US3828910A - Coding keyboard - Google Patents

Coding keyboard Download PDF

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Publication number
US3828910A
US3828910A US00306286A US30628672A US3828910A US 3828910 A US3828910 A US 3828910A US 00306286 A US00306286 A US 00306286A US 30628672 A US30628672 A US 30628672A US 3828910 A US3828910 A US 3828910A
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US
United States
Prior art keywords
plate
pushbutton
push
openings
printed circuit
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
US00306286A
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English (en)
Inventor
G Glay
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Application granted granted Critical
Publication of US3828910A publication Critical patent/US3828910A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs

Definitions

  • the present invention has as its object a coding keyboard and more particularly a coding keyboard for a teleprinter.
  • the depressing of a key operates a relay associated with suitable electric or electronic circuits which produce binary coded signals corresponding to a character associated with the said key.
  • the keys are removable elements set in recesses of the keyboard and fixed by suitable means.
  • the keyboard according to the invention is especially adapted to the case where the circuits and coding and commutation members are mounted on a panel in the form of printed circuits and components set on a face of the said panel.
  • This keyboard comprises a central plate called a shunt plate, a lower plate which is the printed circuit panel and an upper plate forming a cover, these three plates being parallel to one another and held in place by crosspieces.
  • the shunt plate has holes or openings in which are inserted permanently push-button guides. Push-buttons may slide in the push-button guides such that when a key is lowered a magnet fixed to the push-button controls the closing of a switch with flexible blades fixed on the upper face of the printed circuit panel.
  • FIG. 1 represent in perspective the keyboard according to the invention without the push-buttons and a push-button associated with one of the push-button guides;
  • FIG. 2 represents a plan view of a part of the shunt plate
  • FIG. 3 represents the printed circuit plate seen from the fixing side of the switches
  • FIG. 4 represents a view in plan of the keyboard according to the invention.
  • FIG. 5a represents a view of the keyboard according to the invention cut along the plane A of FIG. 4;
  • FIG. 5b represents a view of the keyboard according to the invention cut along the plane B of FIG. 4;
  • FIG. 50 represents a view in elevation of the fixing device of the plates.
  • a metal shunt plate 1 is provided with a certain number of openings 2 (FIG. 2) in which are inserted removable guide members or push-button guides 3 made of plastic material provided with inner cavities 23.
  • Each push-button guide has a projecting upper part 4 and a lower part 5 forming a foot and bounded at the bottom by a horizontal base 6 having the form of a perforated plate.
  • a push-button 7 shown in FIG. 1.
  • This push-button on which is fixed a key cap 22 (FIG. 5a) has two parts 8 and 9 in the form of plates which may slide on both sides of the projecting parts 10 and 11 of the push-button guide in the cavities 23.
  • This push-button has in addition a magnet 13 fixed to the inside of a cylindrical recess 14.
  • This keyboard also has a printed circuit plate 15 (FIG. 3) on the upper face of which are located switches 16 controlled by the magnets of the push-buttons and which, in the example selected, are
  • these relays 16 are constituted by a glass tube hermetically sealed at each end filled with a controlled atmosphere having in the sealed axis two flexible blades, one at each end, made of magnetic metal which overlap partly in the middle of the tube without touching.
  • a bearing plate 18 made of rubber is glued on to the lower part of the plate 17.
  • the three plates, 1, 15 and 17 are parallel and connected rigidly to one another at well determined intervals by crosspieces 21 (FIG.
  • this keyboard is as follows. At rest the push-buttons are held in place by the upper plate 17 and the springs 12 are slightly compressed. The magnets 13 are all in the plane of the shunt plate 1 so that all the induction lines of these magnets are shortcircuited. These magnets cannot therefore in this position excitethe relays 16.
  • the pressing in of a push-button causes the corresponding magnet to descend until the magnet comes into the immediate vicinity of the corresponding relay 16 well below the shunt plate.
  • the relay 16 is then actuated and its contacts close until the moment of release of the pressure on the said push-button which returns to its original position under the action of the spring 12, that is to say, in a position in which the magnet 13 returns to the plane of the shunt plate which permits the contacts of the relay to open.
  • FIG. 5a represents the push-button guide 3 and the push-button 7 slightly pressed in, the magnet 13 of the push-button being already slightly below the shunt plate 1. It will also be clearly seen in this Figure that the spring 12 is supported on the flat base 6 of the pushbutton guide 3.
  • the push-button guide may, for example, be of Rilsan (Trade Name) reinforced with glass fibre and the push-button of a plastic material such as l-Iostaform (Trade Name).
  • a keyboard switch assembly comprising:
  • removable pushbutton guide members each in the form of a hollow member defining two separate cavities separated by a bridging member adapted to be operatively inserted in said openings of said central plate;
  • both of said cavity portions in each of said guide members being capable of receiving one of said pushbuttons and each of said cavity portions having a bottom;
  • an upper plate cover having sets of openings in alignment with metal plate sets of openings therein holding said pushbuttons in place;
  • each pushbutton being pressed in and sliding in the cavity of the corresponding guide member so that the magnet of this pushbutton comes into the vicinity of a corresponding relay fixed on the printed circuit plate and thereby excites this relay.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
US00306286A 1971-12-30 1972-11-14 Coding keyboard Expired - Lifetime US3828910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7147578A FR2166587A5 (da) 1971-12-30 1971-12-30

Publications (1)

Publication Number Publication Date
US3828910A true US3828910A (en) 1974-08-13

Family

ID=9088398

Family Applications (1)

Application Number Title Priority Date Filing Date
US00306286A Expired - Lifetime US3828910A (en) 1971-12-30 1972-11-14 Coding keyboard

Country Status (9)

Country Link
US (1) US3828910A (da)
BR (1) BR7207850D0 (da)
DD (1) DD104754A5 (da)
DE (1) DE2253866A1 (da)
ES (1) ES408145A1 (da)
FR (1) FR2166587A5 (da)
GB (1) GB1417845A (da)
IT (1) IT970253B (da)
NL (1) NL7214969A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067431A (en) * 1976-03-12 1978-01-10 Whitaker Ranald O Combinational keyboard with movable keys and adapted for one-handed keying of numerical information
US4331945A (en) * 1980-09-23 1982-05-25 Cattani Ii Cyrus J Magnetically actuatable tamper switch assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508228A1 (fr) * 1981-06-19 1982-12-24 Thomson Csf Mat Tel Procede de fabrication d'un clavier de commande, et clavier de commande obtenu par ce procede

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067431A (en) * 1976-03-12 1978-01-10 Whitaker Ranald O Combinational keyboard with movable keys and adapted for one-handed keying of numerical information
US4331945A (en) * 1980-09-23 1982-05-25 Cattani Ii Cyrus J Magnetically actuatable tamper switch assembly

Also Published As

Publication number Publication date
NL7214969A (da) 1973-07-03
GB1417845A (en) 1975-12-17
DD104754A5 (da) 1974-03-20
DE2253866A1 (de) 1973-07-12
BR7207850D0 (pt) 1973-09-13
ES408145A1 (es) 1975-11-16
FR2166587A5 (da) 1973-08-17
IT970253B (it) 1974-04-10

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