EP0292016B1 - Composant de réglage, en particulier pour un potentiomètre linéaire - Google Patents

Composant de réglage, en particulier pour un potentiomètre linéaire Download PDF

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Publication number
EP0292016B1
EP0292016B1 EP88108165A EP88108165A EP0292016B1 EP 0292016 B1 EP0292016 B1 EP 0292016B1 EP 88108165 A EP88108165 A EP 88108165A EP 88108165 A EP88108165 A EP 88108165A EP 0292016 B1 EP0292016 B1 EP 0292016B1
Authority
EP
European Patent Office
Prior art keywords
guide element
sliding
segments
actuator
slot
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
EP88108165A
Other languages
German (de)
English (en)
Other versions
EP0292016A3 (en
EP0292016A2 (fr
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 EP0292016A2 publication Critical patent/EP0292016A2/fr
Publication of EP0292016A3 publication Critical patent/EP0292016A3/de
Application granted granted Critical
Publication of EP0292016B1 publication Critical patent/EP0292016B1/fr
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
    • H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path

Definitions

  • the invention relates to an actuator according to the preamble of claim 1.
  • Such an actuator - a linear potentiometer - is known from US-A-3 732 521.
  • the potentiometer is composed of two housing parts, which after assembly form a guide element with an elongated hole.
  • a sliding body is slidably guided in this slot.
  • the sliding body has a plate-shaped base arranged on the upper side of the guide element with upper sliding segments protruding laterally beyond the elongated hole, as well as a section adjoining the base and arranged inside the elongated hole and adjoining lower sliding segments.
  • the sliding segments with their surfaces facing the guide element are in sliding contact with the top and bottom of the guide element. They are at least partially offset from one another in the longitudinal direction of the elongated hole, but overlap to such an extent that they can jam in harsh environmental conditions.
  • the guide element and the sliding body are made of different plastics, which differ in particular in terms of their softening temperature.
  • the guide element is produced, which is then inserted into an injection mold and thus itself forms part of the injection mold, the sliding body then being injection molded onto the guide element in a further injection molding process.
  • the guide element has in all cases one or more grooves in which the sliding body is held in a form-fitting manner with a thickening or widening (see FIGS. 8 and 10 of DE-A-26 27 346).
  • This results in material accumulations of the sliding body which are disadvantageous from an injection molding point of view, particularly in the area of the groove, since the shrinking behavior of plastics depends to a large extent on the shape of the material accumulations and can therefore be non-uniform. This then leads to deteriorated sliding properties of the sliding body and to the tendency for the sliding body to tilt and thus jam when displaced.
  • actuators used in linear potentiometers which are commercially available, are constructed so that the actuators have a guide element with an elongated hole, in which a sliding body is slidably guided.
  • the sliding body which carries the sliding contact springs on a potentiometer as a so-called spring support, is secured as security against falling out of the elongated hole by inserted pins which are inserted into a bore in the sliding body and protrude laterally beyond the elongated hole.
  • the guide element with an elongated hole on the one hand and the sliding body on the other hand were each manufactured separately and then assembled together. In these known actuators, it is disadvantageous that the tolerances to be observed increase the manufacturing effort.
  • the sliding body If the sliding body is "too tight” to the guide element and the elongated hole, it slides, if at all, only with difficulty and not smoothly. If, on the other hand, the adjustment is "too loose", the sliding body can on the one hand jam during its movement and thus jam and on the other hand it is no longer guided with sufficient precision so that, for example, with a linear potentiometer between the mechanical position of the sliding body relative to the guide element and the electrical setting Resistance value there is no clearly reproducible relationship. When manufacturing these actuators, therefore, very tight manufacturing tolerances must be observed, which in turn is complex. Even then, the tolerances set in each production can still be in add unfavorable direction so that the risk of rejects is still relatively large.
  • the object of the invention is therefore to improve the actuator of the type mentioned in such a way that the sliding properties of the actuator are further improved.
  • This object is achieved in the generic actuator by the features of claim 1.
  • Advantageous refinements and developments of the invention can be found in the subclaims.
  • those parts of the sliding body which serve as guide elements are injection-molded in such a way that no unfavorable distortions or bending occur when the plastic is shrunk. You also get multi-point bearings of the sliding body on the guide element, with which tilting or jamming of the sliding body is prevented even more effectively, while simultaneously reducing the frictional forces, taking into account the peculiarities of injection molding technology, in particular with regard to cooling behavior, shrinkage and formation of voids.
  • Actuators of the type dealt with here are used in the most varied fields of technology, for example as a displaceable spring support in linear potentiometers, as a contact support in slide switches, as actuators for mechanical cam controls, as actuators for sensors, etc.
  • harsh environmental conditions such as dust, oil or other dirt as well as strong temperature fluctuations up to icing.
  • Such environmental conditions occur, for example, when used in motor vehicles when linear potentiometers are used as measuring sensors for sensing the throttle valve position or as other measuring sensors, for example for level control, headlight range adjustment, etc. Due to the special design of the actuator according to the invention, it still works perfectly even with dirt, icing, etc. (of course only to a certain degree).
