Hand-held machine tool

• US 20030116332A1
• Filed: 12/03/2002
• Published: 06/26/2003
• Est. Priority Date: 04/06/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Zirn, Oliver, Thome, Ludwig, Nadig, Peter
• Granted Patent: US 7,055,620 B2
• Time in Patent Office: Days
• US Class Current: 173/48
• 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 decelerated when an occurrence of uncontrolled blockage of the insertable tool (16) is detected.

2. The hand power tool according to claim 1, wherein the electric motor (12) is formed by an electronically commutated motor.

3. The hand power tool according to claim 1 or 2, 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).

4. The hand power tool according to one of the preceding claims, wherein the protective device comprises a separate braking unit.

5. The hand power tool according to one of the preceding claims, wherein the sensor unit (20) comprises at least one electronic sensor (42).