Tool attachment for a hand-held machine tool

Patent metadata

Field	Value
Publication number	US-9694428-B2
Application number	US-201314084338-A
Country	US
Kind code	B2
Filing date	Nov 19, 2013
Priority date	Nov 22, 2012
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

In a tool attachment for fastening to a fastening interface of a hand-held machine tool, having a locking unit which in an unlocked state makes it possible for the tool attachment to be placed on the fastening interface of the hand-held machine tool and in a locked state makes it possible for the tool attachment to be locked to the fastening interface of the hand-held machine tool for operation, the locking unit having a rotatable locking body, and a first rotational position of the locking body being associated with the unlocked state and a second rotational position of the locking body being associated with the locked state, the locking unit has a locking member which is configured to prevent rotation of the locking body from the second rotational position into the first rotational position in the locked state.

First claim

What is claimed is:

1. A tool attachment for fastening to a fastening interface of a hand-held machine tool, comprising:
a locking unit which in an unlocked state makes it possible for the tool attachment to be placed on the fastening interface of the hand-held machine tool and in a locked state makes it possible for the tool attachment to be locked to the fastening interface of the hand-held machine tool for operation, the locking unit having a rotatable locking body, and a first rotational position of the locking body being associated with the unlocked state and a second rotational position of the locking body being associated with the locked state,
wherein the locking unit has a locking member which is configured to prevent rotation of the locking body from the second rotational position into the first rotational position in the locked state,
wherein the locking unit has an actuating element which is configured to make possible a rotation of the locking body from the first into the second rotational position,
wherein the actuating element further comprises a blocking member which is configured to block the actuating element in a blocking position at the locking body in the locked state, in which blocking position the actuating element urges the locking member at least in portions toward the fastening interface of the hand-held machine tool,
wherein the blocking member is of a resilient configuration at least in regions and has a blocking portion which in the blocking position may be releasably fixed in a fixing member provided on the locking body.

2. The tool attachment according to claim 1 , wherein the locking member is configured to cooperate in the locked state with a locking element associated with the fastening interface of the hand-held machine tool.

3. The tool attachment according to claim 2 , wherein the locking element has at least one set of locking teeth.

4. The tool attachment according to claim 3 , wherein the locking member is of a resilient configuration at least in regions and has at least one locking portion which in the locked state is urged toward the fastening interface of the hand-held machine tool by an elastic deformation of the locking member.

5. The tool attachment according to claim 4 , wherein the locking portion is configured to engage the set of locking teeth in order to prevent the rotation of the locking body from the second rotational position into the first rotational position.

6. The tool attachment according to claim 1 , wherein the locking body is at least partly tubular and the actuating element is rotatably supported on an outer periphery of the locking body.

7. The tool attachment according to claim 1 , wherein at least one driver element is provided on the actuating element and at least one driven member is provided on the locking body, the driver element and the driven member being configured to cooperate for rotary entrainment of the locking body upon actuation of the actuating element to rotate the locking body from the first into the second rotational position.

8. The tool attachment according to claim 7 , wherein the driven member is configured to make possible a rotational movement of the actuating element relative to the locking body at least by a predetermined rotation angle.

9. The tool attachment according to claim 1 , wherein the actuating element is configured to urge the locking member in the locked state at least in portions toward the fastening interface of the hand-held machine tool.

10. The tool attachment according to claim 9 , wherein the actuating element has a control curve which is configured to enable the locking member to be urged at least in portions toward the fastening interface of the hand-held machine tool in the locked state.

11. The tool attachment according to claim 1 , wherein the fixing member is configured in the manner of a recess and the blocking portion is configured to snap into the fixing member in the blocking position in order to prevent automatic rotation of the actuating element relative to the locking body in the locked state.

12. The tool attachment according to claim 1 , wherein the locking body has locking elements which are configured in the manner of bayonets to form a bayonet connection with the fastening interface of the hand-held machine tool.

13. A tool attachment for fastening to a fastening interface of a hand-held machine tool, comprising:
a locking unit which in an unlocked state makes it possible for the tool attachment to be placed on the fastening interface of the hand-held machine tool and in a locked state makes it possible for the tool attachment to be locked to the fastening interface of the hand-held machine tool for operation, the locking unit having a rotatable locking body, and a first rotational position of the locking body being associated with the unlocked state and a second rotational position of the locking body being associated with the locked state,
wherein the locking unit has a locking member which is configured to prevent rotation of the locking body from the second rotational position into the first rotational position in the locked state,
wherein the locking unit has an actuating element which is configured to make possible a rotation of the locking body from the first into the second rotational position,
wherein the actuating element further comprises a blocking member which is configured to block the actuating element in a blocking position at the locking body in the locked state, in which blocking position the actuating element urges the locking member at least in portions toward the fastening interface of the hand-held machine tool,
wherein the locking member and the blocking member are constructed in one piece.

14. A tool system, comprising:
a hand-held machine tool which has a fastening interface, and
a tool attachment for fastening to the fastening interface of the hand-held machine tool, the tool attachment having a locking unit which in an unlocked state makes it possible for the tool attachment to be placed on the fastening interface of the hand-held machine tool and in a locked state makes it possible for the tool attachment to be locked to the fastening interface of the hand-held machine tool for operation, the locking unit having a rotatable locking body which in the unlocked state is disposed in a first rotational position and in the locked state is disposed in a second rotational position on the fastening interface of the hand-held machine tool,
wherein the locking unit has a locking member which is configured to prevent rotation of the locking body from the second rotational position into the first rotational position in the locked state,
wherein the locking unit has an actuating element which is configured to make possible a rotation of the locking body from the first into the second rotational position,
wherein the actuating element further comprises a blocking member which is configured to block the actuating element in a blocking position at the locking body in the locked state, in which blocking position the actuating element urges the locking member at least in portions toward the fastening interface of the hand-held machine tool,
wherein the blocking member is of a resilient configuration at least in regions and has a blocking portion which in the blocking position may be releasably fixed in a fixing member provided on the locking body.

15. A tool system, comprising:
a hand-held machine tool which has a fastening interface, and
a tool attachment for fastening to the fastening interface of the hand-held machine tool, the tool attachment having a locking unit which in

Assignees

• Bosch Gmbh Robert

Inventors

• Tussing Torsten

Classifications

• Y10T279/32

  Means to prevent jaw loosening · CPC title

• B25F3/00 Primary

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

• B23B31/123 Primary

  with locking arrangements (locking arrangements for chucks with simultaneously-acting jaws moving radially actuated by one or more spiral grooves B23B31/16041) · CPC title

• B23B2240/04

  Bayonet connections · CPC title

• Y10T279/17615

  Obliquely guided reciprocating jaws · CPC title