US3842229A - Keyboard pushbutton switch - Google Patents

Keyboard pushbutton switch Download PDF

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Publication number
US3842229A
US3842229A US00376779A US37677973A US3842229A US 3842229 A US3842229 A US 3842229A US 00376779 A US00376779 A US 00376779A US 37677973 A US37677973 A US 37677973A US 3842229 A US3842229 A US 3842229A
Authority
US
United States
Prior art keywords
keybody
contact
bridge member
shaped
engagement
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.)
Expired - Lifetime
Application number
US00376779A
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English (en)
Inventor
H Boulanger
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.)
Texas Instruments Inc
Original Assignee
Texas Instruments 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 Texas Instruments Inc filed Critical Texas Instruments Inc
Priority to US00376779A priority Critical patent/US3842229A/en
Priority to CA202,093A priority patent/CA1010096A/en
Priority to AU70274/74A priority patent/AU7027474A/en
Priority to NL7408664A priority patent/NL7408664A/nl
Priority to FR7423105A priority patent/FR2236263A1/fr
Priority to ES427962A priority patent/ES427962A1/es
Priority to DK360174A priority patent/DK360174A/da
Priority to JP49076865A priority patent/JPS5039418A/ja
Priority to IT51918/74A priority patent/IT1016303B/it
Priority to SU742043559A priority patent/SU620228A3/ru
Priority to DD179695A priority patent/DD113973A5/xx
Priority to BR5523/74A priority patent/BR7405523D0/pt
Priority to RO7479458A priority patent/RO70422A/ro
Priority to CS4791A priority patent/CS178173B2/cs
Priority to DE19742432316 priority patent/DE2432316C3/de
Application granted granted Critical
Publication of US3842229A publication Critical patent/US3842229A/en
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
    • 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
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard

