Tool attachment

• US 9,193,045 B2
• Filed: 10/04/2012
• Issued: 11/24/2015
• Est. Priority Date: 10/14/2011
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Saur, Dietmar, Grunwald, Michael-Andreas
• Primary Examiner(s): Gates, Eric A
• Assistant Examiner(s): Su, Chwen-Wei
• Application Number:
  US13/644,896
• Publication Number:
  US 20130093149A1
• Time in Patent Office: 1,146 Days
• Field of Search: 408/239.A, 279/89, 279/140, 279/144, 279/93, 279/143
• US Class Current: 1/1
• CPC Class Codes: B23B 31/113 Retention by bayonet connection
• CPC Class Codes: B23B 51/12 Adapters for drills or chucks; Tapered sleeves
• CPC Class Codes: B25B 21/00 Portable power-driven screw or nut setting or loosening tools; details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; for mounting or dismounting wheels B60B29/006; Attachments for drilling apparatus serving the same purpose machines B23P19/06
• CPC Class Codes: B25B 21/007 Attachments for drilling apparatus for screw or nut setting or loosening
• CPC Class Codes: Y10T 279/17683 Interlaced jaws
• CPC Class Codes: Y10T 279/32 Means to prevent jaw loosening
• CPC Class Codes: Y10T 279/3406 Adapter
• CPC Class Codes: Y10T 279/3412 Drive conversion
• CPC Class Codes: Y10T 408/957 Tool adapter

Abstract

A tool attachment for mounting on a hand-held machine tool provided with a tool holder, the tool attachment having an output shaft and a base body at whose outer circumference a locking sleeve is disposed in a manner allowing it to rotate to release at least one assigned locking element; at the outer circumference of the base body, an anti-rotation unit is formed for the twist-proof mounting of the base body on a fastening unit assigned to the hand-held machine tool; on the anti-rotation unit and at an inner circumference of the fastening unit, complementary geometrical forms are provided which are configured to mesh with each other for the releasable, twist-proof mounting of the base body on the fastening unit.

Claims

1. A tool attachment for mounting on a hand-held machine tool, provided with a tool holder, comprising:

an output shaft;

a base body, wherein a locking sleeve is disposed at an outer circumference of the base body, so as to allow it to rotate to release at least one assigned locking element; and

an anti-rotation unit, formed at the outer circumference of the base body, for providing a twist-proof mounting of the base body on a fastening unit assigned to the hand-held machine tool, wherein there are complementary geometrical forms on the outer circumference of the anti-rotation unit and at an inner circumference of the fastening unit, and wherein the forms are configured to mesh with each other for the releasable, twist-proof mounting of the base body on the fastening unit,

wherein the anti-rotation unit has at least one bar-like elevation which extends at the outer circumference in a longitudinal direction of the base body for engaging in at least one groove-like cutout assigned to the inner circumference of the fastening unit,

wherein the locking sleeve is assigned a spring element having a predefined spring force which acts upon the locking sleeve in a direction of an assigned locking position so as to bring about the releasable, twist-proof mounting of the base body on the fastening unit, and wherein the locking position corresponds to a first rotational position of the locking sleeve.

2. The tool attachment of claim 1, wherein the anti-rotation unit and the fastening unit form a positive-fit connection.

3. The tool attachment of claim 1, wherein in the context of sliding the base body in a predefined axial direction onto the fastening unit of the hand-held machine tool, the locking sleeve is configured, owing to a deflection of the at least one assigned locking element at at least one guide edge of an at least one control element assigned to the fastening unit, to execute a rotational movement against the spring force of the spring element, from the assigned locking position into an assigned release position, the release position corresponding to a second rotational position of the locking sleeve.

4. The tool attachment of claim 3, wherein in the context of sliding the base body in the predefined axial direction onto the fastening unit of the hand-held machine tool, upon reaching an assigned axial end position, the locking sleeve is configured, owing to the spring force of the spring element, to execute a rotational movement from the assigned release position into the assigned locking position, so as to allow the at least one assigned locking element to engage behind the at least one control element.

