Hand-held machine tool

• US 7,055,620 B2
• Filed: 02/09/2002
• Issued: 06/06/2006
• Est. Priority Date: 04/06/2001
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Thome, Ludwig, Nadig, Peter, Zirn, Oliver
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US10/297,223
• Publication Number:
  US 20030116332A1
• Time in Patent Office: 1,578 Days
• Field of Search: 173/2, 173/176, 173/5, 173/6, 173/178, 173/181, 173/217, 408/6, 408/9, 408/129, 408/122.5, 408/120
• US Class Current: 173/2
• CPC Class Codes: B25D 16/003 Clutches specially adapted therefor
• CPC Class Codes: B25D 2211/003 Crossed drill and motor spindles
• CPC Class Codes: B25D 2250/205 for torque
• CPC Class Codes: B25D 2250/221 Sensors
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Abstract

The invention is based on a hand power tool having an electric motor (12) located in a housing (10), via which an insertable tool (16) situated in a tool mount (14) is capable of being driven in a rotating manner, and having a safety device (18) with which a characteristic value for an occurrence of uncontrolled blockage of the insertable tool (16) can be detected via a sensor unit (20), and the movement of the housing (10) can be decelerated.

It is proposed that the safety device (18) is formed at least partially by a motor control unit (22), via which the electric motor (12) can be actively decelerated when an occurrence of uncontrolled blockage of the insertable tool (16) is detected.

Claims

1. A hand power tool having an electric motor (12) located in a housing (10), via which an insertable tool (16) situated in a tool mount (14) is capable of being driven in a rotating manner, and having a safety device (18) with which a characteristic value for an occurrence of uncontrolled blockage of the insertable tool (16) can be detected via a sensor unit (20), and the movement of the housing (10) can be decelerated,

wherein the safety device (18) is formed at least partially by a motor control unit (22), via which the electric motor (12) can be actively braked when an occurrence of uncontrolled blockage of the insertable tool is detected, and wherein, by means of the electric motor (12), the housing (10) is actively breakable via the insertable tool (16) in the case of uncontrolled blockage and wherein for actively braking the housing (10) in the case of uncontrolled blockage, the electric motor (12) is capable of actively generating a torque that acts opposite to a direction of rotation of the insertable tool (16), said motor (12) being formed as a brushless, electronically commutated reluctance motor.

2. The hand power tool according to claim 1, wherein the motor control unit (22) is designed at least partially integral with an already-present power control unit (24) of the electric motor (12).

3. The hand power tool according to claim 1, wherein the safety device comprises a separate braking unit.

4. The hand power tool according to claim 1, wherein the sensor unit (20) comprises at least one electronic sensor (42).