Definitions

  • a desktop keyboard for data encoders, calculators and the like comprises an electrically insulative board having a plurality of contact members and mounting clusters of key switches to provide electrical engagement between pairs of contact members.
  • An electrically conductive bridge member is captured within a key switch housing and slides and pivots in continuous engagement with one contact member of a pair and moves into and out of engagement with the second contact member of a pair upon predetermined movement of the respective key.
  • a single spring member provides both pretravel and overtravel of each key as well as providing the contact force.
  • a plurality of multiposition point switches are also mounted on the board and comprise a contact element slidably movable to any one of a plurality of contact members to provide a selected mode of operation.
  • This invention relates to keyboards and more particularly to keyboard switches especially useful for desktop apparatus.
  • keyboard switches are employed in desktop type apparatus, that is where miniaturization of the switches is not required as in handheld calculators and the like, to provide keys similar to typewriter keys which have significant travel during actuation of the switch and even overtravel after actuation. By depression of a key through most of its stroke, actuation is thus assured. This feature has long since become a required characteristic of such keyboards since operators have become accustomed to it.
  • Such apparatus includes data entry devices, calculators and the like.
  • FIG. 1 is a perspective view of a keyboard device including a plurality of key switch clusters and a plurality of multiposition point switches which are mounted on a printed circuit board;
  • FIG. 2 is a cross sectional view taken on lines 22 of FIG. I showing a key switch in its normally open or contacts disengaged position;
  • FIG. 3 is a cross sectional view similar to FIG. 2 but showing the key switch in its closed or contacts engaged position;
  • FIG. 4 is a perspective view of a movable bridge member used in the key switches of FIGS. 1-3;
  • FIG. 5 is a cross section taken through a portion of the printed circuit board showing a contact member
  • FIG. 6 is a cross sectional plan view taken on lines 66 of FIG. 1 through multiposition point switch 6;
  • FIG. 7 is a perspective view of the contact arrangement of the multiposition switch of FIG. 6.
  • an electrically insulative board has a printed circuit disposed on one surface and a plurality of staple like U-shaped members inserted through apertures from the opposed surface with the free ends of the staple legs terminating in electrical contact with selected portions of the printed circuit.
  • a plurality of key clusters are disposed on the printed circuit board each comprising a plurality of key switches, each switch adapted upon depression to electrically engage a pair of staples.
  • Each key switch comprises an elongated keybody mounted for sliding movement in a guideway of a housing toward and away from stationary contacts or staples mounted on the circuit board.
  • An electrically conductive bridge member is captured in the housing and is biased toward bridging electrical engagement between the pair of staples by a coil spring extending from the keybody to the bridge member.
  • the bridge member is provided with a leg having a distal end disposed within an opening formed by a U-shaped portion extending from the keybody.
  • the key switch is normally open since the spring biases the keybody upwardly lifting the distal end of the bridge member and the bridge member out of engagement with one of the staples of the pair, the bridge member sliding slightly and pivoting on the second staple of the pair. Depression of the switch allows the leg to move down and the bridge member into engagement with the one staple of the pair.
  • FIG. 1 shows a Keyboard I particularly useful in desktop calculator models.
  • a plurality of key clusters 2-5 and a plurality'of multiposition point switches 6-8 all of which are mounted on a circuit board 16.
  • any conventional circuit board including two sided boards may be employed it is preferred to use a board having desired circuitry printed on one side, the bottom side as viewed in FIG. 1, with the required contacts in the form of staple like members disposed on the opposite side of the board with the legs of the staplesextending through apertures in the board and terminating in electrical connection with selected portions of the printed circuitry. It will be realized of course that various other contact members could be employed.
  • Key cluster 3 comprises a housing 14 of a conventional electrically insulative material such as polycarbonate mounted on board 16 in any convenient manner as by use of conventional screw fasteners (not shown).
  • a plurality of key units 12 are formed in housing 14, each unit having a guideway 26 shown in FIGS. 2 and 3.
  • For each key unit 12 a pair of U-shaped electrically conductive contact members in the form of staples 18, 20 are received in apertures provided in electrically insulative board 16 extending from a first surface 22 to a second opposed surface 24.
  • An elongated keybody 28, also of electrically insulative material is slidingly received in guideway 26 and is adapted for movement toward and away from staples 18, 20.
  • Keybody 28 is formed with an axially extending slot 30 in communication with a spring receiving bore 32 at the force transmitting end 34 of keybody 28.
  • An electrically conductive movable bridge member 36 a relatively stiff, inflexible member is disposed in a switch chamber 56 within key unit 14.
  • member 36 has two contact sections 38 and 40 with a leg 42 extending from contact section 40 and terminating at a first distal end 44.
  • a second leg 46 extends from contact section 38 and has a second distal end 48.
  • Intermediate contact sections 38 and 40' is an upwardly bent portion 50.
  • Movable bridge member 36 is disposed in a switch chamber with contact section 38 in engagement with bight 52 of staple 20.
  • a helical coil spring member 58 is also disposed in switch chamber 56 and extends from a spring seat 60 formed by the intersection of slot 30 and bore 32 in keybody 28 to the movable bridge member 36 with the second leg 46 and upwardly bent portion 50 extending into the space defined by spring 58 forming a seat for the spring.
  • Leg 46 cooperates with portion 50 to maintain spring 58 in the desired location.
  • Distal end 48 of leg 46 is provided with a hook portion to facilitate assembly of the device. That is, spring 58 can be placed on movable contact member 36 with distal end 48 hooked over the top of the spring maintaining the spring slightly compressed and holding it in position so that it can be easily handled. Once mounted in the switch distal end 48 is no longer functional since seat 60 of keybody 28 further compresses spring 58 and maintains it away from end 48.
  • Keybody 28 is formed with a laterally projecting U- shaped portion 62 formed by legs 64 (only one being shown) integrally attached to keybody 28 and joined by a bight portion 66.
  • a beveled surface 68 is formed in bight portion 66 which is adapted to engage distal end 44 of leg 42 of movable contact member 36 which is trained through the opening in U-shaped portion 62.
  • spring 58 reacts against bight 52 and the wall of housing 14 through the extreme end portion 70 of contact section 38 and biases keybody 28 upwardly with bight portion 66 camming leg 42 upwardly lifting contact section 40 out of engagement with bight 54 of staple 18.
  • the cam 66 is moved downwardly allowing leg 42 and contact section 40 to move downwardly until contact section 40 comes into engagement with bight 54 of staple 18.
  • Use of the single spring 58 as shown provides both pretravel and overtravel of the keybody. It will also be noted that all of the spring force is directly utilized as contact force.
