EP3007196A1 - Montage alternatif de commutateur à base de matériaux synthétiques résistifs, asservis à la pression - Google Patents

Montage alternatif de commutateur à base de matériaux synthétiques résistifs, asservis à la pression Download PDF

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Publication number
EP3007196A1
EP3007196A1 EP14187855.3A EP14187855A EP3007196A1 EP 3007196 A1 EP3007196 A1 EP 3007196A1 EP 14187855 A EP14187855 A EP 14187855A EP 3007196 A1 EP3007196 A1 EP 3007196A1
Authority
EP
European Patent Office
Prior art keywords
state
conductive polymer
electric motor
machine tool
pressure
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.)
Withdrawn
Application number
EP14187855.3A
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German (de)
English (en)
Inventor
Dominik Bahr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP14187855.3A priority Critical patent/EP3007196A1/fr
Publication of EP3007196A1 publication Critical patent/EP3007196A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01H9/061—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 enclosing a continuously variable impedance
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H2003/0293—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch with an integrated touch switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/032—Conductive polymer; Rubber

Definitions

  • the present invention relates to a machine tool comprising an electric motor and a switching device which is reversibly adjustable in a first state and in a second state, wherein in the first state, the electric motor in a standby mode and in the second state of the electric motor in a Operating mode is located.
  • Machine tools usually have a switch with which the electric motor can be actuated in the interior of the machine tool.
  • Such switches are often designed on modern machine tools in the form of a potentiometer (also referred to as a potentiometer or potentiometer switch).
  • a potentiometer is essentially an electrical resistance component whose resistance values can be changed mechanically (by rotation or displacement). It has at least two connections and is mainly used as a continuously adjustable voltage divider.
  • the voltage divider in turn consists of an electrically non-conductive support on which a resistance material is applied, two terminals at the two ends of the resistive element and a movable sliding contact (also referred to as a grinder), which divides the solid total resistance electrically into two opposite partial resistances.
  • a switch designed as a mechanical potentiometer may have some problems. Because of the abrasion of the resistance material, mechanical potentiometers do not work wear-free due to the movable sliding contact (wiper). This wear can lead both to a faulty function as well as to a failure of the switch or to a failure of the entire machine tool. In particular, the problem is compounded by the fact that the switch on machine tools is subject to heavy stress due to frequent actuation.
  • the object of the present invention is therefore to solve the above-mentioned problems and in particular to provide a machine tool on which a wear of the switch as possible reduced and the functionality of the switch or the entire machine tool is improved.
  • a machine tool including an electric motor and a switching device reversibly adjustable to a first state and a second state, wherein in the first state the electric motor is in a standby mode and in the second state the electric motor is in an operating mode.
  • the switching device has at least one first surface element, wherein the surface element at least partially contains a conductive polymer which is reversibly changeable by exerting a pressure from an electrically non-conductive state to an electrically conductive state. Without mechanical signs of wear, by applying a certain pressure to the conductive polymer, conductivity can be generated, thereby shifting the switching device from the first state to the second state.
  • an electrical resistance of the conductive polymer in accordance with the pressure applied to the conductive polymer, thereby increasing a rotational speed of the electric motor corresponding to a ratio of the reduced electrical resistance of the conductive polymer.
  • the conductive polymer has at least partially a quantum tunneling effect.
  • a control device which detects the electrical resistance of the conductive polymer and compares with at least a first threshold value and a second threshold value, wherein the switching device from the first state to the second state is set when the electrical resistance of the conductive polymer exceeds the first threshold, and wherein the switching device is set from the second state to the first state, when the electrical resistance of the conductive polymer exceeds the second threshold.
  • the switching device is only changed to the second state when sufficient pressure is exerted on the conductive polymer.
  • the machine tool 1 essentially comprises a housing 2, an electric motor 3, a transmission, an output shaft, a tool 4, a control device 5, a switching device 6 and a power supply 7.
  • the transmission and the output shaft are not shown in the figures.
  • the housing 2 includes a front end 2a, a rear end 2b, a left side 2c, and a right side 2d.
  • the housing 2 has a first grip area 8.
  • the first grip portion 8 is positioned substantially in the vicinity of the rear end 2b of the housing 2.
  • a second grip portion 9 is provided in the vicinity of the front end 2a and on the left side 2c of the housing 2.
  • the second grip area 9 is designed in the form of an additional handle.
  • the auxiliary handle 9 includes a first end 9a and a second end 9b.
  • an external thread not shown
  • an external thread not shown
  • auxiliary handle 9 Through the screw connection designed as an additional handle second handle portion 9 is detachably connected to the housing 2.
  • first end 9a of the auxiliary handle 9 is also a first electrical contact and on the left side 2c of the housing 2, a second electrical contact is provided.
  • the auxiliary handle 9 with the external thread is screwed into the internal thread of the housing 2, the first electrical contact and the second electrical contact are connected to one another in such a way that electrical current and / or data can be exchanged between the two electrical contacts.
  • the external thread, the internal thread, the first electrical contact and the second electrical contact are shown. With the aid of the first grip area 8 and the second grip area 9, the machine tool 1 can be held and operated by a user (not shown).
  • a power supply 10 in the form of a power cable for connecting the machine tool 1 to a power source 11 is provided at the rear end 2b of the housing 2.
