Patent Application
20060279126
The invention relates to chairs, and in particular, to an improved backrest for a chair.
Chairs with adjustable backrests are well known. Such prior art chairs typically allow the backrest to recline, rise and lower, and the lumbar support to be adjusted. These adjustments are typically enabled by mechanical devices. While such devices permit the backrest to be adjusted in a particular position, the backrest is then locked in the selected position, or its movement is restricted along one or more axes.
Recent research has suggested that it may be beneficial to the musculoskeletal system of a user to continually move while seated. Accordingly, there is a need for an improved chair which encourages the user to continually move, while at the same time providing continuous support by permitting the backrest to move with the user in multiple degrees of freedom.
According to a first aspect of the present invention, a chair is provided. The chair comprises: (i) a seat; (ii) a base portion connected to the bottom of the seat; (iv) an upwardly extending support frame connected to either the seat or the base; and (v) a backrest connected to the support frame by a plurality of fasteners. The fasteners include a resilient member located between the backrest and the support frame, such that the backrest is spaced apart from the support frame. The resilient members provide the advantage of permitting the backrest to move and adjust, in multiple degrees of freedom, to the movement of the user's back
Preferably, three fasteners are arranged in a triangular configuration and include elastomeric members, such as rubber grommets.
According to a second aspect of the present invention, a chair is provided. The chair comprises: (i) a seat; (ii) a base portion connected to the bottom of the seat; (iv) an upwardly extending support frame connected to either the seat or the base; and (v) a backrest connected to the support frame by three fasteners arranged in a triangular configuration. The fasteners include a resilient member located between the backrest and the support frame.
In the accompanying drawings:
The base portion 14 may include any number of conventional components, such as legs 16 and castors 18. The base portion 14 may also include conventional adjustment mechanisms (not shown) to permit the chair 10 to rotate, tilt, or move the seat vertically.
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Preferably, the fasteners 32a, 32b, and 32c are arranged in a triangular configuration. In particular, a pair of fasteners 32a, 32b are aligned horizontally. The third fastener 32c is preferably positioned below the pair of fasteners 32a, 32b and is horizontally centered between them. In one example, the horizontal distance between the pair of fasteners 32a, 32b is about 2.9 inches, and the third fastener 32c is located about 1.5 inches below the pair of fasteners 32a, 32b.
Each of the pair of fasteners 32a, 32b preferably includes a threaded rod 40 on which is mounted a resilient member, such as an elastomeric grommet 42. Preferably, the grommets 42 are composed of rubber, which has a nominal durometer of 58 on the Shore A scale. The rods 40 are mounted into corresponding holes 34a, 34b and 36a, 36b of the rear cover 27 and support frame 22, respectively, such that the grommets 42 are positioned between the support frame 22 and the rear cover 27. The threaded rods 40 are secured to the support frame 22 by nuts 48 and to cushion support 26 by nuts 33a, 33b.
The third fastener 32c includes a bolt 50 on which is mounted a third resilient member, such as a cork-shaped elastomeric grommet 52. Preferably, the grommet 52 is composed of rubber.
The grommet 52 is bounded by washers 54 on either side. The bolt 50 is secured within nut 33c of mounting plate 30, such that a narrower portion 56 of the grommet 52 is positioned between the rear cover 27 and support frame 22 and a wider portion 58 of the grommet 52 is positioned within hole 36c (which is wider than holes 36a, 36b).
A decorative cover plate 60 is connected to the rear surface of support frame 22.
During operation of the chair 10 according to the preferred embodiment, the pair of grommets 42 and the third grommet 52 in the preferred triangular configuration permit the backrest 20 to move in multiple degrees of freedom to adjust to movements of the user's back.
While the present invention as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and thus, is representative of the subject matter which is broadly contemplated by the present invention, that the scope of the present invention fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the present invention is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more.” All structural and functional equivalents to the elements of the above-described preferred embodiment that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the present claims. Moreover, it is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims.