  • the keybody has approximately 0.150 inches overall travel. Contact engagement occurs after approximately 0.075 inches followed by 0.075 inches overtravel with surface 66 moving away from distal end 44 and spring 58 being further compressed. While bridge member 36 is pivoting on bight portion 52 of staple there is a slight contact wiping occurring at that section since end 70 forces bridge member 36 to slide slightly to the left as seen in FIGS. 2 and 3, upon contact engagement. However, once contact section 40 comes into engagement with bight 54 there is no further sliding movement and hence no electrical noise after contact engagement.
  • Multi'position point switches, 6, 7 and 8 shown in FIG. 1 are of identical structure and hence only one will be discussed in detail.
  • multiposition point switch 6 is illustrated.
  • the switch is shown having six positions, however the particular number of positions is a matter of choice.
  • Housing 80 mounts a slide member 82 thereon and is formed with opposed lips 84 to confine slide 82 to linear sliding movement (right and left as seen in FIG. 6).
  • lntegrally formed with slide member 82 is a knob 86 extending from a raised platform 88 on which a series of serrations 90 is preferably provided to facilitate handling.
  • a series of detents 92 are formed in the bottom surface of slide 82 each being adapted to receive therein a spherical member 94 received in bore 96 formed in housing 80 and biased toward the slide member by a coil spring 98 disposed in bore 96 intermediate member 94 and a bottom wall of the bore forming a spring seat 100.
  • Grooves 102, 104 are formed on opposite sides of housing on the end of the housing received on printed circuit board 16 and receive therein respective opposite L-shaped tab ends 106, 108 of an electrically conductive retainer plate 110.
  • a bore 112 is formed in slide member 82 and lockingly receives the shank 114 of leg 116 depending from slide member 82.
  • Leg 116 extends through a longitudinally extending slot 118 formed in plate and is received in a slot- 120 of a resilient electrically conductive member 122.
  • Resilient member 122 is generally wave shaped having an undulated convex and concave top and bottom surface.
  • a row of contact members such as staples 126 between outer contact members such as staples 128 and 130 are disposed beneath retainerplate' 110 and are arranged so that their bight portions are generally parallel to one another.
  • the legs of staple 126 extend through apertures in board 16 in the same manner as shown in FIG. 5 with at least one leg of staples 126 in electrical connection with a selected portion of the printed circuit.
  • the outer staples 128 and 130 of the row are electrically connected to ends 106, 108 respectively of the retainer plate, however only staple 128 is in electrical connection with the printed circuit.
  • a circuit path Housing 82 may be mounted on board 16 in any convenient manner such as by use of screws 132.
  • a duplicate set of detents 134 extend from the center of slide 82 to the right as seen in FIG. 6 so that spherical member 94 and spring 98 can be located either as shown or in bore 136 if so desired.
  • the design of the keyboard described above is particularly suitable for mass manufacturing techniques.
  • the printed circuit is plated on a surface thereof, the electrical contacts in the form of staples are inserted through apertures provided in the board, the connections are soldered by flow soldering and then the entire board is scrubbed clean with appropriate detergents.
  • the board acts as a support for the several key clusters and multiposition switches which are locked into place, as mentioned supra, as by use of screw fasteners. No jumpers or other connectors are required so that hand work on the keyboard is kept to an absolute minimum.
  • the keyboard is assembled with its switches thereon it is placed in a receiving bezel of a desk top calculator and the circuit board is electrically connected to the other component parts of the apparatus such as for instance, a read only memory (ROM), program counter (PC), instruction register (IR), control decoders and other desired components.
  • ROM read only memory
  • PC program counter
  • IR instruction register
  • control decoders and other desired components.
  • a keyboard switch comprising:
  • an electrically insulative base having opposed first and second surfaces, and having a plurality of apertures extending from the first to the second surfaces;
  • each member having two legs joined by a bight portion, each of the legs received in a respective aperture in the base with the bight portion disposed on the first surface;
  • a keybody having a force receiving end and a force transmitting end
  • a housing disposed over the pair of U-shaped members, the housing having guide means aligned with the U-shaped members, the keybody received in the guide means and movable toward and away from the U-shaped members;
  • a movable electrically conductive bridge member in continuous pivotal contact with the bight portion of one U-shaped member and pivotably movable into and out of engagement with the bight portion of the other U-shaped member;
  • a keyboard switch according to claim 1 in which the conductive bridge member has a first free distal end, the keybody has a portion extending laterally therefrom, the keybody portion formed with a surface adapted to contact the distal end of the conductive bridge member to force the conductive bridge member out of engagement with the bight portion of the other U-shaped member when the keybody is moved away from the U-shaped members.
  • a keyboard switch in which the conductive member has an upwardly extending in termediate portion and the means biasing the keybody includes a helical spring which extends from the keybody to the conductive bridge member with the intermediate portion extending into the space defined by the spring.
  • a keyboard switch in which the portion of the keybody extending laterally therefrom is generally U-shaped having two legs integral with the keybody and a bight portion forming the surface adapted to contact the first distal end of the conductive bridge member, an opening being defined between the U-shaped portion and the remainder of the keybody, the first distal end received in the opening and disposed in engagement with the bight surface.
  • a keyboard switch according to claim 4 in which the bight surface of the keybody is beveled.
  • a keybody switch comprising:
  • a keybody having a force receiving end and a force transmitting end
  • a housing disposed over the pair of contact members, the housing having guide means aligned with the contact members, the keybody received in the guide means and movable therein toward and away from the contact members;
  • a movable relatively stiff inflexible electrically conductive bridge member in continuous pivotal contact with one stationary contact member of the pair and pivotably movable into and out of engagement with the other stationary contact member of the pair;
  • a keyboard switch in which the movable conductive bridge member has a first free distal end, the keybody has a portion extending laterally therefrom, the keybody portion isformed with a surface adapted to contact the distal end of the movable conductive bridge member to force the movable conductive bridge member out of engagement with the other stationary contact member of the pair when the keybody is moved away from the stationary contact members.
  • a keyboard switch in which the movable conductive bridge member has an upwardly extending intermediate portion and the means biasing the keybody includes a helical spring hich extends from the keybody to the movable conductive bridge member with the intermediate portion extending into the space defined by the spring.
  • a keyboard switch in which the portion of the keybody extending laterally therefrom is generally U-shaped having two legs integral with the keybody and a bight portion forming the surface adapted to contact the first distal end of the movable conductive bridge member, and opening being defined between the U-shaped portion and the remainder of the keybody, the first distal end received in the opening and disposed in engagement with the bight surface.
  • a keyboard switch according to claim 9 in which the bight surface of the keybody is beveled.

