EP0040324B1 - Drucktastenschalter - Google Patents

Drucktastenschalter Download PDF

Info

Publication number
EP0040324B1
EP0040324B1 EP81102803A EP81102803A EP0040324B1 EP 0040324 B1 EP0040324 B1 EP 0040324B1 EP 81102803 A EP81102803 A EP 81102803A EP 81102803 A EP81102803 A EP 81102803A EP 0040324 B1 EP0040324 B1 EP 0040324B1
Authority
EP
European Patent Office
Prior art keywords
push button
slide plate
housing
switch according
spring arm
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
EP81102803A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0040324A2 (de
EP0040324A3 (en
Inventor
Wolfgang Ing.-Grad. Labude
Karl-Heinz Bauer
Edgar Maisch
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.)
Preh GmbH
Original Assignee
Preh 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 Preh GmbH filed Critical Preh GmbH
Publication of EP0040324A2 publication Critical patent/EP0040324A2/de
Publication of EP0040324A3 publication Critical patent/EP0040324A3/de
Application granted granted Critical
Publication of EP0040324B1 publication Critical patent/EP0040324B1/de
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
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • 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
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard

Definitions

  • the invention is based on a push button switch according to the preamble of claim 1.
  • Pushbutton switches are used in particular in multiple versions, e.g. for pushbutton assemblies required for switching on the individual channels of HF receivers, e.g. Radio and television receivers.
  • the preset tuning voltage and thus the assigned station or channel can be switched on by pressing a single button.
  • the set tuning voltage is stored in the channel memory in the form of spindle resistors or rotary resistors connected as voltage dividers.
  • a pushbutton switch in connection with a pushbutton unit is already known, DE-A-28 33 184, which has a narrow, elongated switching rod which is guided in the front and rear wall of the housing.
  • contact rails Transverse to the shift rods, contact rails are held on the bottom of the housing, which among other things consists of a connecting part and a number of U-shaped spring parts corresponding to the number of shift rods.
  • One end of the spring part is connected to the connecting part, while the free end cooperates with the lugs of the shift rod.
  • the free ends of the spring parts are pressed against respectively assigned wire contacts via the lugs.
  • the spring parts thus serve at the same time as a return spring for the shift rods as well as an electrical connecting element. When switched on, the spring parts are subjected to both bending and torsion.
  • a push button switch is also already known, DE-A-2360168, in which a plunger can be displaced in a housing against the force of a return spring.
  • the snap spring and the contact arm are integrally and J-shaped. With the arcuate intermediate piece, the spring is pivotally mounted in a fixed contact piece. The free end of the long spring arm lies in a cutting edge bearing of the ram. The long spring arm is thus clamped arched on one side between two abutments.
  • the short spring arm serves as a contact arm and it carries a contact rivet.
  • the object of the present invention is to provide a pushbutton switch of the type mentioned at the outset which has the smallest possible overall width. According to the invention, this object is achieved by the features specified in the characterizing part of patent claim 1. Further advantageous embodiments of the invention can be found in the subclaims.
  • the pushbutton unit shown in FIG. 1 has, for example, eight pushbuttons for switching on the tuning voltages preset in the individual channel memories.
  • the channel accumulators consist of spindle resistors in which a spring carrier 49 with a sliding contact 50 is guided along a spindle 48 by turning a push-button 12.
  • the sliding contact establishes an electrical connection between a collector track or the spindle and a resistance element 9 (see FIG. 6) which is applied in a multiple arrangement in a known manner on an insulating plate made of hard paper or plastic.
  • This insulating material plate which is denoted by 2 in FIG. 1, forms the end of a housing 1 that is open on one side.
  • the housing itself is made of a glass fiber reinforced plastic for reasons of stability and thus also the return accuracy.
  • the soldering lugs 3 of the resistance elements protrude laterally out of the housing.
  • a push knob 12 which has a corrugated or otherwise non-slip edge. This allows the push button to be turned directly.
  • the push button can also be turned using a socket wrench, not shown in FIG. 1.
