EP0225277B1 - Electric contact device for clocks - Google Patents

Electric contact device for clocks Download PDF

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Publication number
EP0225277B1
EP0225277B1 EP86810423A EP86810423A EP0225277B1 EP 0225277 B1 EP0225277 B1 EP 0225277B1 EP 86810423 A EP86810423 A EP 86810423A EP 86810423 A EP86810423 A EP 86810423A EP 0225277 B1 EP0225277 B1 EP 0225277B1
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EP
European Patent Office
Prior art keywords
tongue
branches
contact
switch according
constituted
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
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EP86810423A
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German (de)
French (fr)
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EP0225277A1 (en
Inventor
Norbert Perucchi
Manfred Pekari
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Individual
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Individual
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/001—Electromechanical switches for setting or display
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/20—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to ring an electromechanical alarm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
    • H01H19/58—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch
    • H01H19/585—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch provided with printed circuit contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/016—Application timepiece

Definitions

  • the object of the present invention is to produce a particularly thin electrical switch which does not create disturbing torques on its axis and which is particularly intended for controlling time functions. This object is achieved according to the characterizing part of claim 1.
  • Each switch has a contact blade 1 having two branches 1 a and 1b, the two branches being provided at their ends with a contact 2.
  • the blade 1 has a hole in the center, and its central part is embedded between a mobile 3 having a toothing 4 and a barrel 5.
  • the parts 1 - 5 are mounted at a predetermined distance from a metal disc 6 illustrated diagrammatically in FIG . 3 covered with a disc of insulating material 7 inside, with the exception of an island 8 which extends radially inwards. It is clearly visible especially in fig.
  • the contact 2a is likely to come into contact with the conductive island 8 of the disc 6, while the contact 2b is always located on the insulating part 7.
  • the switch is therefore closed when the contact 2a slides. on the island 8 during the rotation of the contact blade 1 with the mobile 3 which is for example the hour wheel.
  • Fig. 2 shows the shape of the contact blade 1 without external load, that is to say before mounting.
  • Fig. 3 shows the position and shape of the contact blade after assembly of the device.
  • FIGS. 5 and 6 differs from the embodiment according to FIGS. 1 to 3 by the fact that the section of the contact blade 1 is weakened at the location of the embedding of its arms by holes 9a resp. 9b. It is accepted that the almost circular central part of the contact blade 1 is practically rigid and that the elastic deformation of the contact blade in its assembled state is practically limited to the arms. It is clear from fig. 5 that the hole 9a in the longer arm 1a is smaller than the hole 9b in the arm 1b. That is to say that the weakening of the section respectively of the moment of inertia of the blade 1a is less than the weakening of the blade 2b.
  • the solution illustrated can be provided by the introduction of a shorter blade, the friction path of which passes outside the contact 8. If the two blades have, apart from their length, all other identical characteristics, the shorter will exert, for the same deformation, a different bearing force than that of the longer. There is therefore partial compensation and the problem mentioned above is only slightly or not improved.
  • a solution valid only in a well-defined case, can be found by arranging blades of identical section in such a way that, for the nominal working conditions, the respective arrows f are different, the couples c being, themselves, identical.
  • Fig. 3 shows the contact spring of FIGS. 1 and 2 in its working position. It is noted that, due to the deformation due to the reinforcement, the points of contact with the disc may not be those which have been provided.
  • the application of formula 1 above makes it possible to theoretically trace the shapes of the deformed blades and to be convinced that, especially in the case of small thicknesses, the fulcrum can vary greatly, for small differences in total height.
  • a weakening in a given zone causes, as one can be convinced by applying formula 2, greater deformation in this zone. This deformation is all the greater as the weakening is carried out at the places where the stress is greater, the maximum being achieved for a weakening during the embedding.
  • a contact blade could be provided with more than two arms, but symmetrical in the sense that total compensation for the torques acting on the axis is obtained.
  • the branch section weakening or shrinking can be achieved by other measures.
  • circular holes it is advantageous to provide oblong holes situated substantially in the middle of the width of the branches. It is also possible to provide for narrowing by reducing the thickness of the blade in the vicinity of the embedding.

