EP0348679A2 - Résistance ajustable, en particulier pour des interrupteurs manuels d'outils électriques - Google Patents

Résistance ajustable, en particulier pour des interrupteurs manuels d'outils électriques Download PDF

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Publication number
EP0348679A2
EP0348679A2 EP89109900A EP89109900A EP0348679A2 EP 0348679 A2 EP0348679 A2 EP 0348679A2 EP 89109900 A EP89109900 A EP 89109900A EP 89109900 A EP89109900 A EP 89109900A EP 0348679 A2 EP0348679 A2 EP 0348679A2
Authority
EP
European Patent Office
Prior art keywords
resistance
resistor according
contact
longitudinal direction
track arrangement
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Withdrawn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
EP89109900A
Other languages
German (de)
English (en)
Other versions
EP0348679A3 (fr
Inventor
Heinrich Zeitvogel
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.)
Aumovio Microelectronic GmbH
Original Assignee
Telefunken Electronic GmbH
Temic Telefunken Microelectronic GmbH
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 Telefunken Electronic GmbH, Temic Telefunken Microelectronic GmbH filed Critical Telefunken Electronic GmbH
Publication of EP0348679A2 publication Critical patent/EP0348679A2/fr
Publication of EP0348679A3 publication Critical patent/EP0348679A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/305—Adjustable resistors the contact sliding along resistive element consisting of a thick film
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means
    • 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