  • the push knob is provided with a cavity 13 which has a certain inner profile.
  • the socket wrench is inserted into this cavity, with the socket wrench outside has a profile that interacts with the inner profile in the sense of being carried along.
  • This coupling element 51 has a suspension ring 52 on the circumference, which interacts with an opposite slope on the outside of the push-button 12. Furthermore, the push-button at the end of the slope has an axially parallel toothing, the crosswise teeth 53 of which, when pressed, protrude into a corresponding inner profile of the coupling element 51 and act in the sense of a driver coupling. By pressing in the push button, the coupling element 51 is also pressed against the housing wall.
  • protruding warts 56 are formed, which then engage in incisions 57 in the coupling element 51 and cause a gradual detent according to the number of frequency ranges.
  • the push-button 12 is guided along a sleeve 58 molded onto the housing and immersed in the push-button 12.
  • the pushbutton has integrally formed snap tongues 59 which protrude through the coupling element into a longitudinal section 60 of the spindle and interact with the housing in a latching manner.
  • the coupling element also has an integrally formed pointer 14 which, depending on the latching position, is visible in one of the three display windows 15 of the locking rail 7 arranged in the form of a segment of a circle.
  • a swivel projection 65 which has a continuous cutout 66 in the middle, is integrally formed on the coupling element 51.
  • a resilient loop 69 of a wire-shaped contact spring 68 is inserted through this cutout. As will be explained, this contact spring serves for frequency range switching or band switching. If the coupling element is rotated into one of its locking positions, this contact spring 68 is also pivoted accordingly by a small angular range.
  • first busbar 61 made of metal is also arranged as a counterpart.
  • These busbars are common to all push buttons and their number corresponds to the number of preselectable frequency ranges or bands.
  • Each of these busbars has elongated recesses 67 corresponding to the number of pushbuttons, on the edge of which contact parts 70 are bent in pairs opposite one another on the longitudinal sides. These contact parts serve on the one hand as a holder on the housing and on the other hand as a counter contact to the resilient loop 69 of the contact spring.
  • these contact parts are located either at the right end of the recess 67, in the middle or at the left end, so that a total of three switching positions are possible.
  • the locking rail 7 is guided on the front outside of the housing in such a way that the locking rail has locking lugs 21 formed on its long side, which cooperate with locking receptacles 22 on the housing.
  • the locking rail is provided on the underside with an integrally formed web 23 which extends from the transverse side in the direction of displacement and is guided in a groove 24 in the housing.
  • the locking receptacles are designed as slots extending in the displacement direction, the length of which must correspond at least to the displacement stroke.
  • the openings 25 in the locking rail, through which the push buttons 12 and the push buttons 16 protrude, are likewise enlarged at least by the displacement stroke.
  • a mounting tab 26 is formed, with the help of which the push button assembly can be attached to the chassis of a television receiver.
  • each assembly has four snap hooks 27 on one side of the housing, which engage openings of the neighboring assembly, which are not shown in FIG.
  • locking lugs are provided for exact positioning of the structural units relative to one another, which are fitted into holes 28 of the neighboring structural unit.
  • the pushbuttons should also be mutually triggerable here.
  • each locking rail has a lateral driving arm 29 on one long side, which engages in a correspondingly profiled recess in the neighboring locking rail and ensures play-free driving.
  • the push button 16 consists of a flat key slide 4, one end of which is guided in a guide in a rear longitudinal wall 11 of the switch housing. The other end, which is guided in a front longitudinal wall, carries on its front end protruding from the housing a push button 19 which is press-fitted onto the key slide or which is integrally molded directly onto the key slide.
  • Each key slide is held in the housing and limited in its direction of displacement by a retaining lug 37 and by a stop which is not visible in FIG. 1.
