EP0643408A1 - Interrupteur à bouton-poussoir - Google Patents

Interrupteur à bouton-poussoir Download PDF

Info

Publication number
EP0643408A1
EP0643408A1 EP94107338A EP94107338A EP0643408A1 EP 0643408 A1 EP0643408 A1 EP 0643408A1 EP 94107338 A EP94107338 A EP 94107338A EP 94107338 A EP94107338 A EP 94107338A EP 0643408 A1 EP0643408 A1 EP 0643408A1
Authority
EP
European Patent Office
Prior art keywords
switching plunger
key switch
guide
switch according
leg
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.)
Granted
Application number
EP94107338A
Other languages
German (de)
English (en)
Other versions
EP0643408B1 (fr
Inventor
Karl-Heinz Bauer
Anton Rüttiger
Gerold Eckert
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 EP0643408A1 publication Critical patent/EP0643408A1/fr
Application granted granted Critical
Publication of EP0643408B1 publication Critical patent/EP0643408B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H13/20—Driving mechanisms
    • 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
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • 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
    • H01H13/023—Light-emitting indicators

Definitions

  • the invention relates to a push button switch with a switching plunger, the stroke of which generates a pressure point, a contact and a restoring voltage under spring action.
  • Such pushbutton switches are described in DE-GM 81 14 214, DE 35 20 848 A1, EP 0 074 004 A2, EP 0 123 818 A1 and EP 0 515 943 A2. These have their own spring elements for the functions: pressure point generation, contacting and resetting. The construction and assembly work is accordingly large. In addition, difficulties arise when the switching stroke of the switching plunger is only small and it should be ensured that the pressure point is before the switching point during the stroke.
  • DE 36 22 962 A1 also describes a key switch of the type mentioned at the beginning.
  • the actuation should be clearly felt with a small stroke, for example 1 mm to 3 mm, and the pressure point should be in front of the switching point.
  • Such switches are required, for example, in automotive electronics.
  • an end turn of a helical return spring is provided with inwardly deformed sections which cooperate with an oblique locking edge of the switching plunger in order to generate the pressure point.
  • the contact is made by an independent contact spring set.
  • the structural assignment of the contact spring set and the switching plunger is sensitive to tolerances with regard to the short stroke and the required switching sequence.
  • the helical return spring with the inwardly deformed sections that are supposed to spring radially is difficult to dimension. In addition, friction occurs between the mentioned sections and the switching plunger after the pressure point has been overcome.
  • the object of the invention is to propose a pushbutton switch of the type mentioned, in which, with a simple structure and with a short stroke, reliable contact actuation is achieved after a pressure point has been overcome.
  • a one-piece spring element which, on the one hand, forms a resiliently movable contact arm and, on the other hand, a resilient return arm which rests on the switching plunger, on the spring element between the contact arm and the return arm, resiliently curved in a hairpin-shaped manner
  • Guide legs are formed on which the switching plunger is displaceable, and that at least on the guide arm adjoining the contact arm, an oblique step is formed on which the switching plunger acts during the stroke while pivoting the guide leg and thus the contact arm.
  • the one-piece spring element takes over the functions of generating the pressure point, making contact or opening the contact and resetting the switching plunger.
  • the construction and assembly costs are low.
  • the spring element is also easy to manufacture as a stamped and bent part.
  • a very small construction of the pushbutton switch is possible due to the spring element.
  • the switching plunger When the switching plunger is actuated, it first acts on the inclined step, which creates a clearly perceptible resistance. The guide leg tightens. When the step then leaves the switching plunger, the pressure point is exceeded and contact is made by means of the contact arm. During the stroke, the plunger tensions the return arm, which then brings the plunger into its initial position.
  • a housing (1) is arranged above a circuit board (2) on which, among other things, two guide surfaces (4, 5) to be connected by means of a push button switch (3).
  • the push button switch (3) has a switching plunger (6).
  • a finger (7) of the switching plunger (6) protrudes through the housing (1) and can be acted upon by an actuating element (8).
  • a rib (9) is formed on the switching plunger (6) and lies in a recess (10) in the housing (1).
  • the switching plunger (6) can also be guided laterally at the points (11, 12) of the housing (1) (cf. FIG. 3). In any case, the switching plunger (6) is guided with low friction in the longitudinal direction.
  • a boom (13) is provided on the switching plunger (6) and is provided with an opening (14).
  • a slope (15) is formed on the housing (1), on which the boom (13) slides in the manner described in more detail below.
  • the pushbutton switch (3) has a one-piece spring element (16) which is made from a stamped and bent part, for example from partially gold-plated V2A steel.
