US3719788A - Switch having ganged contacts mounted on opposite sides of circuit board - Google Patents

Switch having ganged contacts mounted on opposite sides of circuit board Download PDF

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Publication number
US3719788A
US3719788A US00112583A US3719788DA US3719788A US 3719788 A US3719788 A US 3719788A US 00112583 A US00112583 A US 00112583A US 3719788D A US3719788D A US 3719788DA US 3719788 A US3719788 A US 3719788A
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US
United States
Prior art keywords
movable
contacts
switch
support plate
circuit board
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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 - Lifetime
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US00112583A
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English (en)
Inventor
K Holland
A Sprando
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Tektronix Inc
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Tektronix Inc
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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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/001—Electromechanical switches for setting or display
    • G04C3/005—Multiple switches
    • 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
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support
    • 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

Definitions

  • ABSTRACT A switch apparatus including a pair of movable contacts separately mounted on opposite sides of an etched circuit board and ganged together by a loose coupling including a coupling member ex- 7 tending through a hole in such circuit board.
  • Fixed contacts are provided as conductive strips on both sides of the circuit board and the movable contacts are moved in and out of engagement with such fixed contacts by a rotary cam actuator mounted on such circuit board.
  • acam follower surface is provided on one of a pair of insulator members joining the movable contacts to mounting springs, while in another embodiment the cam follower surface is provided on one end on the coupling member and such coupling member extends through a hole in the support portion of one of the movable contacts, while its other end engages the support portion of the other movable contact.
  • the movable contacts may be short circuiting contacts each including a pair of spaced leg portions through which current flows in opposite directions to produce opposing fields which reduce the contact inductance.
  • the subject matter of the present invention relates surface provided on the coupling member or on an ingenerally to electrical switch apparatus, and in particular, to switch apparatus including a pair of ganged movable contacts mounted on the opposite sides of an insulator plate, such as an etched circuit board, having fixed contacts provided thereon,--such as conductive strips coated on the circuit board.
  • the movable contacts are ganged together by a loose coupling including a movable coupling member extending through a hole in such circuit board.
  • Rotary cam actuating means mounted onone side of the circuit board may be employed to move the movable contacts by engagement with a cam follower surface provided either on an insulator member joining the movable contact to a mounting spring or on one end of the coupling member.
  • cam actuation of onemovable contact toward the circuit board causes the other movable contact to be moved away from the circuit board.
  • the movable contact is joined through an insulator member to a mounting spring to insulate such contact which lowers the stray capacitance of such movahis contact.
  • the inductance and the stray capacitance of the contacts is much greater than that of the present invention so that such prior switch apparatus is not capable of as good a high frequency response.
  • the switch apparatus of the present invention has low contact resistance and low open switch capacitance. As compared to previous switch apparatus having cam actuated contacts mounted on one side of the circuit board, the present invention is more compact and requires less operating force, while at the same time, having a long useful lifetime and a relatively inexpensive construction.
  • Another object is to provide such a switch apparatus in which the movable contacts are separately mounted by different mounting springson opposite sides of a circuit board and are ganged together for simultaneous movement of both of such contacts by means of a common actuator.
  • An additional object of the present invention is to provide such a switch apparatus in which the movable contacts are ganged together by a loose coupling means in the circuit board which enables relative movement between the movable contacts.
  • Still another object of the invention is to provide such a switch apparatus in which the movable contacts are insulated from their mounting springs by insulator members to provide the movable contact with a low stray capacitance and a low inductance.
  • a still further object of the present invention is to provide such a switch apparatus in which each movable contact acts as a short-circuiting switch between two fixed contacts and is provided with two spaced leg portions through which current flows in opposite directions to produce opposing fields which reduce the contact inductance.
  • FIG. 1' is a perspective plan view of one embodiment of the switch apparatus of the present invention with parts broken away for purposes of clarity;
  • FIG. 2 is an enlarged sectional view taken along the line 2-2 of FIG. 1.
  • FIG. 3 is a sectional view of a portion of another embodiment of the switch apparatus of the present invention employing a different type of cam follower and coupling means;