Description

La réalisation d'interrupteurs électriques commandés par un appareil miniaturisé, montre-bracelet en particulier, pose certains problèmes, de frottement, énergétique et de dimensionnement en particulier. Une réalisation classique et plate par une lame (droite ou en spirale) est simple mais insuffisante en fiabilité parce qu'étant créatrice de couples et de frottements parasites et provoquant une consommation d'énergie prohibitive vis-à-vis des sources d'énergie à disposition (pile).The production of electrical switches controlled by a miniaturized device, a wristwatch in particular, poses certain problems, in terms of friction, energy and sizing in particular. A conventional and flat realization by a blade (straight or spiral) is simple but insufficient in reliability because being creator of couples and parasitic friction and causing a prohibitive energy consumption with respect to the energy sources to disposal (stack).

On connaît déjà des interrupteurs électriques selon le préambule de la revendication 1 (GB-A 456 625). Cependant les interrupteurs connus de ce type ne donnent pas entièrement satisfaction pour des raisons qui seront expliquées ci-dessous.Electric switches are already known according to the preamble of claim 1 (GB-A 456 625). However, known switches of this type are not entirely satisfactory for reasons which will be explained below.

La présente invention a pour but la réalisation d'un interrupteur électrique particulièrement mince ne créant pas de couples perturbateurs sur son axe et destiné particulièrement à la commande de fonctions horaires. Ce but est atteint selon la partie ca- ractérisante de la revendication 1.The object of the present invention is to produce a particularly thin electrical switch which does not create disturbing torques on its axis and which is particularly intended for controlling time functions. This object is achieved according to the characterizing part of claim 1.

L'invention sera expliquée en détail ci-après à l'aide des dessins dans lesquels

  • les fig. 1 à 3 représentent un interrupteur de réalisation connue, et ces figures servent à expliquer les inconvénients d'un tel interrupteur,
  • la fig. 4 est un diagramme servant à expliquer les phénomènes de déformation des bras de la lame de contact et
  • les fig. 5 et 6 sont des figures correspondantes aux fig. 1 et 3, mais qui représentent, à titre d'exemple, une forme d'exécution selon l'invention.
The invention will be explained in detail below with the aid of the drawings in which
  • fig. 1 to 3 represent a switch of known embodiment, and these figures serve to explain the drawbacks of such a switch,
  • fig. 4 is a diagram used to explain the phenomena of deformation of the arms of the contact blade and
  • fig. 5 and 6 are figures corresponding to FIGS. 1 and 3, but which represent, by way of example, an embodiment according to the invention.

