Horizontally supported planar surfaces – Tiltable surfaces – Pivotally adjustable about horizontal axis
Patent
1981-04-14
1983-12-20
Zugel, Francis K.
Horizontally supported planar surfaces
Tiltable surfaces
Pivotally adjustable about horizontal axis
248454, 248456, A47F 512
Patent
active
044210353
ABSTRACT:
A keyboard is pivotally mounted on a pull out shelf to be raised from a reference position to desired angles of inclination within a range of angles, and is associated with apparatus for positively locking the keyboard following movement of the keyboard to a desired angle of inclination and its release; with the weight of the keyboard acting to maintain locking action. The apparatus effecting the locking action comprises a toothed segment whose arc and teeth define a range of angles. Associated with the toothed segment is a supporting arm biased to follow upward keyboard movement and on which the keyboard after being raised to a desired angle of inclination rests. Cooperating with the toothed segment is a pawl arranged to be deflected by the tooth segment as it follows the keyboard movement to a desired angle of inclination and upon release of the keyboard to engage with a tooth on the toothed segment to positively lock it under the weight of the keyboard thereby to establish the angle of inclination of the keyboard. To establish a lower angle of inclination from a higher angle of inclination, the keyboard and toothed segment are raised beyond the influence of the pawl and then lowered, with the pawl being cammed away by the lowering toothed segment.
REFERENCES:
patent: 186487 (1877-01-01), Miltz
patent: 663582 (1900-12-01), Robbin
patent: 773720 (1904-11-01), Drury
patent: 1836053 (1931-12-01), Wagner
patent: 1896965 (1933-02-01), Madden
patent: 3698764 (1972-10-01), Geddings
patent: 4350098 (1982-09-01), Shirouo et al.
Gubbe Bernd
Krause Klaus-Dieter
Neidhardt Rudolf
Schonemann Otto
Spalla Joseph R.
Triumph-Adler A.G. fur Buro-und Informationstechnik
Zugel Francis K.
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