  • the sliding body is in one piece, so that assembly steps are eliminated and the problem of dimensional tolerances is solved satisfactorily. Even if the thickness of the guide element or the width of the elongated hole fluctuate within large tolerances, the "molded" sliding body is individually adapted to the associated guide element, since the latter is part of the injection mold. Dimensional inaccuracies of the guide element have no negative influence. Dimensional tolerances cannot add up unfavorably.
  • shrinkage or shrinkage of 0.5 to 1% occurs. This is very desirable in the invention, since this shrinkage gives the necessary bearing play which allows the sliding body to be displaced relative to the guide element. This play of 0.5 to 1%, which occurs with most sprayable plastics during shrinking, has proven to be the optimal play, which both allows extremely precise guidance, prevents tilting and also moves the sliding body in the event of contamination or icing allowed.
  • the sliding body 7, as can best be seen from FIGS. 8 and 9, has a section 8 which is immersed in the elongated hole 2 and whose side walls 9 and 10 are guided on the guide surfaces 3 and 4, respectively.
  • a "bearing play" which arises in the manufacturing process by the fact that during the injection molding process the plastic - accordingly the other shape of the sliding body - is injected into parts of the elongated hole, the guide surfaces 3 and 4 of the elongated hole serving as a shape, the plastic then shrinking during the subsequent hardening, namely by about 0.5 to 1%.
  • the total play between the surfaces 4 and 9 and 3 and 10 is always 0.5 to 1% of the distance between the guide surfaces 3 and 4.
  • section 8 extending in the interior of the elongated hole 2 is in principle cuboid in the illustrated exemplary embodiments.
  • section 8 is of course adapted to this contour.
  • the section can be approximately cylindrical so that it can run in the elongated hole thus curved without tilting. In this case, the injection mold must ensure that it is approximately cylindrical.
  • the sliding body 7 also has a base 11 lying outside the elongated hole, to which the sliding segments are attached in one piece and to which an actuating lever 12 of any shape is also attached.
  • This operating lever can also be optionally already in the injection mold manufacture or screw on later, glue etc.
  • FIGS. 1 to 9 a total of six sliding segments 13, 14, 15, 16, 17 and 18 are provided.
  • the sliding segments 13 and 14 On the top 5 of the guide element, four sliding elements 13, 14, 15 and 16 are provided, which project laterally at both ends beyond the elongated hole, so that the guide element rests on four surfaces on the top 5 of the guide element 1.
  • sliding body On the underside 6 of the sliding body, on the other hand, only two sliding segments 17 and 18 are provided, which are seen in the longitudinal direction of the sliding body and are arranged approximately in the middle thereof.
  • the sliding body is thus prevented by the six surfaces of the sliding segments 13 to 18 and by the side surfaces 9 and 10 of section 8 (FIG. 8) from tipping or rotating about the three possible axes of tilt or rotation relative to the guide element 1 secured.
  • a four-point bearing arrangement is provided in the second exemplary embodiment according to FIGS. 3 and 4. Seen in the sliding direction of the sliding body, there are two laterally projecting sliding segments 13 and at one end on the upper side 5 14, while at the other end there are sliding segments 17 and 18 on the underside 6.
  • the sliding segments do not overlap on the top and bottom. Rather, the sliding segments 13 and 17 on the one hand and the sliding segments 14 and 18 on the other hand are at a distance from one another in the plan view of FIG. 4.
  • the sliding body is still possible against tilting or twisting about an axis which lies in the plane of the guide element 1 and perpendicular to the longitudinal extent of the slot 2.
  • the sliding body can be rotated about an axis perpendicular to the plane of the drawing in FIG. 3, namely from the limit position in FIG. 3, in which the four sliding segments bear against the guide element, a clockwise rotation is possible.
  • a tension spring 19 is provided on the underside 6, which is tensioned between two pins 20 and 21, one pin 20 being fastened to the sliding body, specifically in the top view of FIG. 4 between the sliding segments 13 and 14 lies while the other pin 21 is attached to the guide element 1.
  • This tension spring is - even if the sliding body is at one end of the elongated hole 2 at the stop, under a prestress, so that a torque acts on the sliding body, which requires tilting in the counterclockwise direction.
  • the spring 19 also acts here as a return spring, which pulls the sliding body into a limit position, which is required for applications with sensors.
  • shrinking of the plastic during curing in a direction perpendicular to the plane of the guide element does not result in contact forces that could brace the sliding segments against the guide element.
  • FIGS. 5 to 9 builds on the embodiment of FIGS. 3 and 4. It differs from the latter, however, in that a web 22, 23, 24 and 25 is formed on the sliding segments 13, 14, 17 and 18, which runs parallel to the longitudinal extent of the elongated hole 2, but is laterally offset with respect to the elongated hole so that it is in sliding contact with the top or bottom 5 or 6 of the guide element.
  • these webs are ramped, i.e. from their free end they have a slope 26 which rises in the direction of the associated sliding segment.
  • the webs 22 and 23 on the top side or the webs 24 and 25 on the bottom side converge towards one another, so that they are in a side view (FIG.
  • This embodiment is also shown with a spring 19 and pin 20, 21.
  • this spring 19 acts primarily as a return spring and only secondarily also applies a torque, as is required in the embodiment of FIGS. 3 and 4. If no return spring is required in the embodiment of FIGS. 5 to 9, the spring 19 can be omitted without further notice, without tilting or tilting of the sliding body is to be feared.
  • the entire sliding body, including the sliding segments and the webs 22 to 25 is produced in one operation as an injection molded part.
  • a further variant, not shown, relates to a modification of the exemplary embodiment in FIGS. 1 and 2.
  • two sliding segments are present on the upper side, that is to say on the side to which the actuating lever 12 is attached, and four sliding segments are present on the underside.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Adjustable Resistors (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Claims (4)

