EP0902450A1 - Drucktaster - Google Patents

Drucktaster Download PDF

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Publication number
EP0902450A1
EP0902450A1 EP98306425A EP98306425A EP0902450A1 EP 0902450 A1 EP0902450 A1 EP 0902450A1 EP 98306425 A EP98306425 A EP 98306425A EP 98306425 A EP98306425 A EP 98306425A EP 0902450 A1 EP0902450 A1 EP 0902450A1
Authority
EP
European Patent Office
Prior art keywords
housing
spacer member
outer peripheral
peripheral portion
frame
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
EP98306425A
Other languages
English (en)
French (fr)
Other versions
EP0902450B1 (de
Inventor
Kazunari Takahashi
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of EP0902450A1 publication Critical patent/EP0902450A1/de
Application granted granted Critical
Publication of EP0902450B1 publication Critical patent/EP0902450B1/de
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
    • H01H13/04—Cases; Covers
    • 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
    • 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
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs

Definitions

  • the present invention relates to a small-sized push-button switch in which a spacer member formed of a rubbery material or the like is disposed between a housing and a frame to improve dustproofness and operating touch.
  • Fig. 4 is a sectional view showing this type of a conventional push-button switch.
  • This conventional push-button switch comprises a housing 1 in which a central fixed contact 2 and a peripheral fixed contact 3 are disposed so as to be spaced on an inner bottom portion of a recess 1a and with terminals 4 and 5 being projected outward from side walls 1b, the terminals 4 and 5 being rendered conductive with the fixed contacts 2 and 3, a circular plate-like metal contact 6 which is in contact with the peripheral fixed contact 3 at all times and which can come into contact with and away from the central fixed contact 2; a spacer rubber 7 whose outer peripheral portion is put on a rib-formed surface 1c present around the recess 1a of the housing 1 and which closes the recess 1a; a frame 8 which is constituted by a metallic plate and which is fixed to the housing 1 while holding down the outer peripheral portion of the spacer rubber 7 toward the rib-formed surface 1c; and a stem 9 mounted on the metal contact 6 through the spacer rubber 7, the
  • the frame 8 is fixed by caulking bosses ld formed on an upper end face of the housing 1. Further, the outer peripheral portion of the spacer rubber 7, which is pressed down from above against the frame 8, is in pressure contact with the rib-formed surface 1c of the housing 1 throughout the whole circumference while the rib-formed surface 1c is allowed to bite into the outer peripheral portion of the spacer rubber.
  • a dustproof structure in which the recess 1a is hermetically sealed with the spacer rubber 7.
  • the central portion of the metal contact 6 is inverted while creating a click touch and comes into contact with the central fixed contact 2, so that the central fixed contact 2 is conducted to the peripheral fixed contact 3 through the metal contact 6 to turn ON the switch.
  • the switch ON if the depressing force against the operating part 9a of the stem 9 is released, the inverted metal contact 6 leaves the central fixed contact 2 and reverts to its original shape by virtue of its own elasticity, so that the switch turns OFF.
  • the stem 9 is pushed up to its initial position by the metal contact 6.
  • the initial position of the stem 9 is determined by abutment of its flange portion with the inner peripheral portion (the circumference of the central hole 8a) of the frame 8. With the frame 8, the stem 9 is prevented from coming off the housing 1.
  • the push-button switch is apt to be caught in the stick or embossed tape due to a frictional resistance of the expanded portion 7a when the push-button switch is taken out from the mounting machine, which has been an obstacle to smooth execution of the automatic mounting.
  • a metallic plate frame which holds down the outer peripheral portion of a spacer member formed of a rubbery material or the like is provided with opposed bent pieces at positions opposed to portions, among the spacer member, which may protrude to the exterior of the housing, to prevent the spacer member from being caught in a packaging stick or embossed tape and thereby permit automatic mounting of the push-button switch to be done always smoothly.
