Tool attachment for a hand-held power tool

Patent metadata

Field	Value
Publication number	US-10259111-B2
Application number	US-201414781876-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Apr 3, 2013
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A tool attachment for a handheld power tool that has a housing having a fastening interface includes: an attachment housing on which there is situated a locking unit for locking the tool attachment on the fastening interface of the handheld power tool; a tool receptacle for accommodating an insertion tool; and a hammer mechanism situated in the attachment housing, which hammer mechanism is configured to apply an impact in the axial direction of the tool receptacle on the insertion tool, during hammer operation of the tool attachment.

First claim

What is claimed is:

1. A tool attachment for a handheld power tool having a housing with a fastening interface opening, wherein the tool attachment is detachably locked on the fastening interface opening of the handheld power tool, the tool attachment comprising:
an attachment housing;
a locking unit situated on the attachment housing for locking the tool attachment on the fastening interface of the handheld power tool;
a tool receptacle accommodating an insertion tool; and
a hammer mechanism situated in the attachment housing and configured to apply an impact in the axial direction of the tool receptacle on the insertion tool during hammer operation of the tool attachment.

2. The tool attachment as recited in claim 1 , wherein the hammer mechanism is a pneumatic hammer mechanism.

3. The tool attachment as recited in claim 1 , wherein the hammer mechanism has a beater which, during operation of the tool attachment, is driven by a piston allocated to the beater, to impact against an impact bolt.

4. The tool attachment as recited in claim 3 , wherein the impact bolt is connected to a driven element allocated to the tool receptacle.

5. The tool attachment as recited in claim 1 , wherein the hammer mechanism is a mechanical hammer mechanism.

6. The tool attachment as recited in claim 5 , wherein the hammer mechanism has a drive element situated coaxially to the tool receptacle.

7. The tool attachment as recited in claim 5 , wherein the tool receptacle has a driven spindle rotatable about a specified axis of rotation which coincides with a drive axis of the hammer mechanism.

8. The tool attachment as recited in claim 6 , wherein the drive element has a free end on which a polygonal entrainment contour is provided.

9. The tool attachment as recited in claim 5 , wherein the hammer mechanism is configured for immediate impact driving of a driven element allocated to the tool receptacle during hammer operation of the tool attachment, the driven element being configured to transmit corresponding impact impulses immediately to the insertion tool.

10. The tool attachment as recited in claim 5 , wherein the hammer mechanism has an impact body which is spring-loaded by a spring element, the impact body being coupled to an allocated spring tension element via a ball guide.

11. The tool attachment as recited in claim 10 , wherein the hammer mechanism has an engaging clutch selectively actuated in order to activate the hammer operation of the hammer mechanism.

12. The tool attachment as recited in claim 5 , wherein a gear mechanism is situated in the attachment housing.

13. The tool attachment as recited in claim 5 , further comprising:
a step-up gear mechanism configured to increase a rotational speed for driving the hammer mechanism relative to a rotational speed of a driven element.

14. The tool attachment as recited in claim 5 , wherein the tool receptacle is configured to accept at least one of an SDS-plus insertion tool and an SDS-quick insertion tool.

15. The tool attachment as recited in claim 5 , wherein the tool receptacle is configured to accept at least one of a round-shaft insertion tools and a hex insertion tool.

16. The tool attachment as recited in claim 5 , wherein the tool attachment is configured for positive-fit driving by the handheld power tool.

17. A tool system, comprising:
a handheld power tool including a housing having a fastening interface; and
a tool attachment, wherein the tool attachment is detachably locked on the fastening interface of the handheld power tool, the tool attachment having:
an attachment housing;
a locking unit situated on the attachment housing for locking the tool attachment on the fastening interface of the handheld power tool;
a tool receptacle accommodating an insertion tool; and
a hammer mechanism situated in the attachment housing and configured to apply an impact in the axial direction of the tool receptacle on the insertion tool during hammer operation of the tool attachment.

18. The tool system as recited in claim 17 , wherein the handheld power tool is one of a battery-operated screw driller or a battery-operated screwdriver.

19. The tool system as recited in claim 17 , wherein the tool attachment is configured to be driven with a positive fit by the handheld power tool.

20. The tool system as recited in claim 17 , wherein:
the handheld power tool has a drive spindle; and
the tool receptacle of the tool attachment has a driven spindle, the drive spindle and the driven spindle having, after fastening of the tool attachment on the handheld power tool, a common axis of rotation.

21. A tool attachment for a handheld power tool having a housing with a fastening interface opening, wherein the tool attachment is detachably locked on the fastening interface opening of the handheld power tool, the tool attachment comprising:
an attachment housing;
a locking unit situated on the attachment housing for locking the tool attachment on the fastening interface of the handheld power tool;
a tool receptacle accommodating an insertion tool; and
a hammer mechanism situated in the attachment housing and configured to apply an impact in the axial direction of the tool receptacle on the insertion tool during hammer operation of the tool attachment,
wherein the hammer mechanism is a mechanical hammer mechanism,
wherein the hammer mechanism has an impact body which is spring-loaded by a spring element, the impact body being coupled to an allocated spring tension element via a ball guide,
wherein the hammer mechanism has an engaging clutch selectively actuated in order to activate the hammer operation of the hammer mechanism,
wherein the engaging clutch is configured to enable, upon actuation, a drive of the spring tension element to tension and release the spring element.

Assignees

• Bosch Gmbh Robert

Inventors

• Herr Tobias
• Saur Dietmar
• Welke Joerg
• Roehm Heiko
• Blum Jens

Classifications

• B25F3/00 Primary

  Associations of tools for different working operations with one portable power-drive means; Adapters therefor · CPC title

• B25D2250/051

  Couplings, e.g. special connections between components · CPC title

• B25D9/06

  Means for driving the impulse member · CPC title