Chairs and seats – Movable bottom – Tiltable
Reexamination Certificate
1999-03-29
2001-05-29
Nelson, Jr., Milton (Department: 3636)
Chairs and seats
Movable bottom
Tiltable
C297S354120
Reexamination Certificate
active
06238001
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to chairs, which can be adjusted to assume a variety of positions for rest, for writing at a desk, and so forth.
BACKGROUND OF THE INVENTION
A very large number of chair structures are known in the art, which are adjustable to permit the body of the user to assume a variety of positions, such as a reclining position for rest, a sitting position for writing at a desk and so forth. Many of said structures comprise a number of articulated parts, which swing relative to one another as the chair is adjusted from one position to another. Some of those chairs comprise a base, often in the form of a pedestal having a central column and a plurality of legs, to which the main structure of the chair is connected, by means of pivots, universal joints or the like. In some cases elastic elements are provided in the structure, whereby the chair may oscillate about a mean position, for the user's greater comfort. The last mentioned structures, however, generally do not permit the user to assume a reclining position and are capable of only limited angular displacement. In any case, structures that are widely adjustable and satisfactory from the viewpoint of the positions which they may assume, are complicated and relatively expensive to build.
It is a purpose of this invention to provide a chair which can be adjusted to assume practically any position that the user may desire, and yet is extremely simple in structure and economical to build.
It is another purpose of this invention to provide such a chair in which the user can assume either a substantially completely reclining position, or a sitting rest position, or a position adapted for writing at a desk.
It is a further purpose of the invention to provide such a chair, the structure of which comprises a minimal number of joints and particularly of pivots.
It is a still further purpose of the invention to provide such a chair which has a plurality of equilibrium positions coordinated to the position of the body of the user.
It is a still further purpose of the invention to provide such a chair which provides maximum comfort with the utmost structural simplicity.
Other purposes of the invention will become apparent as the description proceeds.
SUMMARY OF THE INVENTION
The aforesaid purposes are attained by a chair according to the invention, which comprises a base, an adjustable frame supported by said base, a seat and a back, and is characterized in that the adjustable frame is swingable with respect to the base, preferably about at least a substantially horizontal axis, and comprises telescopic arms, in that the seat and the back are swingably connected to one another, and in that the seat and the back are connected to said telescopic arms, whereby adjustment of these latter permits to vary the inclination of the seat and back. Preferably, the inclination of said seat and back vary in such a way that the center of gravity of the user's body is located at or near the line of application of the resultant of the reactions of the floor on the seat base.
In preferred forms of the invention, the adjustable frame comprises a preferably fork-shaped support, which is swingably supported by the base or by a joint coupled to the base. Preferably, also, the telescopic arms each comprise a preferably tubular casing connected to said support and front and back sliders housed in said casing and slidable therein to vary the length of the arm. Also preferably, the seat and back comprise a frame having a rigid seat portion and a rigid back portion connected in adjustable angular positioned relationship, preferably by means of pliable joint elements. Preferably the seat is connected to the telescopic arms casings, in the vicinity of their front ends, and the back is swingably connected to the back sliders, whereby variations of the length of the telescopic arms produces relative swinging motions of the seat and back. Preferably the chair according to the invention also comprises a head rest connected to the back, preferably in adjustable angular positioned relationship, e.g. through pliable joint elements. Also preferably, means are provided for angularly blocking the support relative to the base. The telescopic arms may serve as arm rests or support such rests.
Other features of the invention will appear as the description proceeds.
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patent: 513584 (1894-01-01), Leisenring
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patent: 3142512 (1964-07-01), Hamilton et al.
patent: 3565482 (1971-02-01), Blodee
patent: 3870365 (1975-03-01), Knutsen
patent: 3877750 (1975-04-01), Scholpp
patent: 4164356 (1979-08-01), Knight
patent: 4514009 (1985-04-01), Vanderminden et al.
patent: 5611594 (1997-03-01), Findlay
patent: 0 677 260 A1 (1995-02-01), None
patent: 111987 (1917-12-01), None
patent: 1403648 (1975-08-01), None
Foley Hoag & Eliot LLP
Jr. Milton Nelson
LandOfFree
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