  • the push button assembly shown in Figure 1 gat is to be used in particular in television receivers. To do this, it is necessary that in addition to switching on the channel, the frequency range is switched over. That is why two independent contact systems are operated with the key slide. For this reason, two leaf springs 8 are arranged in groove-shaped recesses B6 in the key slide. That leaf spring 8 is, as can be seen from FIGS. 4 and 5, J-shaped with a long spring arm 30 and a short spring arm 31, both of which are connected in one piece via an arcuate intermediate piece 32. This leaf spring is clamped between two abutments in such a way that it is slightly curved on one side. One way to achieve this is to arrange the two abutments in a non-aligned manner. The slight curvature of the leaf spring to one side is intended to ensure that when the two abutments move relative to one another, the leaf spring always bulges further towards this side.
  • the leaf spring itself can be made entirely of silver or of an inexpensive material to lower the contact resistance, which is provided at least on its contacting surface with a silver layer or another highly conductive contact layer.
  • the leaf spring also fulfills a double function, since on the one hand it is a contact spring and on the other hand it is also a return spring for the push button.
  • the long spring arm essentially takes over the function of the return spring, while the short spring arm serves as a contact arm. Due to this special J-shaped design of the leaf spring, the push button is very easy to operate.
  • the pressing force of the short spring arm also has to be added to the stationary contact piece, but this pressing force is reduced in relation to the distances between the action points.
  • the pressing force is supported by the angling of the short spring arm, which is approximately perpendicular to the push button's sliding direction.
  • the first abutment 33 is located in the key slide 4 at the end of the recess closer to the push button 19.
  • the second abutment is formed by a V-shaped cutting edge bearing 35 in a first fixed contact piece 34.
  • This contact piece is also a spring element, which is made of metal.
  • a plurality of spring elements are connected to one another by a connecting part 41 and constitute a first contact rail 40, the soldered connection part 42 of which is led laterally out of the housing.
  • this first contact rail 40 is attached to the rear longitudinal wall 11 of the housing. Also on this rear longitudinal wall, a second contact rail 43 is held with the solder connection part 53, the first contact rail being used for switching through the frequency range selection.
  • Both contact rails are fastened to the longitudinal wall by means of screws 55 in such a way that they are electrically insulated from one another by an insulating plate 54. In addition, they are laterally offset from one another.
  • One spring element each of the first and second contact rails form a pair and they are arranged such that they are aligned with the two cutouts in the key switch. Since on the one hand the spring elements belonging in pairs lie one behind the other and on the other hand the leaf springs are of the same size, the recesses in the key slide are of different lengths.
  • the long spring arm lies in the first abutment in the key slide. With the arc-shaped intermediate piece 32, the leaf spring 8 lies in the V-shaped cutting edge bearing 35 of the spring element 34 of the contact rail 40.
  • the short spring arm 31 has an angled portion directed against the long spring arm 30 at its free end. As can be seen from FIG. 5, the long spring arm presses the short spring arm against the second stationary contact piece 38 by means of the bend. This significantly increases the contact pressure.
  • the first spring arm thus serves both as a return spring for the key slide and as a support for the short spring arm, which in the switched-on position establishes an electrical connection between the contact rail and the second stationary contact piece.
  • two types of second fixed contact pieces are available.
  • this consists in one piece of a metal part with an upper part which interacts with the short spring arm 31 of the leaf spring, as can be seen in FIGS. 4 and 5, and with a lower part which acts as contact pieces 72 and serves to contact the spindle 48.
  • an opening 73 which is to receive the spindle, runs in the middle from bottom to top in the middle.
  • Two fork arms protrude into this opening from both sides, the lower ends 74 of which are provided with latching lugs which snap into corresponding latching recesses in the housing, and the upper, inwardly pointing spring tongues 75 of which are pretensioned in a groove 76 of the spindle.
  • the second stationary contact piece for the frequency range switchover consists of an angled loop 71 of the contact spring.

