EP0242441A2 - Schaltapparat - Google Patents

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Publication number
EP0242441A2
EP0242441A2 EP86116653A EP86116653A EP0242441A2 EP 0242441 A2 EP0242441 A2 EP 0242441A2 EP 86116653 A EP86116653 A EP 86116653A EP 86116653 A EP86116653 A EP 86116653A EP 0242441 A2 EP0242441 A2 EP 0242441A2
Authority
EP
European Patent Office
Prior art keywords
resilient member
support member
circuit board
resilient
contact
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.)
Withdrawn
Application number
EP86116653A
Other languages
English (en)
French (fr)
Other versions
EP0242441A3 (de
Inventor
William E. Berg
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.)
Tektronix Inc
Original Assignee
Tektronix Inc
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 Tektronix Inc filed Critical Tektronix Inc
Publication of EP0242441A2 publication Critical patent/EP0242441A2/de
Publication of EP0242441A3 publication Critical patent/EP0242441A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/62—Contacts actuated by radial cams
    • H01H19/626—Contacts actuated by radial cams actuating bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/40—Contact mounted so that its contact-making surface is flush with adjoining insulation
    • H01H1/403—Contacts forming part of a printed circuit
    • 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
    • H01H11/0056—Apparatus or processes specially adapted for the manufacture of electric switches comprising a successive blank-stamping, insert-moulding and severing operation

Definitions

  • This invention relates to a switch device.
  • a preferred switch device embodying the inven­tion comprises a resilient contact member and a support member carrying the contact member.
  • the support member is movable between a first position in which the contact member is in electrically-­conductive contact with two conductor elements that are stationary relative to each other and a second position in which the contact member is spaced from at least one of the conductor elements.
  • a re­silient member urges the support member in the direction from the second position towards the first position.
  • the present invention may be used to provide a switch that is suitable for transmitting high fre­quency signals over a gap between two transmission lines.
  • the contact member is small and therefore introduces only minimal inductance into the signal path when the support member is in its first posi­tion. Accurate alignment of the contact member with the stationary conductor elements is achieved.
  • a contact member 2 comprises a body of elasto­mer material 4 having contact elements 6 of metal adhered thereto.
  • a circuit board 8 has conductor runs 10 at its lower surface and a ground plane 12 on its upper surface. The dimensions and pro­perties of the circuit board 8, the conductors runs 10 and the ground plane 12 are such that the con­ductor runs 10 and the ground plane 12 form trans­mission lines.
  • the circuit board is formed with an opening 14.
  • a guide block 16 of self-lubricating plastic, e.g. nylon or the material sold under the trademark Delrin, is formed with a square-section opening 18 and has pins 20 projecting downwardly from its lower surface. The pins 20 are fitted in holes 15 in the circuit board.
  • the positions of the pins 20 relative to the opening 18 and of the holes relative to the opening 14 are such that the opening 18 of the guide block is aligned with the opening 14 of the circuit board.
  • the guide block 18 is attached to the circuit board 8 by swaging the pins 20.
  • the contact member 2 is attached to the lower end of a square-section support member or plunger 30 that extends upwardly through the open­ings 14 and 18 in the circuit board 8 and the guide block 16.
  • a retainer plate 32 is secured to the plunger 30 at its lower end.
  • the plunger 30 is made of self-lubricating plastic and has an en­larged flange 34 at its upper end, and a spring 36 is fitted on the plunger and is captive between the flange 34 and the upper surface of the guide block 16. The spring thus urges the plunger 30 upwards, drawing the contact member 2 into contact with the underside of the circuit board 8.
  • the plunger 30 has a protuberance 38 that engages the surface of a cam 40 as a cam follower.
  • the cam 40 is mounted to rotate about a shaft 42, and has a peripheral depression 44.
  • the contact member 2 is made by techniques similar to those disclosed in U. S. Patent No. 4,150,420.
  • the contact elements 6 are formed on a 35 mm polyimide tape 50.
  • the tape 50 may have a surface coating of copper that is photo­processed and etched to define strips of copper in the desired positions of the contact elements 6, and gold may then be deposited electrolessly on the strips of copper to form the finished contact ele­ ments.
  • the tape 50 is placed in a molding cavity with the upper surface of the tape (the surface bearing the contact elements 6) towards the ex­terior of the cavity.
  • the die that defines the molding cavity has a wall that is formed with two parallel grooves.
  • An elastomer material is in­jected into the molding cavity behind the tape 50, and the pressure of the elastomer material forces the tape to conform to the contours of the grooved wall of the die.
  • the elastomer material which may be a silicone rubber, adheres strongly to the poly­imide tape 50. Therefore, when the elastomer mate­rial cures there is formed an elongate body 52 comprising elastomer material and polyimide tape, with ridges 56 extending longitudinally of the body 52. Blocks, each having two contact elements, are then cut from the body 52 to form individual con­tact members 2, and a square through-hole 54 is formed in each block, between the two contact ele­ments 6.
  • the plunger 30 is inserted downwardly through the compression spring 36 and the holes 18 and 14 in the block 16 and the circuit board 8, and the contact member 2 is inserted over the project­ing lower end of the plunger.
  • the plunger is formed with a slit at its lower end, and the two branches of the plunger, on opposite sides of the slit, are formed with recesses.
  • the retainer plate 32 is pushed onto the lower end of the plunger, the two branches are forced to­gether and the plate 32 enters the recesses and permits the branches to snap apart.
  • the retainer plate is thereby secured against longitudinal move­ment on the plunger.
  • the contact member 2 is attached to the retainer plate 32 by means of adhesive material.
  • the positioning of the contact elements 6 relative to the conductor runs 10 is accurate and consistent, and the spring force urging the contact elements into engagement with the conductor runs is consistent and is independent of the cam, so long as the depression 44 is deep enough to receive the protuberance 38.
  • the spring 36 is isolated from the conductor runs 10 by the ground plane, and the only conductive material on the same side of the ground plane as the conductor runs is the material of the contact elements.
  • the ridged configuration of the contact member 2 ensures that when the plunger is forced upwards by the spring 36 and contact elements 6 are pressed into contact with the conductor runs 10, a wiping contact is achieved as the elastomer material is compressed.