Les éléments des interrupteurs représentés dans les fig. 1 à 3, respectivement les fig. 5 et 6 sont désignées par les mêmes chiffres de référence. Chaque interrupteur présente une lame de contact 1 ayant deux branches 1 a et 1b, les deux branches étant munies à leurs extrémités d'un contact 2. La lame 1 présente un trou au centre, et sa partie centrale est encastrée entre un mobile 3 présentant une denture 4 et un canon 5. Dans l'état assemblé de l'appareil, par exemple de la montre-bracelet électronique, les parties 1 - 5 sont montées à une distance prédéterminée par rapport à un disque métallique 6 illustré schématiquement dans la fig. 3 recouvert d'un disque en matière isolante 7 à l'intérieur, à l'exception d'un îlot 8 qui s'étend radialement vers l'intérieur. Il est clairement visible surtout de la fig. 1 que le bras 1 a est plus long que le bras 1 b c'est-à-dire que l'élongation du contact 2a de l'axe A de l'interrupteur est plus grande que la distance du contact 2b. C'est ainsi que le contact 2a est susceptible d'entrer en contact avec l'îlot conducteur 8 du disque 6, tandis que le contact 2b se trouve toujours sur la partie isolante 7. L'interrupteur est donc fermé lorsque le contact 2a glisse sur l'îlot 8 lors de la rotation de la lame de contact 1 avec le mobile 3 qui est par exemple la roue des heures.The elements of the switches shown in fig. 1 to 3, respectively fig. 5 and 6 are designated by the same reference numerals. Each switch has a contact blade 1 having two branches 1 a and 1b, the two branches being provided at their ends with a contact 2. The blade 1 has a hole in the center, and its central part is embedded between a mobile 3 having a toothing 4 and a barrel 5. In the assembled state of the device, for example of the electronic wristwatch, the parts 1 - 5 are mounted at a predetermined distance from a metal disc 6 illustrated diagrammatically in FIG . 3 covered with a disc of insulating material 7 inside, with the exception of an island 8 which extends radially inwards. It is clearly visible especially in fig. 1 that the arm 1 a is longer than the arm 1 b, that is to say that the elongation of the contact 2a of the axis A of the switch is greater than the distance of the contact 2b. Thus, the contact 2a is likely to come into contact with the conductive island 8 of the disc 6, while the contact 2b is always located on the insulating part 7. The switch is therefore closed when the contact 2a slides. on the island 8 during the rotation of the contact blade 1 with the mobile 3 which is for example the hour wheel.

La fig. 2 représente la forme de la lame de contact 1 sans charge extérieure, c'est-à-dire avant le montage. La fig. 3 représente la position et la forme de la lame de contact après assemblage de l'appareil.Fig. 2 shows the shape of the contact blade 1 without external load, that is to say before mounting. Fig. 3 shows the position and shape of the contact blade after assembly of the device.

La forme d'exécution selon l'invention, représentée sur les fig. 5 et 6 se distingue de la réalisation selon les fig. 1 à 3 par le fait que la section de la lame de contact 1 est affaiblie à l'endroit de l'encastrement de ses bras par des trous 9a resp. 9b. Il est admis que la partie centrale quasi circulaire de la lame de contact 1 soit pratiquement rigide et que la déformation elastique de la lame de contact dans son état assemblé se limite pratiquement aux bras. Il ressort clairement de la fig. 5 que le trou 9a du bras 1 a plus long est plus petit que le trou 9b dans le bras 1 b. C'est-à-dire que l'affaiblissement de la section respectivement du moment d'inertie de la lame 1 a est inférieure à l'affaiblissement de la lame 2b.The embodiment according to the invention, shown in FIGS. 5 and 6 differs from the embodiment according to FIGS. 1 to 3 by the fact that the section of the contact blade 1 is weakened at the location of the embedding of its arms by holes 9a resp. 9b. It is accepted that the almost circular central part of the contact blade 1 is practically rigid and that the elastic deformation of the contact blade in its assembled state is practically limited to the arms. It is clear from fig. 5 that the hole 9a in the longer arm 1a is smaller than the hole 9b in the arm 1b. That is to say that the weakening of the section respectively of the moment of inertia of the blade 1a is less than the weakening of the blade 2b.

On expliquera et comparera les phénomènes de déformation des lames de contact représentées à l'aide de la fig. 4.We will explain and compare the deformation phenomena of the contact blades shown using fig. 4.

Lorsqu'une lame encastrée à une extrémité est sollicitée à l'autre, les formules élémentaires de la résistance des matériaux permettent de calculer en fonction de la sollicitation P:

  • - la forme de la lame fléchie par la formule
    Figure imgb0001
  • - la flexion maximum à l'extrémité x =
    Figure imgb0002
    où
    • I: moment d'inertie de la section droite de la lame.
    • E: module d'élasticité de la lame.
When a blade embedded at one end is stressed at the other, the elementary formulas of the resistance of the materials make it possible to calculate as a function of the stress P:
  • - the shape of the blade bent by the formula
    Figure imgb0001
  • - maximum bending at the end x =
    Figure imgb0002
     or
    • I: moment of inertia of the straight section of the blade.
    • E: modulus of elasticity of the blade.

