EP0307899A2 - Potentiomètre et son procédé de fabrication - Google Patents

Potentiomètre et son procédé de fabrication Download PDF

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Publication number
EP0307899A2
EP0307899A2 EP88115049A EP88115049A EP0307899A2 EP 0307899 A2 EP0307899 A2 EP 0307899A2 EP 88115049 A EP88115049 A EP 88115049A EP 88115049 A EP88115049 A EP 88115049A EP 0307899 A2 EP0307899 A2 EP 0307899A2
Authority
EP
European Patent Office
Prior art keywords
base plate
rotary driver
housing
potentiometer
resistance
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
EP88115049A
Other languages
German (de)
English (en)
Other versions
EP0307899B1 (fr
EP0307899A3 (en
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 EP0307899A2 publication Critical patent/EP0307899A2/fr
Publication of EP0307899A3 publication Critical patent/EP0307899A3/de
Application granted granted Critical
Publication of EP0307899B1 publication Critical patent/EP0307899B1/fr
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
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/024—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being hermetically sealed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path

Definitions

  • the invention relates to a potentiometer according to the preamble of claim 1 and to a method for its production.
  • Potentiometers of this type are generally known in the prior art, in particular in the form of rotary potentiometers.
  • DE-PS 27 09 998 proposes a shaft collar for sealing the actuating shaft of a trim potentiometer on the one hand and a chamber of the housing receiving the collar on the other hand to be filled with grease, while the housing and housing cover are sealed by a sealing compound. This is technically complex.
  • the "grease pack" only has a temporary sealing function, since grease gums up and, if the potentiometer is operated frequently, it also oozes out of its chamber.
  • the object of the invention is to improve the potentiometer of the type mentioned in such a way that it can be manufactured very inexpensively and largely automatically, its interior being hermetically sealed, in particular thus being liquid-tight.
  • Claim 10 describes a production process from the tape, with which the potentiometer according to the invention can be produced in a multiple use largely fully automatically.
  • Claim 7 favors the seal, since there is practically no gap into which liquid can still penetrate, since the welding is carried out as close as possible to the edge of the passage opening.
  • Claim 9 has the advantage that you no longer need separate soldering tags, these are rather an integral part of the base plates.
  • the potentiometer consists of two assemblies, namely a "lower” assembly and a cover assembly.
  • the lower assembly in turn consists of a lower housing part 1, a lower rotary driver half 3, a lower base plate 5 and a wiper spring 8.
  • the cover assembly consists of a cover housing part 2, a base plate 6 and a resistance plate 7. The two assemblies are welded together so that an interior space 9, in which the wiper spring 8 and the resistance plate 7 are located, is hermetically sealed to the outside, so that neither moisture nor any liquids can penetrate into this interior.
  • the housing parts 1 and 2 and the rotary driver halves 3 and 4 are each made of sprayable plastic, which is partially molded around the associated base plate 5, 6, whereby on the one hand between the housing parts 1 and 2 and the associated base plate 5 and 6, of which solder tabs 51, 61 and 62 extend out of the housing, get a perfect seal and on the other hand between the rotary driver halves 3 and 4 and the associated base plates 5 and 6 both a perfect seal and a precisely defined torque for turning the two rotary driver halves compared to the base plates.
  • the two assemblies are welded using ultrasonic energy.
  • the one housing part 1 and the one rotary driver half 4 each have a bead 15 or 47 pointing towards the opposite part, which is approximately triangular in cross section and thus ends in a sharp tip, which emits the ultrasonic energy absorbed so that there is a welding of the plastic.
  • the cover housing part 2 and the lower half of the rotary driver have the circumferential beads 15 or 47 opposite flat surfaces 25 or 37, the flat surface 25 of the cover housing part 2 being designed as a groove with a flat groove base, this groove being essentially completely filled by the material of the bead 15 after welding.
  • both base plates 5 and 6 are made of electrically conductive material, for example made of bronze. Of course, other materials, e.g. electrically conductive coated plates can be used.
