Horizontally supported planar surfaces – Horizontally adjustable – Concurrent horizontal and vertical movements
Patent
1987-03-02
1988-10-11
Aschenbrenner, Peter A.
Horizontally supported planar surfaces
Horizontally adjustable
Concurrent horizontal and vertical movements
248 1B, 2482811, 312208, 312325, A47B 2103
Patent
active
047762845
ABSTRACT:
A retractable work station suitable for use with a computer keyboard has a parallel swing-link suspension for selectively moving a working platform surface from a fully retracted position, to an advanced working position, while maintaining unchanged the inclination of the platform surface. The apparatus is equipped with a brake for immobilizing the linkage in any desired intermediate position. The platform is adjustably secured to a moveable frame portion of the apparatus so that the inclination of the work platform can be selectively adjusted. One embodiment incorporates tension springs to urge the platform towards either one or the other of its bi-stable positions i.e. fully retracted or fully extended. An inverted embodiment of the apparatus maintains itself in a selected one of its two bi-stable positions without the need for springs. The shape of the respective links of the suspension assures the maintenance of an adequate free space over the platform when retracted, for storage of a keyboard apparatus thereon.
REFERENCES:
patent: 876159 (1908-01-01), Erickson
patent: 883305 (1908-03-01), Fetch
patent: 1565246 (1925-12-01), Axen
patent: 2822229 (1958-02-01), Carlson
patent: 2874994 (1959-02-01), Chester
patent: 3474991 (1969-10-01), Toubhans
patent: 4625657 (1986-12-01), Little et al.
patent: 4644875 (1987-02-01), Watt
patent: 4691888 (1987-09-01), Cotterill
Aschenbrenner Peter A.
Brittain James R.
Hofbauer Patrick J.
Kosuth Inc.
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