  • FIG. 4 is a sectional view taken along the line 4-4 of FIG. 3.
  • one embodiment of the switch apparatus of the present invention includes a pair of movable switch contacts 10 and 12 joined through insulator members 14 and 16 to one end of leaf spring mounting members 18 and 20.
  • the movable contacts are separately mounted on opposite sides of an etched circuit board 22 by attaching the other ends of mounting springs 18 and 20 to the circuit board with a common rivet eyelet24 extending through an aperture in such circuit board.
  • the movable contacts 10 and 12 are ganged together by a coupling member 26 of insulating material extending through an opening 28 in the circuit board and loosely coupling the two insulator members 14 and 16.
  • a coupling member 26 of insulating material extending through an opening 28 in the circuit board and loosely coupling the two insulator members 14 and 16.
  • a spacer portion 29 projects from insulator 16 into contact with the circuit board 22 in the closed position of movable contact 12 to set the proper amount of bending of such contact.
  • each of the movable contacts and 12 is provided with a pair of leg portions 30 and 32 which are spaced apart and extend substantially parallel from their free ends to their other ends joined in common to the insulator 14 or 16.
  • the leg portions 30 and 32 have bifurcated contacts at their free ends for engagement with two fixed contacts 34 and 36, respectively, provided as spaced metal strips coated on both sides of the circuit board 22.
  • the movable contacts 10 and 12 each short circuit the two fixed contacts 34 and 36 when such movable contacts engage such fixed contacts.
  • the two pairs of fixed contacts 34 and 36 on opposite sides of the circuit board are displaced with the upper pair being positioned to the left of the lower pair to reduce the capacitance between such pairs of contacts.
  • the movable contacts 10 and 12 are insulated from their mounting springs 18 and which lowers the stray capacitance between such movable contacts and the environment as well as reducing the inductance of such contacts.
  • the open circuit capacitance between the movable contacts and the fixed contacts is also reduced because it is formed by two capacitances connected in series.
  • the result is a switch apparatus which is capable of an extremely high frequency response, for example, up to 5 gigahertz. This enables the switch to be employed to connect two 50 ohm characteristic impedance strip line type transmission lines together which may be formed by conductive strips on opposite sides of the circuit board 22.
  • the switch apparatus can also be used as a low impedance or high impedance attenuator switch with equally good results because it has a low stray capacitance providing a high impedance in parallel with the attenuator elements.
  • a common actuating means such as a rotary cam drum 38, is employed to actuate the switch apparatus of FIGS. 1 and 2 by engagement with a cam follower projection 40 on the insulator member 14.
  • the cam drum 38 is of a suitable plastic material and has cam projections 42 molded into its outer surface.
  • Such cam drum is rotated by a control shaft 44 connected at one end to the cam drum and at its other end to a knob 46.
  • the control shaft 44 and the cam drum 38 are mounted on the circuit board 22 by a suitable mounting means 48 atthe opposite ends of such drum to provide unitary switch apparatus.
  • the mounting means 48 may be similar to that shown in co-pending U. S. application, Ser. No. 765,597, filed Oct. 7, 1968, by Vollum et al., now U.S.
  • FIGS. 3 and 4 Another embodiment of the present invention is shown in the FIGS. 3 and 4 which is similar to that previously described except that it employs a different coupling member 50 and different movable contacts 52 and 54 which are formed integral with their mounting springs out of a single piece of metal.
  • the coupling member 50 is provided with a cam follower surface on an enlarged head portion 56 of conical configuration at one end of such coupling member by molding it out of a suitable plastic material.
  • the coupling member extends through a hole in the mounting spring portion of the upper movable contact 52 and on through the opening 28 in the circuit board 22 so that its other end engages the lower movable contact 54 at its mounting spring portion.
  • Rotation of the cam drum 38 brings a cam projection 42 into engagement with the cam follower surface 56 and causes the coupling member 50 to move downward.
  • the coupling member 50 then closes movable contact 52 after opening movable contact 54.
  • the movable contacts 52 and 54 each have spaced parallel leg portions 30' and 32' which are similar to those of FIG. 1, but are not bifurcated. These leg portions 30 and 32' engage fixed contacts 34 and 36 provided as metal strips coated on the surface of the circuit board 22. These metal strips may be provided with gold plating in the contact areas since such strips are usually made of copper, in order to improve their electrical characteristics. It should also be noted that while the movable contacts 52 and 54, and their spring mounting portions are electrically connected together and not insulated from each other like the embodiment of FIG. 1, the two movable contacts may be insulated from each other by fastening the leaf springs with separate solder connections rather than the common rivet 24 of FIG. 1.
  • movable contacts are shown as shorting switches for interconnecting the two fixed contacts 34 and 36 as shown in FIG. 4, they may also be used to electrically connect a single fixed contact to a terminal strip connect to,the fixed end of the leaf spring.
  • another common actuator such as a sliding cam actuator mechanism, can be employed rather than the rotary cam drum 38.
