TOOL ATTACHMENT FOR A HAND-HELD MACHINE TOOL

• US 20140131959A1
• Filed: 11/08/2013
• Published: 05/15/2014
• Est. Priority Date: 11/15/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: TUSSING, Torsten
• Granted Patent: US 9,579,782 B2
• Time in Patent Office: Days
• US Class Current: 279/143
• CPC Class Codes: B23B 31/0261 for centering the tool
• CPC Class Codes: B23B 45/003 Attachments
• CPC Class Codes: B25F 3/00 Associations of tools for different working operations with one portable power-drive means; Adapters therefor
• CPC Class Codes: Y10T 279/34 Accessory or component
• CPC Class Codes: Y10T 279/3406 Adapter

Abstract

A tool attachment has: (i) a drive shaft driven rotationally; (ii) a locking section for locking on a mounting interface of a hand-held machine tool, the machine tool including a tool holder having a receiving member for receiving an insert tool and a first locking sleeve preloaded by a first spring element in an axial direction pointing away from the hand-held machine tool; and (iii) an actuating element configured to shift, upon mounting the tool attachment on the hand-held machine tool, the first locking sleeve against a spring force applied by the first spring element, in the direction of the hand-held machine tool.

Claims

1. A tool attachment, comprising:

a drive shaft configured to be driven rotationally;

a locking section for locking on a mounting interface of a hand-held machine tool, the machine tool including a tool holder having a receiving member for receiving an insert tool and a first locking sleeve preloaded by a first spring element in an axial direction pointing away from the hand-held machine tool; and

an actuating element configured to shift, upon mounting the tool attachment on the hand-held machine tool, the first locking sleeve against a spring force applied by the first spring element, in the direction of the hand-held machine tool.

2. The tool attachment as recited in claim 1, wherein the actuating element surrounds the drive shaft at least sectionally in sleeve-shaped fashion.

3. The tool attachment as recited in claim 2, wherein the drive shaft and the actuating element are formed in one piece.

4. The tool attachment as recited in claim 2, wherein:

the drive shaft is rotationally mounted in a base member forming an inner hollow space;

the base member has an outer circumference at which a second locking sleeve is disposed;

the second locking sleeve is axially displaceable against a spring force of a second spring element in order to release at least one locking element;

the second locking sleeve is preloaded by the second spring element in an axial direction which (i) points away from the tool attachment, and (ii) upon mounting the tool attachment on the hand-held machine tool, points in the direction of the hand-held machine tool.

5. The tool attachment as recited in claim 4, wherein upon mounting the tool attachment on the hand-held machine tool, the spring forces of the first and second spring elements act in mutually opposite directions.

6. The tool attachment as recited in claim 4, wherein the at least one locking element has at least one locking sphere engaging at least sectionally in an assigned radial opening in the base member.

7. The tool attachment as recited in claim 4, wherein the actuating element is configured to enable spring loading of the tool attachment by the first spring element via the first locking sleeve in the mounted state of the tool attachment on the hand-held machine tool, in the axial direction pointing away from the hand-held machine tool.

8. The tool attachment as recited in claim 4, wherein the drive shaft is accommodated in the receiving member exclusively for transferring torque.

9. The tool attachment as recited in claim 4, wherein the tool attachment is configured as one of a drill-chuck adapter or an angle attachment.

10. The tool attachment as recited claim 4, wherein the locking section has at least one holding element formed in the manner of a bayonet for mounting and locking on the mounting interface of the hand-held machine tool in a manner protected against twisting.

11. A tool system, comprising:

a hand-held machine tool; and

a tool attachment for mounting on the hand-held machine tool, the tool attachment including;

a tool holder having a receiving member for receiving an insert tool and a first locking sleeve preloaded by a first spring element in an axial direction pointing away from the hand-held machine tool, the tool holder being assigned a mounting interface for mounting the tool attachment;

a drive shaft configured to be driven rotationally;

a locking section for locking on the mounting interface; and

an actuating element configured to shift, upon mounting the tool attachment on the hand-held machine tool, the first locking sleeve against a spring force applied by the first spring element, in the direction of the hand-held machine tool.