  • the upper side of the base plate 5 facing the interior 9 serves as a sliding track on which spring tongues 80 of the sliding spring 8 slide. Since the base plate 5 opens into the solder tab 51 protruding from the housing, the center tap of the potentiometer is obtained.
  • the wiper spring 8 has spring tongues 81 which slide on the resistance path of the resistance plate 7 pointing towards the interior 9. Since the spring tongues 81 are electrically connected to the spring tongues 80 via the wiper spring 8, the soldering lug 51 is electrically connected to the wiper tap of the resistance path of the resistance plate 7 via two wiper systems (80, 81).
  • the two side taps of the resistance plate 7 are formed by contact tabs 63 and 64, which are formed from the material of the base plate 6 by punching out and bending up and touch the respective ends of the resistance track. Since these contact tabs 63 and 64 are also cast into the plastic material of the housing part 2 and the plastic shrinks somewhat during curing, there is sufficient pressure or contact force between the respective contact tab 63 or 64 and the respective end of the resistance layer 70.
  • the plastic parts 1 and 3 on the one hand and 2 and 4 on the other hand are each cast completely in one mold, which is why they have the same hatching in the drawings.
  • the base plate 5 has essentially the shape of an annular disk. Its outer edge is indicated by the dashed line 52, while its inner, circular edge is indicated by the dashed line 53.
  • the soldering lug 51 still protrudes from this “disk”, which does not yet stand during the casting, as in FIG. 3 shown - is angled but lies in one plane with the base plate 5.
  • the base plate is still held in a carrier tape, not shown, by the soldering tab 51, which has not yet been separated from this plate at its free end, and a further web 54 (FIG. 2).
  • This plate with the partially punched-out contour of the base plate is inserted into an injection mold, in which the housing part 1 and the rotary driver half 3 are then cast as one piece, these two parts being cast through the pouring nose 17 are still connected.
  • the base plate 5 itself serves as part of the casting mold. As can best be seen from FIG. 3, the base plate 5 is covered on both sides by plastic on its outer edges, this plastic shrinking during curing and therefore pressing firmly against the base plate, thus achieving the desired sealing at this edge becomes.
  • the rotary driver 3 overlaps the material of the base plate around the circular edge 53, the desired pressing force for the sealing being achieved here on the one hand by the shrinking of the material during curing, and on the other hand also the torque for rotating the driver 3 by this pressing force compared to the base plate 5 can be adjusted precisely.
  • the decisive factor is the shrinkage behavior of the plastic, which is in the order of 0.2 to 0.8% depending on the plastic used.
  • the housing part 1 has a substantially cylindrical jacket-shaped base body 10 with a radially inwardly projecting stop lug 11, from which the pouring lug 17, which will later be removed or broken away, extends to the rotary driver half 3.
  • a radially inwardly projecting stop lug 11 from which the pouring lug 17, which will later be removed or broken away, extends to the rotary driver half 3.
  • an approximately rectangular extension adjoins one side of the base body 10, which has openings 13, into which stamps protrude which hold the base plate during casting.
  • the edge 18 of the base body 10 pointing towards the center is circular.
  • the rotary driver half 3 At a distance from this edge 18 is the rotary driver half 3, which in turn has a radially outwardly projecting stop lug 31, which can come to a stop on the respective side of the stop lug 11 when the rotary driver half rotates about the axis of rotation 30.
  • the rotary driver 3 has on its upward (Fig. 3) or towards the interior 9 (Fig. 1) side a disc-shaped projection 32, which (see Fig. 4) does not extend around the full circle, so that there is a sufficiently wide section in which the base plate 5 is accessible from the interior 9.
  • This disk-shaped projection 32 serves as a support for the wiper spring 8, while its cutout allows the spring tongues 80 to make contact with the surface of the base plate 5.
  • the rotary driver half 3 has a central through opening 33, which has a radial widening in its inward-facing section, which carries an internal toothing 34.
  • the middle, narrower section of the passage opening 33 has projections 35 which serve as rotary stops or rotary drivers for an actuating shaft of the potentiometer.
