EP0158191A2 - Curseur pour pistes résistantes ou collectrices - Google Patents

Curseur pour pistes résistantes ou collectrices Download PDF

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Publication number
EP0158191A2
EP0158191A2 EP85103352A EP85103352A EP0158191A2 EP 0158191 A2 EP0158191 A2 EP 0158191A2 EP 85103352 A EP85103352 A EP 85103352A EP 85103352 A EP85103352 A EP 85103352A EP 0158191 A2 EP0158191 A2 EP 0158191A2
Authority
EP
European Patent Office
Prior art keywords
grinder
leaf spring
resistance
track
leaf springs
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
Application number
EP85103352A
Other languages
German (de)
English (en)
Other versions
EP0158191A3 (en
EP0158191B1 (fr
Inventor
Kurt Oelsch
Klaus Schulz
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.)
OELSCH KG
Original Assignee
OELSCH 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 OELSCH KG filed Critical OELSCH KG
Priority to AT85103352T priority Critical patent/ATE35345T1/de
Publication of EP0158191A2 publication Critical patent/EP0158191A2/fr
Publication of EP0158191A3 publication Critical patent/EP0158191A3/de
Application granted granted Critical
Publication of EP0158191B1 publication Critical patent/EP0158191B1/fr
Expired 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/12—Arrangements of current collectors