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  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)
US00376779A 1973-07-05 1973-07-05 Keyboard pushbutton switch Expired - Lifetime US3842229A (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
US00376779A US3842229A (en) 1973-07-05 1973-07-05 Keyboard pushbutton switch
CA202,093A CA1010096A (en) 1973-07-05 1974-06-10 Key switch apparatus
AU70274/74A AU7027474A (en) 1973-07-05 1974-06-20 Key switch apparatus
NL7408664A NL7408664A (nl) 1973-07-05 1974-06-27 Toetsenbordschakelaar.
FR7423105A FR2236263A1 (nl) 1973-07-05 1974-07-03
SU742043559A SU620228A3 (ru) 1973-07-05 1974-07-04 Клавишный переключатель
JP49076865A JPS5039418A (nl) 1973-07-05 1974-07-04
IT51918/74A IT1016303B (it) 1973-07-05 1974-07-04 Perfezionamento nei dispositivi di commutazione elettrica in partico lare per tastiere per calcolatri ci e simili
ES427962A ES427962A1 (es) 1973-07-05 1974-07-04 Perfeccionamientos introducidos en un conmutador de tecla- do.
DD179695A DD113973A5 (nl) 1973-07-05 1974-07-04
BR5523/74A BR7405523D0 (pt) 1973-07-05 1974-07-04 Comutador de teclado
DK360174A DK360174A (nl) 1973-07-05 1974-07-04
CS4791A CS178173B2 (nl) 1973-07-05 1974-07-05
DE19742432316 DE2432316C3 (de) 1973-07-05 1974-07-05 Tastenschalter
RO7479458A RO70422A (ro) 1973-07-05 1974-07-05 Intrerupator cu tasta