Definitions

  • the invention relates to an adjustable resistor according to the preamble of the first claim.
  • a simple resistance path is provided on a further substrate carrying electrical components, which runs in the longitudinal direction parallel to a slide on which one on the resistance path sliding counter contact is fixed.
  • the slide is also connected to a switch which is in the circuit of the electrical control arrangement and is mechanically connected to a manually operated push button.
  • a switch which is in the circuit of the electrical control arrangement and is mechanically connected to a manually operated push button.
  • a stop slide is assigned, which is moved by turning the adjusting wheel in the axial direction of the slide and thus limits the displacement of the slide and thus the counter contact in the manner of an adjusting device.
  • the mating contact simultaneously slides on a conductor track running parallel to the resistance track.
  • the resistance value tapped at the resistance track which influences, for example, the speed of a drive motor controlled by the control circuit, is solely dependent on the sliding path of the slide and thus the Position of the counter contact in the longitudinal direction of the resistance track.
  • the displacement of the slide depends on the position of the adjusting device and is limited to a relatively small path of the total displacement, if only correspondingly low speeds are to be achieved with the slide pushed in as far as it will go. Intermediate values of the resistance value or the speed can therefore only be set within the correspondingly shortened total sliding distance.
  • the invention has for its object to provide an adjustable resistor according to the preamble of the first claim, which can be adjusted independently of a preselected resistance value over the entire available displacement path of the counter-contact.
  • the entire displacement path provided for the counter contact is retained over the entire active length of the resistance track arrangement in all settings of the adjusting device, because the counter contact is additionally adjusted transversely to the longitudinal direction of the resistance track arrangement and the effective resistance value is changed over the entire adjustment path becomes.
  • the resistance path only needs to be contacted in the area of one end on a longitudinal edge, so that when the countercontact is shifted at least the effective basic resistance value is changed, and in addition, with a homogeneous remaining resistance surface, the normal increase in resistance is added via the adjustment path.
  • the resistance track arrangement preferably has zones of different electrical conductivity transverse to its longitudinal direction, so that depending on the selected resistance track, different resistance characteristics result over the displacement path in the longitudinal direction.
  • the individual resistance tracks can be separated from each other by insulating gaps or they can also connect directly to one another in the transverse direction without gaps.
  • the counter contact has a width transverse to the longitudinal direction of the resistance tracks on, which is not larger than the width of a resistance track, then the resistance tracks are made of material of different conductivity.
  • the mating contact is so wide that it can overlap all resistance tracks of the resistance track arrangement transversely to the longitudinal direction, then the resistance tracks or zones can have the same resistance characteristics, since the resistance tracks are scanned in parallel depending on the adjustment path in the transverse direction and the total resistance value thus changes.
  • the resistance tracks which are separated from one another in the longitudinal direction it is also possible to contact the tracks at one end separately if different control parameters, such as speed, torque or the like, are to be influenced via individual tracks.
  • the resistance track arrangement can be applied to both a flat and a cylindrical substrate, with the resistance tracks in the case of a cylindrical arrangement being able to extend parallel to one another in the axial direction if the counter-contact for transverse adjustment is arranged to be movable in the circumferential direction. If, on the other hand, the resistance tracks are arranged running in the circumferential direction, then the mating contact need only be mounted so as to be displaceable in the axial direction of the cylinder.
  • the mating contact can preferably be brought into traversable latching positions via its transverse adjustment path, so that, in particular in the case of resistance paths insulated from one another in the longitudinal direction, the contracting of assigned specific resistance paths is ensured. In addition, there is no change in the set value when the slide or counter contact is axially locked.
  • a substrate 2 In a switch housing 1 of a hand switch for a power tool with integrated electronic speed control and electrical switch contacts (not shown) there is a substrate 2, preferably with resistance tracks applied in parallel with one another and possibly separated in the longitudinal direction by an insulating space 3 in the longitudinal direction.
  • the resistance tracks 4 are connected to each other at one of the longitudinal ends via a conductor track 5 with low resistance or via a resistance band, which simultaneously form an external connection 6.
  • a sliding track 7 extends parallel to the resistance tracks 4 of the resistor arrangement and, like the conductor track 5, may consist of a conductive silver imprint or else of a resistance material.
  • the grinding track 7 is provided with a further outer connection 8.
  • a mating contact 9 designed as a sliding contact is provided, which on the one hand rests on the sliding track 7 and on the other hand can optionally be brought into contact with the resistance tracks 4.
  • the mating contact 9 is assigned to a slide 10 which is displaceable parallel to the longitudinal direction of the resistance tracks 4 and coupled to the mating contact 9 such that the mating contact 9 is not axially adjustable thereon, but is transverse to the longitudinal direction of the resistance tracks 4 or the sliding direction.
  • the pusher 12 is used for manual actuation of the slide 10, which not only actuates the counter contact 9 but also the electrical contacts already mentioned.
  • the Actuator 11 can be designed as a sliding piece, which is slidably mounted transversely to the longitudinal direction of the resistance track 4 and can be coupled directly to the mating contact 9. However, if the actuator 11 is rotatably mounted in the pusher 12 as a setting wheel, then a geared connection, not shown, is required between the setting wheel 11 and the mating contact 9 if the substrate 2 is flat. In the case of a cylindrical configuration of the substrate 2 and the slide 10, as shown in FIG. 2, the mating contact 9 can be connected in a rotationally fixed manner to the adjusting wheel 11, so that the slide 10 can be adjusted both axially and radially.
