Hand-held power tool

Patent metadata

Field	Value
Publication number	US-10478959-B2
Application number	US-201615550838-A
Country	US
Kind code	B2
Filing date	Feb 25, 2016
Priority date	Feb 25, 2015
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A hand-held power tool which includes a gear housing with a gear for transmitting a torque, generated by a drive motor, to a spindle. The gear housing is exchangeably connectable to a tool attachment via an interface in such a way that a torque is transmitted from the spindle to an input spindle of the tool attachment. The interface includes a housing-side interface element with a flange ring, which is connected to the gear housing in a torsionally stiff manner. The housing-side interface element corresponds to a tool attachment-side interface element which includes a fastening ring that is rotatably supported on the tool attachment. The fastening ring is brought into engagement with the flange ring by a coupled rotatory and axial relative movement of the fastening ring with respect to the flange ring so that the fastening ring and the flange ring together form a bayonet-type connector.

First claim

What is claimed is:

1. A hand-held power tool, comprising:
a gear housing with a gear for transmitting a torque, generated by a drive motor, to a spindle that rotates about a rotation axis and defines an axial direction; and
a housing-side interface element, the gear housing being exchangeably connectable to a tool attachment via the housing-side interface element in such a way that a torque is transmitted from the spindle to an input spindle of the tool attachment, the housing-side interface element including a flange ring that is connected to the gear housing in a torsionally stiff manner, and the housing-side interface element corresponding to a tool attachment-side interface element which includes a fastening ring that is rotatably supported on the tool attachment, the fastening ring being brought into engagement with the flange ring by a coupled rotatory and axial relative movement of the fastening ring with respect to the flange ring in such a way that the fastening ring and the flange ring together form a bayonet-type connector,
wherein the flange ring has at least one beveled undercut that extends in a circumferential direction of the flange ring and has a variable slope.

2. The hand-held power tool as recited in claim 1 , wherein the tool attachment-side interface element also includes a detent ring, the bayonet-type connector being locked by rotating the fastening ring with respect to the detent ring.

3. The hand-held power tool as recited in claim 2 , wherein the detent ring and the fastening ring are rotatably supported on the tool attachment, and the housing-side interface element includes at least one fixing element that nonrotatably fixes the detent ring with respect to the flange ring when the fastening ring is engaged with the flange ring.

4. The hand-held power tool as recited in claim 2 , wherein the detent ring has at least one first recess that cooperates with at least one corresponding detent element of the fastening ring in such a way that when the bayonet-type connector is set up, the detent element engages with the first recess at a defined rotation angle of the fastening ring with respect to the detent ring, thus achieving the locking of the fastening ring with respect to the detent ring.

5. The hand-held power tool as recited in claim 1 , wherein the housing-side interface element includes at least one rib element that is brought into engagement with at least one corresponding detent lug of the tool attachment-side interface element in such a way that the tool attachment is nonrotatably fixed with respect to the gear housing when the bayonet-type connector is set up.

6. A hand-held power tool, comprising:
a gear housing with a gear for transmitting a torque, generated by a drive motor, to a spindle that rotates about a rotation axis and defines an axial direction; and
a housing-side interface element, the gear housing being exchangeably connectable to a tool attachment via the housing-side interface element in such a way that a torque is transmitted from the spindle to an input spindle of the tool attachment, the housing-side interface element including a flange ring that is connected to the gear housing in a torsionally stiff manner, and the housing-side interface element corresponding to a tool attachment-side interface element which includes a fastening ring that is rotatably supported on the tool attachment, the fastening ring being brought into engagement with the flange ring by a coupled rotatory and axial relative movement of the fastening ring with respect to the flange ring in such a way that the fastening ring and the flange ring together form a bayonet-type connector,
wherein the tool attachment-side interface element also includes a detent ring, the bayonet-type connector being locked by rotating the fastening ring with respect to the detent ring,
wherein the flange ring has at least one beveled undercut that extends in a circumferential direction of the flange ring and has a variable slope, at least one corresponding undercut element on the fastening ring engaging with the undercut in the manner of a bayonet joint when the bayonet-type connector is set up, and when a rotation of the fastening ring is applied, the undercut element being guided along the slope of the beveled undercut in such a way that an axial motion component of the fastening ring with respect to the flange ring is brought about in a first defined angular range of the rotation.

7. The hand-held power tool as recited in claim 6 , wherein the fastening ring has at least one beveled second undercut that extends in the circumferential direction of the fastening ring and has a variable slope, at least one corresponding second undercut element on the flange ring engaging with the second undercut in the manner of a bayonet joint when the bayonet-type connector is set up, and when a rotation of the fastening ring is applied, the second undercut element being guided along the slope of the beveled second undercut in such a way that an axial motion component of the fastening ring with respect to the flange ring is brought about in a first defined angular range of the rotation.

8. The hand-held power tool as recited in claim 7 , wherein the variable slope of the beveled undercut is designed in such a way that in a second defined angular range of the rotation, the rotation applied to the fastening ring does not bring about an axial motion component of the fastening ring with respect to the flange ring.

9. The hand-held power tool as recited in claim 8 , wherein the detent ring has at least one second recess that cooperates with at least one detent element of the fastening ring in such a way that when the bayonet-type connector is released, the detent element engages with the second recess at a defined rotation angle of the fastening ring with respect to the detent ring, thus achieving anti-twist protection of the fastening ring with respect to the detent ring when the housing-side interface element and the tool attachment-side interface element are not engaged with one another.

10. The hand-held power tool as recited in claim 9 , wherein the second defined angular range of the rotation corresponds to a range that extends from the engagement of the detent element with the first recess to a rotation of the fastening ring with respect to the detent ring about a defined rotation angle, and the first defined angular range of the rotation corresponds to the remaining rotation angles of the fastening ring with respect to the detent ring until the engagement of the detent element with the second recess.

11. A tool attachment for exchangeable connection to a hand-held power tool, comprising:
a tool attachment-side interface element that is exchangeably connectable to a housing-side interface element, the tool attachment-side interface element including a fastening ring that is rotatably supported on the tool attachment, wherein the fastening ring is brought into engagement with the housing-side interface element by a coupled rotatory and axial relative movement of the fastening ring with respect to the housing-side interface element in such a way that the fastening ring and the housing-side interface element together form a bayonet-type connector,
wherein the housing-side interface element includes a flange ring,
wherein the flange ring has at least one beveled undercut that extends in a circumferential direction of the flange ring and has a variable slope.

12. The tool attachment as recited in claim 11 , wherein the housing-side interface element includes a flange ring that may be brought into engagement with the fastening ring by a coupled rotatory and axial relative movement of the fastening ring wit

Assignees

• Bosch Gmbh Robert

Inventors

• Brennenstuhl Jens
• Hoffmann-Sugland Michael
• Mock Stefan

Classifications

• B25F3/00 Primary

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

• B23B2231/04

  Adapters · CPC title

• B23B2231/06

  Chucks for handtools having means for opening and closing the jaws using the driving motor of the handtool · CPC title

• B23B45/003

  Attachments · CPC title

• Y10T279/3412

  Drive conversion · CPC title