-shaped tool on a rotatably driven working spindle with a driven gear includes a fastening element a supporting flange arranged so that the tool is accommodated between the fastening element and the supporting flange and rotatably displaceable relative to the working spindle in the tightening direction and axially in a direction toward the tool. The supporting flange is displaceable relative to the working spindle in a release direction and axially away from the tool when the fastening element is released, and is lockable with the working spindle or a component which is non-rotatably connected with the working spindle in a position which is displaced axially in a direction of the tool, and the supporting flange cannot be displaced axially away from the tool until a lock is released.

Claims

1. A clamping fixture for detachably fastening a disk-shaped tool on a rotatably driven working spindle with a driven gear which is non-rotatably connected with said working spindle, the clamping fixture comprising a fastening element;

a supporting flange arranged so that the tool is accommodated between said fastening element and said supporting flange, said supporting flange being rotatably displaceable relative to the working spindle in the tightening direction and axially in a direction toward the tool, said supporting flange being rotatably displaceable relative to said working spindle in a release direction and axially away from the tool when said fastening element is released, said supporting flange being lockable with the driven gear in a position which is displaced axially in a direction of the tool, wherein said supporting flange cannot be displaced axially away from the tool until a lock is released, further comprising a locking mechanism, wherein said locking mechanism is configured to automatically lock said supporting flange when a specified axial position is reached, and wherein said locking mechanism includes at least one locating bolt which is spring-loaded in a direction of the driven gear and which, in a locking position, engages in an opening of the driven gear.

2. A clamping fixture as defined in claim 1, wherein the driven gear is provided with a driving element to transmit torque to said supporting flange given a specified relative position between said supporting flange and said working spindle.

3. A clamping fixture as defined in claim 2, wherein said driving element is configured to transmit torque to said supporting flange given a specified relative position between said supporting flange and said working spindle, when an axial deflection of said supporting flange is at a maximum.

4. A clamping fixture as defined claim 1, wherein said locking mechanism automatically locks said supporting flange when a maximum axial deflection of said supporting flange is reached.

5. A clamping fixture as defined in claim 1, wherein said locking mechanism is configured to automatically lock said supporting flange and is configured as a tooth system on an end face between said supporting flange and a driven gear.

6. A clamping fixture as defined in claim 1, wherein said locking mechanism is configured to automatically lock said supporting flange, and further comprising a spindle locking device configured to release said locking mechanism when being actuated.

7. A clamping fixture as defined in claim 1;

and further comprising two axial bevels via which said supporting flange and a driven gear bear against each other.

8. A clamping fixture as defined in claim 7, wherein said two bevels have a lead angle which is greater than a friction angle between said supporting flange and said driven gear.

9. A clamping fixture as defined in claim 7, wherein said bevels have a left-hand slope, while said working spindle has a working spindle thread with a right-hand thread to fix said fastening element in place, said working spindle being driven in a clockwise direction as viewed in a driven direction.