EP0100936B1 - Interrupteur à bouton poussoir - Google Patents

Interrupteur à bouton poussoir Download PDF

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Publication number
EP0100936B1
EP0100936B1 EP83107108A EP83107108A EP0100936B1 EP 0100936 B1 EP0100936 B1 EP 0100936B1 EP 83107108 A EP83107108 A EP 83107108A EP 83107108 A EP83107108 A EP 83107108A EP 0100936 B1 EP0100936 B1 EP 0100936B1
Authority
EP
European Patent Office
Prior art keywords
switch
push button
differential path
button switch
slide
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
Application number
EP83107108A
Other languages
German (de)
English (en)
Other versions
EP0100936A2 (fr
EP0100936A3 (en
Inventor
Günter Dipl.-Ing. Murmann
Günter Bauer
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.)
ZF Electronics GmbH
Original Assignee
Cherry Mikroschalter GmbH
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 Cherry Mikroschalter GmbH filed Critical Cherry Mikroschalter GmbH
Priority to AT83107108T priority Critical patent/ATE48494T1/de
Publication of EP0100936A2 publication Critical patent/EP0100936A2/fr
Publication of EP0100936A3 publication Critical patent/EP0100936A3/de
Application granted granted Critical
Publication of EP0100936B1 publication Critical patent/EP0100936B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
    • H01H15/02—Details
    • H01H15/06—Movable parts; Contacts mounted thereon
    • H01H15/10—Operating parts
    • H01H15/102—Operating parts comprising cam devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H2001/0005—Redundant contact pairs in one switch for safety reasons

