Magnetic base

Abstract

The invention relates to a magnetic base for an electric power tool, in particular for a magnetic core drilling machine. The magnetic base having a base body that has a contact surface for contactinga workpiece to be machined, at least one first permanent magnet and at least one second permanent magnet arranged in the base body, the at least one and second permanent magnet having magnetic forcesthat interact to form a resulting holding force. The at least one first permanent magnet and the at least one second permanent magnet are supported in the base body and rotatable around its own rotation axis between a first position, in which the resulting holding force of the magnetic base is maximized, and a second position, in which the resulting holding force of the magnetic base is minimized.

Description

technical field [0001] The invention relates to a magnetic base (Magnetfuß) for an electric machine tool (Elektrowerkzeugmaschine), in particular for a magnetic core drilling machine (Magnetkernbohrmaschine, sometimes called a magnetic core drilling machine), with a base body, which has a and at least one first permanent magnet and at least one second permanent magnet are accommodated therein, the magnetic forces of which work together to form a resultant holding force. Furthermore, the invention relates to an electric power tool and other holding devices. Background technique [0002] Magnetic bases have been known from the prior art for a long time and are often used as part of a drilling machine column for magnetically fixing a drilling machine, in particular a core drilling machine, to a workpiece to be machined. Electromagnets are usually used for this purpose, which are likewise supplied with electrical energy via the voltage supply of the electric power tool connecte...

AI Technical Summary

Problems solved by technology

Here, however, the adjustment of the second permanent magnet relative to the first permanent magnet proves to be disadvantageous, since a relatively complex transmission structure is required for this

Furthermore, the magnetic bases known from the prior art are very high, which is disadvantageous especially in tight spaces

[0006] Especially in the case of the use of magnetic core drilling machines in space-constrained situations (such as I-beams, which are also called double T-beams), it also proves to be disadvantageous that, in order to switch on and off the magnetic base, it usually has to be The adjustment of the second permanent magnet, which is turned by 180° in order to thereby reverse its polarity, can only be realized with this adjustment device with great difficulty, because the space conditions here are so limited that the adjustment device is only difficult for the user grasped and twisted

Furthermore, it has been found to be disadvantageous that the magnetic base can only be used from a certain material thickness, since otherwise the resulting holding force is too low for securely fixing the magnetic base and thus the electric power tool to the workpiece.

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