EP1151451B1 - Push button - Google Patents

Push button Download PDF

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Publication number
EP1151451B1
EP1151451B1 EP99973660A EP99973660A EP1151451B1 EP 1151451 B1 EP1151451 B1 EP 1151451B1 EP 99973660 A EP99973660 A EP 99973660A EP 99973660 A EP99973660 A EP 99973660A EP 1151451 B1 EP1151451 B1 EP 1151451B1
Authority
EP
European Patent Office
Prior art keywords
plunger
bellows
rolling bellows
push button
moulding compound
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.)
Revoked
Application number
EP99973660A
Other languages
German (de)
French (fr)
Other versions
EP1151451A1 (en
Inventor
Alfred Bonn
Peter Pfaff
Artur Wiese
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.)
Eaton Industries GmbH
Original Assignee
Moeller 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7895977&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1151451(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Moeller GmbH filed Critical Moeller GmbH
Publication of EP1151451A1 publication Critical patent/EP1151451A1/en
Application granted granted Critical
Publication of EP1151451B1 publication Critical patent/EP1151451B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • H01H13/063—Casings hermetically closed by a diaphragm through which passes an actuating member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H2011/0081—Apparatus or processes specially adapted for the manufacture of electric switches using double shot moulding, e.g. for forming elastomeric sealing elements on form stable casing

Definitions

  • the invention relates to a method according to the preamble of the independent claim.
  • the pushbuttons thus manufactured are made essentially of a two-part housing, one in the housing linearly movable, spring-loaded push button plunger and one on the Tappet attachable roller bellows.
  • the object of the invention is to provide a push button that with respect Manufacturing and function (sealing) is further optimized.
  • the bellows designed so that it is a thermoplastic molding compound in a common tool almost simultaneously - with only a short time Delay - injected into the mold with the molding compound of the ram and thus sprayed around the plunger.
  • the materials selected by plunger and roll bellows so that the two materials do not bond interact with each other.
  • the invention is used as a material for the plunger and polycarbonate Styrene-ethylene-butylene-styrene (SEBS block) is used as the material for the rolling bellows.
  • SEBS block Styrene-ethylene-butylene-styrene
  • An optimized friction or shrink connection is achieved by forming the plunger with a circumferential groove, which is dimensioned such that the lower edge of the bellows trumpet-shaped trained bellows an optimized material shrinkage through the defined Mass accumulation of the bellows material in the area of the tappet groove is experienced.
  • the mass accumulation achieved in this way of the lower edge of the roller bellows is included Advantage greater by at least a factor of 2 than in the rest of the bellows area.
  • the Push button according to the invention can be much easier and more efficient are manufactured and guaranteed on the other hand compared to conventional Push buttons an increased tightness with regard to dirt and Humidity.
  • a push button according to the invention consists of a two-part Housing with an upper part 2 and a lower part 4 by means of a Screw or a snap connection can be connected to each other, one within of the housing linearly arranged plunger 6, the between a rest position and an operating position is movable and by a Spring element 8 is subjected to a spring force counter to its direction of actuation and a bellows arranged circumferentially on the tappet 6 10 for sealing the interior of the housing.
  • the plunger 6 is essentially hollow cylindrical. One end is designed as a circular cover surface 6a for manual actuation of the push button, while the other end of actuating a contact assembly (not shown) serves and with collar-like extensions facing outwards 6b is designed for engagement and support on the housing.
  • the spring element 8 is designed as a spiral spring and around the tappet body arranged around. The spring 8 is supported on the tappet body between the collar-like lower extensions 6b and an annular counter bearing 6c of the plunger body.
  • the counter bearing 6c is advantageously an annular one Extension of the plunger body is formed and points to it outer, the facing housing wall facing an annular groove to accommodate another sealing element.
  • the bellows 10 is preferably trumpet-shaped.
  • the plunger 6 and the bellows 10 are produced in two-component injection molding technology, the plastics for the plunger 6 and the bellows 10 being selected such that the plunger 6 and the bellows 10 do not form an adhesive bond with one another. This ensures an optimized rolling behavior of the rolling bellows 10.
  • the plunger 6 has an annular groove 12 on the circumference for the fixation of the bellows 6. This groove 12 is dimensioned in coordination with the production tool (injection mold) such that the material accumulation of the rolling bellows 10 in the area of the groove 12 is at least a factor of 2 greater than in the rest of the area.
  • Fig. 2 shows the tappet 6 with the bellows 10 in a perspective view.