  • the disk-shaped protrusion 32 has axially upwards, that is to say the webs 36 pointing towards the interior 9, which protrude from the cylindrical central part of the rotary driver 3 and which serve as centering pins for the wiper spring 8 (cf. FIG. 4).
  • the surface of the housing part 1 facing the interior (upward in FIG. 3) has a circumferential and self-contained bead 15 (FIGS. 3 and 4) which is triangular in cross section and thus ends in a sharp tip, which for absorption ultrasonic energy is particularly cheap.
  • the through opening 33 of the rotary driver half 3 has, adjacent to the internal toothing 34, a flat, annular surface 37 (FIG. 3) which serves as a welding surface for the tapered bead 47 of the other rotary driver part 4 (FIG. 6).
  • the housing part 1 in the area of the recesses 13 still has upward (Fig. 3) or in the interior 9 protruding centering pin 16 (Fig. 3 and 4) which later protrude into the recesses 23 (Fig. 5 to 7).
  • the wiper spring 8 is inserted and clamped and / or caulked on the centering pin 36, so that it is connected in a rotationally fixed manner to the rotary driver half 3.
  • the base plate 6 is punched out in the desired manner, it being held in one plate by a total of three webs. Two of these webs are formed by the solder tails 61 and 62, while the third web 67 is later completely separated.
  • the disk-shaped resistance plate 7, which, however, does not run through a full circle but has a slit-shaped cutout 71, is inserted between the base plate and contact tabs such that the two contact tabs 63 and 64 place the resistance track 70 on the inside 9 Touch the facing side of the resistance plate 7. Further, a retaining web 65 of the base plate is bent up to hold the resistance plate 7 (left in FIG.
  • the housing part 2 and the rotary driver half 4 are injection molded in one piece, these two parts being connected to one another via the pouring nose 27 (FIG. 6).
  • the plastic overlaps the base plate 6 and also the tabs 63, 64 and 65, as a result of which the contact pressure required for a perfect seal is obtained.
  • This contact pressure also presses the contact tabs 63 and 64 against the resistance plate 6 or against the resistance layer thereof, so that a sufficient contact force is obtained for a low-resistance contact resistance.
  • the other rotary driver half 4 is also injection molded onto the base plate 6, the rotary driver half 4 engaging over the central, circular opening of the base plate 3 on both sides.
  • the essentially cylindrical part of the rotary driver 4, which projects downward in FIG. 6, has an external toothing 44 which later comes into engagement with the internal toothing 34 of the rotary driver 3.
  • the axially inner end of the rotary driver opens into the circumferential, splash bead 47, which later lies against the surface 37 of the rotary driver 3 (FIG. 3) and is welded there by ultrasound.
  • the rotary driver 4 Concentric to its axis of rotation 40, the rotary driver 4 has a through opening 43 with radially inwardly projecting projections 45 which serve as drivers for the rotary shaft (cf. projections 35). Also the Rotary driver 4 has a radially outwardly projecting stop lug 41 (cf. the stop lug 31 of the rotary driver), the housing part 20 also having a stop 21 corresponding to the stop 11. The edge 28 and the edge 18 as well as the recess 24 and the recess 14 also correspond.
  • the production is preferably carried out in tape production in multiple uses, ie the contours for the base plates 5 and 6 are first punched out on a carrier tape or a larger board, these being still held on the carrier tape via the webs. Then individual sections (see FIG. 6) are bent up and the resistance track (in the case of multiple use, the resistance plates) is pushed in. The plastic injection then takes place in multiple uses. After the plastic has hardened, the wiper springs are pressed onto the corresponding housing parts and held and centered there by lugs. Then the solder lugs are punched and the connecting webs are cut off, whereupon the central solder lug 51 is angled. One potentiometer half is then pushed down through the carrier tape, whereupon the pressed potentiometer half is moved and positioned so that the parts that belong together lie one above the other. These parts are then pressed together and welded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
EP88115049A 1987-09-17 1988-09-14 Potentiomètre et son procédé de fabrication Expired - Lifetime EP0307899B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3731328A DE3731328C1 (de) 1987-09-17 1987-09-17 Potentiometer und Verfahren zu dessen Herstellung
DE3731328 1987-09-17