  1. Organe de réglage, en particulier pour potentiomètres linéaires, comprenant un corps coulissant (7) guidé de façon glissante dans un trou allongé (2) d'un élément de guidage (1), le corps coulissant (7) présentant, des deux côtés de l'élément de guidage (1), des segments de coulissement (13 à 18) s'étendant latéralement des deux côtés du trou allongé (2), dont les faces tournées vers l'élément de guidage (1) sont en contact de coulissement avec la face respective supérieure ou inférieure (5 ou 6) de l'élément de guidage (1), les segments de coulissement (13 à 18) étant prévus chaque fois par paires, de chaque coté de l'élément de guidage (1), et dans lequel chaque paire de segments de coulissement (13, 14; 15, 16; 17, 18) est composée de segments de coulissement (13 à 18) opposés entrez eux, par rapport à la direction longitudinale du trou allongé (2), caractérisé en ce que:
    a) le corps coulissant (7) est formé monobloc sur l'élément de guidage (1), selon la technique de moulage par injection d'une matière synthétique,
    b) l'élément de guidage (1) est un élément monobloc, et
    c) les paires de segments de coulissement (13, 14; 15, 16; 17, 18) sont décalées les unes par rapport aux autres, dans la direction longitudinale du trou allongé (2), avec une absence totale de chevauchement.
  2. Organe de réglage selon la revendication 1, caractérisé en ce que de chaque coté de l'élément de guidage n'est prévu qu'une paire de segment de coulissement (13, 14; 17, 18) et en ce qu'un ressort (19) est fixé d'un coté sur le corps de coulissement (7) et de l'autre coté sur l'élément de guidage (1) et sollicite le corps de coulissement avec un couple de rotation orienté de telle façon que les segments de coulissement (13, 14; 17, 18) soient pressés contre l'élément de guidage.
  3. Organe de réglage selon la revendication 1 ou 2, caractérisé en ce que sur chaque segment de coulissement (13, 14; 17, 18) est formée d'une façon monobloc, une nervure (22 à 25), en ce que ces nervures s'étendent parallèlement à une face (5, 6) et parallèlement à la direction longitudinale du trou allongé (2), et en ce que les nervures (22, 24 respectivement 23, 25) chevauchent au moins partiellement, d'un coté de l'élément de guidage en observant l'élément de guidage en vue de dessus, les nervures situées de l'autre cotés.
  4. Organe de réglage selon la revendication 3, caractérisé en ce que les nervures (22 à 25) montent en forme de rampe (pente 26) depuis leur extrémité libre, en direction du segment de coulissement afférent.
EP88108165A 1987-05-21 1988-05-20 Composant de réglage, en particulier pour un potentiomètre linéaire Expired - Lifetime EP0292016B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3717117 1987-05-21
DE19873717117 DE3717117A1 (de) 1987-05-21 1987-05-21 Verfahren zur herstellung eines stellgliedes, insbesondere fuer linearpotentiometer sowie nach dem verfahren hergestelltes stellglied

