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US3641286A - Electromechanical keyboard independently operated switch mechanism with improved conductive resilient actuating means - Google Patents

Electromechanical keyboard independently operated switch mechanism with improved conductive resilient actuating means Download PDF

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Publication number
US3641286A
US3641286A US77900A US3641286DA US3641286A US 3641286 A US3641286 A US 3641286A US 77900 A US77900 A US 77900A US 3641286D A US3641286D A US 3641286DA US 3641286 A US3641286 A US 3641286A
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conductive
board
key
code
keys
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US77900A
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Jaroslaw Berezowski
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SELECTRO CORP
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SELECTRO CORP
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    • 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
    • H01H13/7006—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 comprising a separate movable contact element for each switch site, all other elements being integrated in layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2235/00—Springs
    • H01H2235/01—Spiral spring

Definitions

  • This invention relates to a multicontact switch in its form of a keyboard for converting digital information into a code, suitag "200/5 179/90 200/ ble for a particular data processing method.
  • Information to be I I I I s I I v v 1 l s u v I. be a [58] Field of g g k i 3& 8 suitable for use with the particular processing method.
  • l 1 69 are various codes in common use, such as numeric code, alphanumeric, binary, decimal-binary which is coded with or [56] References cued without auxiliary functions, duodecimal, hexidecimal binary UNITED STATES PATENTS code, etc.
  • the actual coding 18 generally done by complex elec- 3,2 l Dorsey tronic devices resembling a code generator 3,190,975 6/1965 King, Jr. ..200/5 R X 3,536,877 10/ 1970 Von Fange et a1 ..200/ 166 PC 4 Claims, 7 Drawing Figures ' ⁇ w t46 3o 39 PAIENTEUFEB 81972 3.641.286
  • This invention relates to a multicontract switch in its form of a keyboard for converting digital information into a code, suitable for a particular data processing method. Information to be usable in such equipment, must first be converted into a code, suitable for use with the particular processing method. There are various codes in common use, such as a numeric code, alphanumeric, binary, decimal-binary, hexidecimal binary code, etc. Although an apparatus having keys is used for this purpose, the actual coding is generally done by complex electronic devices resembling a code generator.
  • An important object of the present invention is to provide a multicontact switch, with keys resembling a keyboard, which does the coding directly by electromechanical means. For this purpose, no electronic code generators or logic circuits are required.
  • the coding in accordance with the present invention is accomplished by depressing a key which moves a multifinger contact against a particular printed circuit board configuration, the design of which depends upon the code desired. The arrangement is such as to reduce the cost and complexity in a device of this character.
  • Another feature of the invention is a multicontact keyboard which has a considerable measure of versatility to accommodate various codes. This is accomplished by providing means for receiving various printed circuit boards, which may have different circuits on both sides of the board. Trackways provide for ready insertion and removal of the board. Each board has conductive areas for contact with one or more of the key contact fingers. Terminal contacts for connection to an external circuit are provided on a board extension. As a result, electromechanical coding of many varieties can be achieved.
  • FIG. I is a plan view of the assembled keyboard
  • FIG. 2 is a side elevation thereof taken on the line 2-2 of FIG. 1;
  • FIG. 3 is a vertical section showing an assembly of an individual key in a coding arrangement
  • FIG. 4 shows a bottom plan view of the four-finger contact taken on the line 44 of FIG. 3;
  • FIG. 5 is a side elevation thereof taken on the line 5-5 of FIG. 3;
  • FIG. 6 is a plan view of a printed circuit board with coded circuit layout
  • FIG. 7 is a perspective view of the lower side of a portion of the key.
  • FIGS. 1, 2 and 3 there is shown the board 10 with 12 keys I], each with a digit imprinted on its bevelled upper face, the digits in this case running from 1 to 12 with 0 in place of 10.
  • Each key is mounted in a top plate which has a plurality of circular holes 12, one for each key.