Publications (3)

Publication Number Publication Date
EP0307899A2 true EP0307899A2 (fr) 1989-03-22
EP0307899A3 EP0307899A3 (en) 1989-07-26
EP0307899B1 EP0307899B1 (fr) 1991-09-11

Family

ID=6336274

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115049A Expired - Lifetime EP0307899B1 (fr) 1987-09-17 1988-09-14 Potentiomètre et son procédé de fabrication

Country Status (5)

Country Link
US (1) US4866413A (fr)
EP (1) EP0307899B1 (fr)
DE (2) DE3731328C1 (fr)
ES (1) ES2025263B3 (fr)
YU (1) YU47202B (fr)

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1311847A (fr) * 1961-09-08 1962-12-14 Electronique & Automatisme Sa Potentiomètre d'affichage pour calculateurs analogiques
US3470519A (en) * 1966-07-14 1969-09-30 Bourns Inc Potentiometer
US3671914A (en) * 1969-11-10 1972-06-20 Markite Corp Rotary potentiometer
US3697921A (en) * 1971-10-21 1972-10-10 Electrohome Ltd Dual control mechanism
DE2416659B2 (de) * 1973-04-09 1976-10-28 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) Vorrichtung zum steuern von mehreren zu einem satz zusammengefassten widerstaenden
US3918022A (en) * 1974-06-10 1975-11-04 Mallory & Co Inc P R Control device with axially aligned, independently rotatable variable resistors
US3953821A (en) * 1974-12-09 1976-04-27 Cts Corporation Variable resistance control
US4035758A (en) * 1976-03-15 1977-07-12 P. R. Mallory & Co., Inc. Adjustable variable resistance control system
US4109230A (en) * 1977-02-16 1978-08-22 Allen-Bradley Company Compact electrical control
DE2709998C2 (de) * 1977-03-08 1988-06-16 Wilhelm Ruf KG, 8000 München Flüssigkeitsdichte Gleitlagerung von Wellen in Kleinbauteilen
US4114445A (en) * 1977-05-18 1978-09-19 Honeywell Inc. Electrical thermostat control apparatus
US4210896A (en) * 1978-04-24 1980-07-01 Cts Corporation Variable resistance control and method of making the same
GB2100523B (en) * 1981-03-30 1985-02-27 Iskra Sozd Elektro Indus Adjustable enclosed potentiometer
US4521761A (en) * 1984-02-17 1985-06-04 Sangamo Weston, Inc. Small outline potentiometer
DE3714348A1 (de) * 1987-04-29 1988-11-17 Ruf Kg Wilhelm Potentiometer
DE3717117A1 (de) * 1987-05-21 1988-12-01 Ruf Kg Wilhelm Verfahren zur herstellung eines stellgliedes, insbesondere fuer linearpotentiometer sowie nach dem verfahren hergestelltes stellglied
DE3717306A1 (de) * 1987-05-22 1988-12-01 Ruf Kg Wilhelm Verfahren zum herstellen eines elektrischen kontaktes und nach dem verfahren hergestellte leiterbahnplatte

Also Published As

Publication number Publication date
DE3731328C1 (de) 1989-01-12
EP0307899B1 (fr) 1991-09-11
DE3864784D1 (de) 1991-10-17
YU47202B (sh) 1995-01-31
EP0307899A3 (en) 1989-07-26
ES2025263B3 (es) 1992-03-16
YU172388A (en) 1991-02-28
US4866413A (en) 1989-09-12

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