On constate donc que, toutes autres caractéristiques égales, pour une flèche f identique une lame courte devra être sollicitée plus fortement qu'une lame longue.It is therefore found that, all other characteristics being equal, for an identical deflection f a short blade will have to be stressed more strongly than a long blade.

Il est évident que, sous l'action de la force P d'appui de la lame, il se crée sur les deux pièces (mobile et disque) un couple C, sollicitant ces mobiles dans le plan de leur axe, qui peut être la cause de mauvais fonctionnements. Afin d'éliminer cet inconvénient, il paraît judicieux de rendre le dispositif symétrique en compensant le couple C par un autre couple antagoniste, dû à une lame opposée.It is obvious that, under the action of the force P of support of the blade, a couple C is created on the two parts (mobile and disc), urging these mobile in the plane of their axis, which can be the because of malfunctions. In order to eliminate this drawback, it seems advisable to make the device symmetrical by compensating for the torque C with another opposing torque, due to an opposite blade.

Dans le but de ne pas doubler le nombre de contacts par tour et afin de ne pas devoir isoler la deuxième lame, la solution illustré peut être apportée par l'introduction d'une lame plus courte, dont le chemin de frottement passe en dehors du contact 8. Si les deux lames ont, à part leur longueur, toutes les autres caractéristiques identiques, la plus courte exercera, pour une même déformation, une force d'appui différente que celle de la plus longue. Il y a donc compensation partielle et le problème mentionné ci-dessus n'est que peu ou pas amélioré.In order not to double the number of contacts per revolution and so as not to have to isolate the second blade, the solution illustrated can be provided by the introduction of a shorter blade, the friction path of which passes outside the contact 8. If the two blades have, apart from their length, all other identical characteristics, the shorter will exert, for the same deformation, a different bearing force than that of the longer. There is therefore partial compensation and the problem mentioned above is only slightly or not improved.

Une solution, valable uniquement dans un cas bien défini, peut être trouvée en agençant des lames de section identique de telle façon que, pour les conditions nominales de travail les flèches f respectives soient différentes, les couples c étant, eux, identiques.A solution, valid only in a well-defined case, can be found by arranging blades of identical section in such a way that, for the nominal working conditions, the respective arrows f are different, the couples c being, themselves, identical.

Cette solution ne résoud le problème que dans le cas particulier des conditions d'emploi nominales car si, de par les tolérances de fabrication, la distance mobile-disque venait à changer, les forces d'appui P varieraient différemment.This solution only solves the problem in the particular case of nominal conditions of use because if, by manufacturing tolerances, the mobile-disc distance were to change, the support forces P would vary differently.

La solution idéale apportant par ailleurs un autre avantage non négligeable, comme on le verra ci-dessous, consiste à affaiblir les deux lames de façon différente aux endroits où la sollicitation, donc la déformation, est maximum.The ideal solution bringing in addition another non-negligible advantage, as will be seen below, consists in weakening the two blades differently in the places where the stress, therefore the deformation, is maximum.

La Fig. 3 représente le ressort de contact des Fig. 1 et 2 dans sa position de travail. On constate que, du fait de la déformation due à l'armage, les points de contact avec le disque peuvent ne pas être ceux qui ont été prévus. L'application de la formule 1 ci-dessus permet de tracer théoriquement les formes des lames déformées et de se convaincre que, dans le cas de faibles épaisseurs surtout, le point d'appui peut varier fortement, pour de petites différences de hauteur totale.Fig. 3 shows the contact spring of FIGS. 1 and 2 in its working position. It is noted that, due to the deformation due to the reinforcement, the points of contact with the disc may not be those which have been provided. The application of formula 1 above makes it possible to theoretically trace the shapes of the deformed blades and to be convinced that, especially in the case of small thicknesses, the fulcrum can vary greatly, for small differences in total height.