  • the key is generally square in plan view and has a circular shank l4 slidably received in the hole 12, the latter having opposed square notches 15, which receive resilient retaining hooks 16. These hooks extend downwardly adjacent to the lower face of the key.
  • retaining hooks are located in sidewall recesses 18 in the shank and have bevelled terminals 19 at the ends of the hook portion 20 to cause the resilient members to retract as they are pushed into the hole where the hook portions underlie the lower face of the top plate and prevent removal of the key.
  • a plate 22 of resilient sheet metal has four fingers 24 forming electrical contacts.
  • the plate is secured to the lower face of key shank 14 by means of a pin 26 having a knurled section 28 which is secured within an axial opening 29 in a bushing 30.
  • the pin extends through the top of the bushing and into an axial bore 31 in the key shank 14.
  • An enlarged tapered head 32 is received in force fit relation near the upper end of the bore 31, thus securing the key rigidly at the upper end of the pin with the contact plate 22 interposed therebetween.
  • the contact fingers 24 are bent downwardly at their ends to a generally C-shaped configuration shown at 25.
  • pins 27 (FIG. 4) carried by the key pass through the plate.
  • the lower end of the bushing 30 has a counterbore 29, the pin 26 and the bushing forming a plunger assembly which with the key is returned upwardly by a coiled compression spring 36 engaging a shoulder 37 at the upper end of the counterbore.
  • the spring engages a circuit board 38 mounted in spaced relation to the top plate 10 by means of machine screws 40 and spacer bushings 41.
  • This board has a conductive surface 39 engaged by the spring 36 so that in addition to providing resilient means for returning the key, the spring provides an electrical connection with the conductive surface which is a common ground.
  • the board also has an opening 42 to receive the lower end of the pin 26.
  • a printed circuit board 44 is mounted in spaced relation between the top plate 10 and board 38 by means of the screws 40 and bushings 41 and the printed circuit board has an opening 46 to receive the bushing conductive free sliding relation.
  • the top plate is mounted in secured relation in a continuous sidewall 48 of a housing with a lower wall 50.
  • the sidewall has an opening 51 for a side extension 52 of the printed circuit board 44.
  • the board is copper clad on its upper face which is suitably etched to form a desired pattern of contacts 53 to be engaged by the spring fingers 24 when a key is depressed and conductive paths 54 established.
  • the conductive paths terminate in the conductive strips 55 to which wires may be attached.
  • the side extension 52 may also be used as an electrical plug and inserted into an appropriate socket (not shown) containing matching connecting strips.
  • the code is contained in the arrangement of conductive segments 53 grouped about the hole 46 on the circuit board. There are four contact ends 25 which are lowered each time the key 11 is depressed and these ends connect the segments 53 to the common conductor 39. A suitable source of potential and a series of utilization loads connected between the strips 55 and the potential source provide the desired coded transfer.
  • a manually operated code switch for converting digital information into a desired pulse code comprising:
  • a flat conductive board mounted within said housing and parallel to the face thereof;
  • a conductive resilient means coupled between each spring contact and said conductive board for connecting all of the spring contacts to a common terminal and for retuming all the keys to their unactuated position after being manually depressed;
  • a code switch as claimed in claim 1 wherein there are at least 10 keys and each is provided with a helical conductive spring surrounding the shaft for connecting the spring contacts with the flat conductive board.
  • a code switch as claimed in claim 1 wherein all the spring contacts are respectively secured to the bottom of each key by conductive bushings, said bushings each forming a contact terminal for one end of said'conductive springs.

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  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

This invention relates to a multicontact switch in its form of a keyboard for converting digital information into a code, suitable for a particular data processing method. Information to be usable in such equipment, must first be converted into a code, suitable for use with the particular processing method. There are various codes in common use, such as numeric code, alphanumeric, binary, decimal-binary which is coded with or without auxiliary functions, duodecimal, hexidecimal binary code, etc. Although an apparatus having keys is used for this purpose, the actual coding is generally done by complex electronic devices resembling a code generator.