  • the sliding track 7 is adapted in width to the transverse adjustment path of the counter contact 9.
  • the counter contact 9 is so wide in the transverse direction that it is still in contact with the sliding track 7 even when contacting the respectively external resistance track 4.
  • the sliding track 7 in the axial extension of the resistance tracks 4 if the mating contact 9 has a length which extends from this sliding track to the opposite end of the respective resistance track 4.
  • the comb-like resistance tracks 4 can also be combined with comb-like interspersed, electrically isolated sliding tracks, in which case the mating contact 9 connects at least one of the resistance tracks 4 to at least one of the sliding tracks.
  • the counter-contact 9 is also possible to design the counter-contact 9 as a helical spring which extends transversely to the longitudinal direction of the resistance tracks 4 and rests over its entire axial length on the substrate 2 or the respective sliding track 7 and at least one of the resistance tracks 4 depending on the position of the actuator 11 .
  • the helical spring 9 is particularly suitable in the case of a cylindrical substrate 2, because it then automatically adjoins the circumference of the substrate 2 with appropriate support without special adjustment measures, as shown in FIG. 2.
  • the resistance track arrangement 4 can also run in the longitudinal direction along the surface lines of a cylinder shell. Then the mating contact can be rotated concentrically to the cylinder jacket and is additionally displaceable in its axial direction. By rotating the counter contact, one or more of the tracks of the resistance track arrangement can thus be scanned in the longitudinal direction, while by axially shifting the counter contact depending on the insertion depth and design of the counter contact (point or line, at least over the length of the transverse shift path), the number of resistance tracks to be covered is changed .
  • the resistance track arrangement 4 according to FIG. 3 can consist of a homogeneous resistance layer which extends not only in the longitudinal direction indicated by the dash-dotted line 13 but also transversely to it to a considerable extent.
  • the contacting of the resistor track arrangement 4 with a low-resistance conductor track 5 is limited only to an immediate corner area of the resistor area and does not extend over an entire longitudinal side edge. If the counter contact 9 is in the immediate vicinity of the short conductor track 5, the resistance value tapped between the outer connections 6 and 8 has its lowest value. This value increases with a parallel displacement to the longitudinal direction 13. If the mating contact 9 is moved to a position lying away from the conductor track 5 as shown in FIG.
  • the resistance value has an initial value which is the distance between the conductor track 5 and the counter contact 9 corresponds. This initial value is increased by adjusting the counter contact 9 parallel to the longitudinal direction 13. In this case, even with a homogeneous design of the resistance track arrangement 4, depending on the transverse adjustment of the counter-contact 9, a different final value is reached when the counter-contact 9 is adjusted in the longitudinal direction 13.
  • the resistance track arrangement is preferably transverse to its longitudinal direction 13 with zones 14 different electrical conductivity.
  • the insulating intermediate space 3 is provided as a zone of low conductivity between individual resistance tracks 4 which extend in the longitudinal direction.
  • the zones of high conductivity with resistance coating alternate with insulating zones of low conductivity.
  • the individual resistance tracks 4 can have different conductivities from one another, that is to say they consist of materials of different specific resistance values or, in particular, logarithmically change their conductivity in the longitudinal direction.
  • the zones 3 of low conductivity can be created by laser scribing, whereby an arbitrarily fine division of the resistance track arrangement is achieved.
  • the conductor track 5 then extends in the transverse direction across all zones 14 in analogy to the embodiment according to FIGS. 1 and 2 or is only limited to a corner area according to FIG. 3.
  • the mating contact can also be formed in a punctiform or linear manner, so that either only one of the zones is scanned when the mating contact 9 is adjusted in the longitudinal direction 13, or several zones are scanned parallel to one another.
  • the sliding track or the resistance band 7 can generally be provided at the end of the resistance track arrangement 4, which is adjacent to the starting position of the mating contact 9, that is to say prior to its manual adjustment.
  • a conductive film preferably being arranged at a distance above the conductor track arrangement and acting as a counter-contact which, by pressing on a finger-like slide, only applies the film provided with the counter-contact to the area of the slide in the area of the slide underlying zone of resistance track 4 presses.
  • the film isolates the counter contact from external access.
  • the slider can be arranged mechanically lengthways and transversely adjustable by the adjusting device.
  • the slideway 7 is constructed from individual slideways 7.1 running parallel in the resistance tracks 4, so that each resistive track 4 is assigned an individual slideway 7.1.
  • the mating contact 9 engages in each case from a single sliding track 7.1 to the associated resistance track 4 and is detachably latched against a transverse adjustment relative to the longitudinal device 13 via a multi-stage catch.
  • the cylindrical embodiment according to FIG. 2 can be realized particularly easily if the cylindrical substrate 2 is hollow, in a modification of the embodiment shown, and carries the elements 3 to 8 on the inner surface.
  • the possibly cylindrical slide 10 can then be inserted into the cavity and carry the mating contact 9 on its outer surface.
  • the slider 10 can then be adjusted in a simple manner axially by means of the pusher 12 and radially by means of the actuator 11 in order to scan the resistance tracks 4 in the longitudinal direction and to be able to switch on optionally in the circumferential direction if required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
EP19890109900 1988-06-25 1989-06-01 Résistance ajustable, en particulier pour des interrupteurs manuels d'outils électriques Withdrawn EP0348679A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3821562 1988-06-25
DE3821562A DE3821562C1 (fr) 1988-06-25 1988-06-25

