EP2200785A1 - Elektrohandwerkzeugmaschine sowie verfahren zum betreiben einer elektrohandwerkzeugmaschine - Google Patents
Elektrohandwerkzeugmaschine sowie verfahren zum betreiben einer elektrohandwerkzeugmaschineInfo
- Publication number
- EP2200785A1 EP2200785A1 EP08774820A EP08774820A EP2200785A1 EP 2200785 A1 EP2200785 A1 EP 2200785A1 EP 08774820 A EP08774820 A EP 08774820A EP 08774820 A EP08774820 A EP 08774820A EP 2200785 A1 EP2200785 A1 EP 2200785A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitive switch
- power tool
- hand tool
- electric power
- electric hand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/006—Containing a capacitive switch or usable as such
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
- H01H2300/024—Avoid unwanted operation
Definitions
- the invention relates to an electric power tool with a main switch and at least one safety device for releasing the function of the electric power tool.
- the invention relates to a method for operating an electric hand-held power tool, which comprises a main switch and at least one safety device for enabling the function of the electric hand-held power tool.
- Electric hand tool machine is used for switching on and off and optionally for stepped or continuous adjustment of an operating parameter of the electric hand tool.
- the rotational speed of an electric motor of the electric handheld power tool can be adjusted by means of the main switch. It is also known
- the safety device is integrated into the electric hand tool machine in such a way that it can release or prevent the function of the electric hand tool, so that in the latter case, despite actuated main switch, the electric hand tool is not usable, since the function is not released by the safety device.
- the safety device for example, unintentional switching on the electric hand tool machine should be prevented.
- two switch-on levels are necessary to turn the device on. This may be two separate or spaced mechanical switches attached to the power hand tool, or a switch combining two switching functions.
- the latter can for example be designed so that first a pressing, then turning or vice versa must be done to activate the electric hand tool.
- Such combined switches are complicated and impractical to operate, especially when the user of the power hand tool must wear gloves at work to make it difficult to operate such a combined switch.
- Electric hand tool has at least one of a handle of the electric hand tool machine associated capacitive switch. It is thus provided a non-contact safety device for the electric hand tool, which is associated with the handle of the electric hand tool and can thereby detect whether a user's hand is applied to the handle or whether a user holds the electric hand tool in the proper manner. Due to the advantageous embodiment, it does not matter whether the user wears gloves, as a direct contact with the user's hand is not necessary. The hand only has to dive into the electric field of the capacitive switch. If the capacitive switch is actuated or detects the capacitive switch, the hand of a user, the function of the electric power tool is released, so that the user receives the desired function upon actuation of the main switch.
- a handle of the electric hand tool machine is understood to be any area of the electric hand tool machine intended for holding and / or operating. This may be both a region of the electric hand-held power tool arranged on the housing of the electric hand-held power tool and a (grip) region projecting from the housing.
- the function of the electric hand-held power tool is a touch operation and / or a rest operation. Under a touch operation is to be understood in this case the operation of the electric power tool by an active operation of the main switch by a user. When resting operation, it is sufficient if the user once operated the main switch and locks or locks, whereby the electric hand tool continues to run, even if the user does not operate the main switch.
- the latching operation can be realized for example by a mechanical engagement of the main switch, wherein the safety device releases the locking. Of course, an "electrical" locking is conceivable.
- the capacitive switch has at least one dielectric sensor region arranged on the handle.
- the capacitive switch advantageously has a measuring capacitor whose capacitance changes between the capacitor plates by introducing a dielectric, in particular by introducing the hand of the user.
- the then additionally measured current serves as a measuring signal for the capacitive switch.
- an alternating voltage is applied to the measuring capacitor and the impedance of the system is measured.
- the dielectric sensor region which is determined by the arrangement of the measuring capacitor, is advantageously on the electric hand tool or the handle of the
- the capacitive switch is advantageously located at a location of the power hand tool that requires the user to hold / guide and operate the power hand tool with both hands.