Landscapes

  • Push-Button Switches (AREA)
EP86116653A 1986-04-21 1986-12-01 Schaltapparat Withdrawn EP0242441A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85444286A 1986-04-21 1986-04-21
US854442 1986-04-21

Publications (2)

Publication Number Publication Date
EP0242441A2 true EP0242441A2 (de) 1987-10-28
EP0242441A3 EP0242441A3 (de) 1988-10-12

Family

ID=25318709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86116653A Withdrawn EP0242441A3 (de) 1986-04-21 1986-12-01 Schaltapparat

Country Status (2)

Country Link
EP (1) EP0242441A3 (de)
JP (1) JPS62256324A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622818A3 (de) * 1993-04-28 1995-08-02 Becker Gmbh Tastschalter.
GB2420448A (en) * 2004-11-19 2006-05-24 Invensys Controls Uk Ltd Switching mechanism

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4216653Y1 (de) * 1966-10-17 1967-09-26
US3719788A (en) * 1971-02-04 1973-03-06 Tektronix Inc Switch having ganged contacts mounted on opposite sides of circuit board
GB1539470A (en) * 1975-11-13 1979-01-31 Tektronix Inc Electrical connector
US4559419A (en) * 1984-08-15 1985-12-17 The United States Of America As Represented By The Secretary Of The Army Coding switch assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622818A3 (de) * 1993-04-28 1995-08-02 Becker Gmbh Tastschalter.
GB2420448A (en) * 2004-11-19 2006-05-24 Invensys Controls Uk Ltd Switching mechanism
GB2420448B (en) * 2004-11-19 2007-11-28 Invensys Controls Uk Ltd Switching mechanism

Also Published As

Publication number Publication date
JPS62256324A (ja) 1987-11-09
EP0242441A3 (de) 1988-10-12

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Effective date: 19910218

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Inventor name: BERG, WILLIAM E.