Importance

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Abstract

Integrated seat, back and mechanisms are provided for tilting chairs, and other similar seating. The chair has a base, a seat, a back, a back support and a mechanism which interconnects the seat, back and back support, and imparts a predetermined synchronous movement to the seat and back, i.e. rearward tilting of the seat and simultaneous rearward tilting of the back. The chair back has rotation means for rotatably connecting the chair back to the back support. The rotation is about a rotation axis which passes through the upper body of a person when the person is sitting on the seat and resting against the front of the chair back. The bottom portion of the chair is preferably guided so that the bottom may move along an arc between a first position and a second position which is forward and lower than the first position. The mechanism also has a very large range of movement allowing the user a continuous angular variation from forward inclination to full reclined inclination. The mechanism also allows the rate at which the back inclines with respect to the seat in various segments of the inclination range to be different. The seat and back are contoured specifically to accommodate a larger population, with a higher level of comfort, i.e. to provide a pleasing pressure distribution pattern, that varies proportionately and continuously with the tilting motion of the chair, throughout the movement range provided by the mechanism. The seat, back and mechanism thus form an integral part of the chair, in as much as the contour has been worked out in connection with the movement as stated above and some parts of the mechanism may be embedded into the seat and back. When all the above parameters act in concert they impart a very high comfort level and uniformity of support in either the static or the dynamic conditions.

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