EP0264570B1 - Potentiometer - Google Patents

Potentiometer Download PDF

Info

Publication number
EP0264570B1
EP0264570B1 EP87111985A EP87111985A EP0264570B1 EP 0264570 B1 EP0264570 B1 EP 0264570B1 EP 87111985 A EP87111985 A EP 87111985A EP 87111985 A EP87111985 A EP 87111985A EP 0264570 B1 EP0264570 B1 EP 0264570B1
Authority
EP
European Patent Office
Prior art keywords
spring
contact surface
tongue
brush spring
potentiometer according
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.)
Expired - Lifetime
Application number
EP87111985A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0264570A3 (en
EP0264570A2 (de
Inventor
Reinhard Hochholzer
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.)
Wilhelm Ruf KG
Original Assignee
Wilhelm Ruf KG
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 Wilhelm Ruf KG filed Critical Wilhelm Ruf KG
Publication of EP0264570A2 publication Critical patent/EP0264570A2/de
Publication of EP0264570A3 publication Critical patent/EP0264570A3/de
Application granted granted Critical
Publication of EP0264570B1 publication Critical patent/EP0264570B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/12—Arrangements of current collectors

Definitions

  • the invention relates to a potentiometer according to the preamble of claim 1.
  • a potentiometer is known from DE 24 06 291-A1.
  • a wiper spring with two spring arms bent in plan view is held on a spring support.
  • the spring support has a contact surface that runs obliquely to the resistance plate, on which the spring arms rest, and an exciting abutment at the rear end of the wiper spring, which prevents this end from being lifted off the contact surface.
  • the wiper spring is riveted to the spring carrier there.
  • EP 0 158 191 A3 describes a potentiometer whose wiper spring also has an essentially rectilinear shape.
  • the spring support on which the The wiper is riveted has a contact surface that runs diagonally to the resistance plate.
  • the pretension with which the wiper spring is pressed against the resistance track comes from a second compression spring, also attached to the spring support, which presses the wiper spring against the resistance track.
  • the object of the invention is to improve the potentiometer of the type mentioned in such a way that the contact pressure of the wiper spring relative to the resistance layer can be determined very precisely with little technical effort, in particular little assembly effort.
  • the basic idea of the invention is that the straight and in a defined slope to the spring support arranged wiper spring is clamped and supported on the contact-side, front end of the contact surface with lateral tongues on lateral posts.
  • the invention also has the following advantages: the assembly costs (time and parts costs) are low, since the wiper spring only has to be inserted into the spring support, but riveting, screwing etc. is omitted; no additional components are required to fasten the spring; when mounting or fastening the wiper spring on the spring support, practically no forces have to be applied which could deform the wiper spring; the spring force no longer has to be readjusted; the pressure force is maintained within very narrow tolerances; after the preassembly, the wiper spring is captively clamped on the spring support; finally, the wiper spring is held in a precisely defined position on the spring support.
  • the resistance plate that is naturally present in the potentiometer, the housing, rotary actuators and electrical connections are omitted in the drawing. It is readily possible for the person skilled in the art to adapt these parts to the invention according to known models.
  • Fig. 1 shows a cross section of a spring support 1 with inserted grinder spring 2, which has grinder brushes 3 at its front, free end.
  • these wiper brushes 3 are in sliding electrical contact with a resistance layer of a resistance plate.
  • the wiper spring 2 is now straight overall. In order to be able to apply a defined pressure force to the resistance layer, the spring must of course be slightly bent when the potentiometer is fully assembled, but only in the elastic or Hook area of the wiper spring.
  • the spring support 1 has a contact surface 4 which runs obliquely to the resistance plate and against which a part (rear section) of the wiper spring rests.
  • the slope (angle) of this contact surface is precisely defined, so that the contact pressure between the wiper spring and the resistance layer can be precisely predefined with the angle, the length of the wiper spring 2 and the vertical distance between the spring support and the resistance plate, and finally the material properties (spring characteristic) of the wiper spring. so that "readjustment" is unnecessary.
  • the wiper spring does not lift off the spring support when its front end touches the resistance plate at its rear end, its rear end is supported in an abutment of the spring support.
  • This abutment is formed by a recess 5 which directly adjoins the contact surface 4 and whose wall 6 facing the upper side of the wiper spring is also inclined at an angle.
  • the distance between the two planes in which the contact surface 4 and the wall 6 lie is equal to the material thickness or the thickness of the wiper spring 2.
  • the wiper spring is thus clamped on two precisely defined lines, namely on the one hand the front edge 7 of the contact surface 4 and on the front edge 8 of the wall 6, even if the wiper spring lifts off from the contact surface 4 in the event of deformation due to the pressing force of the resistance plate.
  • the spring support of FIG. 1 has defined stop faces on both sides next to the recess 5, which are aligned with the edge 8.
  • the wiper spring has two rear arms 10, the rear-facing edges 11 of which are supported on the spring support.
  • upwardly bent tongues 12 are provided on the forward-facing end of the two arms 10, which are supported on upwardly projecting posts 13, specifically on their rear-facing wall 14 Wall 14 is inclined towards tongue 12, its angle relative to the contact surface is thus less than 90 °.
  • the posts 13 are on both sides next to the contact surface arranged opposite to the two tongues 12 of the wiper spring 4.
  • the tongue is curved approximately in a circular manner, its curved part resting against the wall 14. Due to the inclination of the wall 14, the tongue can "snap” and a resultant force acts on the wiper spring, which presses the wiper spring downwards against the contact surface and to the rear. Since the curved part of the tongue 12 lies against the wall 14, the wiper spring can also be easily removed upwards.
  • the embodiment of FIG. 3 differs from this in that the tongue 12 'is shorter and thus abuts the wall 14 with its upper edge. Since this upper edge is relatively sharp, there is a "clawing", i.e. the upper edge digs a little into the plastic material, so that it is not possible to simply remove the wiper spring. Rather, one would have to bend the tongue 12 'up slightly with a tool. Otherwise, embodiment 3 corresponds to that of FIG. 1.
  • the wiper spring has two arms 16 and 17, which are parallel to each other run at a distance.
  • recesses 5 'and 5'' are then provided analogously to the exemplary embodiment of FIGS. 1 and 3, into which the sections 9' and 9 '' protrude.
  • a central post 13 can be provided, which lies between the two arms 16 and 17, so that only one tongue 12 is required.
  • posts on both sides of the arms 16 and 17, that is to say additionally the posts 13 'and 13'', in which case the spring support also has correspondingly bent tongues there, which are not shown in FIG. 4.
  • FIG. 4 shows a section along the line CD of FIG. 5 and vice versa that FIG. 5 is a section along the line AB of FIG. 4. From Fig. 5 it can finally be seen that the tongue 12 can also be straight, so that the "clawing" of its front edge on the post is even more pronounced. This can be seen particularly well in FIG. 5.
  • FIGS. 6 and 7 differs from that of FIGS. 4 and 5 essentially in that the post 13 no longer protrudes beyond the upper edge of the spring support 1, but rather is flush with it and in that the tongue 12 goes down into the recess 15 of the spring support protrudes and is supported there on the slope 14 of the "post" 13.
  • the edge 7 of the post 13 can then also extend over the full width of the spring support, so that the spring arms 16 and 17 are also supported on it, in addition to being supported on the contact surface 4.
  • FIGS. 6 and 7 Another difference of FIGS. 6 and 7 compared to the embodiment of FIGS. 4 and 5 also lies in the rear abutment for the spring. This is designed in such a way that the opening 5 (FIG. 6) is covered by projecting sections 17, again with a wall of the section 17 pointing downward lying parallel to the bearing surface 4.
  • the projecting section 17 is also equipped with a bevel 16 which is at an acute angle to the direction of the spring.
  • the spring no longer has tabs projecting to the rear on its base body but a continuous straight edge 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
EP87111985A 1986-08-27 1987-08-18 Potentiometer Expired - Lifetime EP0264570B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3629002 1986-08-27
DE19863629002 DE3629002A1 (de) 1986-08-27 1986-08-27 Potentiometer