Publications (2)

Publication Number Publication Date
EP0348679A2 true EP0348679A2 (fr) 1990-01-03
EP0348679A3 EP0348679A3 (fr) 1991-10-16

Family

ID=6357296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890109900 Withdrawn EP0348679A3 (fr) 1988-06-25 1989-06-01 Résistance ajustable, en particulier pour des interrupteurs manuels d'outils électriques

Country Status (4)

Country Link
US (1) US4978939A (fr)
EP (1) EP0348679A3 (fr)
JP (1) JPH0251202A (fr)
DE (1) DE3821562C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4484070A1 (fr) * 2023-06-15 2025-01-01 Black & Decker Inc. Module witch à vitesse variable ayant un pavé de détection discret marche/arrêt

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5334967A (en) * 1993-06-29 1994-08-02 Illinois Tool Works Inc. Voltage divider
US5488349A (en) * 1993-12-02 1996-01-30 Erickson; Bruce L. Multiple range variable resistor
DE4410312C2 (de) * 1994-03-25 2000-01-13 Bosch Gmbh Robert Elektrische Handwerkzeugmaschine mit Potentiometer und Verfahren zum Einstellen des Potentiometers
GB2314980B (en) * 1996-07-02 2000-06-28 Defond Mfg Ltd Power tool speed controller
FR2829522B1 (fr) * 2001-09-07 2003-11-21 Siemens Automotive Sa Systeme de commande de leve vitre
US6774509B2 (en) * 2002-01-30 2004-08-10 Defond Manufacturing Limited Electrical switch assembly
CN105185494B (zh) * 2014-06-19 2018-03-06 国网山西省电力公司电力科学研究院 一种组合式微机变阻器的电阻调节方法
JP6854302B2 (ja) * 2018-01-10 2021-04-07 ディーフォン エレクテック カンパニー リミテッドＤｅｆｏｎｄ Ｅｌｅｃｔｅｃｈ Ｃｏ．， Ｌｔｄ 電気的デバイスの可変速コントローラと共に使用する電気的スイッチモジュール
CN209390034U (zh) * 2019-01-23 2019-09-13 惠州拓邦电气技术有限公司 一种电子开关模块及电动工具

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US1938396A (en) * 1929-12-16 1933-12-05 Allen Bradley Co Electrical resistor
DE652202C (de) * 1934-07-01 1937-10-27 Siemens & Halske Akt Ges Potentiometer mit auf einer isolierenden Unterlage aufgetragener Widerstandsschicht
US3156888A (en) * 1963-03-01 1964-11-10 Weston Instruments Inc Adjustable potentiometer
US3535670A (en) * 1968-05-02 1970-10-20 Spectrol Electronics Corp Contact member for a variable resistor
US3599141A (en) * 1969-07-07 1971-08-10 Spectrol Electronics Corp Variable resistor having means for sealing between a lead screw and the housing
US3663755A (en) * 1970-04-23 1972-05-16 Motorola Inc Variable resistance control device
US3648217A (en) * 1970-05-06 1972-03-07 Spectrol Electronics Corp Potentiometer equipped with positive positioning means
US4097704A (en) * 1976-08-02 1978-06-27 Cutler-Hammer, Inc. Industrial reversing speed control trigger switch with snap-in modules
US4345235A (en) * 1980-09-12 1982-08-17 Spectrol Electronics Corporation Variable resistance device having a resistance element with laser cuts
DE3631057A1 (de) * 1986-09-12 1988-03-24 Preh Elektro Feinmechanik Verfahren zur herstellung nichtlinearer widerstandsbahnen und nach diesem verfahren hergestelltes drehpotentiometer
DE8802883U1 (de) * 1988-03-04 1988-04-21 Preh, Elektrofeinmechanische Werke Jakob Preh Nachf. Gmbh & Co, 8740 Bad Neustadt Drehpotentiometer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4484070A1 (fr) * 2023-06-15 2025-01-01 Black & Decker Inc. Module witch à vitesse variable ayant un pavé de détection discret marche/arrêt
US12490378B2 (en) 2023-06-15 2025-12-02 Black & Decker Inc. Variable-speed switch module having a discrete on/off detection pad

Also Published As

Publication number Publication date
EP0348679A3 (fr) 1991-10-16
US4978939A (en) 1990-12-18
JPH0251202A (ja) 1990-02-21
DE3821562C1 (fr) 1990-02-08

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