Description

O United States Patent [151 3,641,286
Berezowski Feb. 8, 1972 [54] ELECTROMECHANICAL KEYBOARD 3,005,055 10/1961 Mattke ..179/90 K INDEPENDENTLY OPERATED SWITCH 3,214,527 10/ 1965 Dauphinee MECHANISM WITH IMPROVED 3,399,287 8/1968 Euler ..200/159 R R MEANS 3,035,211 5/1962 Mitchell 3,080,457 5/1963 .lansson et al. [72] Inventor: Jaroslaw Beruowski, Greenwich, Conn.
Primary Examiner.l. R. Scott [73] Asmgnee: Sekcm Cwporauon, Mamamneck Attorney-James M. Heilman and Heilman and l-leilman [22] Filed: Oct. 5, 1970 ABSTRACT [211 App]. No.: 77,900 1 This invention relates to a multicontact switch in its form of a keyboard for converting digital information into a code, suitag "200/5 179/90 200/ ble for a particular data processing method. Information to be I I I I s I I v v 1 l s u v I. be a [58] Field of g g k i 3& 8 suitable for use with the particular processing method. There 2 l 1 69 are various codes in common use, such as numeric code, alphanumeric, binary, decimal-binary which is coded with or [56] References cued without auxiliary functions, duodecimal, hexidecimal binary UNITED STATES PATENTS code, etc. Although an apparatus having keys is used for this purpose, the actual coding 18 generally done by complex elec- 3,2 l Dorsey tronic devices resembling a code generator 3,190,975 6/1965 King, Jr. ..200/5 R X 3,536,877 10/ 1970 Von Fange et a1 ..200/ 166 PC 4 Claims, 7 Drawing Figures '\\w t46 3o 39 PAIENTEUFEB 81972 3.641.286
SHEET 2 0F 2 INVENTOR JAROSLAW BEREZOWSKI ATTORNEY.
ELECTROMECHANICAL KEYBOARD INDEPENDENTLY OPERATED SWITCH MECHANISM WITH IMPROVED CONDUCI'IVE RESILIENT ACTUATING MEANS BACKGROUND OF THE INVENTION This invention relates to a multicontract switch in its form of a keyboard for converting digital information into a code, suitable for a particular data processing method. Information to be usable in such equipment, must first be converted into a code, suitable for use with the particular processing method. There are various codes in common use, such as a numeric code, alphanumeric, binary, decimal-binary, hexidecimal binary code, etc. Although an apparatus having keys is used for this purpose, the actual coding is generally done by complex electronic devices resembling a code generator.
An important object of the present invention is to provide a multicontact switch, with keys resembling a keyboard, which does the coding directly by electromechanical means. For this purpose, no electronic code generators or logic circuits are required. The coding in accordance with the present invention is accomplished by depressing a key which moves a multifinger contact against a particular printed circuit board configuration, the design of which depends upon the code desired. The arrangement is such as to reduce the cost and complexity in a device of this character.
Another feature of the invention is a multicontact keyboard which has a considerable measure of versatility to accommodate various codes. This is accomplished by providing means for receiving various printed circuit boards, which may have different circuits on both sides of the board. Trackways provide for ready insertion and removal of the board. Each board has conductive areas for contact with one or more of the key contact fingers. Terminal contacts for connection to an external circuit are provided on a board extension. As a result, electromechanical coding of many varieties can be achieved.
In the drawing:
FIG. I is a plan view of the assembled keyboard;
FIG. 2 is a side elevation thereof taken on the line 2-2 of FIG. 1;
FIG. 3 is a vertical section showing an assembly of an individual key in a coding arrangement;
FIG. 4 shows a bottom plan view of the four-finger contact taken on the line 44 of FIG. 3;
FIG. 5 is a side elevation thereof taken on the line 5-5 of FIG. 3;
FIG. 6 is a plan view of a printed circuit board with coded circuit layout;
FIG. 7 is a perspective view of the lower side of a portion of the key.
In FIGS. 1, 2 and 3, there is shown the board 10 with 12 keys I], each with a digit imprinted on its bevelled upper face, the digits in this case running from 1 to 12 with 0 in place of 10. Each key is mounted in a top plate which has a plurality of circular holes 12, one for each key. The key is generally square in plan view and has a circular shank l4 slidably received in the hole 12, the latter having opposed square notches 15, which receive resilient retaining hooks 16. These hooks extend downwardly adjacent to the lower face of the key. These retaining hooks are located in sidewall recesses 18 in the shank and have bevelled terminals 19 at the ends of the hook portion 20 to cause the resilient members to retract as they are pushed into the hole where the hook portions underlie the lower face of the top plate and prevent removal of the key.