Landscapes

  • Push-Button Switches (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Massaging Devices (AREA)
  • Eye Examination Apparatus (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

The invention relates to a push button, especially for electric control devices. According to the invention, a plunger is used which comprises rolled bellows that are injection molded thereon in a two component method. As a result, a push button is produced which exhibits significantly improved features with regard to sealing against dirt and moisture.

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des unabhängigen Anspruchs.The invention relates to a method according to the preamble of the independent claim.

Es sind bereits derartige Verfahren bekannt (EP-A-0 404 718). Die hiemit hergestellten Drucktaster bestehen im wesentlichen aus einem zweiteiligen Gehäuse, einem in dem Gehäuse linearbeweglich, federnd gelagerten Drucktastenstößel und einem an dem Stößel befestigbaren Rollbalg.Such methods are already known (EP-A-0 404 718). The pushbuttons thus manufactured are made essentially of a two-part housing, one in the housing linearly movable, spring-loaded push button plunger and one on the Tappet attachable roller bellows.

Derartige Konstruktionen haben sich in der Vergangenheit bereits bewährt.Such constructions have already proven themselves in the past.

Aufgabe der Erfindung ist es, eine Drucktaste zu schaffen, die hinsichtlich Fertigung und Funktion (Abdichtung) weiter optimiert ist.The object of the invention is to provide a push button that with respect Manufacturing and function (sealing) is further optimized.

Ausgehend von einer Drucktaste der eingangs genannten Art wird die Aufgabe erfindungsgemäß durch die kennzeichnenden Merkmale des unabhängigen Anspruches gelöst, während den abhängigen Ansprüchen vorteilhafte Weiterbildungen der Erfindung zu entnehmen sind. Gemäß der Erfindung ist der Rollbalg konstruktiv so gestaltet, daß er als thermoplastische Formmasse in einem gemeinsamen Werkzeug nahezu zeitgleich - mit nur kurzer zeitlicher Verzögerung - mit der Formmasse des Stößels in das Werkzeug eingespritzt und somit um den Stößel herumgespritzt wird. Hierbei werden die Werkstoffe von Stößel und Rollbalg so gewählt, daß die beiden Werkstoffe keinen Haftverbund miteinander eingehen. In einer besonders bevorzugten Ausführungsform der Erfindung wird als Werkstoff für den Stößel Polycarbonat und als Werkstoff für den Rollbalg Styrol-Etylen-Butylen-Styrol (SEBS-Block) verwendet. Eine optimierte Kraftschluß- beziehungsweise Schrumpfverbindung wird erreicht, indem der Stößel mit einer umfänglichen Nut ausgebildet wird, die derart dimensioniert ist, daß der untere Rollbalgrand des trompetenförmig ausgebildeten Rollbalgs eine optimierte Materialschwindung durch die definierte Massenanhäufung des Rollbalgwerkstoffs im Bereich der Stößelnut erfährt. Die so erzielte Massenanhäufung des unteren Rollbalgrandes ist mit Vorteil um mindestens den Faktor 2 größer als im übrigen Rollbalgbereich. Die erfindungsgemäße Drucktaste kann zum einen deutlich einfacher und effizienter hergestellt werden und gewährleistet zum anderen gegenüber herkömmlichen Drucktasten eine erhöhte Dichtigkeit hinsichtlich Schmutz und Feuchtigkeit.Starting from a push button of the type mentioned in the beginning, the task according to the invention by the characteristic features of the independent Claim solved, while the dependent claims advantageous Further developments of the invention can be found. According to the invention the bellows designed so that it is a thermoplastic molding compound in a common tool almost simultaneously - with only a short time Delay - injected into the mold with the molding compound of the ram and thus sprayed around the plunger. Here, the materials selected by plunger and roll bellows so that the two materials do not bond interact with each other. In a particularly preferred embodiment The invention is used as a material for the plunger and polycarbonate Styrene-ethylene-butylene-styrene (SEBS block) is used as the material for the rolling bellows. An optimized friction or shrink connection is achieved by forming the plunger with a circumferential groove, which is dimensioned such that the lower edge of the bellows trumpet-shaped trained bellows an optimized material shrinkage through the defined Mass accumulation of the bellows material in the area of the tappet groove is experienced. The mass accumulation achieved in this way of the lower edge of the roller bellows is included Advantage greater by at least a factor of 2 than in the rest of the bellows area. The Push button according to the invention can be much easier and more efficient are manufactured and guaranteed on the other hand compared to conventional Push buttons an increased tightness with regard to dirt and Humidity.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus dem folgenden, anhand von Figuren erläuterten Ausführungsbeispiel. Es zeigen