- the capacitive switch has at least two spaced-apart dielectric sensor regions. These can be assigned to a handle or in each case a handle.
- they are associated with a handle, so that it can be detected or determined whether the user wraps around the handle of the electric hand-held power tool, for example with the whole hand. In this case, therefore, the user would have to completely enclose the handle by hand in order to release the function of the electric hand-held power tool or to actuate the safety device.
- the dielectric sensor areas of the capacitive switch on the handle are substantially opposite each other.
- the capacitive switch has at least one exciter electrode and at least one receiver electrode. These are designed and / or arranged such that the hand of the user or their position can be detected. Conveniently, the potential of the excitation electrode and the receiver electrode is related to the grounding potential of the electric hand tool.
- the operating frequency of the capacitive switch is preferably chosen to be much higher than the mains frequency in order to avoid interference and to enable a safe suppression of electrical low-frequency interference. Furthermore, the operating frequency is advantageously chosen low enough, so that inexpensive components can be used for example for the audio frequency range.
- the signal form of the excitation voltage is irrelevant. Both a sinusoidal signal and other signal forms, such as a rectangular signal, may be used.
- the capacitive switch is designed as a multi-channel capacitive switch.
- the capacitive switch has a plurality of electrode pairs and thus a plurality of dielectricity sensor regions.
- the provision of a plurality of dielectric sensor regions has the additional advantage that, for example, when placing the electric hand tool with one side on a metallic substrate, only one measuring capacitor Dielektrizticians capableung detected, and an unintentional activation of the electric power tool or a release of the main switch is prevented.
- the capacitive switch advantageously has a plurality of excitation electrodes operated at different frequencies. Wherein these interact with a corresponding number of receiver electrodes or advantageously with a smaller number or only one receiver electrode.
- the multi-channel capacitive switch can be formed in a simple manner.
- a separate measuring amplifier is required for each receiver electrode.
- At least one capacitive switch assigned to a handle of the electric hand-held power tool is used for the safety device.
- the advantageous method can be detected without contact, whether a user holds the electric power tool in a designated manner or operated. If the capacitive switch "actuated", the safety device gives the function of
- Electric hand tool machine free, so that, for example, an electric motor of the electric hand tool machine can be controlled.
- the capacitive switch or the safety device expediently outputs the function of the electric handheld power tool when a predetermined dielectricity of at least one dielectricity sensor region of the capacitive switch is changed or exceeded.
- a change in the dielectric for example, a measuring capacitor of the capacitive switch detected, so the function of the electric power tool is released.
- a limit for the dielectric which must be exceeded, so that the function of the electric power tool is released.
- the capacitive switch releases the function of the electric handheld power tool when a predetermined dielectricity of the at least one dielectric sensor region is detected.
- the predetermined dielectricity is also to be understood as a dielectricity range.
- the capacitive switch can be designed such that it can only be activated or actuated by the human hand of a user.
- the safety device releases the function of the electric hand-held power tool on actuation of the capacitive switch for a certain time and / or for the duration of the actuation of the main switch.
- the safety device releases the function of the electric machine for a certain time or as long as the main switch is operated.
- a combination of the two options is provided, whereby, for example, the electric hand tool after a (one-time) operation of the capacitive switch for a certain period of time is usable, and after failure of an operation of the main switch within the period of time, the capacitive switch must be pressed again to the function the handheld power tool (again) release.
- the capacitive switch releases the function of the electric power tool for the duration of its operation.
- the electric power tool is turned off as soon as the user removes his hand from the handle having the capacitive switch. This has advantages, for example, when the user is torn out of the hand of the electric hand tool machine during operation.
- FIG. 3 shows the schematic structure of an advantageous capacitive switch
- FIG. 1 shows an embodiment in one embodiment
- the angle grinder 2 has a housing 3, in which an electric motor 4 and a control circuit not shown here are arranged.
- the housing 3 is substantially cylindrical.
