Machine tool brake device

Patent metadata

Field	Value
Publication number	US-9987716-B2
Application number	US-201414159163-A
Country	US
Kind code	B2
Filing date	Jan 20, 2014
Priority date	Jan 21, 2013
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A machine tool brake device of a portable machine tool includes at least one magnetic-field-type brake unit that is configured to brake a spindle and/or a machining tool when the magnetic-field-type brake unit is in at least one braking position. The machine tool brake device further includes at least one spindle immobilization unit that is configured to immobilize the spindle when the spindle immobilization unit is in at least one immobilization position. The machine tool brake device also includes at least one activation unit that is configured to transfer the magnetic-field-type brake unit into the braking position and to enable an automatic transfer of the spindle immobilization unit into the immobilization position.

First claim

What is claimed is:

1. A machine tool brake device of a portable machine tool, comprising:
at least one magnetic-field-type brake unit configured to brake one or more of a spindle and a machining tool when the magnetic-field-type brake unit is in at least one braking position;
at least one spindle immobilization unit separate from the at least one magnetic-field-type brake unit and configured to immobilize the spindle when the spindle immobilization unit is in at least one immobilization position; and
at least one activation unit configured to transfer the magnetic-field-type brake unit at least into the braking position and to enable automatically at least a transfer of the spindle immobilization unit into the immobilization position.

2. The machine tool brake device according to claim 1 , wherein the activation unit comprises at least one activation element arranged on the spindle.

3. The machine tool brake device according to claim 1 , wherein the activation unit comprises at least one activation element mounted on the spindle so as to be rotatable relative to the spindle along at least an angle range of less than 360°.

4. The machine tool brake device according to claim 1 , wherein the activation unit is configured to change at least a position of one brake element of the magnetic-field-type brake unit relative to a further brake element of the magnetic-field-type brake unit.

5. The machine tool brake device according to claim 1 , wherein the spindle immobilization unit comprises at least one entrainment element configured to move at least one spindle immobilization element of the spindle immobilization unit.

6. The machine tool brake device according to claim 1 , wherein the spindle immobilization unit comprises at least one entrainment element having at least one clamping contour configured to clamp at least one spindle immobilization element of the spindle immobilization unit.

7. The machine tool brake device according to claim 1 , wherein the spindle immobilization unit comprises at least one spindle immobilization element configured in the form of a rolling element.

8. The machine tool brake device according to claim 1 , further comprising at least one drive output unit including at least one drive output element, wherein the activation unit includes at least one activation element arranged on the drive output element and configured to transfer the magnetic-field-type brake unit into the braking position.

9. The machine tool brake device according to claim 8 , wherein the activation unit comprises at least one further activation element arranged on the drive output element and configured at least to enable a movement capability of a spindle immobilization element of the spindle immobilization unit.

10. A portable machine tool, comprising:
at least one machine tool brake device including:
at least one magnetic-field-type brake unit configured to brake one or more of a spindle and a machining tool when the magnetic-field-type brake unit is in at least one braking position;
at least one spindle immobilization unit separate from the at least one magnetic-field-type brake unit and configured to immobilize the spindle when the spindle immobilization unit is in at least one immobilization position; and
at least one activation unit configured to transfer the magnetic-field-type brake unit at least into the braking position and to enable automatically at least a transfer of the spindle immobilization unit into the immobilization position.

11. The portable machine tool according to claim 10 , wherein the portable machine tool is configured as an angle grinder.

Assignees

• Bosch Gmbh Robert

Inventors

• Maute Joerg
• Esenwein Florian

Classifications

• B24B23/02

  with rotating grinding tools; Accessories therefor · CPC title

• F16D63/002 Primary

  Brakes with direct electrical or electro-magnetic actuation · CPC title

• B60T1/062

  acting on transmission parts · CPC title

• B24B23/022 Primary

  Spindle-locking devices, e.g. for mounting or removing the tool · CPC title

• F16D2121/20

  using electromagnets · CPC title