Figur 1:
die erfindungsgemäße Drucktaste in einer möglichen Ausführungsform in einer Längsschnittdarstellung;
Figur 2:
den Stößel mit Rollbalg gemäß Fig. 1 in einer Perspektivdarstellung; und
Figur 3:
den Stößel gemäß Fig. 2 im Längsschnitt entlang der Schnittlinie A-A.
Further details and advantages of the invention result from the following exemplary embodiment explained with reference to figures. Show it
Figure 1:
the push button according to the invention in a possible embodiment in a longitudinal sectional view;
Figure 2:
the tappet with roller bellows according to Figure 1 in a perspective view. and
Figure 3:
2 in longitudinal section along the section line AA.

Nach Fig. 1 besteht eine erfindungsgemäße Drucktaste aus einem zweiteiligen Gehäuse mit einem Oberteil 2 und einem Unterteil 4 die mittels einer Schraub- oder einer Rastverbindung miteinander verbindbar sind, einem innerhalb des Gehäuses linearbeweglich angeordneten Stößel 6, der zwischen einer Ruhestellung und einer Betriebsstellung bewegbar ist und der durch ein Federelement 8 entgegen seiner Betätigungsrichtung mit einer Federkraft beaufschlagt ist, und einem umfänglich an dem Stößel 6 angeordneten Rollbalg 10 zur Abdichtung des Gehäuseinneren.1, a push button according to the invention consists of a two-part Housing with an upper part 2 and a lower part 4 by means of a Screw or a snap connection can be connected to each other, one within of the housing linearly arranged plunger 6, the between a rest position and an operating position is movable and by a Spring element 8 is subjected to a spring force counter to its direction of actuation and a bellows arranged circumferentially on the tappet 6 10 for sealing the interior of the housing.

Der Stößel 6 ist im wesentlichen hohlzylinderförmig ausgebildet. Das eine Ende ist als kreisrunde Deckelfläche 6a zur Handbetätigung der Drucktaste ausgebildet, während das andere Ende der Betätigung einer Kontaktanordnung (nicht dargestellt) dient und mit nach außen weisenden kragenartigen Fortsätzen 6b zur Hintergreifung und Abstützung am Gehäuse ausgebildet ist. Das Federelement 8 ist als Spiralfeder ausgebildet und um den Stößelkörper herum angeordnet. Dabei stützt die Feder 8 sich am Stößelkörper zwischen den kragenartigen unteren Fortsätzen 6b und einem kreisringförmigen Gegenlager 6c des Stößelkörpers ab. Das Gegenlager 6c ist mit Vorteil als kreisringförmige Erweiterung des Stößelkörpers ausgebildet und weist auf seiner äußeren, der umliegenden Gehäusewand zugekehrten Stirnfläche eine Ringnut zur Aufnahme eines weiteren Dichtungselementes auf.The plunger 6 is essentially hollow cylindrical. One end is designed as a circular cover surface 6a for manual actuation of the push button, while the other end of actuating a contact assembly (not shown) serves and with collar-like extensions facing outwards 6b is designed for engagement and support on the housing. The spring element 8 is designed as a spiral spring and around the tappet body arranged around. The spring 8 is supported on the tappet body between the collar-like lower extensions 6b and an annular counter bearing 6c of the plunger body. The counter bearing 6c is advantageously an annular one Extension of the plunger body is formed and points to it outer, the facing housing wall facing an annular groove to accommodate another sealing element.

