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Apparatus and method for taking safety measures in power tools

A technology for electric tools and safety measures, applied in the field of devices and methods for taking safety measures in electric tools, can solve the problems of inflexible application of different use environments, high cost, limited evaluation speed, etc., to reduce possible performance, improved safety, and high precision

Active Publication Date: 2014-10-29
ROBERT BOSCH GMBH
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  • Description
  • Claims
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Problems solved by technology

But the identification of "backlash situations" corresponding to this solution is limited to the evaluation of the rotational speed
This only provides a limited protection function, because this evaluation cannot be flexibly applied to different use environments, and also because the large number of parts required for detecting the rotational speed is expensive

Method used

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  • Apparatus and method for taking safety measures in power tools
  • Apparatus and method for taking safety measures in power tools
  • Apparatus and method for taking safety measures in power tools

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Embodiment Construction

[0028] Electronic components are used in modern electrical equipment or power tools for regulation, power boosting, protective functions or additional functions. The electronic components in modern power tools are therefore often equipped with microcontrollers, by means of which these functions are carried out.

[0029] The solutions presented here describe on the one hand a protective function for an electric tool, electric machine tool or electric device, and on the other hand a protective function for the user. The equipment to be protected, such as an electric tool, electric machine tool or electric equipment, is hereinafter simply referred to as "electric equipment". In the solution presented here, a signal is generated from one or more motor parameters such as motor current, armature voltage or the like, which is proportional to the rotational speed or the load of the machine or electric system. A derivative, for example, is formed from a signal proportional to the rota...

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Abstract

The invention relates to a device (10) for taking a safety precaution in an electrical tool, said electrical tool comprising an electric motor (EM) with at least one field winding and an armature winding. The device (10) comprises the following features: a sensor unit (12) which is designed to generate a sensor signal (21) in accordance with a motor current (14) passing through the electric motor (EM), an armature voltage (16) via the armature winding, a voltage (18) via the field winding and / or a commutation frequency (20) in the armature winding; a unit (22) detecting a change of the sensor signal, which is designed to detect a temporal change of the sensor signal (21) and emit a corresponding modification signal (24) on the basis of the detected change; and a safety device (26) which is designed to take a safety precaution (28) in the electrical tool when a value of the modification signal (24) is exceeded or not met in relation to a threshold value.

Description

technical field [0001] The invention relates to a device for implementing safety measures in an electric tool and a method for implementing safety measures in an electric tool. Background technique [0002] Modern power tools require special safety measures for protecting the operator of the power tool in the event of unforeseen events. This event can occur, for example, when the tool is jammed or clenched (a situation known to professionals as "kickback"). In the absence of a safety mechanism, the operator could be seriously injured in such an event. On the other hand, the safety mechanism provided should be cost-effective and simple to implement. [0003] A solution for protecting the user is disclosed in the publication DE 10 2004 004 170A120005.08.18 under the title "Method for disconnecting an electric power tool in the event of jamming and the electric power tool". According to this solution, however, the detection of "kickback situations" is limited to the evaluati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/085B23Q11/04B25F5/00
CPCB25F5/00H02H7/0854
Inventor U·辛格尔M·哈贝尔
Owner ROBERT BOSCH GMBH
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