Typewriting machines – Key-board or key lever-actuating mechanism – Key-board having multiple-character – multiple-movement keys
Patent
1984-06-25
1988-10-18
Crowder, Clifford D.
Typewriting machines
Key-board or key lever-actuating mechanism
Key-board having multiple-character, multiple-movement keys
400489, 400490, 200339, B41J 528, B41J 510, B41J 512
Patent
active
047782951
ABSTRACT:
A keyboard having ten elongate keys extending in a row substantially at right angles to a transverse centerline through the keys with each of the keys having a longitudinal trough on its upper surface defined by three recesses extending longitudinally of the key, with the sides of the recesses of adjacent edges of the fourth and fifth keys and of the sixth and seventh keys being reduced in height so as to facilitate movement of the index fingers from the fourth to the fifth key and from the seventh to the sixth key. Each of the elongate keys actuates three switches depending into which of the three recesses of the key a finger is applied, and the elongate key of one form of the invention is formed by a central relatively short auxiliary key and a long auxiliary key on its opposite ends, with these being articulated. Switch mechanism actuated by the key includes three plates in face-to-face contact. The short auxiliary key is fixed on a third one of the plates which is constrained to be strictly reciprocative, and the long auxiliary key is fixeid on the second of the plates which is reciprocative and is also swingable and is disposed between the first and third plates. The first plate is fixed and constitutes a supporting plate. The second plate carries a switch actuating pin which actuates various different switches depending on the swing given this second plate. A second embodiment of the switch mechanism includes the fixed first plate and also includes second and third plates. In this case, the third plate is between the first and second plates and is strictly reciprocative, and the second plate is reciprocative and also is swingable. The second plate carries a switch actuating pin. The elongate key in this case is integral end-to-end and has the second plate fixed to it. The third plate has a pair of spaced rounded supporting edges on which the elongate key may swing.
REFERENCES:
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patent: 2408452 (1946-10-01), Stixrud
patent: 2449126 (1948-09-01), Kirkpatrick
patent: 3667787 (1972-06-01), Semour
patent: 3929216 (1975-12-01), Einbinder
patent: 4029915 (1977-06-01), Ojima
patent: 4449839 (1984-05-01), Bleuer
Montgomery, "Bringing Manual Input into the 20th Century", Computer magazine; pp. 11-18; Mar. 1982.
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