  • a push-button switch comprising a housing having a pair of fixed contacts disposed on an inner bottom portion of a recess; a metal contact disposed within the recess of the housing, the metal contact being in contact with one of the fixed contacts at all times and capable of coming into contact with and away from the other fixed contact; a spacer member formed as an elastic member, an outer peripheral portion of the spacer member being placed around the recess of the housing to prevent the entry of dust into the recess; a metallic frame fixed to the housing while pressing down the outer peripheral portion of the spacer member toward the surface of the housing on which the spacer member is placed; and a stem which can cause the metal contact to be deformed downward when depressed, the stem having an operating part which projects from a central hole of the frame to the side opposite to the recess side, characterized in that the frame is provided with opposed bent pieces which are bent along side walls of the housing and which are opposed to a side end face of the outer peripheral portion of the spacer member.
  • the opposed bent pieces may be formed in an opposed relation to the side end face of the outer peripheral portion of the spacer member at four positions of approximately equal intervals and adjacent to the side walls of the housing. If the external shape of the housing and that of the spacer member are substantially the same, the opposed bent pieces may be formed in an opposed relation to substantially the whole circumference of the side end face of the outer peripheral portion of the spacer member.
  • the push-button switch of this construction is assembled while the portions of the spacer member which is formed of a rubbery material or the like and may protrude to the exterior of the housing are covered with the opposed bent pieces of the frame.
  • the inconvenience in taking out the push-button switch from its package such that the switch is caught in the stick or embossed tape due to a frictional resistance of the spacer member, is difficult to occur.
  • Fig. 1 is a sectional view of a push-button switch embodying the present invention
  • Fig. 2 is a perspective view of a frame shown in Fig. 1.
  • the push-button switch shown in Fig. 1 comprises a housing 10 having a central fixed contact 11 and a peripheral fixed contact 12 spaced from each other on an inner bottom portion of a recess 10a, with terminals (not shown) being exposed to the exterior of the housing from side walls 10b, the terminals being conducted to the fixed contacts 11 and 12; a circular plate-like metal contact 13 disposed in the recess 10a of the housing 10, the metal contact 13 being in contact with the peripheral fixed contact 12 at all times and capable of coming into contact with and away from the central fixed contact 11; a flange-like spacer rubber 14 whose outer peripheral portion is placed on a rib-formed surface 10c present around the recess 10a of the housing 10; a stem 15 integral with the spacer rubber 14 and mounted on the metal contact 13; and a frame 16 formed by a metallic plate having bent retaining pieces 16a and opposed bent pieces 16b, the bent pieces 16a and 16b being bent downward along the side walls 10b of the housing 10, the frame 16 being fixed to the housing 10 while
  • the frame 16 has an external shape which is generally square like the external shape of the housing 10 and, as shown in Fig. 2, the bent retaining pieces 16a are formed at two parallel sides of the frame 16 and the opposed bent pieces 16b are formed four in all at the central portions of the four sides.
  • the paired bent retaining pieces 16a are engaged with stepped engaging portions 10d (see Fig. 1) formed in the side walls 10b of the housing 10, and the opposed bent pieces 16b are opposed to the side end face (outer peripheral surface) of the outer peripheral portion of the spacer rubber 14.
  • the external shape of the spacer rubber 14 is generally circular and therefore the side end face of the outer peripheral portion of the spacer rubber 14 approaches the side walls 10b of the housing 10 at four positions of equal intervals. At these four positions the opposed bent pieces 16b are disposed respectively in an opposed relation thereto.
  • the flange-like spacer rubber 14, which is pressed down from above by the outer peripheral portion of the frame 16, is in pressure contact with the rib-formed surface 10c of the housing 10 while the rib on the rib-formed surface 10c is allowed to bite into the spacer rubber throughout the whole circumference, so that the recess la, which is sealed with both the spacer rubber 14 and the underside of the stem 15, has a dustproof structure of a high hermetic sealability.
  • the push-button switch described above is packaged as stick package or embossed tape package after completion of its assembly, then in mounting the switch onto a circuit board or the like, the switch is automatically taken out from the stick or embossed tape and set to a predetermined position by means of a mounting machine.
  • this automatic mounting operation if the peripheral edge portion of the spacer rubber 14, which is compressed from above by the frame 16, is protruded and exposed from the side walls 10b of the housing 10, its frictional resistance may obstruct the switch taking-out operation by the mounting machine.