Definitions

  • the invention relates to a key switch with at least one contact piece fixed in a base and a U-shaped contactor whose contact-side end can be resiliently pivoted from one switching position into another switching position by means of at least one key cam of a key tappet supported on a return spring.
  • Such key switches are well known in a versatile design and in use. For modern input keyboards of electronic systems and in particular for typing keyboards of computer-controlled typing systems, key switches in such a flat design are required that the keyboard has a maximum height of about 30 mm in the third row of keys according to a currently required standard. Key switches, which are suitable for the construction of such a keyboard, should on the one hand be extremely stable with a very long service life and fully automatic mountability and on the other hand have a tactile pressure point immediately before the contact is closed in the interest of a safe switching function. It is necessary that with a usual key stroke of about 4 mm a difference between the switch point and the switch back point, i. H. a hysteresis behavior is guaranteed and that the switch can be mass-produced very inexpensively.
  • the key tappet is divided into a tappet part and a differential path part, that the differential path part is pushed onto catches arranged on the tappet part and can be freely moved between an upper and lower end position, that the differential path part is displaced by a mechanical at the initial displacement of the tappet part Movement inhibition initially maintains its rest position until the differential path part assumes the upper end position relative to the plunger part and that the plunger part moves together with the differential path part after the initial displacement, the at least one button cam located on the differential path part actuating the contactor.
  • the differential path part is held in the rest position by the catches on the tappet part in the uppermost position. If the plunger section is pressed down when the button switch is pressed, it can initially move freely within the differential travel section until it stops on the top of the differential travel section and takes the differential travel section down with it. Since the at least one key cam rests under pressure on the contactor and the differential path part experiences mechanical movement inhibition, the differential path part remains in its uppermost position until the plunger part takes it down due to a mechanical stop. Only by moving the differential path part can the contactor move along the switch slope of the key cam to actuate the switch. When the button is released, the tappet part is returned by a spiral compression spring, with its catches reaching under the differential travel part and returning it to the rest position with upward.
  • An advantageous embodiment of the invention provides that the catches on the tappet part are designed as hook-shaped tabs, each with a projecting stop shoulder, and that the tabs run in a guide groove in the differential travel part, the stop shoulders engaging under a stop edge on the differential travel part.
  • the provision of guide grooves for the hook-shaped tabs ensures that the differential path part can only move in the actuation direction of the key, so that transverse moments or eccentric moments cannot trigger premature entrainment of the differential path part, which would impair the desired switching function.
  • the differential path part is provided with a central bore through which a guide pin engaging in a guide sleeve in the base and two hook-shaped tabs lying on both sides of the guide pin extend, the respective stop shoulder of which engages under the edge of the differential path part in the region of the guide grooves.
  • the mechanical movement inhibition for the differential path part is brought about by the button cams which are in pre-tension on the contactor in the rest position. This force with which the contact spring rests on the key cam thus requires an increased actuation force shortly before the switching point, which creates a pressure point feeling.
  • the differential path part is provided with at least one plastic spring, which rests on the inside of the cover of the key switch.
  • a further embodiment also provides that a spiral compression spring that biases the key switch into the rest position engages over the guide sleeve in the base and between the hook-shaped tabs over the guide pin on the plunger part. This ensures that the return force of the spiral compression spring can only act on the differential travel part via the tappet part.
  • the invention provides that a cutout is made on the underside of the key cam, which engages in a corresponding recess on the contact piece when the key tappet is pressed .
  • lateral guide ribs between which a guide projection encompassing the plastic spring engages.
  • These lateral guide ribs can be designed to extend into the cover over the upper edge of the base, which also simplifies the assembly of the switch and, in particular, automatic assembly.
  • the tappet part is provided with a cover plate which is guided in a corresponding cutout in the cover. Since this cover plate lies on the surface of the differential path part over a large area when the key switch is actuated, it is ensured that the differential path part cannot tilt when it is moved downward.
  • the key switch shown in FIG. 1 consists of a base 10, which is closed with a cover 11. Inside the key switch, a key plunger is slidably attached, which consists of a plunger part 12 and a differential path part 13. The ram part 12, as will be explained in more detail below, snapped into the differential travel part 13. On the underside of the plunger part 12, a guide pin 14 is attached, which engages in a guide sleeve 15, which is formed in the central region of the base 10 upwards.
  • This guide sleeve 15 also serves as a holding pin for a spiral compression spring 16 which is pushed outside over the guide sleeve and rests with its upper end on the underside of a cover plate 17 of the tappet part 12. With the help of the guide sleeve 15, on the one hand, the tappet part 12 is guided during the actuation of the button, the spiral compression spring being secured against lateral displacement at the same time.
  • the contactor 20 consists of a U-shaped contact spring material and carries at the end of one leg a solder tail 22 which is inserted through a corresponding opening in the base of the base 11.
  • the leg carrying the soldering lug runs parallel to the inner wall of the base 10.
  • the free contact end 23 of the other leg of the U-shaped bent contact 20 lies inside the base 10, opposite the contact piece 21 which is also inserted into the base and of which a soldering lug 24 protrudes downwards from the base.
  • the contactor 20 is biased such that the crossbar contacts 25 attached to the contact piece and at the contact end rest on one another when the contactor is not lifted by the action of the key tappet.
  • the contactor can be partially separated by a slot 26, wherein the slot at the contact-side end can be continuous, as indicated by dashed lines, in order to obtain a double contact.
  • crossbar contacts are attached to both free contact ends, which work together with corresponding elements on the contact piece.
  • the U-shaped contactor protrudes with its base into a corresponding recess 27 in the cover 11.
