Chairs and seats – Bottom or back with means to alter contour
Patent
1992-01-17
1995-03-14
Chen, Jose V.
Chairs and seats
Bottom or back with means to alter contour
2972844, A47C 300
Patent
active
053971647
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arching mechanism, particularly for a backrest for a vehicle seat or seats for office and home furniture, respectively seats of all kind, as well as for use particularly in medical or orthopaedic devices and apparatus, such as corsets or arch supports, in scaffoldings or casings, for the production of hulls, etc.
When for instance the arching of a backrest is adjusted, usually the apex of its convexity wanders according to the construction type of the arching mechanism over the height of the backrest, always remaining the same. It does not adjust sufficiently to the constantly changing curvature of a more or less curved spinal column, or to a stretching of the spinal column which is medically recommended or desired by the user. In constructions with shell seats, usually the lateral support diminishes with increased arching.
BACKGROUND OF THE INVENTION
The EU-B-37656 shows a restraining frame for a motor vehicle seat, wherein a support piece is suspended by springs. The support piece consists of two lateral parts connected to the frame by springs and mutually connected by cross elements. There is a centrally located adjusting shaft which can be actuated by a hand wheel, the shaft running through so-called engagement devices, which in turn are connected to the outermost points of the lateral parts via flexible connection elements. When the hand wheel is turned, an arching of the support part is supposed to result, whereby basically in the beginning only an expansion of the springs occurs. This type of construction affords support to only a few vertebrae; the vertebrae lying above and below do not get the same strong support. A freely suspended insertion of the support part in the backrest or a construction wherein the support is suspended in the upholstery is not possible.
The DE-OS 2804703 shows a backrest wherein a plate having straps arranged oppositely to each other can be arched via mutually engaged guide rails. The entire plate is height-adjustable by means of a rocker lever.
The EU-A1-322535 shows a backrest with an upper and a lower support strap which are interconnected by a vertical, flexible strap and a spring tensioned between them, whereby an adjusting shaft engages via a gear in the lower support strap, in order to achieve an arching of the backrest by bending the flexible strap.
Further, backrests made of foam material are known, which are supposed to adjust to the shape of the spinal column.
Another example is shown by DE-OS 3440846 which discloses an automobile seat whose backrest comprises a frame and a plate received in the frame. The plate is provided with vertically extending longitudinal slits in which a lumbar-support device is movable. The lumbar support can be adjusted by a hand wheel through a shaft linked onto the frame to vary its stiffness and to move it vertically.
The lumbar support is directly connected with the frame. As a result, all vibrations imparted by the road to the vehicle are fully transmitted to the back of the driver.
The known mechanisms do not permit any accommodation to changed or changing curvatures of the spinal column. For instance, during long car trips, the curvature of the spinal column alters greatly as a result of the required holding work, when the total weight of the upper body must be supported based on this disadvantageous position (hand stretched out towards the steering wheel). This muscle work, respectively holding work in order to keep the body upright under conditions of improper or insufficient support has to be performed entirely by the musculature and the skeletal system, and thus logically leads to considerable exhaustion, as well as muscle stress. The involved muscles require for this work up to 40 times more blood, respectively 40 times more energy, compared to an anatomically supported upper body (whose muscles do not have to perform any holding work).
The support, respectively holding work must be performed by the arching mechanism and namely for all spinal columns (whose curvatures
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patent: 4627661 (1986-12-01), Ronnhult et al.
patent: 4880271 (1989-11-01), Graves
patent: 4909568 (1990-03-01), Dal Monte
patent: 5050930 (1991-09-01), Schuster et al.
patent: 5217278 (1993-06-01), Harris et al.
Chen José V.
Dubno Herbert
Schuster Wilhelm
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