  • the power source 11 is a socket of a mains power system (see. Fig. 2 ).
  • the energy source 11 may also be designed in the form of a rechargeable battery, which with the housing 2 of the machine tool 1 is connectable.
  • the power source 11 ensures a constant supply of the control device 5 with electric current.
  • the electric motor 3 In the interior of the housing 2 of the machine tool 1, the electric motor 3 is positioned. A torque generated in the electric motor 3 is transmitted to the transmission, which in turn transmits a torque to the output shaft. From the output shaft, the torque is transmitted to the tool 4.
  • the tool 4 As in Fig. 1 and 2 shown, the tool 4 is designed in the form of a grinding wheel. However, the tool 4 may also be a cutting disk. In the figures, the transmission and the output shaft are not shown. If the machine tool 1 is a different tool 4 than an angle grinder, the tool 4 is designed in accordance with the associated machine tool 1.
  • the first grip region 8 includes a first surface element 12 and the second grip region 9 includes a second surface element 13.
  • the first surface element 12 and the second surface element 13 essentially form the switching device 6 Fig. 2 schematically illustrated, the first surface element 12 and the second surface element 13 is connected to the control device 5 in connection. Like also in Fig. 2 shown schematically, the control device 5 is connected to the electric motor 3. As described in detail below, both the first surface element 12 and the second surface element 13 each contain an electrically conductive polymer 20.
  • Fig. 3 shows a schematic representation of the arrangement or the connection of the electric motor 3, the first surface element 12, the second surface element 13, the control device 5 and the power supply 10 to each other.
  • the first surface element 12 includes a first contact 12a and a second contact 12b.
  • the second surface element 13 has a first contact 13a and a second contact 13b.
  • the power supply 10 is connected via a first line 14 to the control device 5.
  • the first line 14 represents the power cable 10 designed as a power cable.
  • the control device 5 is supplied with an electrical voltage.
  • the control device 5 is connected via a second line 15 to the electric motor 3. Via the second line 15, an electrical voltage is transmitted from the control device 5 to the electric motor 3.
  • a third line 16 connects the first contact 12a of the first area element 12 with the control device 5.
  • a fourth line 17 connects the second contact 12b of the first area element 12 with the control device 5.
  • a fifth line 18 connects the first contact 13a of the second area element 13 with the control device 5.
  • a sixth line 19 connects the second contact 13b of the second area element 13 with the control device 5.
  • the third, fourth, fifth and sixth lines 16, 17, 18, 19 serve to allow a measuring current to flow from the control device 5 through the first and second surface elements 12, 13, respectively. The measuring current is in turn used to detect or measure the electrical resistance or a change in the electrical resistance at the conductive polymer 20 of the first and second surface elements 12, 13.
  • both the first surface element 12 and the second surface element 13 contain an electrically conductive polymer 20.
  • the conductive polymer 20 is in each case positioned in the first and second surface element 12, 13 such that the conductive polymer 20 in each case first contact 12a, 13a connects to the second contact 12b, 13b.
  • the conductive polymer 20 is configured to be reversibly changed by applying a pressure from a non-conductive state to a conductive state.
  • the conductive polymer 20 has a quantum tunneling effect.
  • the conductive polymer 20 is also known as Quantum Tunneling Composite (QTC).
  • QTC Quantum Tunneling Composite
  • the electrically conductive particles of the polymer 20 are too far apart from each other as being an electric current through the polymer 20 and to be able to conduct from the first contact 12a, 13a to the second contact 12b, 13b.
  • the polymer 20 is thus not electrically conductive.
  • the electrically conductive particles of the polymer 20 are redesigned to provide an electrical current through the polymer 20 and thus from the first contact 12a, 13a to the second contact 12b, 13b can guide.
  • the conductive polymer 20 Quantum Tunneling Composite
  • the conductivity of the conductive polymer 20 is increased by the pressure exerted or the electrical resistance of the conductive polymer 20 is reduced.
  • the control device 5 can detect the reduction of the electrical resistance or the increase in the conductivity of the conductive polymer 20 on the basis of the pressure exerted. In the control device 5, the detected or measured resistance is compared with stored threshold values.
  • the detected resistance exceeds a certain threshold, a corresponding amount of current is supplied to the electric motor 3 to operate it. Similarly, the amount of current to the electric motor 3 is increased as the pressure on the surface elements 12, 13 increases and, as a result, the electrical resistance in the conductive polymer 20 is reduced. Similarly, the amount of current to the electric motor 3 is reduced when the pressure on the surface elements 12, 13 decreases and as a result, the electrical resistance in the conductive polymer 20 increases.
  • the electric current or the amount of current flowing from the power supply via the control device 5 to the electric motor 3 can be regulated efficiently.
  • the amount of current consequently also the power output (speed and torque) of the electric motor 3 can be varied.
  • the surface elements 12, 13 are configured with the conductive polymer 20 (Quantum Tunneling Composite) as a kind of switch, in which no current is sent to the electric motor 3 without correspondingly exerted pressure.
  • the surface elements 12, 13 function as a variable resistive element, indirectly regulating the amount of current sent to the electric motor 3 (see FIG. Fig. 5 ).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lubricants (AREA)
EP14187855.3A 2014-10-07 2014-10-07 Montage alternatif de commutateur à base de matériaux synthétiques résistifs, asservis à la pression Withdrawn EP3007196A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14187855.3A EP3007196A1 (fr) 2014-10-07 2014-10-07 Montage alternatif de commutateur à base de matériaux synthétiques résistifs, asservis à la pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14187855.3A EP3007196A1 (fr) 2014-10-07 2014-10-07 Montage alternatif de commutateur à base de matériaux synthétiques résistifs, asservis à la pression