Publications (3)

Publication Number Publication Date
EP0292016A2 EP0292016A2 (fr) 1988-11-23
EP0292016A3 EP0292016A3 (en) 1990-06-20
EP0292016B1 true EP0292016B1 (fr) 1993-10-20

Family

ID=6328078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88108165A Expired - Lifetime EP0292016B1 (fr) 1987-05-21 1988-05-20 Composant de réglage, en particulier pour un potentiomètre linéaire

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EP (1) EP0292016B1 (fr)
DE (2) DE3717117A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3731328C1 (de) * 1987-09-17 1989-01-12 Ruf Kg Wilhelm Potentiometer und Verfahren zu dessen Herstellung
DE4428273C2 (de) * 1994-08-10 1997-06-12 Siedle Horst Kg Linearer Wegaufnehmer
DE102005028849B4 (de) 2005-06-22 2021-11-18 Kostal Automobil Elektrik Gmbh & Co. Kg Anordnung mit wenigstens zwei in ihrer Form aneinander angepaßten und linear gegeneinander beweglichen Teilen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732521A (en) * 1971-05-03 1973-05-08 Mallory & Co Inc P R Mounting means and slideable electrical contact for linear potentiometer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156804A (en) * 1962-05-31 1964-11-10 Gen Electric Slidable switch mechanism for an electric toothbrush
JPS51151753A (en) * 1975-06-20 1976-12-27 Matsushita Electric Ind Co Ltd Method of producing resin product with slide

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732521A (en) * 1971-05-03 1973-05-08 Mallory & Co Inc P R Mounting means and slideable electrical contact for linear potentiometer

Also Published As

Publication number Publication date
EP0292016A3 (en) 1990-06-20
DE3717117C2 (fr) 1991-12-05
DE3717117A1 (de) 1988-12-01
DE3884996D1 (de) 1993-11-25
EP0292016A2 (fr) 1988-11-23

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