- a transmission housing 5 connects to the housing 3, wherein in the transmission housing 5 cooperating with the electric motor 4 transmission is arranged, which transmits the drive power of the electric motor 4 on a grinding wheel 6 of the angle grinder 2.
- a co-operating with the control circuit main switch 7 for actuating the angle grinder 2 is further arranged.
- the main switch 7 is designed as a mechanically operated switch, for example as a common pressure lever switch.
- the electric hand tool 1 and the angle grinder 2 further comprises a safety device 8, which cooperates with the main switch 7 or with the electric motor 4 such that the function of the electric power tool 1 or angle grinder 2 only then is released when a capacitive switch 9 is also actuated or activated by the user. This prevents, for example, that the electric hand tool 1 is activated inadvertently.
- the capacitive switch 9 has, in the present embodiment, two spaced-apart dielectric sensor regions 10 and 11. Each of the sensor regions 10, 11 is formed by an exciter electrode 12 and a receiver electrode 13 cooperating therewith.
- the electrodes 12, 13 are not visible from the outside arranged in the housing 3, so that the surface of the housing 3 design can be made sophisticated design, for example by marking the sensor areas 10,11 on the outside of the housing 3.
- the internal arrangement is the Capacitive switch beyond not susceptible to wear.
- the sensor regions 10, 11 or the capacitive switch 9 are arranged in the region of a handle 14.
- the measuring capacitor 15 consists of two or more conductive materials or is designed as at least one electrically conductive coating on the inside of the housing 3.
- the control circuit which controls it.
- a DC voltage or preferably an AC voltage can be applied to the measuring capacitor 15.
- the impedance of the system is detected.
- the potentials of the exciter electrode 12 and the receiver electrode 13 are related to the ground potential of the electric hand tool 1.
- the user In operation, the user must also actuate or activate the capacitive switch 9 in addition to the main switch 7, so that the function of the electric power tool 1 is released.
- the function of the electric hand tool machine in addition to or instead of a touch operation, as described above, may also be a latching operation.
- the arrangement of the sensor areas 10 and 11 at substantially two opposite sides of the handle 14 assumes that the user is doing the Electric hand tool 1 by hand "completely” encloses. The release of the function can be done by the main switch 7 or the electric motor 4 are released electronically or mechanically upon activation of the capacitive switch 9.
- the capacitive switch 9 is arranged on a projecting from the housing 3 second handle, so that the user must hold the electric hand tool 1 with two hands in order to use them.
- the capacitive switch 9 is designed as a multi-channel switch, wherein two exciter electrodes 12 cooperate with a receiver electrode 13. The first one
- Exciter electrode 16 is acted upon by a different frequency than the second exciter electrode 17. Both exciter electrodes 12 are connected to the voltage source and coupled to the receiver electrode 13 in a variable degree.
- the safety device 8 or the capacitive switch 9 furthermore has a frequency-selective measuring amplifier 18, which amplifies and spectrally filters the voltages or currents applied to the exciter electrodes 12.
- the safety device 8 has a discriminator 19, which compares the amplitude at the output of the frequency-selective measuring amplifier 18 with a reference value and on the basis of the result, whether the capacitive coupling between exciter electrodes 12 and receiver electrode 13 increases by the encompassing of the tool by hand and the tool can be used or whether no increase in the capacitive coupling has been observed and the tool for this reason must not be put into operation.
- the user is now the main switch 7 so verifies the safety device 8 whether the electric hand tool 1 may be used or whether the capacitive switch 9 has been actuated.
- the operating frequency f of the exciter electrodes 12 is expediently chosen to be much higher than the mains frequency in order to avoid interference and / or to allow safe fading of low frequency electrical noise. Particularly advantageous is the frequency range of 2 kHz to 10 kHz.
- the excitation voltage may be both a sinusoidal signal and a signal having a different signal form, such as a rectangular signal.
- FIG. 3 shows a further exemplary, schematically illustrated construction of the safety device 8 or of the capacitive switch 9.
