electrical tools

A technology for electric tools and knives, applied in the field of electric tools, can solve problems such as laboriousness, and achieve the effects of reducing acoustic emission, eliminating passive devices, and avoiding influences

Inactive Publication Date: 2016-06-15
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is laborious to provide such passive means for noise reduction

Method used

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  • electrical tools

Examples

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Embodiment Construction

[0018] figure 1 By way of example, a hand-held percussion drill with a tool holder 10 for receiving a drill bit 12 is shown, which can be operated at a plurality of rotational frequencies via a transmission 24 and an intermediate stage 25 via an electric motor 14 arranged in a housing 40 and via pneumatic The percussion mechanism 42 is driven with a percussion frequency. The percussion mechanism 42 has an actuating piston 46 guided in the hammer tube 44 , which acts on the shank end of the drill bit via an air cushion 48 , a striker or floating piston 50 and a hammer head 52 . It should be noted that impact generation can also be performed by means of a swashplate in a percussion drill. The impact generation shown here by means of an impact mechanism with piston, impactor and hammer head is preferred in the case of a hammer drill.

[0019] The electric motor 14 can be controlled or regulated by means of a control and / or regulating device 26 actuatable via the switch 15 .

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Abstract

The present invention relates to a power tool, comprising an electric motor (14) for driving a tool unit (10, 12), having a device (21) for generating destructive interferences in order to reduce noise occurring during operation.

Description

technical field [0001] The invention relates to an electric tool. Background technique [0002] Power tools, in particular drilling rigs, are known in a wide variety of embodiments. A drilling machine is in particular a tool with which a hole can be drilled into a corresponding object by means of a drill bit. The drill bit is set in the desired rotational motion by a torque generator, usually an electric motor. As specific embodiments of drilling machines, reference should be made especially to percussion drilling machines, percussion hammers, hammer drills and cordless drilling machines. In addition to drills, the possibility of using, for example, chisels as inserts should also be pointed out. [0003] Such drilling machines, especially percussion drilling machines or hammer drilling machines, have a strong noise emission. In this case, the noise generation is primarily directed at the electric motor used or the transmission acted upon by the electric motor. In additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25D17/11G10K11/178
CPCB25D17/11B25D2250/221B25F5/00G10K11/1785G10K11/1787G10K2210/121
Inventor H·吕布扎门A·施莱格尔
Owner ROBERT BOSCH GMBH
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