Landscapes

  • Push-Button Switches (AREA)
  • Slide Switches (AREA)
EP81102803A 1980-05-16 1981-04-11 Drucktastenschalter Expired EP0040324B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3018810 1980-05-16
DE19803018810 DE3018810A1 (de) 1980-05-16 1980-05-16 Drucktastenschalter

Publications (3)

Publication Number Publication Date
EP0040324A2 EP0040324A2 (de) 1981-11-25
EP0040324A3 EP0040324A3 (en) 1982-05-12
EP0040324B1 true EP0040324B1 (de) 1984-09-12

Family

ID=6102636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102803A Expired EP0040324B1 (de) 1980-05-16 1981-04-11 Drucktastenschalter

Country Status (5)

Country Link
US (1) US4431876A (enrdf_load_stackoverflow)
EP (1) EP0040324B1 (enrdf_load_stackoverflow)
JP (1) JPS577032A (enrdf_load_stackoverflow)
DE (1) DE3018810A1 (enrdf_load_stackoverflow)
ES (1) ES502244A0 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209913C2 (de) * 1982-03-18 1986-02-06 Preh, Elektrofeinmechanische Werke Jakob Preh Nachf. Gmbh & Co, 8740 Bad Neustadt Drucktastenaggregat
FR2597620B1 (fr) * 1986-04-21 1989-12-29 Spectec Disposition de vision optique bidimensionnel obtenu au moyen d'un controle de la deflexion du faisceau lumineux au moyen d'au moins un moyen faisant office de detecteur lateral
US5106586A (en) * 1990-05-23 1992-04-21 Eastman Kodak Company J-shaped spring used in incubator
DE4037454A1 (de) * 1990-11-24 1992-05-27 Marquardt Gmbh Schaltermodul
CN109841444B (zh) * 2019-03-28 2024-01-09 东莞市凝锐开关有限公司 组合开关

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2360168A1 (de) * 1973-12-03 1975-06-05 Marquardt J & J Schalter, insbesondere taster
DE2833184A1 (de) * 1978-07-28 1980-02-07 Preh Elektro Feinmechanik Drucktastenaggregat

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268701A (en) * 1964-04-22 1966-08-23 Alloys Unltd Inc Clad electrical contacts
DE1791232B1 (de) * 1964-12-24 1971-12-30 Hopt Electronic Gmbh Abstimmvorrichtung fuer hochfrequenz nachrichten uebertra gungsgeraete
DE1590817A1 (de) * 1965-03-20 1970-07-09 Vdo Schindling Elektrischer Schnappschalter
DE1919036B2 (de) * 1969-04-15 1971-11-04 Drucktastenaggregat
GB1313125A (en) * 1970-04-29 1973-04-11 Kienzle Apparate Gmbh Taximeter keyboard unit
GB1372927A (en) * 1972-01-19 1974-11-06 Plessey Co Ltd Electric switches
DE2264953C3 (de) * 1972-06-20 1978-03-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Photoelektrischer Schalter
US3792387A (en) * 1973-01-26 1974-02-12 Gte Sylvania Inc Pushbutton tuning system
DE2423075C2 (de) * 1974-05-13 1983-10-20 J.& J. Marquardt, 7201 Rietheim-Weilheim Elektrischer Schalter
DE2510902C3 (de) * 1975-03-13 1979-10-04 J. & J. Marquardt, 7201 Rietheim Elektrischer Schalter
US4177367A (en) * 1978-07-18 1979-12-04 Amf Incorporated Push button switch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2360168A1 (de) * 1973-12-03 1975-06-05 Marquardt J & J Schalter, insbesondere taster
DE2833184A1 (de) * 1978-07-28 1980-02-07 Preh Elektro Feinmechanik Drucktastenaggregat

Also Published As

Publication number Publication date
ES8203527A1 (es) 1982-04-01
EP0040324A2 (de) 1981-11-25
EP0040324A3 (en) 1982-05-12
DE3018810C2 (enrdf_load_stackoverflow) 1988-03-17
DE3018810A1 (de) 1981-11-26
ES502244A0 (es) 1982-04-01
JPS577032A (en) 1982-01-14
JPH0159687B2 (enrdf_load_stackoverflow) 1989-12-19
US4431876A (en) 1984-02-14

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