A plate 22 of resilient sheet metal has four fingers 24 forming electrical contacts. The plate is secured to the lower face of key shank 14 by means of a pin 26 having a knurled section 28 which is secured within an axial opening 29 in a bushing 30. The pin extends through the top of the bushing and into an axial bore 31 in the key shank 14. An enlarged tapered head 32 is received in force fit relation near the upper end of the bore 31, thus securing the key rigidly at the upper end of the pin with the contact plate 22 interposed therebetween. The contact fingers 24 are bent downwardly at their ends to a generally C-shaped configuration shown at 25. In order to prevent rotation of plate 22 relative to the key and bushing, pins 27 (FIG. 4) carried by the key pass through the plate.
The lower end of the bushing 30 has a counterbore 29, the pin 26 and the bushing forming a plunger assembly which with the key is returned upwardly by a coiled compression spring 36 engaging a shoulder 37 at the upper end of the counterbore. At its lower end, the spring engages a circuit board 38 mounted in spaced relation to the top plate 10 by means of machine screws 40 and spacer bushings 41. This board has a conductive surface 39 engaged by the spring 36 so that in addition to providing resilient means for returning the key, the spring provides an electrical connection with the conductive surface which is a common ground. The board also has an opening 42 to receive the lower end of the pin 26.
A printed circuit board 44 is mounted in spaced relation between the top plate 10 and board 38 by means of the screws 40 and bushings 41 and the printed circuit board has an opening 46 to receive the bushing conductive free sliding relation. The top plate is mounted in secured relation in a continuous sidewall 48 of a housing with a lower wall 50. The sidewall has an opening 51 for a side extension 52 of the printed circuit board 44.
The board is copper clad on its upper face which is suitably etched to form a desired pattern of contacts 53 to be engaged by the spring fingers 24 when a key is depressed and conductive paths 54 established. The conductive paths terminate in the conductive strips 55 to which wires may be attached. The side extension 52 may also be used as an electrical plug and inserted into an appropriate socket (not shown) containing matching connecting strips.
The code is contained in the arrangement of conductive segments 53 grouped about the hole 46 on the circuit board. There are four contact ends 25 which are lowered each time the key 11 is depressed and these ends connect the segments 53 to the common conductor 39. A suitable source of potential and a series of utilization loads connected between the strips 55 and the potential source provide the desired coded transfer.
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A manually operated code switch for converting digital information into a desired pulse code comprising:
a housing;
a plurality of keys on one face of the housing, each having a digital designation;
a conductive shaft secured to each key and extending into the housing;
at least one conductive spring contact secured to each key, said contacts on each key connecting to its adjoining shaft;
a flat conductive board mounted within said housing and parallel to the face thereof;
a conductive resilient means coupled between each spring contact and said conductive board for connecting all of the spring contacts to a common terminal and for retuming all the keys to their unactuated position after being manually depressed;
an insulator circuit board positioned under all the keys and having conductors secured to one face for electrical connection to said spring contacts; and
a plurality of conductive segments on the circuit board arranged in a coded pattern around each shaft, each of said segments connected to a conductive strip on the board which is available for use by a utilization circuit.
2. A code switch as claimed in claim 1 wherein said insulator circuit board and said flat conductive board are partly constructed of synthetic plastic such as phenol formaldehyde.
3. A code switch as claimed in claim 1 wherein there are at least 10 keys and each is provided with a helical conductive spring surrounding the shaft for connecting the spring contacts with the flat conductive board.
' 4. A code switch as claimed in claim 1 wherein all the spring contacts are respectively secured to the bottom of each key by conductive bushings, said bushings each forming a contact terminal for one end of said'conductive springs.