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00376779A US3842229A (en) 1973-07-05 1973-07-05 Keyboard pushbutton switch

Publications (1)

Publication Number Publication Date
US3842229A true US3842229A (en) 1974-10-15

Family

ID=23486452

Family Applications (1)

Application Number Title Priority Date Filing Date
US00376779A Expired - Lifetime US3842229A (en) 1973-07-05 1973-07-05 Keyboard pushbutton switch

Country Status (14)

Country Link
US (1) US3842229A (nl)
JP (1) JPS5039418A (nl)
AU (1) AU7027474A (nl)
BR (1) BR7405523D0 (nl)
CA (1) CA1010096A (nl)
CS (1) CS178173B2 (nl)
DD (1) DD113973A5 (nl)
DK (1) DK360174A (nl)
ES (1) ES427962A1 (nl)
FR (1) FR2236263A1 (nl)
IT (1) IT1016303B (nl)
NL (1) NL7408664A (nl)
RO (1) RO70422A (nl)
SU (1) SU620228A3 (nl)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962556A (en) * 1975-01-10 1976-06-08 Texas Instruments Incorporated Keyboard with versatile switch support structures
US4118611A (en) * 1977-08-30 1978-10-03 International Business Machines Corporation Buckling spring torsional snap actuator
US4313685A (en) * 1978-12-14 1982-02-02 Siemens Aktiengesellschaft Push-button switch, particularly for keyboards of typewriters and similar devices
EP0158725A2 (de) * 1984-04-13 1985-10-23 Siemens Aktiengesellschaft Drucktaste
US4704503A (en) * 1985-03-09 1987-11-03 Alps Electric Co., Ltd. Slide-action switch with movable contact lifting means
GB2371022A (en) * 2000-12-29 2002-07-17 Nokia Mobile Phones Ltd A portable communication device
US20040132504A1 (en) * 2000-12-29 2004-07-08 Michael Hague Portable communication device
USD873271S1 (en) * 2019-08-07 2020-01-21 Shenzhen Qianhai Patuoxun Network And Technology Co., Ltd. Keyboard