  • the opposed bent pieces 16b of the frame 16 are formed at four positions of equal intervals at which the spacer rubber 14 may protrude to the exterior of the housing 10; thus, an improvement is made so as to prevent protrusion and exposure of the spacer rubber 14 to the exterior of the housing 10. Therefore, such an inconvenience as the push-button switch being caught in the stick or embossed tape due to a frictional resistance of the spacer rubber 14 in the automatic switch mounting operation is difficult to occur, and thus a smooth execution of the automatic mounting operation can be ensured.
  • the stem 15 and the spacer rubber 14, which are integral with each other, are combined with the frame 16 and thereafter this combined body is chucked and mounted to the housing 10.
  • the assembling work is performed in this procedure.
  • a proper relative positional relation between the stem 15 and the frame 16 can be established by the opposed bent pieces 16b which come into abutment with the side end face (outer peripheral surface) of the outer peripheral portion of the spacer rubber 14. Therefore, a positional deviation in the assembling stage can be avoided and it is possible to effect an automatic assembling work in high yield.
  • the spacer rubber 14 and the stem 15 are formed integrally in one piece with each other to reduce the number of components used, whereby a great reduction of the product cost can be expected.
  • this push-button switch is the same as in the foregoing conventional product. That is, when the operating part 15a of the stem 15 is pushed a predetermined stroke downward in Fig. 1, the central portion of the metal contact 13 is inverted while creating a click touch and comes into contact with the central fixed contact 11, so that the central fixed contact 11 is rendered conductive with the peripheral fixed contact 12 through the metal contact 13 to turn ON the switch. With the switch ON, if the depressing force for the operating part 15a of the stem 15 is released, the metal contact 13, which was inverted, leaves the central fixed contact 11 and reverts to its original shape by virtue of its own elasticity, so that the switch turns OFF and at the same time the stem 15 is pushed upward to its initial position by the metal contact 13. The initial position of the stem 15 is determined by abutment of the inner peripheral portion of the spacer rubber 14 with the inner peripheral portion (the circumference of the central hole 16c) of the frame 16. With the frame 16, the stem 15 is also prevented from coming off the housing 10.
  • the external shape of the housing is generally square and that of the spacer rubber is generally circular
  • the present invention is also applicable to the case where the external shape of the housing and that of the spacer rubber are almost equal to each other.
  • the housing and the spacer rubber are almost equal in external shape, there is a fear that the side end face (outer peripheral surface) of the outer peripheral portion of the spacer rubber may protrude to the exterior of the housing substantially throughout the whole circumference thereof.
  • a shape of frame as shown in Fig. 2 it is impossible to surely avoid the foregoing inconvenience involved in taking out the push-button switch in the automatic mounting operation.
  • the shape of the metallic plate frame 16 may be made into such a box shape as shown in Fig. 3 in which opposed bent pieces 16b of a large width having the respective one sides as base ends (bent lines) are projected downward from four sides of a top plate portion which is generally square in external shape so as to enclose the outer peripheral surface of the spacer rubber substantially throughout the whole circumference.
  • the frame 16 shown in Fig. 3 is applied to a push-button switch of the type in which bosses formed on the upper end face of the housing are inserted through caulking holes 16d and then caulked to fix the frame to the housing.
  • the present invention which is practiced in such a mode as described above, brings about the following effects.
  • the spacer member formed of a rubbery material or the like, there are portions which may protrude to the exterior of the housing. Since the push-button switch is assembled while the portions are covered with the opposed bent pieces of the frame, such inconvenience as the push-button switch being caught in the package stick or embossed tape due to a frictional resistance of the spacer member is difficult to occur.
  • the spacer member and the stem are formed integrally as one piece, not only the number of components used can be reduced but also a proper relative positional relation between the stem and the frame can be established by the opposed bent pieces which come into abutment with the outer peripheral surface of the spacer rubber. Consequently, a positional deviation in the assembling stage can be avoided, the automatic assembling work can be done in high yield, and it is possible to attain a great reduction of the product cost.

