Supports – Brackets – Adjustable
Reexamination Certificate
1998-11-10
2001-01-23
King, Anita M. (Department: 3632)
Supports
Brackets
Adjustable
C248S918000
Reexamination Certificate
active
06176456
ABSTRACT:
BACKGROUND OF THE INVENTION
It is well known to provide a support mechanism including a four bar or parrallelogram linkage to support an art device, such as a keyboard, for vertically swinging movement relative to a base, such as a wall, desk top or table top, between lower and upper use positions; and a locking device to releasably retain the art device in a desired position. Typically, the linkage includes upper and lower links, a first end link for mounting a keyboard support, a second end link fixed to the base and pivot connections for pivotally connecting the ends of the links for pivotal movement about four parallel pivot axes; and the locking device includes a pair of cooperating members carried by the links.
In a commonly assigned patent application entitled KEYBOARD MOUNTING MECHANISM and filed Nov. 5, 1998, there is disclosed an improved mechanism, wherein a parallelogram linkage is pivotally mounting by one of its pivot connections on a separate base mounting member, and a locking device includes members carried by the linkage and mounting member.
SUMMARY OF THE INVENTION
The present convention is directed to an improved keyboard support mechanism in which a three-bar linkage is employed in place of a conventional four-bar linkage for mounting a keyboard support for vertical swinging movement relative to a base in combination with a locking mechanism releasable for permitting vertical movement of the keyboard support upon the application of a lifting force thereto.
REFERENCES:
patent: 142263 (1873-08-01), Morrison
patent: 274223 (1883-03-01), Redman
patent: 714694 (1902-12-01), Holtz
patent: 1176272 (1916-03-01), Bultman
patent: 3436046 (1969-04-01), Valeska
patent: 4616798 (1986-10-01), Smeenge et al.
patent: 4691888 (1987-09-01), Cotterill
patent: 5211367 (1993-05-01), Musculus
patent: 5292097 (1994-03-01), Russell
patent: 5398622 (1995-03-01), Lubinskas et al.
patent: 120853 (1946-01-01), None
King Anita M.
Simpson, Simpson & Synder, L.L.P.
Weber Knapp Company
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