Publications (1)

Publication Number Publication Date
EP3007196A1 true EP3007196A1 (fr) 2016-04-13

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Family Applications (1)

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EP14187855.3A Withdrawn EP3007196A1 (fr) 2014-10-07 2014-10-07 Montage alternatif de commutateur à base de matériaux synthétiques résistifs, asservis à la pression

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3879550A1 (fr) * 2016-09-29 2021-09-15 Schaefer GmbH Unité de commutation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030151589A1 (en) * 2002-02-13 2003-08-14 Siemens Technology-To-Business Center, Llc Configurable industrial input devices that use electrically conductive elastomer
US20130307799A1 (en) * 2012-05-16 2013-11-21 Siemens Aktiengesellschaft Touchscreen with analog pressure detection as user interface for industrial technical device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030151589A1 (en) * 2002-02-13 2003-08-14 Siemens Technology-To-Business Center, Llc Configurable industrial input devices that use electrically conductive elastomer
US20130307799A1 (en) * 2012-05-16 2013-11-21 Siemens Aktiengesellschaft Touchscreen with analog pressure detection as user interface for industrial technical device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DAVID SAVASTANO: "Globalpowerbrands' New Electric Drill Utilizes Peratech's QTC?Materials", 7 November 2013 (2013-11-07), XP055175555, Retrieved from the Internet <URL:http://www.inkworldmagazine.com/contents/view_online-exclusives/2013-11-07/globalpowerbrands-new-electric-drill-utilizes-peratechs-qtcmaterials/> [retrieved on 20150311] *
PERATECH LIMITED: "www.peratech.com | Tools & Industrial", 27 November 2013 (2013-11-27), XP055175719, Retrieved from the Internet <URL:https://web.archive.org/web/20131127044037/http://peratech.com/tools-and-industrial.html> [retrieved on 20150311] *
PERATECH: "Printable pressure switches used for variable speed control in new electric drill design", 22 October 2013 (2013-10-22), XP055175545, Retrieved from the Internet <URL:http://www.designfax.net/cms/dfx/opens/article-view-dfx.php?nid=4&bid=288&et=featurearticle&pn=01> [retrieved on 20150311] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3879550A1 (fr) * 2016-09-29 2021-09-15 Schaefer GmbH Unité de commutation

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