Apparatus for locking a keyboard at selected inclinations to a horizontal reference

US4421035A · kind A · utility

Assignee

• Triumph-Adler A.G. fur Buro- und Informationstechnik · DE

Inventors

• Bernd Gubbe · Ludwigshafen am Rhein, DE
• Klaus Krause · Onex, CH
• Otto Schonemann · Fürth, DE
• Rudolf Neidhardt · Nuremberg, DE

Key dates

• Filing date: Apr 14, 1981
• Grant date: Dec 20, 1983
• Expiry date: Apr 14, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S248/918
• WIPO field: Civil engineering
• WIPO sector: Other fields

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 low…