Der Rollbalg 10 ist vorzugsweise trompetenförmig. Gemäß der Erfindung sind der Stößel 6 und der Rollbalg 10 in 2-Komponenten Spritztechnik hergestellt, wobei die Kunststoffe für Stößel 6 und Rollbalg 10 derart gewählt sind, daß Stößel 6 und Rollbalg 10 keinen Haftverbund miteinander eingehen. Hierdurch wird ein optimiertes Abrollverhalten des Rollbalgs 10 gewährleistet. Mit Vorteil weist der Stößel 6 umfänglich eine kreisringförmige Nut 12 zur fixierenden Aufnahme des Rollbalgs 6 auf. Diese Nut 12 ist in Abstimmung mit dem Herstellungswerkzeug (Spritzform) derart dimensioniert, daß die Materialanhäufung des Rollbalgs 10 im Bereich der Nut 12 mindestens um den Faktor 2 größer ist als im übrigen Bereich. Hierdurch wird eine deutlich verbesserte "Verbindung" beziehungsweise ein verbesserter Schluß zwischen Stößel 6 und Rollbalg 10 und somit auch eine erhöhte Dichtigkeit zwischen den beiden Teilen erreicht. Mit Vorteil werden die beiden Teile in einem gemeinsamen Spritzvorgang gefertigt und dadurch zugleich schon montiert. Der separate Montageschritt, den Rollbalg 10 an dem Stößel 10 genaustens zu positionieren entfällt somit.
Als besonders vorteilhaft erwiesen sich bei der Konstruktion der Stößel-Rollbalg-Kombination die Verwendung von Polycarbonat als Stößelwerkstoff und SEBS als Rollbalgwerkstoff.The bellows 10 is preferably trumpet-shaped. According to the invention, the plunger 6 and the bellows 10 are produced in two-component injection molding technology, the plastics for the plunger 6 and the bellows 10 being selected such that the plunger 6 and the bellows 10 do not form an adhesive bond with one another. This ensures an optimized rolling behavior of the rolling bellows 10. Advantageously, the plunger 6 has an annular groove 12 on the circumference for the fixation of the bellows 6. This groove 12 is dimensioned in coordination with the production tool (injection mold) such that the material accumulation of the rolling bellows 10 in the area of the groove 12 is at least a factor of 2 greater than in the rest of the area. This results in a significantly improved "connection" or an improved closure between the tappet 6 and the bellows 10 and thus also an increased tightness between the two parts. The two parts are advantageously produced in a joint injection molding process and are thus already assembled at the same time. The separate assembly step of precisely positioning the bellows 10 on the tappet 10 is therefore eliminated.
The use of polycarbonate as the tappet material and SEBS as the roll bellows material proved to be particularly advantageous in the construction of the tappet-bellows combination.

Fig. 2 zeigt den Stößel 6 mit Rollbalg 10 in einer Perspektivdarstellung. Fig. 2 shows the tappet 6 with the bellows 10 in a perspective view.

In Fig. 3 ist deutlich die unterschiedliche Massenverteilung in unterschiedlichen Bereichen des Rollbalgs 10 erkennbar. Durch die definierte Materialverteilung des Rollbalgwerkstoffs wird mit Vorteil eine gezielte Materialschwindung in bestimmten Bereichen (I, II) des Rollbalgs 10 erreicht. Hierdurch wird zum einen im Bereich I die Dichtigkeit zwischen Stößel 6 und Rollbalg 10 erhöht und zum anderen die Abrolleigenschaften im Bereich II des Rollbalgs 10 weiter verbessert. Insbesondere für die Abrolleigenschaften des Rollbalgs ist es unabdingbar, daß die unterschiedlichen Werkstoffe von Stößel 6 und Rollbalg 10 keinen Haftverbund miteinander eingehen.3 clearly shows the different mass distribution in different Areas of the rolling bellows 10 can be seen. Through the defined material distribution of the bellows material is advantageously a targeted material shrinkage reached in certain areas (I, II) of the bellows 10. This will on the one hand, in area I, the tightness between tappet 6 and rolling bellows 10 increases and on the other hand the rolling properties in area II of the bellows 10 further improved. In particular for the rolling properties of the bellows it is essential that the different materials of the plunger 6 and the bellows 10 do not form a bond.

Die vorliegende Erfindung ist nicht auf die vorstehend beschriebenen Ausführungsformen beschränkt, sondern umfaßt auch alle im Sinne der Erfindung gleichwirkenden Ausführungsformen. So ist natürlich auch die Verwendung anderer Werkstoffkombinationen, die die beschriebenen Eigenschaften aufweisen, oder die Ausbildung von Stößel 6 und Rollbalg 10 in anderen geometrischen Formen vorgesehen.The present invention is not limited to the above-described embodiments limited, but also includes all within the meaning of the invention equivalent embodiments. So of course is the use other material combinations that have the described properties, or the formation of plunger 6 and bellows 10 in other geometric Shapes provided.

