EP0348729B1 - Potentiometer und Verfahren zu dessen Herstellung - Google Patents

Potentiometer und Verfahren zu dessen Herstellung Download PDF

Info

Publication number
EP0348729B1
EP0348729B1 EP89110701A EP89110701A EP0348729B1 EP 0348729 B1 EP0348729 B1 EP 0348729B1 EP 89110701 A EP89110701 A EP 89110701A EP 89110701 A EP89110701 A EP 89110701A EP 0348729 B1 EP0348729 B1 EP 0348729B1
Authority
EP
European Patent Office
Prior art keywords
potentiometer
resistance
housing
chimney
resistance plate
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
EP89110701A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0348729A2 (de
EP0348729A3 (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 EP0348729A2 publication Critical patent/EP0348729A2/de
Publication of EP0348729A3 publication Critical patent/EP0348729A3/de
Application granted granted Critical
Publication of EP0348729B1 publication Critical patent/EP0348729B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors

Definitions

  • the invention relates to a potentiometer according to the preamble of claim 1 and to a method for its production.
  • Such a potentiometer is known from US 3,961,302.
  • the resistance carrier reaches with a pin through a central opening of the resistance plate and is caulked on the exit side, which creates a widening that holds the rotary driver against the resistance plate.
  • the rotary driver thus unclamped the wiper spring and, by caulking its peg, to a certain extent also the resistance carrier.
  • potentiometer is known from the applicant's older, unpublished German patent application P 37 31 328.2.
  • two potentiometer halves were manufactured there using injection molding technology, both potentiometer halves each containing certain functional parts of the potentiometer. The two potentiometer halves were then ultrasonically welded together.
  • This potentiometer is absolutely liquid-tight and can already be largely automatically produced. In its construction with the two housing halves, however, it is still relatively complicated and complex to manufacture. In particular, quite a lot of work steps are carried out for its manufacture, which in turn requires complex production facilities.
  • the object of the invention is therefore to improve the potentiometer of the type mentioned in such a way that its design is simpler and therefore it can be produced fully automatically with fewer work steps.
  • the potentiometer can be produced fully automatically on an injection molding machine and in an injection mold which, in addition to the actual injection molding process, also performs additional functions such as punching out individual parts from the belt and bending tabs. There are no longer any manual assembly steps required. Rather, only three belts or belts are passed through the injection molding machine in cycles.
  • a base plate 60 (FIG. 3) remains as a central part in the finished potentiometer, which serves as part of the injection mold during the injection molding.
  • a chimney-like flare 69 is drawn up from the base plate by deep drawing, centered on the axis of rotation 8 of the potentiometer.
  • the resistance plate 5 is pushed over this chimney-like flare 69, the chimney-like flare 69 being so long that it projects beyond the top of the resistance plate 5.
  • the underside of the resistance plate 5 lies on the base plate 60 and is centered on the chimney-like flange 69 through its central opening.
  • the wiper spring 3 rests on the upper end face of the chimney-like flare 69, namely in good electrical contact, with an embossed dome 9 of the wiper spring 3 resting on the resistance track on the upper side of the resistance plate 5.
  • a disc 4 is inserted, which serves as a spacer between these parts and also ensures during injection molding that no plastic penetrates into the area between the resistance track and the wiper spring.
  • the base plate 60, the resistance plate 5, the disk 4 and the wiper spring 3 are held by the housing 1 and the spring support 2, respectively.
  • the housing 1 and the spring support 2 are in plastic injection molding technology molded in one piece, these two parts being initially connected to one another in one piece by a shearable sprue nose 7. By turning the spring support 2 after manufacture, the sprue 7 can be sheared off, so that the spring support can then be rotated relative to the housing and thereby takes the wiper spring with it, which then slides along the resistance path on the resistance plate 5.
  • the spring support 2 has a cylindrical center piece 10 which projects through the chimney-like flare 69.
  • the spring carrier is widened radially outward on both sides of this center piece, so that the parts lying between are gripped or clasped.
  • the underside of the base plate 60 and the inside of the chimney-like flare 69 serve as slide bearings for the spring support 2.
  • the inside of the chimney-like flare 69 is not critical since the shrinking of the plastic during curing will result in a slight bearing play.
  • the bottom side of the base plate 60 is more critical, for this reason it is also made as flat and smooth as possible in the area of contact with the spring support 2.
  • Annular cavities 11 are provided between the housing 1 and the spring support 2 on both sides of the base plate 60 or the resistance plate 5, the sprue nose 7 also being located in the cavity 11.
  • a seal are introduced, which is easiest by inserting an O-ring seal - not shown.
  • the cavity 12 is not critical, since the base plate 60 lies in the base of this cavity, as a result of which this cavity is closed inwards to the potentiometer and neither dust nor liquid can penetrate there.
  • the base plate 60 has two connecting lugs 61 and 62 which protrude outwards on both sides through the housing 1 and which serve as center or wiper taps of the potentiometer.
  • terminal lugs 65, 66, 67 and 68 (FIGS. 2 and 3), these terminal lugs being part of the carrier tape 6 and only being separated from the carrier tape after the injection molding process.
  • the carrier tape 6 has various openings 13 to 18 in the region of a base plate (see view X of FIG. 6), as a result of which the basic contour of the base plate 60 is defined, which is then determined by Tabs 61, 62 and 65 to 68 is still held on the carrier tape 6. Furthermore, two tabs 63 and 64 protrude into the openings 13 and 14, which serve as support tabs during transport and during the injection molding process.
  • the two middle 61 and 62 form the connecting lugs for the center tap from the tabs projecting inwards like a comb from both sides of the potentiometer (cf. FIG. 2).
  • the pair of outer tabs 65 to 68 are used to hold the resistance plate and the contact.
  • the spring support 2 has a cross slot 20 on its top and bottom for rotation with a screwdriver or the like.
  • the manufacturing process is described in more detail below with reference to FIGS. 6 to 9.
  • the required individual parts are supplied to the injection molding machine in the form of carrier tapes or belts, these tapes running parallel to one another. All carrier tapes have centering openings 22, with which an exact alignment of the individual parts is ensured in cooperation with pins arranged in the injection mold.
  • the carrier tape 6 (cf. FIG. 7) is already prepared when it is fed to the injection mold and has the punched-outs 13 to 18 (FIG. 6) and the chimney-like flare 69.
  • a first step the stamps in the stamping tool or in the injection tool Contact arms reevers (see lines 19 in Fig. 6). This work step can therefore still count towards the pre-processing of the carrier tape 6 or already among the work steps that are carried out in the injection mold.
  • the contact arms are then bent up (see Fig. 7b).
  • the resistance plate is inserted, whereby the resistance plates can also be fed through belts.
  • the contact arms are then bent back (see FIG. 7c), whereby the resistance plate is held firmly.
  • the second carrier tape 23 is also pre-punched, with a central opening 24 and with four circular openings 25 to 28, which partially protrude into the interior of the circular contour 29 of the disk, so that the finished disk 4 (see FIG. 9b) around its circumference irregularly distributed four incisions 25 'to 28', which serve for positive anchoring in the spring support.
  • the wiper springs 3 are also held on a third carrier tape 30, this carrier tape also having pre-punched holes 31 to 34.
  • the diameter of the hole 31 is smaller than that of the hole 24.
  • the diameter is essentially of the hole 31 is approximately equal to the inside diameter of the chimney-like flare 69, so that the wiper spring 3 can rest on its end face (cf. FIGS. 1 and 3).
  • the carrier tape 30 has pre-fabricated domes 9. These domes lie in the region of the opening 27 'of the disc 4, while the openings 32, 33 and 34 are congruent to the openings 28, 26 and 25, respectively.
  • this disk 4 is now punched out completely from the second carrier tape 23 along the contour 29 and, with its central opening 24, pushed over the section of the chimney-like flange 69 protruding from the resistance plate 5.
  • the spring washer is then punched out of the carrier tape 30 along the contour 35 and placed in the interior of the injection mold so that it is in contact with the washer 4 and the end face of the chimney-like flare 69.
  • the disk 4 and the wiper spring 3 are punched out and placed by the closing movement of the injection mold by means of a stamp in one work sequence.
  • the spraying can take place in multiple uses, for example twelve potentiometers can be produced simultaneously.
  • the injection mold is opened and a new work cycle begins.
  • the tabs 65 to 68 (cf. FIG. 2) can be separated from the carrier tape 6.
  • the sprue 7 has to be sheared off, which is done by turning the spring support 2. It can be seen that even this step can be carried out fully automatically, since all the spring supports come out of the injection molding machine in the same orientation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Adjustable Resistors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP89110701A 1988-07-01 1989-06-13 Potentiometer und Verfahren zu dessen Herstellung Expired - Lifetime EP0348729B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3822391 1988-07-01
DE3822391A DE3822391A1 (de) 1988-07-01 1988-07-01 Potentiometer und verfahren zu dessen herstellung