5. The tool attachment of claim 1, wherein the releasable, twist-proof mounting of the base body on the fastening unit of the hand-held machine tool is releasable by a rotation of the locking sleeve in a direction of rotation directed against the spring force of the spring element, from the assigned locking position into the assigned release position.

6. The tool attachment of claim 1, wherein the at least one groove-like cutout is configured for receiving the bar-like elevation.

7. The tool attachment of claim 1, wherein the at least one locking element is arranged on an inner circumference of the locking sleeve, and configured to engage behind at least one corresponding control element assigned to an outer circumference of the fastening unit.

8. A tool attachment for mounting on a hand-held machine tool, provided with a tool holder, comprising:

an output shaft;

a base body, wherein a locking sleeve is disposed at an outer circumference of the base body, so as to allow it to rotate to release at least one assigned locking element; and

an anti-rotation unit, formed at the outer circumference of the base body, for providing a twist-proof mounting of the base body on a fastening unit assigned to the hand-held machine tool, wherein there are complementary geometrical forms on the outer circumference of the anti-rotation unit and at an inner circumference of the fastening unit, and wherein the forms are configured to mesh with each other for the releasable, twist-proof mounting of the base body on the fastening unit,

wherein the anti-rotation unit has at least one bar-like elevation which extends at the outer circumference in a longitudinal direction of the base body for engaging in at least one groove-like cutout assigned to the inner circumference of the fastening unit,

wherein a drive unit is connected to the base body and has an eccentric gear for driving the output shaft.

9. A hand-held machine tool, comprising:

a tool holder;

a housing, on which a tool attachment having an output shaft and a base body is mountable, a locking sleeve being disposed in a manner allowing it to rotate so as to release at least one assigned locking element being provided at an outer circumference of the base body; and

a fastening unit for providing a twist-proof mounting of an anti-rotation unit provided at the outer circumference of the base body, wherein complementary geometrical forms are provided at an inner circumference of the fastening unit and on the outer circumference of the anti-rotation unit, and wherein the forms are configured to mesh with each other for the releasable, twist-proof mounting of the base body on the fastening unit,

wherein the anti-rotation unit has at least one bar-like elevation which extends at the outer circumference in a longitudinal direction of the base body for engaging in at least one groove-like cutout assigned to the inner circumference of the fastening unit,

wherein the locking sleeve is assigned a spring element having a predefined spring force which acts upon the locking sleeve in a direction of an assigned locking position so as to bring about the releasable, twist-proof mounting of the base body on the fastening unit, and wherein the locking position corresponds to a first rotational position of the locking sleeve.

10. The hand-held machine tool of claim 9, wherein the fastening unit further comprises at least one control element arranged on an outer circumference of the fastening unit, and configured to be engaged behind by the at least one assigned locking element assigned to an inner circumference of the locking sleeve.

11. A tool system, comprising:

a hand-held machine tool; and

a tool attachment;

wherein the hand-held machine tool includes a tool holder and a housing, on which a base body of the tool attachment is provided with an output shaft is mountable, wherein a locking sleeve is disposed so as to allow it to rotate so as to release at least one assigned locking element provided at an outer circumference of the base body, wherein a fastening unit for providing a twist-proof mounting of an anti-rotation unit is provided at the outer circumference of the base body is provided on the housing, complementary geometrical forms being provided at an inner circumference of the fastening unit and on the outer circumference of the anti-rotation unit, and wherein the forms are configured to mesh with each other for the releasable, twist-proof mounting of the base body on the fastening unit,

wherein the anti-rotation unit has at least one bar-like elevation which extends at the outer circumference in a longitudinal direction of the base body for engaging in at least one groove-like cutout assigned to the inner circumference of the fastening unit,

wherein the locking sleeve is assigned a spring element having a predefined spring force which acts upon the locking sleeve in a direction of an assigned locking position so as to bring about the releasable, twist-proof mounting of the base body on the fastening unit, and wherein the locking position corresponds to a first rotational position of the locking sleeve.