Tool chucking device

• US 9,463,547 B2
• Filed: 12/27/2011
• Issued: 10/11/2016
• Est. Priority Date: 01/25/2011
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fankhauser, Marcel, Luescher, Bruno
• Primary Examiner(s): Gates, Eric A
• Assistant Examiner(s): JANESKI, PAUL MARTENS
• Application Number:
  US13/981,524
• Publication Number:
  US 20140070499A1
• Time in Patent Office: 1,750 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/142 with reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades
• CPC Class Codes: B24B 23/022 Spindle-locking devices, e.g. for mounting or removing the tool
• CPC Class Codes: B24B 23/04 with oscillating grinding tools; Accessories therefor
• CPC Class Codes: B24B 23/046 Clamping or tensioning means for abrasive sheets
• CPC Class Codes: B24B 45/00 Means for securing grinding wheels on rotary arbors suppression of vibrations in systems F16F15/00; testing static or dynamic balancing of machines G01M1/00
• CPC Class Codes: B24B 45/003 Accessories therefor
• CPC Class Codes: B24B 45/006 Quick mount and release means for disc-like wheels, e.g. on power tools
• CPC Class Codes: B27B 19/006 with oscillating saw blades; Hand saws with oscillating saw blades
• CPC Class Codes: B27B 5/32 Devices for securing circular saw blades to the saw spindle
• CPC Class Codes: Y10T 279/33 Member applies axial force component

Abstract

A tool chucking device, especially an oscillation tool chucking device, includes at least one chucking unit which has at least one chucking element for clamping a treatment tool in an axial direction and at least one control unit for actuating the chucking element. The tool chucking device further includes at least one conversion unit which is designed to modify a conversion ratio depending on at least one movement component of a control element of the control unit.

Claims

1. A tool clamping fixture, comprising:

at least one clamping unit having (i) at least one clamping element configured to clamp a machining tool in an axial direction and (ii) at least one control unit configured to actuate the at least one clamping element; and

at least one conversion unit operatively connected to the at least one clamping element and the at least one control unit, and configured to alter a conversion ratio in dependence on movement of a control element of the at least one control unit, the at least one conversion unit including a control cam surface including a first cam surface portion defining a first cam pitch and a second cam surface portion defining a second cam pitch,

wherein the first cam pitch is different from the second cam pitch,

wherein the conversion ratio is a ratio of a change in position of the control element to a change in position of the at least one clamping element, and

wherein the control element of the at least one control unit is configured as a control lever mounted pivotably about a pivot axis running parallel to the axial direction.

2. The tool clamping fixture as claimed in claim 1, wherein the conversion unit has at least one scanning element configured to move the clamping element in dependence on the course of the control cam along the axial direction.

3. The tool clamping fixture as claimed in claim 2, wherein the scanning element is configured as a bolt.

4. The tool clamping fixture as claimed in claim 3, wherein the bolt has a longitudinal extent which, in a mounted state, runs along a direction extending at least substantially perpendicular to the axial direction.

5. The tool clamping fixture as claimed in claim 1, further comprising at least one decoupling element configured to decouple the control unit in at least one operating mode from a motion of the clamping element.

6. The tool clamping fixture as claimed in claim 1, wherein the control unit comprises at least one scanner receiving element configured to receive a scanning element of the conversion unit, the scanner receiving element being connected at least in a rotationally fixed manner to the control lever.

7. The tool clamping fixture as claimed in claim 1, wherein the tool clamping fixture is an oscillation tool clamping fixture.

8. The portable machine tool as claimed in claim 1, wherein the decoupling unit has at least one stop element configured to limit a motion of the clamping element along the axial direction in the direction of the control unit.

9. The portable machine tool as claimed in claim 1, wherein the first cam pitch and the second cam pitch are mutually differing with respect to a surface of the at least one conversion unit.

10. The portable machine tool as claimed in claim 1, wherein the control element extends from a portion of the at least one conversion unit and is movable relative to the at least one clamping element.

11. A tool clamping fixture, comprising:

at least one clamping unit having (i) at least one clamping element configured to clamp a machining tool in an axial direction and (ii) at least one control unit configured to actuate the clamping element;

at least one conversion unit operatively connected to the at least one clamping unit and the at least one control unit, and configured to alter a conversion ratio in dependence on movement of a control element of the control unit; and

at least one decoupling element configured to decouple the control unit in at least one operating mode from a motion of the clamping element,

wherein the decoupling unit has at least one stop element configured to limit a motion of the clamping element along the axial direction in the direction of the control unit, and

wherein the conversion ratio is a ratio of a change in position of the control element to a change in position of the clamping element.

12. A portable machine tool, comprising:

at least one tool clamping fixture including;

at least one clamping unit having (i) at least one clamping element configured to clamp a machining tool in an axial direction and (ii) at least one control unit configured to actuate the at least one clamping element; and

at least one conversion unit operatively connected to the at least one clamping element and the at least one control unit, and configured to alter a conversion ratio in dependence on movement of a control element of the at least one control unit, the at least one conversion unit including a control cam surface including a first cam surface portion defining a first cam pitch and a second cam surface portion defining a second cam pitch,

wherein the first cam pitch is different from the second cam pitch,

wherein the conversion ratio is a ratio of a change in position of the control element to a change in position of the at least one clamping element, and

wherein the control element of the at least one control unit is configured as a control lever mounted pivotably about a pivot axis running parallel to the axial direction.

13. The portable machine tool as claimed in claim 12, wherein the portable machine has an oscillatingly drivable spindle.