Publications (3)

Publication Number Publication Date
EP0264570A2 EP0264570A2 (de) 1988-04-27
EP0264570A3 EP0264570A3 (en) 1989-11-15
EP0264570B1 true EP0264570B1 (de) 1993-04-21

Family

ID=6308219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111985A Expired - Lifetime EP0264570B1 (de) 1986-08-27 1987-08-18 Potentiometer

Country Status (3)

Country Link
US (1) US4845461A (enrdf_load_stackoverflow)
EP (1) EP0264570B1 (enrdf_load_stackoverflow)
DE (2) DE3629002A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4115011A1 (de) * 1991-05-08 1992-11-12 Bosch Gmbh Robert Schleifer fuer ein elektrisches drehpotentiometer
JPH11111510A (ja) * 1997-10-03 1999-04-23 Alps Electric Co Ltd 電気部品
DE10336791B4 (de) * 2003-08-08 2005-07-28 Siemens Ag Füllstandsensor, Messverfahren zur Ermittlung eines Anpressdrucks eines Kontaktes gegen eine Kontaktbahn eines Potentiometers und Vorrichtung zur Durchführung des Messverfahrens
DE102006045500A1 (de) * 2006-09-27 2008-04-17 Hella Kgaa Hueck & Co. Potentiometer zur Sensierung des Verstellweges eines Stellantriebs

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188407A (en) * 1961-10-06 1965-06-08 United Aircraft Corp Brush and holder assembly
GB1428763A (en) * 1973-02-12 1976-03-17 Electronic Components Ltd Potentiometer method of and apparatus for cooling metal bars heated to a high temperature
US3982221A (en) * 1974-12-02 1976-09-21 Bourns, Inc. Contact spring for variable resistance device
US4572599A (en) * 1983-05-27 1986-02-25 Waters Manufacturing, Inc. Wiper for sliding electrical contact
DE3413741A1 (de) * 1984-04-12 1985-10-17 Oelsch KG, 1000 Berlin Schleifer fuer widerstands- oder schleiferbahnen
DE3500771A1 (de) * 1985-01-11 1986-07-17 Wilhelm Ruf KG, 8000 München Trimmer-widerstand

Also Published As

Publication number Publication date
DE3785540D1 (en) 1993-05-27
DE3629002A1 (de) 1988-03-10
EP0264570A3 (en) 1989-11-15
EP0264570A2 (de) 1988-04-27
DE3629002C2 (enrdf_load_stackoverflow) 1989-05-24
US4845461A (en) 1989-07-04

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