GB490000A - Improvements in key-boards of calculating machines - Google Patents

Improvements in key-boards of calculating machines

Info

Publication number
GB490000A
GB490000A GB11802/38A GB1180238A GB490000A GB 490000 A GB490000 A GB 490000A GB 11802/38 A GB11802/38 A GB 11802/38A GB 1180238 A GB1180238 A GB 1180238A GB 490000 A GB490000 A GB 490000A
Authority
GB
United Kingdom
Prior art keywords
keys
key
digits
calculating
april
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
Application number
GB11802/38A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB490000A publication Critical patent/GB490000A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06C—DIGITAL COMPUTERS IN WHICH ALL THE COMPUTATION IS EFFECTED MECHANICALLY
    • G06C9/00—Transfer mechanisms, e.g. for transmitting figures from the input mechanism into the computing mechanism

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

490,000. Calculating - apparatus ; typewriters. HOFGAARD, R. April 20, 1938, No. 11802. Convention date, April 22, 1937. [Class 106 (i)] [Also in Group XVI] A keyboard for a calculating or similar machine has an arrangement of keys in a number less than the number of digits to be represented and positioned relatively to each other so that one key or a combination of keys can be actuated, by means of one finger, to enter any one of the digits. In the form shown in Fig. 1, four keys 1 to 4 for the digits " 1 " " 8," " 2 " and " 4 " are provided. The key 1 is formed with a cross-piece 12 and the remaining digits " 3," " 5," " 6," " 7 " and " 9 " are arranged in the manner shown so that when a certain numeral is pressed upon a single key or a combination of keys will be actuated. The keys 1 and 2 are at a lower level than the keys 3 and 4, as shown in Fig. 2, but the cross-piece 12 is on a level with the keys 3 and 4. Each key is formed with a pin 5 having an extension finger 8 for co-operation with a contact, spring 9. A spring controlled locking plate 10 with oval shaped apertures co-operates with conical restrictions 11 on the pins 5 to hold the keys in depressed position.
GB11802/38A 1937-04-22 1938-04-20 Improvements in key-boards of calculating machines Expired GB490000A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO490000X 1937-04-22

Publications (1)

Publication Number Publication Date
GB490000A true GB490000A (en) 1938-08-08

Family

ID=19905789

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11802/38A Expired GB490000A (en) 1937-04-22 1938-04-20 Improvements in key-boards of calculating machines

Country Status (1)

Country Link
GB (1) GB490000A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133745A (en) * 1983-01-21 1984-08-01 Laitram Corp Increasing keyboard functions by depressing a plurality of keys simultaneously
GB2134042A (en) * 1983-01-21 1984-08-08 Laitram Corp Keyboard with extra functions obtained by pressing key combinations
US4891777A (en) * 1983-05-11 1990-01-02 The Laitram Corporation Single hand keyboard arrays providing alphanumeric capabilities from twelve keys
US4994992A (en) * 1983-04-26 1991-02-19 The Laitram Corporation Contoured touch type data processing keyboard

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133745A (en) * 1983-01-21 1984-08-01 Laitram Corp Increasing keyboard functions by depressing a plurality of keys simultaneously
GB2134042A (en) * 1983-01-21 1984-08-08 Laitram Corp Keyboard with extra functions obtained by pressing key combinations
GB2149946A (en) * 1983-01-21 1985-06-19 Laitram Corp Computer keyboard
US4994992A (en) * 1983-04-26 1991-02-19 The Laitram Corporation Contoured touch type data processing keyboard
US4891777A (en) * 1983-05-11 1990-01-02 The Laitram Corporation Single hand keyboard arrays providing alphanumeric capabilities from twelve keys

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