Power tool having a disk-shaped tool, and Method for fastening or for releasing the tool

Abstract

A power tool having a disk-shaped tool, wherein the tool is able to be fastened to a drive shaft of the power tool by means of a fastening nut, wherein the drive shaft is set up to transmit a torque of the drive to the tool. The power tool is set up to loosen or tighten the fastening nut by at least one torque impulse of the drive of the power tool. A method for fastening a disk-shaped tool to a drive shaft of a power tool, and, in a further aspect, a method for releasing a disk-shaped tool from a drive shaft of a power tool is provided. The use of a torque impulse, which can be generated by a drive of a power tool, for tightening or loosening a fastening nut for fastening a disk-shaped tool to the power tool is also provided.

Claims

1-15. (canceled)

16: A power tool comprising: a drive; a drive shaft; a disk-shaped tool fastenable to the drive shaft of the power tool via a fastening nut, the drive shaft being set up to transmit a torque of the drive to the tool; the power tool being set up to loosen or tighten the fastening nut via at least one torque impulse of the drive of the power tool.

17: The power tool as recited in claim 16 wherein the fastening nut is loosenable or tightenable without aids solely by means of the torque impulse of the drive of the power tool.

18: The power tool as recited in claim 16 wherein the drive includes an electronically commutated motor.

19: The power tool as recited in claim 16 wherein the at least one impulse includes a plurality of successive output torque impulses.

20: The power tool as recited in claim 16 further comprising at least one sensor for monitoring the at least one torque impulse.

21: The power tool as recited in claim 16 further comprising a tool fitting for receiving the tool.

22: The power tool as recited in claim 16 further comprising operator-control elements set up to initiate release or tightening of the tool using the fastening nut.

23: The power tool as recited in claim 20 further comprising electronics for evaluating data determined by the at least one sensor for evaluating inputs input via the operator-control elements.

24: The power tool as recited in claim 23 further comprising at least one sensor is arranged between the motor and the electronics.

25: The power tool as recited in claim 16 further comprising electronics for controlling the motor and a power supply of the motor.

26: The power tool as recited in claim 25 further comprising at least one sensor is arranged between the motor and the electronics.

27: The power tool as recited in claim 16 further comprising electrical connections for connecting operator-control elements, electronics, at least one sensor and the motor.

28: The power tool as recited in claim in claim 16 wherein sensor-less feedback of the motor is used to detect a change of angle in the motor.

29: A method for fastening a disk-shaped tool to a drive shaft of a power tool, the method comprising the following steps: a) providing a power tool and a disk-shaped tool for the power tool; b) providing a fastening nut for fastening the tool to the power tool; c) connecting the power tool and the tool via the fastening nut; and d) outputting a torque impulse through the drive of the power tool, the tool thereby being fastened to the drive shaft of the power tool via the fastening nut.

30: The method as recited in claim 29 wherein the torque impulse is output using a sensor.

31: A method for releasing a disk-shaped tool from a drive shaft of a power tool, the method comprising the following steps: a) providing a power tool, a tool being fastened to the power tool via a fastening nut; b) outputting a torque impulse through a drive of the power tool, the fastening nut thereby being loosened; and c) separating the power tool and the tool.

32: The method as recited in claim 31 wherein the torque impulse is output using a sensor.

33: A method comprising: using a torque impulse generatable by a drive of a power tool to tighten or loosen a fastening nut for fastening a disk-shaped tool to a power tool.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the FIGURES, identical and similar components are denoted by the same reference signs. In the drawing:

[0029] FIG. 1 shows a preferred embodiment of the proposed power tool.

DETAILED DESCRIPTION

[0030] FIG. 1 shows a preferred embodiment of the power tool (1) according to the present invention. The power tool (1) can be an angle grinder or a cut-off grinder, for example. The power tool (1) comprises a tool (2) which is disk-shaped in form, for example a cut-off disk or grinding disk. The tool (2) is fastened to a drive shaft (4) of the power tool (1) by means of a fastening nut (3), wherein the drive shaft (4) of the power tool (1) is set up to transmit a torque of the drive of the power tool (1) to the tool (2). The drive of the power tool (1) particularly comprises a motor (5), wherein, in a preferred embodiment of the invention, the drive can also comprise a gearbox (11). The motor (5) is preferably a brushless motor which can be designed in particular to be electronically commutated.

[0031] There is provision in the context of the invention that the power tool (1) is set up to loosen or tighten the fastening nut (3) by means of a torque impulse of the drive of the power tool (1). In other words, the fastening nut (3) can be loosened or tightened by means of a torque impulse of the drive of the power tool (1). The tightening of the fastening nut (3) preferably means, in the context of the invention, that the fastening nut (3) is fastened or fixed to the power tool (1). Preferably, the tool (2) interacts with a tool fitting (7) which is set up to receive the tool (2) and to fasten it to the power tool (1). In the context of the invention, the tool fitting (7) can also be referred to as an output shaft.

[0032] In a preferred embodiment of the invention, the power tool (1) can have at least one sensor (6) for monitoring an output of the at least one torque impulse. Preferably, the outputting of the at least one torque impulse for releasing or fastening the tool (2) occurs with the use of the at least one sensor (6). This preferably means, in the context of the invention, that the sensors (6) of the power tool (1) are set up to monitor the outputting of the at least one torque impulse by means of which the release or fastening of the tool (2) is brought about. The sensors (6) are capable in particular of detecting a position and/or an acceleration. It is preferable in the context of the invention that the at least one sensor (6) is arranged between the motor (5) and the electronics (9). The at least one sensor (6) can be connected in particular to the motor (5) of the power tool (1) or be present in the spatial vicinity thereof.

[0033] Preferably, the power tool (1) comprises operator-control elements (8) which are set up to initiate release or tightening of the tool (2) using the fastening nut (3). Consequently, the user advantageously has to hand a possibility of initiating the preferably aid-free fastening or release of the tool (2). The power tool (1) can also comprise electronics (9) which are preferably set up for evaluating data, which are determined by the at least one sensor (6), for evaluating inputs which are input via the operator-control elements (8) and/or for controlling the motor (5) and its power supply. For this purpose, the power tool (1) can comprise electrical connections (10) which are set up for connecting the operator-control elements (8), the electronics (9), the at least one sensor (6) and/or the motor (5).

LIST OF REFERENCE SIGNS

[0034] 1 Power tool [0035] 2 Disk-shaped tool [0036] 3 Fastening nut [0037] 4 Drive shaft [0038] 5 Motor [0039] 6 Sensor [0040] 7 Tool fitting [0041] 8 Operator-control elements [0042] 9 Electronics [0043] 10 Electrical connections [0044] 11 Gearbox