Un affaiblissement dans une zone donnée provoque, comme on peut s'en convaincre en appliquant la formule 2, une déformation plus grande dans cette zone. Cette déformation est d'autant plus grande que l'affaiblissement est réalisé aux endroits où la sollicitation est plus grande, le maximum étant réalisé pour un affaiblissement à l'encastrement.A weakening in a given zone causes, as one can be convinced by applying formula 2, greater deformation in this zone. This deformation is all the greater as the weakening is carried out at the places where the stress is greater, the maximum being achieved for a weakening during the embedding.

Il est donc possible de réaliser un ressort de contact (fig. 5 et 6) dont les deux lames sont affaiblies différemment dans les zones d'encastrement respectives, par exemple par deux trous de diamètre différent comme représenté sur la fig. 4. Ces affaiblissements sont dimensionnés à l'aide des formules 1 et 2, d'une part de façon telle que la presque totalité de la déformation se produise dans ces zones. Le point d'appui reste ainsi parfaitement défini quelle que soit la déformation, comme représenté sur la fig. 6.It is therefore possible to produce a contact spring (fig. 5 and 6), the two blades of which are weakened differently in the respective embedding zones, for example by two holes of different diameter as shown in fig. 4. These attenuations are dimensioned using formulas 1 and 2, on the one hand in such a way that almost all of the deformation occurs in these zones. The fulcrum thus remains perfectly defined whatever the deformation, as shown in FIG. 6.

D'autre part, en dimensionnant ces affaiblissements de façon judicieusement différente, on peut réaliser l'égalité des forces d'appui ou compenser les couples parasites.On the other hand, by dimensioning these attenuations judiciously differently, it is possible to achieve equality of the support forces or to compensate for the parasitic torques.

Il va de soi que l'affaiblissement doit être calculé de manière que les tensions maximum admissibles par le matériau constituant les lames ne soient pas dépassées.It goes without saying that the attenuation must be calculated so that the maximum allowable voltages by the material of which the blades are made are not exceeded.

Il existe plusieurs variantes possibles de la forme d'exécution représentée. On pourrait prévoir une lame de contact avec plus que deux bras mais sym- métrique dans ce sens qu'une compensation totale des couples agissant sur l'axe est obtenue. L'affaiblissement ou retrécissement de section des branches peut être réalisé pas d'autres mesures. On peut, par exemple, affaiblir les bras par des encoches extérieures symmétriques. Au lieu de trous circulaires on peut avantageusement prévoir des trous oblongs situés sensiblement au milieu de la largeur des branches. Il est également possible de prévoir des rétrécissements par réduction de l'épaisseur de la lame au voisinage des encastrement.There are several possible variants of the embodiment shown. A contact blade could be provided with more than two arms, but symmetrical in the sense that total compensation for the torques acting on the axis is obtained. The branch section weakening or shrinking can be achieved by other measures. One can, for example, weaken the arms by symmetrical external notches. Instead of circular holes, it is advantageous to provide oblong holes situated substantially in the middle of the width of the branches. It is also possible to provide for narrowing by reducing the thickness of the blade in the vicinity of the embedding.

L'invention n'est pas obligatoirement limitée à la définition donnée dans les revendications. N'importe quelle combinaison d'éléments de la forme d'exécution représentée et des variantes mentionnées peuvent être considérées comme étant l'invention.The invention is not necessarily limited to the definition given in the claims. Any combination of elements of the embodiment shown and variants mentioned may be considered to be the invention.