- an excitation electrode 12 is shown which is connected to an AC voltage source 21 with, for example, 5V and a Frequency f is fed.
- the signal of the receiver electrode 13 is fed to the discriminator 19 via a bandpass filter 22.
- the discriminator 19 compares the obtained signal with a reference signal 23 and, as described above, discriminates whether the function of the electric power tool 1 should be released (step 24).
- the (audio frequency) exciter signal is first generated at a digital output of a microcontroller and this digital output is connected to the exciter electrode 12.
- the tapped at the receiver electrode 13 voltage level is then converted in a measuring amplifier (18) in its impedance.
- the impedance converter hides interference signals by a suitable frequency characteristic itself.
- the output signal of the measuring amplifier 18 is then digitized in an analog-to-digital converter and sampled frequency-synchronously to a multiple exciter frequency f.
- a numerical value is then calculated on the basis of the digitized measured values, which corresponds to the AC voltage level at the receiver electrode 13 at the frequency f.
- This voltage level can then be compared with a reference value (23).
- a multi-channel concept as shown for example in Figure 2, it is possible to gain information about the orientation of the user's hand, for example, to find out whether the user's hand, the electric hand tool 1 and the handle 14 completely encloses.
- the digital filtering in the microcontroller extracts several numerical values from the digitized voltage levels at the receiver electrode 13, which corresponds to the voltage amplitudes at the different excitation frequencies of the excitation electrode 12 (16, 17). This can be done numerically, for example by a Fourier transformation or alternatively by suitable digital FIR or IIR filters.
- the circuit thereby enables a plurality of comparison variables when using only a single measuring amplifier 18.
- the narrow-band spectral filtering is realized by a multi-stage analog amplifier for this purpose.
- the output of the AC voltage source 21 with a single nominal frequency f as the excitation signal it is also conceivable to connect an arbitrary waveform to the excitation electrode 12.
- a correlation filter in particular a digital correlation filter.
- FIGS. 4A and 4B show exemplary embodiments for operating the electric hand-held power tool 1 with the safety device 8.
- the safety device 8 serves only for unlocking the main switch 7 (or the electric motor 4) once, so that the capacitive switch 9 also remains is deactivated, the electric hand tool 1 can be used further.
- the capacitive switch 9 would have to be actuated again in order to use the electric hand tool 1.
- the main switch 7 is also configured as a capacitive switch 9, for example, to further increase the ease of use for the user.
- the shape and distribution of the dielectric sensor surfaces 10, 11 can be freely designed, but is preferably modeled on the anatomy of the human hand.
- the sensor regions 10, 11, as shown in Figure 1 formed as elongated sensor areas.
- At least one of the dielectric sensor regions may also be accommodated in a "mechanically" protected area so that it can not be easily activated or actuated, this being the case when the dielectric sensor region 10 or 11 is arranged in a recess of the housing, for example which shields the dielectric sensor area from "direct" access.
- the electric power tool 1 may also be designed as a drill, impact drill, saw or the like.