  • Switch apparatus comprising:
  • a pair of movable switch contacts mounted by two separate resilient mounting means on said opposite sides of said support plate for movement between a closed position engaging said fixed contacts and an open position spaced from said fixed contacts, said movable contacts being each attached to said resilient mounting means through an insulator member, and;
  • a movable coupling member extending through an opening in said support plate to couple said movable contacts together and operate them as ganged contacts.
  • Switch apparatus in accordance with claim 1 in which the support plate is a circuit board with the fixed contacts being metal layers on said circuit board and the actuator means is a cam actuator means.
  • the cam actuator means includes a rotary cam member. mounted on the circuit board and the two mounting means are spring members attached to opposite sides of the circuit board.
  • the cam actuator means includes a cam follower of plastic insulating material which moves at least one of the movable contacts between said open and closed positions when said cam follower is engaged by said cam member.
  • Switch apparatus in accordance with claim 6 in which the other insulator member is provided with a spacer portion projecting toward the circuit board which engages the circuit board in the closed position of the movable contact connected to said other insulator member to set the amount of bending of such movable contact in said closed position.
  • Switch apparatus comprising:
  • a pair of movable switch contacts mounted by two separate mounting means on said opposite sides of a said support plate for movement between a closed position engaging said fixed contacts and an open position spaced from said fixed contacts;
  • common actuator means including a movable cam member for moving both of said movable contacts toward andaway from said support plate between said open and closed positions;
  • said actuator means also including a movable coupling member with a cam follower portion engagedby said cam member extending through an opening in said support plate to couple said movable contacts together and operate them as ganged contacts.
  • Switch apparatus in'accordance with claim 8 in which the coupling member loosely couples the movable contacts for; movement together while enabling relative movement between said movable contacts.
  • switch apparatus in accordance with claim 8 in which the support plate is a circuit board with the fixed contacts being metal layers on said circuit board and the actuator means is a cam actuator means.
  • the cam actuator means includes a cam follower of plastic insulating material which moves at least one of the movable contacts between said open and closed positions when said cam follower is engaged by said cam member.
  • Switch apparatus in accordance with claim 12 in which the movable contacts have spring mounting portions attached to said circuit board, and the cam follower is provided as a cam engaging portion of one end of said coupling member, said coupling member extending through a hole in one of said spring portions and engaging the other of said spring portions with its larged head portion having the cam follower portion thereon.
  • Switch apparatus comprising:
  • movable switch contact means mounted by resilient mounting means on said support plate for movement between a closed position engaging said fixed switch contact means and an open position spaced from said fixed switch contact means, said movable switch contact means being connected to said resilient mounting means through insulation means and said insulation means including means to couple said movable switch contact means together;
  • common actuator means for moving said plurality of movable switch contact means toward and away from said support plate between said open and closed positions including actuator-engaging means provided by said insulation means for engagement by said common actuator means to operate said plurality of movable switch contact means as ganged switch contact means.
  • Switch apparatus comprising! a support plate of insulating material
  • a plurality of movable switch means including resilient mounting means mounting said movable switch means on said support plate and movable switch contact means for movement between a closed position engaging said fixed switch contact means and an open position spaced from said fixed switch contact means;
  • insulation means extending between said plurality of movable switch means for coupling (connecting) said movable switch means together;
  • common actuator means for moving said plurality of movable switch means toward and away from said support plate between said open and closed positions including actuator-engaging means provided by said insulation means for engagement by said common actuator means to operate said plurality V nected to said insulation means and another end defining contact-engaging means for engagement with said fixed switch contact means, said insulation means insulating said resilient mounting means from said contact element means;
  • actuator means for moving said movable switch contact means toward and away from said support plate between open and closed contact positions including actuator-engaging means provided by said insulation means for engagement by said actuator means to operate said movable switch contact means between said open and closed positions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Push-Button Switches (AREA)
  • Contacts (AREA)
  • Switches With Compound Operations (AREA)
US00112583A 1971-02-04 1971-02-04 Switch having ganged contacts mounted on opposite sides of circuit board Expired - Lifetime US3719788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11258371A 1971-02-04 1971-02-04