  • the U-shaped contact 20, which is open at the bottom, can thus be in a certain range with respect to the length of the legs without having to change the position of the contact plane can be varied, it being possible to achieve a relatively large spring length with reduced spring stiffness if the contactors project fully into the recess 27.
  • the contactor 20 is folded twice at the contact end, whereby a sliding edge is obtained which slides along the feeler cam 30 of the differential path part 13.
  • the sliding edge merges on both sides of the contact end into a sliding vane 31, which is the actual part of the contactor which bears against the probe cam and runs along it.
  • the differential path part 13 consists of a frame with a central bore 35 which is expanded in the direction of the two narrow sides of the frame by a guide groove 36.
  • the key cams 30 are attached at a distance which corresponds to the distance between the sliding tabs 31 on the contactor 20.
  • the key cams rest with a vertically extending section 37 on the sliding edge of the sliding lugs 31, the crossbar contacts being lifted off.
  • the sliding edge of the associated sliding vane moves first along the vertical section 37 and then along one inwardly extending bevel 38, whereby the contact rail contacts 25 can come into contact with each other.
  • the pressing force with which the contactor 20 rests on the section 37 brings about a pressure point feeling due to the increased actuating force during the initial displacement of the differential path part 13.
  • the contact piece is inserted into the base 10 such that it is held on one side in the wall of the base. So that the contact end of the contactor 20 can be attached as deeply as possible, on the one hand the contact piece 21 is provided with a recess 40 and on the other hand the associated key cam 30 is provided with a cutout 41.
  • hook-shaped tabs 45 On the tappet part 12 of the key tappet hook-shaped tabs 45 are attached which extend downward from the cover plate 17 and which are provided at the lower end with an outwardly projecting stop shoulder 46. These hook-shaped tabs are located on both sides of the guide pin 14, specifically outside the spiral compression spring 16 which grips over the guide pin. The size and position of these hook-shaped tabs 45 correspond to the guide grooves 36 in the differential path part 13, the stop shoulders engaging under a stop edge on the differential path part when the Ram part is inserted in the differential path part.
  • the hook-shaped tabs 45 are sufficiently elastic so that they can be compressed when inserting the tappet part 12 into the differential path part 13 until they engage with their stop shoulder under the edge of the differential path part designed as a stop edge. In the locked state, the differential path part 13 is easily displaceable on the hook-shaped tabs 45 between an upper and a lower end position.
  • the assignment of the tappet part 12 and the differential travel part 13 in a closed key switch is shown in FIG. 2.
  • the plunger part 12 is shifted into its upper end position with the aid of the spiral compression spring 16 and rests with the stop shoulders 46 of the hook-shaped tab 45 on a stop edge located on the underside of the differential travel part.
  • the differential path part 13 is also, as is apparent from FIG. 1, provided on its opposite narrow end faces with a guide projection 47.
  • a plastic spring 48 is formed which, as can be seen from FIG. 2, rests on the inner surface of the base 10 in a sliding manner. With the help of this plastic spring 48, a mechanical movement inhibition for the differential path part can be created, which acts in addition to the key cams which are in pre-tensioned condition at the contactor.
  • the key switch according to the construction according to FIG. 1 offers the possibility of providing two mutually independent contact sets, as is shown in FIG. 1 by the contact set used and the explosively drawn out contact set.
  • the functionality of the key switch is not affected in any way if it is only provided with a single key set. Since the guide path 47 between lateral ribs 50 in the base 10 of the differential path part is additionally protected both against twisting and against tilting. By extending the guide ribs 50 beyond the upper edge of the base 10, the assembly is considerably simplified, in particular in the case of an automatic assembly, since no additional positioning aids are required for inserting the tappet part snapped into the differential path part.
  • FIGS. 3A to 3C taking into account the details from FIG. 1.
  • the rest position and the switching position can also be seen in FIGS. 4A and 4B.
  • the key switch In the idle state, the key switch is biased by the spiral compression spring 16 in its uppermost position indicated in FIGS. 3A and 4A.
  • the stop shoulder 46 bears against the stop edge at the lower edge of the differential path part 13 and moves the differential path part up to the stop on the cover 11. In this position, the sliding edges of the contactor 20 rest on the vertically extending sections 37 of the key cams 30. The contacts are tensioned and the crossbar contacts are opened.
  • the key plunger 12 initially moves downward against the force of the spiral compression spring 16, but the differential travel part 13 is still held in its rest position by the mechanical movement inhibition due to the sections 37 abutting the contactor, as can be seen from FIG. 3B .
  • the mechanical movement inhibition is supported by the plastic springs 48 if such are provided on the differential path part.
  • the plunger part 12 comes to a stop on the surface of the differential travel part and moves it downward against the movement inhibition, the sliding edge on the contactor sliding upwards via the switching slope 38 and releasing the contact. Due to the mechanical movement inhibition, the entrainment of the differential travel part 13 can be determined as an increase in the key press, which achieves the function of a pressure point.
  • the key tappet 12 moves upwards by the pressure of the spiral compression spring 16 and comes with the stop shoulder 46 against the stop edge on the underside of the differential path part 13 and takes the differential path part 13 upwards into the position shown in FIG. 3A.
  • the difference path is essentially determined by the distance of the stop shoulder 46 from the stop edge on the underside of the difference path part.
  • FIG. 1 A force-displacement diagram is shown in FIG.
  • the compression spring 16 When the tappet part 12 is pressed, the compression spring 16 is tensioned, the actuating force initially increasing linearly. From the moment the differential travel part 13 is taken along, the actuating force rises steeply until the frictional force between the contactor 20 and the sensing cam 30 is overcome. While the sliding flag 31 is sliding along section 37, the actuating force continues to increase linearly until the sliding flag merges into the bevel 38.
  • a projection of low height is attached to the transition from section 37 into the bevel 38, the perceptibility of the pressure point can be increased.
  • This elevation can be carried out in such a way that the vertically extending section 37 is changed into a section which rises slightly obliquely towards the front, the highest height being in the transition of this section into the switching slope.

