Keyboard mounting mechanism

Details Keyboard mounting mechanism Keyboard mounting mechanism

1998-11-16

2001-07-10

Braun, Leslie A. (Department: 3632)

Supports

Brackets

Adjustable

C248S291100

Reexamination Certificate

active

06257538

ABSTRACT:

This application claims the benefit of PCT International Application Ser. No. PCT/US98/23246, filed Nov. 13, 1998.
BACKGROUND OF THE INVENTION
It is known to support a surface, such as may be defined by a keyboard supporting tray, for vertically swinging movement relative to a base, such as may be defined by the top of a table or work station, by a mechanism including a pair of link elements each having first and second ends thereof pivotally connected to a surface mounting element and a base mounting element, respectively. Such mechanisms typically include a counterbalance spring tending to bias the surface mounting element and link elements upwardly relative to the base, and a manually operable locking mechanism serving to releasably retain the surface mounting element in a desired vertical position.
It has also been proposed to provide an additional bracket serving to interconnect the surface mounting element to the link elements in a manner allowing downwardly directed tilting movement of the surface mounting element in combination with an additional manually operable locking mechanism serving to releasably retain the surface mounting element in a desired tilted position.
Known clamping mechanisms are disclosed for example by U.S. Pat. Nos. 4,616,798; 4,644,875; 4,691,888; 5,037,054 and 5,791,263.
SUMMARY OF THE INVENTION
The present invention relates to improvements in mechanisms for mounting a keyboard supporting surface for both vertical swinging movement relative to a base and for vertical tilting movements under the control of a single or common locking mechanism, wherein a spring bias is provided for opposing both vertically downwardly directed swinging and tilting movements of the keyboard supporting surface.
In the preferred construction of the present mechanism, separate counterbalance and return or tilt control springs are provided in order to permit individually controlled swinging and tilting movements of the keyboard supporting surface.


REFERENCES:
patent: 4616798 (1986-10-01), Smeenge et al.
patent: 4644875 (1987-02-01), Watt
patent: 4691888 (1987-09-01), Cotterill
patent: 5037054 (1991-08-01), McConnell
patent: 5513579 (1996-05-01), Allan
patent: 5791263 (1998-08-01), Watt et al.
patent: 5836560 (1998-11-01), Kaplan et al.
patent: 5839373 (1998-11-01), Lin
patent: 5924664 (1999-07-01), Mileos et al.

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