Claims (4)

  1. Process for the production of a plunger (6) for a push button, the push button comprising a housing with an upper part (2) and a lower part (4), a plunger (6) which is arranged such that it can be moved linearly within the housing, can be moved between a rest position and an operating position and which is acted on with a spring force counter to its direction of actuation by a spring element (8), and also comprising a rolling bellows (10) arranged circumferentially on the plunger (6) in order to seal off the interior of the housing, and the plunger (6) having at the circumference a circular groove (12) to hold the rolling bellows (10) in a fixed manner, characterized in that first of all the moulding compound of the plunger (6) and then the thermoplastic moulding compound of the rolling bellows (10) are injected into a common mould, the moulding compound for the rolling bellows (10) being injected around the plunger (6), the materials of plunger (6) and rolling bellows (10) being selected such that the two materials do not enter into any adhesive combination with each other but are joined to each other in the course of a force-fitting or shrunk connection, and the rolling bellows (10) being of trumpet-like design in order to optimize its rolling properties on the plunger body.
  2. Process according to Claim 1, characterized in that in the area of the circumferential groove (12), the accumulation of material of the rolling bellows (10) is greater by at least the factor 2 than in the remaining area.
  3. Process according to one of the preceding claims, characterized in that the moulding compound for the plunger (6) consists of polycarbonate.
  4. Process according to one of the preceding claims, characterized in that the moulding compound for the rolling bellows (10) consists of a styrene-ethylene-butylene-styrene compound.
EP99973660A 1999-02-01 1999-11-09 Push button Revoked EP1151451B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19903838 1999-02-01
DE19903838A DE19903838C1 (en) 1999-02-01 1999-02-01 Push-button, especially for electrical control unit has pressure piece and surrounding collar seal produced by two-component injection of plastics which form no adhesive bond
PCT/EP1999/008589 WO2000046825A1 (en) 1999-02-01 1999-11-09 Push button

Publications (2)

Publication Number Publication Date
EP1151451A1 EP1151451A1 (en) 2001-11-07
EP1151451B1 true EP1151451B1 (en) 2003-01-22

Family

ID=7895977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99973660A Revoked EP1151451B1 (en) 1999-02-01 1999-11-09 Push button

Country Status (6)

Country Link
EP (1) EP1151451B1 (en)
CN (1) CN1129155C (en)
AT (1) ATE231648T1 (en)
AU (1) AU1382000A (en)
DE (2) DE19903838C1 (en)
WO (1) WO2000046825A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20010302A1 (en) 2001-02-14 2002-08-14 Whirlpool Co CONSTRUCTION OF BUTTONS FOR ELECTRONIC ELECTRICAL AND / OR MECHANICAL APPLICATIONS
DE10116587C1 (en) * 2001-04-03 2002-09-12 Elan Schaltelemente Gmbh & Co Switch or signaling device, for use in foodstuffs, medical and pharmaceutical industries, especially push button, has conical collar connected to button or to sealing collar between it and casing
CN100578706C (en) * 2007-01-08 2010-01-06 左天乔 Totally sealed electric switch
CN104966634B (en) * 2015-07-02 2017-08-18 惠州冠泰电子有限公司 A kind of key switch dustproof construction

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1155183B (en) * 1958-03-14 1963-10-03 Siemens Ag Push button drive for electrical switchgear
US4155972A (en) * 1977-09-06 1979-05-22 Keystone Consolidated Industries, Inc. Multiple-shot method of molding plastic products
EP0328850A3 (en) * 1988-02-16 1990-09-26 TSCHUDIN & HEID AG Splash proof push button switch
CH679093A5 (en) * 1989-06-23 1991-12-13 Fela Planungs Ag
DE4208087C1 (en) * 1992-03-13 1993-04-29 K.A. Schmersal Gmbh & Co., 5600 Wuppertal, De Electromechanical push-button switch for vehicle door - has groove on outer circumference of cylindrical housing for snap-fitting O=ring installed on door or similar
GB9225052D0 (en) * 1992-11-30 1993-01-20 Burgess Micro Switch Co Ltd Electric switch
DE19646474B4 (en) * 1996-11-11 2007-09-06 Marquardt Gmbh Electric switch

Also Published As

Publication number Publication date
ATE231648T1 (en) 2003-02-15
CN1334958A (en) 2002-02-06
EP1151451A1 (en) 2001-11-07
WO2000046825A1 (en) 2000-08-10
DE59904124D1 (en) 2003-02-27
AU1382000A (en) 2000-08-25
DE19903838C1 (en) 2000-07-20
CN1129155C (en) 2003-11-26

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