Claims (11)

1. Interrupteur à bouton-poussoir avec au moins une pièce de contact (21) fixée dans un socle (10) et un contacteur (20) en forme de U, dont l'extrémité côté contact peut être pivotée élastiquement au moyen d'au moins une came (30) d'un poussoir (12, 13) soutenu par un ressort spiral de compression (16), d'une position de commutation à une autre position de commutation, caractérisé en ce que, le poussoir est subdivisé en une partie de poussoir (12) et une partie de parcours différentiel (13), la partie de parcours différentiel (13) est poussée sur des crans d'arrêt (45, 46) placés sur la partie de poussoir (12) et est librement mobile entre une position extrême supérieure et une inférieure, la partie de parcours différentiel (13) conserve d'abord sa position de repos, au début du déplacement de la partie de poussoir (12), par un arrêt mécanique, jusqu'à ce que la partie de poussoir vienne buter contre la partie de parcours différentiel, et la partie de poussoir, après le début du déplacement, continue à se déplacer avec la partie de parcours différentiel, et ainsi la au moins une came (30) se trouvant sur la partie de parcours différentiel actionne le contacteur (20).
2. Interrupteur à bouton-poussoir selon la revendication 1, caractérisé en ce que, les crans d'arrêt sur la partie de poussoir sont configurés comme des attaches (45) en forme de crochet a chaque fois avec un épaulement de butée (46) qui dépasse, et les attaches se déplacent dans une rainure de guidage (36) de la partie de parcours différentiel (13), les épaulements de butée (46) passant sous une arête de butée vers la partie de parcours différentiel (13).
3. Interrupteur à bouton-poussoir selon la revendication 1 ou 2, caractérisé en ce que, la partie de parcours différentiel (13) est pourvue d'un perçage central (35) à travers lequel passent un tourillon de guidage (14) s'insérant dans un manchon à ressort (15) dans le socle (10) et les deux attaches (45) en forme de crochet se trouvant des deux côtés du tourillon de guidage, et les épaulements de butée (46) passent sous le bord de la partie de parcours différentiel (13) dans la zone des rainures de guidage (36).
4. Interrupteur à bouton-poussoir selon les revendications 1 à 3, caractérisé en ce que, l'arrêt mécanique est effectué par les cames (30) s'appuyant, en position de repos, sur le contacteur (20) avec tension préalable.
5. Interrupteur à bouton-poussoir selon la revendication 4, caractérisé en ce que, la partie de parcours différentiel (13) est pourvue d'au moins un ressort en matière synthétique (48) qui repose sur le côté interne du couvercle (11) de l'interrupteur à bouton-poussoir.
6. Interrupteur à bouton-poussoir selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, le socle (10) est pourvu, sur ses côtés opposés, de deux nervures latérales de guidage (50) , entre lesquelles s'insère une saillie de guidage (47) contenant le ressort en matière synthétique (48).
7. Interrupteur à bouton-poussoir selon la revendication 6, caractérisé en ce que, les nervures latérales de guidage (50) passent sur le bord du socle dans le couvercle (11) de l'interrupteur à bouton-poussoir.
8. Interrupteur à bouton-poussoir selon l'une quelconque des revendications 1 à 7, caractérisé en ce que, le ressort spiral à compression (16) mettant l'interrupteur à bouton-poussoir sous tension préalable à sa position de repos passe sur le manchon de guidage (15) dans le socle et entre les attaches (45) en forme de crochet sur le tourillon de guidage (14).
9. Interrupteur à bouton-poussoir selon l'une quelconque des revendications 1 à 8, caractérisé en ce que, au-dessous de la came est prévue une découpe (41), qui s'insère dans un évidement correspondant (40) sur la pièce de contact (21), lorsque le poussoir (12) est pressé.
10. Interrupteur à bouton-poussoir selon l'une quelconque des revendications 1 à 9, caractérisé en ce que, la partie de poussoir (12) est pourvue d'une plaque de couverture (17) qui est guidée dans une découpe correspondante dans le couvercle (11).
EP83107108A 1982-08-06 1983-07-20 Interrupteur à bouton poussoir Expired EP0100936B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83107108T ATE48494T1 (de) 1982-08-06 1983-07-20 Tastenschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823229465 DE3229465A1 (de) 1982-08-06 1982-08-06 Tastenschalter
DE3229465 1982-08-06