Publications (1)

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US3719788A true US3719788A (en) 1973-03-06

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US00112583A Expired - Lifetime US3719788A (en) 1971-02-04 1971-02-04 Switch having ganged contacts mounted on opposite sides of circuit board

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Country Link
US (1) US3719788A (en, 2012)
JP (2) JPS534229B1 (en, 2012)
CA (1) CA943172A (en, 2012)
DE (1) DE2205114C3 (en, 2012)
FR (1) FR2124457B1 (en, 2012)
GB (1) GB1361541A (en, 2012)
NL (1) NL159224B (en, 2012)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900711A (en) * 1973-05-17 1975-08-19 Tektronix Inc Electrical contactor assembly for high frequency applications
US3975896A (en) * 1973-12-24 1976-08-24 Citizen Watch Co., Ltd. Switching device for electronic timepiece
US4103132A (en) * 1976-10-05 1978-07-25 Unimax Switch Corporation Rotary switch
US4204098A (en) * 1976-03-17 1980-05-20 Tektronix, Inc. Multiple circuit switch assembly
US4396812A (en) * 1981-12-02 1983-08-02 Gould, Inc. Electric, key-controlled switch lock
DE3425473A1 (de) * 1983-07-18 1985-01-31 Hosiden Electronics Co., Ltd., Yao, Osaka Mehrfachschalter mit drehbarem schaltglied
US4525697A (en) * 1982-12-13 1985-06-25 Eaton Corporation Thermally responsive controller and switch assembly therefor
US4629842A (en) * 1984-03-21 1986-12-16 Societe Anonyme D.B.A. Electric contactor for pneumatic servomotor for braking
WO1988003322A1 (en) * 1986-10-22 1988-05-05 Conair Corporation Modular watertight switch for use in personal care appliances
EP0242441A3 (en) * 1986-04-21 1988-10-12 Tektronix, Inc. Switch device
US4871893A (en) * 1988-07-29 1989-10-03 Lightolier, Inc. Slide control switch
AT394638B (de) * 1985-03-28 1992-05-25 Licentia Gmbh Nulleiter-trennvorrichtung
DE4041697A1 (de) * 1990-12-24 1992-07-02 Braun Ag Haarpflegegeraet
DE9319762U1 (de) * 1993-12-22 1995-04-20 Merit-Elektrik GmbH, 51643 Gummersbach Schalter, insbesondere Druck-, Schiebe- oder Stößelschalter
US5596180A (en) * 1995-04-03 1997-01-21 Itt Automotive, Inc. Ignition switch with electrically conductive leaf spring members and rotary cam operator
US5794766A (en) * 1995-08-08 1998-08-18 Teikoku Tsushin Kogyo Co., Ltd. Rotary switch
US5955711A (en) * 1998-03-31 1999-09-21 Itt Manufacturing Enterprises, Inc. Ignition switch with segmented rotary actuation for constrained packaging environment
US6069332A (en) * 1995-04-03 2000-05-30 Itt Automotive, Inc. Apparatus for retaining and aligning an electrical switch housing in a cast housing member
WO2000046821A1 (de) * 1999-02-06 2000-08-10 Eaton Corporation Kontaktfeder-einheit für einen elektrischen schalter
US6350970B1 (en) * 1999-05-07 2002-02-26 Salton, Inc. Appliance switching mechanism and method
US6534737B1 (en) 2002-02-19 2003-03-18 Onan Corporation Contact closing speed limiter for a transfer switch

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2265361C3 (de) * 1971-02-10 1981-09-24 Tektronix, Inc., 97005 Beaverton, Oreg. Elektrische Schaltervorrichtung für Hochfrequenz mit einr Trägerplatte aus isolierendem Material und einem sich durch ein Loch der Trägerplatte erstreckenden Koppelelement
JPS5548765A (en) * 1978-10-02 1980-04-08 Omron Tateisi Electronics Co Lamp regulator of copying machine
WO1982003723A1 (en) * 1981-04-10 1982-10-28 Roth Johann Electric contact,particularly for printed circuits of small electric appliances
US5004957A (en) * 1989-01-06 1991-04-02 Lee Colortran, Inc. Dimming control circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE959562C (de) * 1944-01-28 1957-03-07 Siemens Ag Druck- oder Kippschalter, insbesondere fuer Geraete der Nachrichtentechnik
GB388532A (en) * 1959-07-02 1933-03-02 Keith Dudley Ulysses Rogers Improvements in or relating to the reception of radio telephony, telegraphy or television
US3562464A (en) * 1968-10-07 1971-02-09 Tektronix Inc Cam actuated switch having movable and fixed contacts on circuit board