Publications (3)

Publication Number Publication Date
EP0348729A2 EP0348729A2 (de) 1990-01-03
EP0348729A3 EP0348729A3 (en) 1990-04-25
EP0348729B1 true EP0348729B1 (de) 1994-04-27

Family

ID=6357799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89110701A Expired - Lifetime EP0348729B1 (de) 1988-07-01 1989-06-13 Potentiometer und Verfahren zu dessen Herstellung

Country Status (4)

Country Link
US (1) US4998089A (sh)
EP (1) EP0348729B1 (sh)
DE (2) DE3822391A1 (sh)
YU (1) YU46939B (sh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2063695B1 (es) * 1993-04-14 1997-12-01 Navarra Componentes Electro Potenciometro miniatura y procedimiento para su fabricacion.
FR2704086B1 (fr) * 1993-04-14 1995-06-16 Nacesa Potentiometre miniature et procede automatique de fabrication de potentiometres miniatures.
US6301745B1 (en) 1999-11-05 2001-10-16 Xerox Corporation Sliding bushing with spring

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3375478A (en) * 1964-05-11 1968-03-26 Cts Corp Electrical control and method of making the same
DE1914865B2 (de) * 1969-03-24 1972-12-07 CRL Electronic Bauelemente GmbH, 8500 Nürnberg Verfahren zum montieren von trimmerwiderstaenden auf einer transferstrasse
US3869789A (en) * 1974-05-31 1975-03-11 Spectrol Electronics Corp Method of manufacturing variable resistance device
US3961302A (en) * 1974-11-15 1976-06-01 Cts Corporation Variable resistance control
US4117444A (en) * 1977-07-14 1978-09-26 Bourns, Inc. Hearing aid volume control
US4210896A (en) * 1978-04-24 1980-07-01 Cts Corporation Variable resistance control and method of making the same
GB2167981A (en) * 1984-11-21 1986-06-11 Piher Navarra Sa Adjustable potentiometers
ES2018892A6 (es) * 1986-11-25 1991-05-16 Navarra Componentes Electro Potenciometro

Also Published As

Publication number Publication date
EP0348729A2 (de) 1990-01-03
US4998089A (en) 1991-03-05
EP0348729A3 (en) 1990-04-25
DE58907549D1 (de) 1994-06-01
YU46939B (sh) 1994-06-24
DE3822391A1 (de) 1990-01-04
YU130189A (sh) 1992-07-20
DE3822391C2 (sh) 1992-03-05

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