Definitions

  • Such a grinder is known from GB-A-474 406.
  • This document shows a grinder with a grinder carrier which has two parallel legs.
  • a plurality of leaf springs arranged at a distance from one another alternately extend from one leg and from the other leg into the interior of the grinder carrier.
  • the leaf springs are each bent obliquely downward from the legs and subsequently form a bend parallel to the wiper carrier, which rests as "contact means" on the resistance or wiper track and ends in a bent edge.
  • each leaf spring is clamped on one side without connection to other leaf springs. With rapid positioning movements, the leaf spring "jumps".
  • a grinder for resistance or grinding tracks is known, which is bent from a sheet metal blank. From a central part, which is arranged approximately parallel to the resistance or wiper track, a first bent sheet metal part extends along an edge at an acute angle to the resistance or wiper track. This sheet metal part forms a contact on its free edge, which lies against the resistance or wiper track. A second bent sheet metal part extends inward from the opposite edge of the central part at an acute angle. This second sheet metal part bears against the inside of the first sheet metal part facing away from the resistance or grinding track when the grinder is pressed against the resistance or grinding track. The second sheet metal part is shorter than the first and stiff and flexible. This should increase the contact force.
  • This arrangement is also asymmetrical.
  • the spring constant is increased to increase the contact force.
  • An increase in the contact force is undesirable for many applications, in particular in the case of measuring potentiometers, since this increases the friction and thus the force required for the adjustment.
  • a larger spring constant is made by the stiff and flexible sheet metal part the contact force is more dependent on small movements of the grinder.
  • the grinder's resonant frequency is also increased, which increases the risk of the contacts "jumping".
  • DE-A-3 247 410 (not prepublished) describes a grinder with a grinder carrier of a U-shaped basic shape, to which a pair of prestressed leaf springs are fastened.
  • the free ends of the leaf springs are connected to one another by a flat web which extends approximately in the same plane as the free end regions of the leaf springs and whose longitudinal axis extends transversely to the respective resistance or grinder track.
  • a wire helix surrounding the web is in contact with its windings on the resistance or grinding track.
  • the inner diameter of the wire coil is larger than the width of the web, and the winding axis of the wire coil is perpendicular to the resistance or grinding track.
  • the grinder support has a central part and two legs which extend substantially perpendicularly thereto and to the resistance or grinder track.
  • the two leaf springs are each attached to one of the legs projecting into the interior of the U-shaped grinder carrier. In their free end areas, the leaf springs overlap in the longitudinal directions at least by the width of said web. They are at a mutual distance transversely to their longitudinal directions, which is at least equal to the width of the resistance or the grinding track.
  • the free leaf springs are bent out in relation to the plane of the middle part of the wiper carrier in the direction of the resistance or wiper track and by one biased larger path than that of the possible movement perpendicular to the resistance or grinding path when moving the grinder.
  • the web and the leaf springs consist of a coherent spring plate part.
  • a second pair of additional leaf springs with a second web are formed on the spring sheet metal part and extend essentially parallel to the first pair of leaf springs which bring about contact with the resistance track.
  • a loop track runs parallel to the resistance track.
  • the arrangement of the second pair of leaf springs, the second web and a second wire helix contacting the slideway are made to each other and to the slideway in the same way as in the case of the slider parts interacting with the resistance track.
  • This grinder is asymmetrical and has a correspondingly asymmetrical mass distribution. It has been shown that such a grinder is subjected to mechanical stresses in the case of rapid alternating movements, for example movements with a mains frequency, which shorten its service life.
  • a potentiometer tap (DE-PS-2 508 530 is also known which ensures hysteresis-free guidance of the wire coil and a defined contact between the web and the wire coil without requiring particularly close tolerances.
  • a flat web is formed on the free end of the leaf spring which extends into the interior of the wire coil parallel to its longitudinal axis and whose width is smaller than the inside diameter of the wire coil and in middle area of the web is smaller than at the ends. The web engages only loosely in the wire coil, the inside diameter of the wire coil being significantly larger than the width of the web. As a result, no narrow tolerances need to be taken into account for the bridge and wire helix. The inherent elasticity of the wire helix is also not critical.
  • the assembly is considerably simplified since the wire helix can easily be pushed onto the web with play.
  • the hysteresis-free guidance and the contact between the wire helix and the web are guaranteed by the contact force acting on the web due to the pretensioning of the leaf spring, with which the potentiometer tap or the like. is pressed onto the resistance or slip track. With this contact force, the web is pressed into the arch of the wire helix, which is in contact with the conductor, and its edges lie against it on both sides.
  • the wire coil assumes a defined position with respect to the web, free of hysteresis, that is to say irrespective of the direction of movement of the potentiometer tap or the like.
  • the contact between the web and the wire helix is determined by the contact force acting on the web, which can be transferred to the respective conductor track via the web and the wire helix.
  • This contact force can easily be generated by a soft but appropriately preloaded spring, so that slight movements of the web do not noticeably influence the contact force.
  • the width of the web is smaller in the central area than at the ends, can be adapted to the contour of the resistance and wiper track without causing an impermissible "hysteresis".
  • the leaf spring is U-shaped and its middle part forms the web.
  • the web and the wire helix arranged thereon extend transversely to a resistance and a sliding contact path.
  • the invention has for its object to provide a suitable for simple movements without hysteresis and jumping, structurally simple grinder, in which stresses due to mass asymmetry are avoided.
  • Embodiments of the invention are the subject of the dependent claims.
  • the grinder 10 is a resistance track and 12 is a parallel slider track.
  • the grinder contains a grinder support 14 which has a U-shaped basic shape.
  • the grinder support 14 has a central part 16 and two legs 18 and 20 which extend substantially perpendicularly thereto and to the resistance or slip track 10 or 12.
  • Two leaf springs 22 and 24 are fastened on each of the legs 18 and 20, respectively, projecting into the interior of the U-shaped grinder carrier 14. Contact means are guided by the leaf springs 22 and 24 and held in contact with the resistance track 10.
  • One of the leaf springs 22 carries the contact means.
  • the other leaf spring 24 resiliently abuts on the former leaf spring 22 on the side facing away from the resistance track 10.
  • the legs 18 and 20 are angled relative to the central part 16 of the grinder support 14, such that the leaf springs 22 and 24 attached to the legs 18, 20 are opposite the plane of the central part 16 in the direction of the resistance track 10 are bent out and enclose an obtuse angle with their longitudinal axes.
  • the free ends of the leaf springs are bent by a greater distance by means of their pretension than that of the possible movement perpendicular to the resistance track 10 when the grinder is moved over it.
  • the leaf spring 22, which carries the contact means is of such a length that the contact means are held approximately asymmetrically to the central plane 26 of the wiper carrier.
  • the other leaf spring 24 is longer than the leaf spring 22. It overlaps it and lies on the leaf spring 22 beyond the central plane 26.
  • the leaf spring 24 has a flat, U-shaped end 28 which bears on the leaf spring carrying the contact means.
  • the contact means are formed by a broom grinder 30.
  • a wire coil could also be used of the type described above can be provided as contact means.
  • the leaf spring 24 consists of two separate, substantially parallel arms which are connected to each other by the curved end 28. The opening thus formed ensures that the leaf spring 24, although it is longer than the leaf spring 22, has essentially the same mass as the leaf spring 22.
  • a second pair of leaf springs 36 and 38 each of which with a leaf spring 22 or? 4 of the first pair causing contact with the resistance track 10 consists of a coherent spring plate part 36 or 38.
  • the spring plate parts 36 and 38 lie between insulating parts 40, 42 and 44, 46, which are connected to the legs 18 and 20 by rivets 48 and screws 50, respectively.
  • each spring sheet metal part is fastened by two rivets or two screws.
  • the second pair 36, 38 of leaf springs extend substantially parallel to the first pair 22, 24 of leaf springs.
  • a leaf spring 36 of the second pair carries contact means, also in the form of a broom lifter 52, which contact the sliding track 12 in a contacting manner.
  • the other leaf spring 38 of the second pair rests on the former leaf spring 36, as in the wiper parts located on the resistance track 10.
  • the leaf spring 38 has an opening, so that it is formed by two arms 54 and 56 interlocked with one another and essentially has the same mass as the leaf spring 36 circular opening surrounded by a collar is provided.
  • the grinder carrier 14 can thus be placed on a potentiometer shaft.
  • the resistance and grinder tracks which are only indicated schematically in the figures, then naturally run concentrically around the axis of the potentiometer shaft.
  • the grinder described is constructed symmetrically with regard to the masses of the leaf springs.
  • the leaf springs of each pair are also arranged at the same distance from the axis of the potentiometer shaft and are not radially offset from one another. It has been shown that in this way a significantly longer service life of the grinder can be achieved with alternating movements, that is to say with rapid reciprocating movements, for example at the mains frequency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
  • Details Of Resistors (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Secondary Cells (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Digital Computer Display Output (AREA)
  • Position Input By Displaying (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP85103352A 1984-04-12 1985-03-22 Curseur pour pistes résistantes ou collectrices Expired EP0158191B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85103352T ATE35345T1 (de) 1984-04-12 1985-03-22 Schleifer fuer widerstands- oder schleiferbahnen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3413741 1984-04-12
DE19843413741 DE3413741A1 (de) 1984-04-12 1984-04-12 Schleifer fuer widerstands- oder schleiferbahnen