Claims (4)

1. A manually operated code switch for converting digital information into a desired pulse code comprising: a housing; a plurality of keys on one face of the housing, each having a digital designation; a conductive shaft secured tO each key and extending into the housing; at least one conductive spring contact secured to each key, said contacts on each key connecting to its adjoining shaft; a flat conductive board mounted within said housing and parallel to the face thereof; a conductive resilient means coupled between each spring contact and said conductive board for connecting all of the spring contacts to a common terminal and for returning all the keys to their unactuated position after being manually depressed; an insulator circuit board positioned under all the keys and having conductors secured to one face for electrical connection to said spring contacts; and a plurality of conductive segments on the circuit board arranged in a coded pattern around each shaft, each of said segments connected to a conductive strip on the board which is available for use by a utilization circuit.
2. A code switch as claimed in claim 1 wherein said insulator circuit board and said flat conductive board are partly constructed of synthetic plastic such as phenol formaldehyde.
3. A code switch as claimed in claim 1 wherein there are at least 10 keys and each is provided with a helical conductive spring surrounding the shaft for connecting the spring contacts with the flat conductive board.
4. A code switch as claimed in claim 1 wherein all the spring contacts are respectively secured to the bottom of each key by conductive bushings, said bushings each forming a contact terminal for one end of said conductive springs.
US77900A 1970-10-05 1970-10-05 Electromechanical keyboard independently operated switch mechanism with improved conductive resilient actuating means Expired - Lifetime US3641286A (en)