Claims (6)

1. An electric switch comprising a circular flat and thin contact susceptible to turn round an axis, constituted by a disk (6) partially isolated and by at least one tongue sliding on and applied against said disk, this tongue comprising at least two branches (1a, 1b) applying on the disk at different radii, characterized in that the branches of the tongue have, near their embedding, a contraction of the section in such a way that when they are in operating position their profiles are substantially straight lines and the resultant of the torques tending to induce rotations in planes comprising the axis (A) is substantially zero.
2. Switch according to claim 1, characterized in that the contractions of the section of the branches (1a, 1b) are constituted by holes (9a, 9b) located substantially in the middle of the width of the branches.
3. Switch according to claim 1, characterized in that the restrictions of the section of the branches are constituted by an oblong aperture located substantially in the middle of the width of the branches.
4. Switch according to claim 1, characterized in that the restrictions are constituted by reductions of the thickness of the tongue near the embedding.
5. Switch according to claim 2, characterized in that said apertures (9a, 9b) consist of circular cuttings, the one (9b) of the extension (9b) having a diameter slightly greater than the one (9a) of the part (1 a) of the tongue carrying the contact (2a).
6. Use of the switch according to claim 1 in a wrist watch comprising a device capable to start up operation by the closure of this switch at a time selectable volountarily, said disc and said tongue being both mounted rotatively round the same axis, one of these two pieces being fixed to a member indicating the time of starting up operation of said device and the other being fixed to an hour wheel of the watch for being rotatively driven by said wheel, the disc being isolated on the path of the contact carried by said tongue except for the place of the contact it carries.
EP86810423A 1985-10-04 1986-09-26 Electric contact device for clocks Expired EP0225277B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4311/85 1985-10-04
CH431185 1985-10-04

Publications (2)

Publication Number Publication Date
EP0225277A1 EP0225277A1 (en) 1987-06-10
EP0225277B1 true EP0225277B1 (en) 1989-11-23

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EP86810423A Expired EP0225277B1 (en) 1985-10-04 1986-09-26 Electric contact device for clocks

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US (1) US4780583A (en)
EP (1) EP0225277B1 (en)
DE (1) DE3667112D1 (en)
HK (1) HK108390A (en)

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1739003A (en) * 1927-12-06 1929-12-10 Addison R Klingensmith Combination lock switch
US1820937A (en) * 1928-01-09 1931-09-01 Mildred M Daniels Burglar alarm switch device
DE638269C (en) * 1934-05-30 1936-11-12 Siemens & Halske Akt Ges Rotary switch, especially for measuring purposes, with a fixed axis and a supporting body that can be rotated about this for pantographs sliding on flat contact tracks
GB456625A (en) * 1935-02-19 1936-11-12 Cinch Mfg Corp Improvements in and relating to electrical switches of the selector type
US2079003A (en) * 1936-07-08 1937-05-04 Dewar Mfg Company Electric switch device
US2340615A (en) * 1942-03-20 1944-02-01 Radio Patents Corp Snap action device
US2701475A (en) * 1950-04-17 1955-02-08 Honeywell Regulator Co Snap acting device
US3024334A (en) * 1958-09-12 1962-03-06 Hurletron Inc Ball contacting device
DE1215800B (en) * 1960-11-11 1966-05-05 Joseph Gisiger Staehli Control unit
GB1200889A (en) * 1966-12-09 1970-08-05 Lucas Industries Ltd Means for making an electrical connection to a flexible printed circuit
US3611702A (en) * 1969-05-08 1971-10-12 Paolo Spadini Electric alarm timepiece
US3801753A (en) * 1969-06-17 1974-04-02 Gaf Corp Dial type wafer printed circuit switch
GB1391637A (en) * 1971-12-27 1975-04-23 Suwa Seikosha Kk Electronic timepieces and electronic calculators
JPS5246123Y2 (en) * 1972-06-09 1977-10-20
US3869586A (en) * 1974-03-28 1975-03-04 Cutter Hammer In Miniature wrist watch switch
US3970986A (en) * 1975-01-30 1976-07-20 Motorola, Inc. Thick film rotary switch
US4199930A (en) * 1978-01-19 1980-04-29 The Gillette Company Alarm switch for an alarm circuit in a horological device
US4400597A (en) * 1982-02-16 1983-08-23 Eeco Incorporated Axial cam rotary switch

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HK108390A (en) 1990-12-28
EP0225277A1 (en) 1987-06-10
US4780583A (en) 1988-10-25
DE3667112D1 (en) 1989-12-28

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