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58147615U (ja) * 1982-03-29 1983-10-04 日鐵溶接工業株式会社 横置ル−プ状線材の石灰コ−テイング装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910551A (en) * 1957-04-22 1959-10-27 Generald Motors Corp Switch assembly
US3223794A (en) * 1963-11-13 1965-12-14 Indak Mfg Corp Multiple position electrical switch with contact rails and dummy contact pressure stabilizers
US3244847A (en) * 1964-05-22 1966-04-05 Navigation Computer Corp Manually operated keyboard switch in a stationary mount with guided shaftway
US3259721A (en) * 1964-03-19 1966-07-05 Therm O Disc Inc Thermostatic switch with rocking bridging contact
US3387184A (en) * 1965-01-08 1968-06-04 Plessey Co Ltd Electric ignition devices
US3707609A (en) * 1971-10-27 1972-12-26 Texas Instruments Inc Diaphragm pushbutton switch array for keyboards
US3731032A (en) * 1971-10-28 1973-05-01 Us Controls Corp Electrical switch with contact wiping
US3786205A (en) * 1972-05-11 1974-01-15 Becton Dickinson Co Keyboard switch assembly with movable, multi-contact means and associated swinger portions

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910551A (en) * 1957-04-22 1959-10-27 Generald Motors Corp Switch assembly
US3223794A (en) * 1963-11-13 1965-12-14 Indak Mfg Corp Multiple position electrical switch with contact rails and dummy contact pressure stabilizers
US3259721A (en) * 1964-03-19 1966-07-05 Therm O Disc Inc Thermostatic switch with rocking bridging contact
US3244847A (en) * 1964-05-22 1966-04-05 Navigation Computer Corp Manually operated keyboard switch in a stationary mount with guided shaftway
US3387184A (en) * 1965-01-08 1968-06-04 Plessey Co Ltd Electric ignition devices
US3707609A (en) * 1971-10-27 1972-12-26 Texas Instruments Inc Diaphragm pushbutton switch array for keyboards
US3731032A (en) * 1971-10-28 1973-05-01 Us Controls Corp Electrical switch with contact wiping
US3786205A (en) * 1972-05-11 1974-01-15 Becton Dickinson Co Keyboard switch assembly with movable, multi-contact means and associated swinger portions

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962556A (en) * 1975-01-10 1976-06-08 Texas Instruments Incorporated Keyboard with versatile switch support structures
US4118611A (en) * 1977-08-30 1978-10-03 International Business Machines Corporation Buckling spring torsional snap actuator
US4313685A (en) * 1978-12-14 1982-02-02 Siemens Aktiengesellschaft Push-button switch, particularly for keyboards of typewriters and similar devices
EP0158725A2 (de) * 1984-04-13 1985-10-23 Siemens Aktiengesellschaft Drucktaste
EP0158725A3 (en) * 1984-04-13 1986-11-12 Siemens Aktiengesellschaft Berlin Und Munchen Push button
US4704503A (en) * 1985-03-09 1987-11-03 Alps Electric Co., Ltd. Slide-action switch with movable contact lifting means
GB2371022A (en) * 2000-12-29 2002-07-17 Nokia Mobile Phones Ltd A portable communication device
US20040132504A1 (en) * 2000-12-29 2004-07-08 Michael Hague Portable communication device
GB2371022B (en) * 2000-12-29 2005-01-12 Nokia Mobile Phones Ltd A portable communication device
US6965789B2 (en) 2000-12-29 2005-11-15 Vertu Limited Portable communication device
USD873271S1 (en) * 2019-08-07 2020-01-21 Shenzhen Qianhai Patuoxun Network And Technology Co., Ltd. Keyboard

Also Published As

Publication number Publication date
CA1010096A (en) 1977-05-10
SU620228A3 (ru) 1978-08-15
NL7408664A (nl) 1975-01-07
AU7027474A (en) 1976-01-08
DE2432316A1 (de) 1975-01-23
BR7405523D0 (pt) 1975-05-13
JPS5039418A (nl) 1975-04-11
DK360174A (nl) 1975-02-24
RO70422A (ro) 1982-05-10
DD113973A5 (nl) 1975-07-05
IT1016303B (it) 1977-05-30
DE2432316B2 (de) 1977-06-30
FR2236263A1 (nl) 1975-01-31
ES427962A1 (es) 1976-08-16
CS178173B2 (nl) 1977-08-31

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