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3721778A (en) * 1971-06-21 1973-03-20 Chomerics Inc Keyboard switch assembly with improved operator and contact structure
US3749859A (en) * 1972-04-19 1973-07-31 Colorado Instr Inc Keyboard switch assembly with improved hermetically sealed diaphragm contact structure
US3761944A (en) * 1971-01-22 1973-09-25 Alps Electric Co Ltd Binary code generator
US3784765A (en) * 1972-09-20 1974-01-08 Scope Inc Manually adjustable multiposition switch
US3790729A (en) * 1970-11-27 1974-02-05 G Bradshaw Electric switch assemblies with spring biased rotatable knob actuator for gear shift lever or the like
US3808389A (en) * 1973-01-26 1974-04-30 Three Dimensional Circuits Inc Key for electric contact keyboard
US3809838A (en) * 1971-11-01 1974-05-07 Bunker Ramo Modular push button switch assembly mounted on printed circuit board
US3826884A (en) * 1973-06-25 1974-07-30 Oak Industries Inc Keyboard switch
US3858020A (en) * 1973-07-30 1974-12-31 Staco Switch Inc Pushbutton with spring contactor
JPS509772U (en) * 1973-05-23 1975-01-31
JPS509773U (en) * 1973-05-23 1975-01-31
US3941964A (en) * 1974-12-09 1976-03-02 Bowmar Instrument Corporation Push-button type binary switch device
JPS5155964U (en) * 1974-10-25 1976-04-30
FR2308185A1 (en) * 1975-04-16 1976-11-12 Northern Telecom Ltd MULTI-CONTACT PUSH-BUTTON SWITCH
US4061888A (en) * 1976-08-12 1977-12-06 Crest Industries, Inc. Control unit mounting and interconnecting apparatus for telephone sets
US4124785A (en) * 1976-02-23 1978-11-07 Bell Telephone Laboratories, Incorporated Telephone set
DE2826262A1 (en) * 1977-06-22 1979-01-04 Serras Paulet Edouard KEYBOARD WITH PUSH BUTTONS FOR ALPHANUMERIC CONTROL OF AN ELECTRIC OR ELECTRONIC MACHINE
US4203013A (en) * 1976-10-26 1980-05-13 Serras Paulet Edouard Alphanumeric control keyboard with depressible keys for electric or electronic machines
FR2464549A1 (en) * 1979-08-31 1981-03-06 Tuloup Pierre Switching keyboard for e.g. telephone set - requires no soldering during assembly and has part-spherical electrodes in three part block
US4314112A (en) * 1971-08-23 1982-02-02 Hewlett-Packard Company Keyboard having switches with tactile feedback
US4320481A (en) * 1979-01-17 1982-03-16 Vdo Adolf Schindling Ag Setting device for analog-display motor vehicle clocks
US4439655A (en) * 1981-11-06 1984-03-27 Inventio Ag Push button for electrical switch
US4463237A (en) * 1983-04-13 1984-07-31 Wico Corporation Pushbutton assembly with integral bias means
DE3318622A1 (en) * 1983-05-21 1984-11-22 Karl A. 5900 Siegen Weidt Electronic calculator
US4631378A (en) * 1983-10-31 1986-12-23 Jelco. Co., Ltd. Push button switch
US5729222A (en) * 1993-05-21 1998-03-17 Jerry Iggulden User-configurable control device
US5744766A (en) * 1996-07-24 1998-04-28 Allen-Bradley Company, Inc. Slide or reciprocating switch with s-shaped bridging-or spanner contact
US6497521B1 (en) * 1999-12-17 2002-12-24 Daniel James Lohr No-impact keyboard

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005055A (en) * 1957-10-08 1961-10-17 Bell Telephone Labor Inc Tilting dial circuit selector
US3035211A (en) * 1958-10-21 1962-05-15 Bell Telephone Labor Inc Subscriber calling apparatus
US3080457A (en) * 1958-11-03 1963-03-05 Ericsson Telefon Ab L M Multiple switching device for automatic telephone systems
US3190975A (en) * 1960-11-03 1965-06-22 Aircraft Radio Corp Multiple key switchboard
US3210484A (en) * 1962-04-20 1965-10-05 Automatic Elect Lab Push button device
US3214527A (en) * 1962-08-03 1965-10-26 Thomas M Dauphinee Multiple electric switch for use with precision measuring instruments
US3399287A (en) * 1964-06-03 1968-08-27 Gen Electric Rockable plate type actuator for a plurality of contacts
US3506795A (en) * 1967-10-24 1970-04-14 Raymond F Schmidt Electrical switch device
US3536877A (en) * 1968-03-14 1970-10-27 Gen Electric Wafer construction for a switch tuner

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005055A (en) * 1957-10-08 1961-10-17 Bell Telephone Labor Inc Tilting dial circuit selector
US3035211A (en) * 1958-10-21 1962-05-15 Bell Telephone Labor Inc Subscriber calling apparatus
US3080457A (en) * 1958-11-03 1963-03-05 Ericsson Telefon Ab L M Multiple switching device for automatic telephone systems
US3190975A (en) * 1960-11-03 1965-06-22 Aircraft Radio Corp Multiple key switchboard
US3210484A (en) * 1962-04-20 1965-10-05 Automatic Elect Lab Push button device
US3214527A (en) * 1962-08-03 1965-10-26 Thomas M Dauphinee Multiple electric switch for use with precision measuring instruments
US3399287A (en) * 1964-06-03 1968-08-27 Gen Electric Rockable plate type actuator for a plurality of contacts
US3506795A (en) * 1967-10-24 1970-04-14 Raymond F Schmidt Electrical switch device
US3536877A (en) * 1968-03-14 1970-10-27 Gen Electric Wafer construction for a switch tuner