Landscapes

  • Push-Button Switches (AREA)
EP98306425A 1997-09-01 1998-08-12 Drucktaster Expired - Lifetime EP0902450B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP236096/97 1997-09-01
JP9236096A JPH1173839A (ja) 1997-09-01 1997-09-01 押釦スイッチ
JP23609697 1997-09-01

Publications (2)

Publication Number Publication Date
EP0902450A1 true EP0902450A1 (de) 1999-03-17
EP0902450B1 EP0902450B1 (de) 2003-10-22

Family

ID=16995678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98306425A Expired - Lifetime EP0902450B1 (de) 1997-09-01 1998-08-12 Drucktaster

Country Status (6)

Country Link
EP (1) EP0902450B1 (de)
JP (1) JPH1173839A (de)
KR (1) KR100322777B1 (de)
CN (1) CN1107327C (de)
DE (1) DE69819097T2 (de)
TW (1) TW381278B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2800904A1 (fr) * 1999-11-10 2001-05-11 Dav Dispositif de commutation unitaire etanche

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100708894B1 (ko) * 2005-05-13 2007-04-19 인성금속(주) 택트 스위치
JP2007280742A (ja) * 2006-04-06 2007-10-25 Matsushita Electric Ind Co Ltd プッシュオンスイッチ
CN102591038B (zh) * 2012-02-24 2015-09-09 何起富 具led照明的眼镜
CN112204690B (zh) * 2018-05-29 2023-10-20 阿尔卑斯阿尔派株式会社 按压开关
WO2023053554A1 (ja) * 2021-09-28 2023-04-06 パナソニックＩｐマネジメント株式会社 プッシュスイッチ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468542A (en) * 1983-05-16 1984-08-28 Kb Denver, Inc. Keyboard assembly
EP0446088A1 (de) * 1990-03-08 1991-09-11 Sextant Avionique Schalter mit Berührungseffekt und diesen Schalter verwendende Tastatur
US5268542A (en) * 1991-06-05 1993-12-07 Mannesmann Aktiengesellschaft Push button operated multi-step switch including flexible circuit board and extending push element
US5345051A (en) * 1991-03-12 1994-09-06 Alps Electric Co., Ltd. Push-button switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58113229U (ja) * 1982-01-26 1983-08-02 アルプス電気株式会社 押釦スイツチ
US5199557A (en) * 1988-01-28 1993-04-06 Mec A/S Method of producing an electric or electronic component, a method of producing a key and a key

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468542A (en) * 1983-05-16 1984-08-28 Kb Denver, Inc. Keyboard assembly
EP0446088A1 (de) * 1990-03-08 1991-09-11 Sextant Avionique Schalter mit Berührungseffekt und diesen Schalter verwendende Tastatur
US5345051A (en) * 1991-03-12 1994-09-06 Alps Electric Co., Ltd. Push-button switch
US5268542A (en) * 1991-06-05 1993-12-07 Mannesmann Aktiengesellschaft Push button operated multi-step switch including flexible circuit board and extending push element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2800904A1 (fr) * 1999-11-10 2001-05-11 Dav Dispositif de commutation unitaire etanche

Also Published As

Publication number Publication date
JPH1173839A (ja) 1999-03-16
DE69819097D1 (de) 2003-11-27
CN1210348A (zh) 1999-03-10
DE69819097T2 (de) 2004-07-08
CN1107327C (zh) 2003-04-30
TW381278B (en) 2000-02-01
EP0902450B1 (de) 2003-10-22
KR100322777B1 (ko) 2002-05-09
KR19990029355A (ko) 1999-04-26

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