Publications (3)

Publication Number Publication Date
EP0158191A2 true EP0158191A2 (fr) 1985-10-16
EP0158191A3 EP0158191A3 (en) 1986-10-08
EP0158191B1 EP0158191B1 (fr) 1988-06-22

Family

ID=6233336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103352A Expired EP0158191B1 (fr) 1984-04-12 1985-03-22 Curseur pour pistes résistantes ou collectrices

Country Status (6)

Country Link
US (1) US4635028A (fr)
EP (1) EP0158191B1 (fr)
JP (1) JPH0785444B2 (fr)
AT (1) ATE35345T1 (fr)
DE (2) DE3413741A1 (fr)
ES (1) ES8608218A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0264570A2 (fr) * 1986-08-27 1988-04-27 Wilhelm Ruf KG Potentiomètre

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT206325Z2 (it) * 1985-10-31 1987-08-10 Rockwell Rimoldi Spa Dispositivo di comando mediante segnali in codice delle funzioni esercitate da una macchina per cucire.
TW309159U (en) * 1994-12-28 1997-06-21 Hokuriku Elect Ind Co Ltd High-voltage variable resistor
TW311726U (en) * 1995-07-20 1997-07-21 Hokuriku Elect Ind Compact high-voltage variable resistor
TW328134B (en) * 1996-06-27 1998-03-11 Hokuriku Elect Ind Variable resistor element for high voltage application
US20080258366A1 (en) * 2007-04-17 2008-10-23 Erick Tuttle Spring apparatus and a method of providing such

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB606467A (en) * 1946-01-15 1948-08-13 Smith & Sons Ltd S Improvements in or relating to electrical contacts
GB684067A (en) * 1951-02-07 1952-12-10 Fr De L Electro Resistance Soc Improvements in potentiometers
FR2205715A1 (fr) * 1972-11-04 1974-05-31 Itw Ateco Gmbh
FR2282150A1 (fr) * 1974-08-13 1976-03-12 Falco Eugenio Perfectionnements aux potentiometres lineaires
US3982221A (en) * 1974-12-02 1976-09-21 Bourns, Inc. Contact spring for variable resistance device
FR2528222A1 (fr) * 1982-06-04 1983-12-09 Jaeger Perfectionnements aux equipages curseurs pour potentiometres realises selon la technologie des couches epaisses

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617976A (en) * 1968-02-08 1971-11-02 Stackpole Component Co Double path linear motion potentiometer
US3569897A (en) * 1968-10-03 1971-03-09 Bourns Inc Potentiometer multifinger contact assembly
JPS5423908A (en) * 1977-07-22 1979-02-22 Canon Inc Vibration-proof for brush in rotary equipment
JPS6038252Y2 (ja) * 1978-06-09 1985-11-15 アルプス電気株式会社 ハイワツテージ用スライド形２連可変抵抗器
JPS5859347U (ja) * 1981-10-19 1983-04-21 アルプス電気株式会社 小型電動機の刷子装置
JPS59106105A (ja) * 1982-12-10 1984-06-19 アルプス電気株式会社 摺動子の形成方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB606467A (en) * 1946-01-15 1948-08-13 Smith & Sons Ltd S Improvements in or relating to electrical contacts
GB684067A (en) * 1951-02-07 1952-12-10 Fr De L Electro Resistance Soc Improvements in potentiometers
FR2205715A1 (fr) * 1972-11-04 1974-05-31 Itw Ateco Gmbh
FR2282150A1 (fr) * 1974-08-13 1976-03-12 Falco Eugenio Perfectionnements aux potentiometres lineaires
US3982221A (en) * 1974-12-02 1976-09-21 Bourns, Inc. Contact spring for variable resistance device
FR2528222A1 (fr) * 1982-06-04 1983-12-09 Jaeger Perfectionnements aux equipages curseurs pour potentiometres realises selon la technologie des couches epaisses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0264570A2 (fr) * 1986-08-27 1988-04-27 Wilhelm Ruf KG Potentiomètre
EP0264570A3 (en) * 1986-08-27 1989-11-15 Wilhelm Ruf Kg Potentiometer

Also Published As

Publication number Publication date
ATE35345T1 (de) 1988-07-15
ES8608218A1 (es) 1986-06-01
JPS616803A (ja) 1986-01-13
DE3413741A1 (de) 1985-10-17
EP0158191A3 (en) 1986-10-08
EP0158191B1 (fr) 1988-06-22
US4635028A (en) 1987-01-06
JPH0785444B2 (ja) 1995-09-13
ES542117A0 (es) 1986-06-01
DE3563490D1 (en) 1988-07-28

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