Publications (3)

Publication Number Publication Date
EP0100936A2 EP0100936A2 (fr) 1984-02-22
EP0100936A3 EP0100936A3 (en) 1987-01-07
EP0100936B1 true EP0100936B1 (fr) 1989-12-06

Family

ID=6170335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107108A Expired EP0100936B1 (fr) 1982-08-06 1983-07-20 Interrupteur à bouton poussoir

Country Status (6)

Country Link
US (1) US4467160A (fr)
EP (1) EP0100936B1 (fr)
JP (1) JPS59146113A (fr)
KR (1) KR890005313B1 (fr)
AT (1) ATE48494T1 (fr)
DE (1) DE3229465A1 (fr)

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US3993884A (en) * 1972-09-15 1976-11-23 Victor Comptometer Corporation Detachably mounted keyboard pushbutton actuators and housing assembly
DE2417280A1 (de) * 1973-04-09 1974-10-24 Alphameric Holdings Ltd Tastatur zur erzeugung elektrischer signale
JPS5018972U (fr) * 1973-06-15 1975-03-03
DE7502213U (de) * 1975-01-25 1976-01-29 Triumph Werke Nuernberg Ag, 8500 Nuernberg Tastschalter
JPS5267975U (fr) * 1975-11-14 1977-05-19
SE402654B (sv) * 1976-12-21 1978-07-10 Ericsson Telefon Ab L M Tryckknappsomkopplare for anvendning vid pa ett kretskort anordnade stromkretsar
DE7825679U1 (de) * 1978-08-29 1978-12-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen Tastschalter, insbesondere für Fernsprechgeräte
DE2943855C2 (de) * 1979-10-30 1982-10-21 Siemens AG, 1000 Berlin und 8000 München Drucktaste
US4361743A (en) * 1981-03-06 1982-11-30 Stackpole Components Company Lost motion keyswitch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203120C2 (de) * 1992-02-04 2001-09-27 Cherry Mikroschalter Gmbh Flacher Tastschalter
DE102013205580A1 (de) 2013-03-28 2014-10-02 Zf Friedrichshafen Ag Tastenstößel für ein Tastenmodul einer Taste für eine Tastatur, Tastenmodul einer Taste für eine Tastatur und Verfahren zum Herstellen eines Tastenmoduls für eine Taste für eine Tastatur

Also Published As

Publication number Publication date
EP0100936A2 (fr) 1984-02-22
US4467160A (en) 1984-08-21
EP0100936A3 (en) 1987-01-07
KR890005313B1 (ko) 1989-12-20
ATE48494T1 (de) 1989-12-15
DE3229465C2 (fr) 1988-12-01
JPH0447932B2 (fr) 1992-08-05
KR840005906A (ko) 1984-11-19
DE3229465A1 (de) 1984-02-09
JPS59146113A (ja) 1984-08-21

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