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900711A (en) * 1973-05-17 1975-08-19 Tektronix Inc Electrical contactor assembly for high frequency applications
US3975896A (en) * 1973-12-24 1976-08-24 Citizen Watch Co., Ltd. Switching device for electronic timepiece
US4204098A (en) * 1976-03-17 1980-05-20 Tektronix, Inc. Multiple circuit switch assembly
US4103132A (en) * 1976-10-05 1978-07-25 Unimax Switch Corporation Rotary switch
US4396812A (en) * 1981-12-02 1983-08-02 Gould, Inc. Electric, key-controlled switch lock
US4525697A (en) * 1982-12-13 1985-06-25 Eaton Corporation Thermally responsive controller and switch assembly therefor
US4572930A (en) * 1983-07-18 1986-02-25 Hosiden Electronics Co., Ltd. Multiple switch using a rotary actuator
DE3425473A1 (de) * 1983-07-18 1985-01-31 Hosiden Electronics Co., Ltd., Yao, Osaka Mehrfachschalter mit drehbarem schaltglied
US4629842A (en) * 1984-03-21 1986-12-16 Societe Anonyme D.B.A. Electric contactor for pneumatic servomotor for braking
AT394638B (de) * 1985-03-28 1992-05-25 Licentia Gmbh Nulleiter-trennvorrichtung
EP0242441A3 (en) * 1986-04-21 1988-10-12 Tektronix, Inc. Switch device
WO1988003322A1 (en) * 1986-10-22 1988-05-05 Conair Corporation Modular watertight switch for use in personal care appliances
US4839483A (en) * 1986-10-22 1989-06-13 Conair Corporation Modular watertight switch for use in personal care appliances
US4871893A (en) * 1988-07-29 1989-10-03 Lightolier, Inc. Slide control switch
DE4041697A1 (de) * 1990-12-24 1992-07-02 Braun Ag Haarpflegegeraet
DE9319762U1 (de) * 1993-12-22 1995-04-20 Merit-Elektrik GmbH, 51643 Gummersbach Schalter, insbesondere Druck-, Schiebe- oder Stößelschalter
US5596180A (en) * 1995-04-03 1997-01-21 Itt Automotive, Inc. Ignition switch with electrically conductive leaf spring members and rotary cam operator
US6069332A (en) * 1995-04-03 2000-05-30 Itt Automotive, Inc. Apparatus for retaining and aligning an electrical switch housing in a cast housing member
US6220778B1 (en) 1995-04-03 2001-04-24 Valeo Inc. Apparatus for retaining and aligning an electrical switch housing in a cast housing member
US5794766A (en) * 1995-08-08 1998-08-18 Teikoku Tsushin Kogyo Co., Ltd. Rotary switch
US5955711A (en) * 1998-03-31 1999-09-21 Itt Manufacturing Enterprises, Inc. Ignition switch with segmented rotary actuation for constrained packaging environment
WO2000046821A1 (de) * 1999-02-06 2000-08-10 Eaton Corporation Kontaktfeder-einheit für einen elektrischen schalter
US6350970B1 (en) * 1999-05-07 2002-02-26 Salton, Inc. Appliance switching mechanism and method
US6534737B1 (en) 2002-02-19 2003-03-18 Onan Corporation Contact closing speed limiter for a transfer switch

Also Published As

Publication number Publication date
DE2205114C3 (de) 1979-06-13
FR2124457A1 (en, 2012) 1972-09-22
JPS5253280A (en) 1977-04-28
DE2205114B2 (de) 1978-10-05
CA943172A (en) 1974-03-05
DE2205114A1 (de) 1972-10-26
NL7201282A (en, 2012) 1972-08-08
GB1361541A (en) 1974-07-24
JPS534229B1 (en, 2012) 1978-02-15
FR2124457B1 (en, 2012) 1974-12-13
NL159224B (nl) 1979-01-15
JPS5533133B2 (en, 2012) 1980-08-29

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