Portable machine tool

• US 9,079,290 B2
• Filed: 09/21/2011
• Issued: 07/14/2015
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Esenwein, Florian
• Primary Examiner(s): NGUYEN, GEORGE BINH MINH
• Application Number:
  US13/882,005
• Publication Number:
  US 20130288581A1
• Time in Patent Office: 1,392 Days
• Field of Search: 451342-359, 451/363
• US Class Current: 1/1
• CPC Class Codes: B24B 23/028 Angle tools
• 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 45/006 Quick mount and release means for disc-like wheels, e.g. on power tools
• CPC Class Codes: B24B 55/00 Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition of general applicability for machine tools B23Q11/00; in general F16P
• CPC Class Codes: B27B 5/32 Devices for securing circular saw blades to the saw spindle

Abstract

A portable machine tool, in particular a hand machine tool, has at least one spindle for receiving and for driving a processing tool, at least one brake unit for braking the spindle and/or the processing tool at least in a braking mode, and at least one runoff safety unit for preventing the processing tool from running off of the spindle at least in the braking mode.

Claims

1. A portable power tool comprising:

at least one spindle configured to receive and drive a working tool;

at least one braking unit configured to brake at least one of the at least one spindle and the working tool, at least when in a braking mode;

at least one runoff safety unit configured to prevent the working tool from running off the at least one spindle, at least when in the braking mode;

a coding unit configured to generate a coding, at least between the at least one spindle and the at least one runoff safety unit such that the at least one spindle and the at least one runoff safety device have an enciphered interface.

2. The portable power tool as claimed in claim 1, wherein the coding unit includes a mechanical coding unit.

3. The portable power tool as claimed in claim 2, wherein the coding unit includes at least one coding element having a geometric shape defined by a basic circle and at least one coding structure projecting beyond the basic circle.

4. The portable power tool as claimed in claim 2, wherein:

the coding unit includes at least one coding element and a form-closure element, and

the at least one coding element defines at least one longitudinal recess configured to receive the form-closure element.

5. The portable power tool as claimed in claim 2, wherein:

the coding unit includes at least one coding element and a form-closure element, and

the at least one coding element defines at least one transverse recess configured to receive the form-closure element.

6. The portable power tool as claimed in claim 1, wherein the coding unit includes at least one of an electronic, an electrical, a magnetic, and an electromagnetic coding unit.

7. The portable power tool as claimed in claim 6, wherein the coding unit includes at least one RFID coding element supported on the at least one runoff safety unit.

8. The portable power tool as claimed in claim 1, wherein the braking unit includes a mechanical brake.

9. The portable power tool as claimed in claim 1, wherein the braking unit includes an electromagnetic brake.

10. The portable power tool as claimed in claim 1, wherein the braking unit is realized as a mountable module.

11. A power tool system, comprising:

a portable power tool having;

(i) at least one spindle configured to receive and drive a working tool;

(ii) at least one braking unit configured to brake at least one of the at least one spindle and the working tool, at least when in a braking mode, the at least one braking unit being realized as a mountable module; and

(iii) at least one runoff safety unit configured to prevent the working tool from running off the at least one spindle, at least when in the braking mode; and

at least one additional mountable module,

wherein the at least one additional mountable module is configured to be mounted on the portable power tool as an alternative to the at least one braking unit.