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790729A (en) * 1970-11-27 1974-02-05 G Bradshaw Electric switch assemblies with spring biased rotatable knob actuator for gear shift lever or the like
US3761944A (en) * 1971-01-22 1973-09-25 Alps Electric Co Ltd Binary code generator
US3721778A (en) * 1971-06-21 1973-03-20 Chomerics Inc Keyboard switch assembly with improved operator and contact structure
US4314112A (en) * 1971-08-23 1982-02-02 Hewlett-Packard Company Keyboard having switches with tactile feedback
US3809838A (en) * 1971-11-01 1974-05-07 Bunker Ramo Modular push button switch assembly mounted on printed circuit board
US3749859A (en) * 1972-04-19 1973-07-31 Colorado Instr Inc Keyboard switch assembly with improved hermetically sealed diaphragm contact structure
US3784765A (en) * 1972-09-20 1974-01-08 Scope Inc Manually adjustable multiposition switch
US3808389A (en) * 1973-01-26 1974-04-30 Three Dimensional Circuits Inc Key for electric contact keyboard
JPS5417806Y2 (en) * 1973-05-23 1979-07-07
JPS509772U (en) * 1973-05-23 1975-01-31
JPS509773U (en) * 1973-05-23 1975-01-31
JPS5444207Y2 (en) * 1973-05-23 1979-12-19
US3826884A (en) * 1973-06-25 1974-07-30 Oak Industries Inc Keyboard switch
US3858020A (en) * 1973-07-30 1974-12-31 Staco Switch Inc Pushbutton with spring contactor
JPS5155964U (en) * 1974-10-25 1976-04-30
US3941964A (en) * 1974-12-09 1976-03-02 Bowmar Instrument Corporation Push-button type binary switch device
FR2308185A1 (en) * 1975-04-16 1976-11-12 Northern Telecom Ltd MULTI-CONTACT PUSH-BUTTON SWITCH
US4124785A (en) * 1976-02-23 1978-11-07 Bell Telephone Laboratories, Incorporated Telephone set
US4061888A (en) * 1976-08-12 1977-12-06 Crest Industries, Inc. Control unit mounting and interconnecting apparatus for telephone sets
US4203013A (en) * 1976-10-26 1980-05-13 Serras Paulet Edouard Alphanumeric control keyboard with depressible keys for electric or electronic machines
DE2826262A1 (en) * 1977-06-22 1979-01-04 Serras Paulet Edouard KEYBOARD WITH PUSH BUTTONS FOR ALPHANUMERIC CONTROL OF AN ELECTRIC OR ELECTRONIC MACHINE
US4320481A (en) * 1979-01-17 1982-03-16 Vdo Adolf Schindling Ag Setting device for analog-display motor vehicle clocks
FR2464549A1 (en) * 1979-08-31 1981-03-06 Tuloup Pierre Switching keyboard for e.g. telephone set - requires no soldering during assembly and has part-spherical electrodes in three part block
US4439655A (en) * 1981-11-06 1984-03-27 Inventio Ag Push button for electrical switch
US4463237A (en) * 1983-04-13 1984-07-31 Wico Corporation Pushbutton assembly with integral bias means
DE3318622A1 (en) * 1983-05-21 1984-11-22 Karl A. 5900 Siegen Weidt Electronic calculator
US4631378A (en) * 1983-10-31 1986-12-23 Jelco. Co., Ltd. Push button switch
US5729222A (en) * 1993-05-21 1998-03-17 Jerry Iggulden User-configurable control device
US5744766A (en) * 1996-07-24 1998-04-28 Allen-Bradley Company, Inc. Slide or reciprocating switch with s-shaped bridging-or spanner contact
US6497521B1 (en) * 1999-12-17 2002-12-24 Daniel James Lohr No-impact keyboard

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