Adjustable keyboard holder
First Claim
1. An adjustable keyboard holder comprising in combination:
- (a) a pair of spaced, parallel, stationary, elongated rail members including upper and lower support surfaces;
(b) a pair of elongated, spaced, parallel beam means having interconnected roller means for associating each one of said beam means with said support surfaces of a different one of said rail members for extension and retraction movements of each said beam means along and relative to each said associated rail member;
(c) keyboard support means having opposite end portions;
(d) two pairs of lever arm members,the lever arm members of each pair being in laterally spaced, parallel relationship to each other and located adjacent a different one of said keyboard support opposite end portions,the respective lever arm members of one said pair being in transversely spaced, parallel relationship to the corresponding respective lever arm members of the second said pair,a corresponding one end region of each lever arm member of each said pair of lever arm members being pivotably associated with a different one of said beam means, including pivot shaft means therefor, anda corresponding opposite end region of each said lever arm member of each said pair of lever arm members being pivotably associated with a different one of said keyboard support opposite end portions, including pivot shaft means therefor, thereby to provide a forward pair of lever arm members and a rearward pair of lever arm members relative to said keyboard support means; and
(e) said rearward pair of lever arm members additionally being slidably horizontally movable along each respective so associated said beam means;
whereby said keyboard support means is horizontally extensible and retractable, and, when extended, said keyboard support means is height adjustable and tilt angle adjustable.
1 Assignment
0 Petitions
Accused Products
Abstract
An adjustable keyboard holder has a keyboard support. Relative to a horizontal work platform, the keyboard support is slidably extensible from a storage position to a working position and is retractable therefrom. In the working position, the keyboard support is vertically adjustable and tilt angle adjustable. The keyboard support is pivotably supported on each end by two pairs of lever arms and these lever arms are all pivotably supported by a pair of slidable beams so that a parallelogram arrangement is achieved which is used for keyboard support vertical positioning. One pair of lever arms is slidably movable relative to the associated respective beams so that, by varying the distance between lever arm pivot locations along each beam, tilt positioning is accomplished. Adjustable friction enhancers permit position fixing of the lever arms when the keyboard support is in a desired attitude. The keyboard support can be a keyboard tray or a combination of a keyboard with interconnection means for lever arm association.
107 Citations
15 Claims
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1. An adjustable keyboard holder comprising in combination:
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(a) a pair of spaced, parallel, stationary, elongated rail members including upper and lower support surfaces; (b) a pair of elongated, spaced, parallel beam means having interconnected roller means for associating each one of said beam means with said support surfaces of a different one of said rail members for extension and retraction movements of each said beam means along and relative to each said associated rail member; (c) keyboard support means having opposite end portions; (d) two pairs of lever arm members, the lever arm members of each pair being in laterally spaced, parallel relationship to each other and located adjacent a different one of said keyboard support opposite end portions, the respective lever arm members of one said pair being in transversely spaced, parallel relationship to the corresponding respective lever arm members of the second said pair, a corresponding one end region of each lever arm member of each said pair of lever arm members being pivotably associated with a different one of said beam means, including pivot shaft means therefor, and a corresponding opposite end region of each said lever arm member of each said pair of lever arm members being pivotably associated with a different one of said keyboard support opposite end portions, including pivot shaft means therefor, thereby to provide a forward pair of lever arm members and a rearward pair of lever arm members relative to said keyboard support means; and (e) said rearward pair of lever arm members additionally being slidably horizontally movable along each respective so associated said beam means;
whereby said keyboard support means is horizontally extensible and retractable, and, when extended, said keyboard support means is height adjustable and tilt angle adjustable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An adjustable keyboard holder comprising in combination:
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(a) a pair of spaced, parallel, stationary, elongated rail members including upper and lower support surfaces; (b) a pair of elongated, spaced, parallel beam means having interconnected roller means for associating each one of said beam means with said support surfaces of a different one of said rail members for slidable extension and retraction movements of each said beam means along and relative to each said associated rail member; (c) a keyboard means having opposite end portions and associated interconnection means at said opposite end portions; (d) two pairs of lever arm members, the lever arm members of each pair being in laterally spaced, parallel relationship to each other and located adjacent a different one of said keyboard support opposite end portions, the respective lever arm members of one said pair being in transversely spaced, parallel relationship to the corresponding respective lever arm members of the second said pair, a corresponding one end region of each lever arm member of each said pair of lever arm members being pivotably associated with a different one of said beam means, including pivot shaft means therefor, and a corresponding opposite end region of each said lever arm member of each said pair of lever arm members being pivotably associated with a different one of said keyboard interconnection means, including pivot shaft means therefor, thereby to provide a forward pair of lever arm members and a rearward pair of lever arm members relative to said keyboard support means; (e) said rearward pair of lever arm members additionally being slidably horizontally movable along each respective so associated said beam means; and (f) adjustable friction enhancer means functionally associated between said end region of each said lever arm member and said respective so associated said beam means for restricting movement of each of said lever arm members and including adjustment means therefor;
whereby said keyboard support means is horizontally extensible and retractable, and, when extended, said keyboard support means is height adjustable and tilt angle adjustable. - View Dependent Claims (12, 13, 14, 15)
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Specification