  • the spring element forms two hairpin-shaped curved guide legs (17, 18) which extend through the opening (14) of the switching plunger (6) and are inserted into a receptacle (19) of the housing (1).
  • the guide leg (17) merges into a connecting leg (20) which makes electrical contact sits on the guide surface (4).
  • beads can be formed on the connecting leg (20).
  • a spring return arm (21) adjoins the connecting leg (20) in the shape of a hairpin, the free end (22) of which rests on a knob (23) of the arm (13) of the switching plunger (6).
  • an oblique step (24) is formed on the guide leg (18) below the arm (13).
  • a springy contact arm (26) of the spring element (16) adjoins the lower end (25) of the guide leg (18), the contact knob (27) of which lies above the guide surface (5) in the starting position.
  • the contact arm (26) can also end in two or more contact fingers.
  • the function of the described push button switch is approximately as follows: In the initial position (Fig. 1), the switching plunger (6) is held upwards by means of the prestressed reset arm (21). The switching plunger (6) thus finds a stop on the housing (1). If the actuating member (8) is then pressed in the direction of arrow (A), the edge (28) of the opening (14) presses on the inclined step (24) so that the guide leg (18) faces the guide leg (17). pivoted towards it, resulting in a pretension between the guide legs (17, 18). A tactile force is to be applied. The pressure increase is shown in the diagram of FIG. 10 in area a.
  • step (24) When the edge (28) has reached the end of step (24) (cf. FIG. 2), then the pressure point (D) (cf. FIG. 10) has been reached. Until then, the plunger has moved in the direction of arrow (B).
  • a nose (30) of the switching plunger (6) hits the contact arm (26), so that it deforms, as a result of which the contact pressure is increased (cf. FIG. 4).
  • This pressure range is designated d in the diagram according to FIG. 10.
  • the contact pressure (P) of the contact arm (26) on the guide surface (5) is greater than the pressure at the pressure point (D).
  • the stroke of the switching plunger (6) is between 1 mm and 2 mm, in the diagram according to FIG. 10 approximately 1.2 mm.
  • the pressure point (D) is reached at 0.25 mm.
  • the actuator (8) is tiltably mounted on the housing (1) in the exemplary embodiment (cf. FIGS. 3, 5). It can be tilted around a projection (31) which faces an actuating surface (32) for the finger (7) of the switching plunger (6).
  • a light guide (33) is attached to the actuator (8) and faces an LED light source (34) on the circuit board (2).
  • the switching plunger (6) can, however, also be switched with other actuators (8).
  • the tilting movement of the switching plunger (6) in the direction of arrow (C) after reaching the pressure point (D) is not achieved by the bevel (15) and a corresponding shaping of the arm (13).
  • the tilting movement is advantageous because, when the opening (14) is removed from the force applied to the finger (7), it leads to reduced friction and enables a high contact pressure (P).
  • a formation (35) is formed at the lower end of the guide leg (17) to produce this tilting movement, onto which an edge (36) of the opening (14) opposite the edge (28) after reaching the pressure point (D) ) meets.
  • the one-piece spring element (16) also takes over the function of tilting the switching plunger (6).
  • inclined steps (24, 24 ') are formed on both guide legs (17, 18).
  • the guide legs (17, 18) are guided in a shaft (37) of the switching plunger (6), the shaft (37) extending in the direction of movement (B) of the switching plunger (6). So it is not like the opening (14) next to the direction of the pressurization, but concentric to this. The tilting movement described does not take place here.
  • both inclined steps (24, 24 ') generate the pressure point.
  • the switching plunger (6) moves over the steps (24, 24 ') (cf. Fig. 8).
  • the connecting leg (20) moves on the guide surface (4).
  • the contact arm (26) is also biased by the nose (30) so that it rests on the guide surface (5) with high contact pressure.
  • the return arm (21) is biased via the knob (23).
  • the embodiment according to FIG. 9 is a combination of the embodiments according to FIGS. 1 and 7.
  • the guide legs (17, 18) sit in a shaft (37) central to the direction of movement (B). Only the guide leg (18) has an inclined step (24).
  • the switching plunger (6) is actuated, the connecting leg (20) does not move on the guide surface (4).
  • the described tilting movement of the switching plunger (6) does not take place here.
  • the contact arm (26) is also pretensioned by means of the Nose (30) pressed onto the contact surface.
  • higher friction between the guide legs (17, 18) of the one-piece spring element (16) is to be expected than in the exemplary embodiments according to FIGS. 1 to 6, since the guide legs (17, 18) in the Insert the switch plunger (6).

Landscapes

  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
EP94107338A 1993-09-09 1994-05-11 Interrupteur à bouton-poussoir Expired - Lifetime EP0643408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4330576A DE4330576C1 (de) 1993-09-09 1993-09-09 Tastschalter
DE4330576 1993-09-09

Publications (2)

Publication Number Publication Date
EP0643408A1 true EP0643408A1 (fr) 1995-03-15
EP0643408B1 EP0643408B1 (fr) 1997-07-30

Family

ID=6497283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94107338A Expired - Lifetime EP0643408B1 (fr) 1993-09-09 1994-05-11 Interrupteur à bouton-poussoir

Country Status (5)