- the angle grinder 2 described here represents only one possible embodiment of the electric hand tool 1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007042221A DE102007042221A1 (de) | 2007-09-05 | 2007-09-05 | Elektrohandwerkzeugmaschine sowie Verfahren zum Betreiben einer Elektrohandwerkzeugmaschine |
PCT/EP2008/058746 WO2009030541A1 (de) | 2007-09-05 | 2008-07-07 | Elektrohandwerkzeugmaschine sowie verfahren zum betreiben einer elektrohandwerkzeugmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2200785A1 true EP2200785A1 (de) | 2010-06-30 |
EP2200785B1 EP2200785B1 (de) | 2016-09-07 |
Family
ID=39864868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08774820.8A Not-in-force EP2200785B1 (de) | 2007-09-05 | 2008-07-07 | Elektrohandwerkzeugmaschine sowie verfahren zum betreiben einer elektrohandwerkzeugmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2200785B1 (de) |
DE (1) | DE102007042221A1 (de) |
WO (1) | WO2009030541A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009016355B3 (de) * | 2009-04-07 | 2010-07-08 | Ident Technology Ag | Messelektrodenanordnung zur verbesserten Näherungsdetektion |
DE102009057931B4 (de) * | 2009-12-11 | 2015-07-09 | Ident Technology Ag | Schaltungsanordnung für ein kapazitives Sensorelement. |
DE102009057935B4 (de) * | 2009-12-11 | 2015-07-09 | Ident Technology Ag | Einrichtung und Verfahren zur Detektion eines Umgreifens eines Handgeräts durch eine Hand |
DE102009057933B3 (de) * | 2009-12-11 | 2011-02-24 | Ident Technology Ag | Sensoreinrichtung sowie Verfahren zur Annäherungs- und Berührungsdetektion |
DE102010043519B4 (de) * | 2010-11-05 | 2012-10-18 | Ident Technology Ag | Verfahren und Sensoreinrichtung zur Detektion eines Umgreifens eines Handgerätes |
DE102011006743B4 (de) * | 2011-04-04 | 2012-12-06 | Ident Technology Ag | Sensoreinrichtung und Verfahren zur Detektion eines Umgreifens eines Handgerätes |
DE102011075426B4 (de) | 2011-05-06 | 2024-02-01 | Siemens Healthcare Gmbh | Eingabeeinheit |
DE102011118613A1 (de) * | 2011-11-16 | 2013-05-16 | Wsengineering Gmbh & Co.Kg | Handgriff für ein motorisch angetriebenes Werkzeug sowie Verfahren zum Betrieb eines Totmannschalters |
EP3007197A1 (de) * | 2014-10-07 | 2016-04-13 | HILTI Aktiengesellschaft | Näherungs- oder Berührungssensor in einer Werkzeugmaschine |
DE102015214368A1 (de) * | 2014-12-09 | 2016-06-09 | Robert Bosch Gmbh | Werkzeugmaschinenbedienvorrichtung |
DE102015225723A1 (de) * | 2015-12-17 | 2017-06-22 | Robert Bosch Gmbh | Handwerkzeugmaschinenvorrichtung |
EP3316270A1 (de) * | 2016-10-27 | 2018-05-02 | HILTI Aktiengesellschaft | Schaltervorrichtung für werkzeugmaschine |
DE102020120197A1 (de) | 2020-07-30 | 2022-02-03 | Metabowerke Gmbh | Betätigungsschalter für eine Elektrowerkzeugmaschine, Verfahren zum Betreiben einer Elektrowerkzeugmaschine und Elektrowerkzeugmaschine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10219368A1 (de) * | 2002-04-30 | 2003-11-20 | Magenwirth Gmbh Co Gustav | Totmannvorrichtung |
DE10232934A1 (de) | 2002-07-19 | 2004-01-29 | Ident Technology Ag | Handgriffeinrichtung sowie Sicherheitsschaltungsanordnung insbesondere für ein kraftbetriebenes Werkzeug |
DE10302532A1 (de) * | 2003-01-23 | 2004-07-29 | Hilti Ag | Steuerung einer Handwerkzeugmaschine |
DE102004024035A1 (de) * | 2004-05-11 | 2005-12-08 | Schmid & Wezel Gmbh & Co | Griff für ein motorangetriebenes Handwerkzeug |
-
2007
- 2007-09-05 DE DE102007042221A patent/DE102007042221A1/de not_active Withdrawn
-
2008
- 2008-07-07 EP EP08774820.8A patent/EP2200785B1/de not_active Not-in-force
- 2008-07-07 WO PCT/EP2008/058746 patent/WO2009030541A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009030541A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102007042221A1 (de) | 2009-03-12 |
WO2009030541A1 (de) | 2009-03-12 |
EP2200785B1 (de) | 2016-09-07 |
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