Country Link
US (1) US5545864A (fr)
EP (1) EP0643408B1 (fr)
JP (1) JPH07169364A (fr)
DE (1) DE4330576C1 (fr)
ES (1) ES2106405T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015200177A1 (de) 2015-01-09 2016-07-14 Volkswagen Aktiengesellschaft Bedienelement zur Auswahl eines Betriebsmodus eines Fahrzeugs

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742575B1 (fr) * 1995-12-19 1998-01-09 Europ Equip Menager Dispositif a touche sensitive
US5821490A (en) * 1996-07-26 1998-10-13 Yazaki Corporation Push button switch module
FR2753832B1 (fr) * 1996-09-26 1998-10-23 Interrupteur electrique pour la detection de l'introduction d'une cle dans un antivol de vehicule automobile
US5983026A (en) * 1998-06-11 1999-11-09 Eastman Kodak Company One-time-use camera with variable format film encoder
DE19834375C1 (de) * 1998-07-30 1999-12-09 Preh Elektro Feinmechanik Leiterplatte
DE10250262A1 (de) 2001-11-02 2003-05-15 Marquardt Gmbh Elektrischer Schalter
DE10237207B3 (de) * 2002-08-14 2004-02-05 Braun Gmbh Tastschalter
DE102010026516B4 (de) 2010-07-08 2013-04-11 Austriamicrosystems Ag Feder für einen Drucktaster, Federanordnung und Tasteranordnung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2450742A1 (de) * 1974-10-25 1976-04-29 Marquardt J & J Elektrischer schalter
DE2556461A1 (de) * 1975-12-15 1977-06-16 Baer Elektrowerke Kg Elektrischer schalter
DE2729216B1 (de) * 1977-06-29 1978-12-07 Opel Adam Ag Schalter fuer die Betaetigung einer elektrischen Leuchte in Fahrzeugen,insbesondere Kraftfahrzeugen
CH671648A5 (en) * 1987-02-13 1989-09-15 Contraves Ag Electric contact device for keyboard switch - uses double armed contact element between pushbutton operating element and fixed counter contact pin
DE9314076U1 (de) * 1993-09-17 1993-11-25 Wang, Kun Chu, Tu Cherng, Taipeh Taste für eine Computertastatur

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2510902C3 (de) * 1975-03-13 1979-10-04 J. & J. Marquardt, 7201 Rietheim Elektrischer Schalter
AU531859B2 (en) * 1979-03-10 1983-09-08 Amp Incorporated Electrical switch
DE8114214U1 (de) * 1981-05-14 1981-11-05 Fa. Leopold Kostal, 5880 Lüdenscheid Drucktastenschalter
DE3135655A1 (de) * 1981-09-09 1983-03-24 Rafi Gmbh & Co Elektrotechnische Spezialfabrik, 7981 Berg "drucktaster fuer elektrische geraete"
DE8309913U1 (de) * 1983-04-05 1985-03-28 Dr. Eugen Sasse GmbH Bauelemente für die Elektronik, 8540 Schwabach Tastaturtaste, insbesondere für Fernsprechtastenapparate
KR900002525Y1 (ko) * 1984-07-11 1990-03-30 알프스덴기 가부시기 가이샤 푸시 버튼 스위치
DE3622962A1 (de) * 1986-07-09 1988-01-21 Schadow Rudolf Gmbh Drucktastenschalter, insbesondere tastschalter
US4789764A (en) * 1987-12-21 1988-12-06 Illinois Tool Works Inc. Pushbutton switch with resilient extensible pivotable contact element
ES2077913T3 (es) * 1991-05-27 1995-12-01 Marquardt Gmbh Pulsador.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2450742A1 (de) * 1974-10-25 1976-04-29 Marquardt J & J Elektrischer schalter
DE2556461A1 (de) * 1975-12-15 1977-06-16 Baer Elektrowerke Kg Elektrischer schalter
DE2729216B1 (de) * 1977-06-29 1978-12-07 Opel Adam Ag Schalter fuer die Betaetigung einer elektrischen Leuchte in Fahrzeugen,insbesondere Kraftfahrzeugen
CH671648A5 (en) * 1987-02-13 1989-09-15 Contraves Ag Electric contact device for keyboard switch - uses double armed contact element between pushbutton operating element and fixed counter contact pin
DE9314076U1 (de) * 1993-09-17 1993-11-25 Wang, Kun Chu, Tu Cherng, Taipeh Taste für eine Computertastatur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015200177A1 (de) 2015-01-09 2016-07-14 Volkswagen Aktiengesellschaft Bedienelement zur Auswahl eines Betriebsmodus eines Fahrzeugs
DE102015200177B4 (de) 2015-01-09 2022-12-08 Volkswagen Aktiengesellschaft Bedienelement zur Auswahl eines Betriebsmodus eines Fahrzeugs

Also Published As

Publication number Publication date
ES2106405T3 (es) 1997-11-01
DE4330576C1 (de) 1994-11-10
EP0643408B1 (fr) 1997-07-30
JPH07169364A (ja) 1995-07-04
US5545864A (en) 1996-08-13

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