Chairs and seats – Bottom or back with means to alter contour – Providing support for lower back region
Patent
1995-05-01
1997-07-29
Nelson, Jr., Milton
Chairs and seats
Bottom or back with means to alter contour
Providing support for lower back region
3972841, A47C 3025
Patent
active
056515839
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a seat back rest with an adjustment device for a resilient arching element for adjusting the convex curvature of said back rest.
FIELD OF THE INVENTION
Such adjustable back rests are widely known, such as from U.S. Pat. No. 5,050,930, for example. They are all based on the principle of providing the back rest with a convex curvature adapted to the person sitting on the seat so that that person is provided with an ergonomically correct support in the area of the spinal column. Various systems are known, by which the convex curvature may be adjusted from a shallow to deep curve, however there are also systems in which the position of the peak of the curve adjusted selectively from shallow to deep may be moved upwards or downwards along the length of the seat. Back rests with adjustable convex curvature are also referred to as lumbar supports.
A common feature of these known adjustable back rests is that, in particular when the convex curvature is adjusted to be severe, a free unsupported area is left in the pelvic region and this causes the person problems after long periods in sitting position.
A seat is known from U.S. Pat. No. 4,832,400, which has a back rest with a separately pivoted hip support arranged in the lower area of the back rest. A corresponding hip support is known from U.S. Pat. No. 4,940,284 which is fully integrated into the back rest. Adjustment of the back rest is not provided for in these seats.
A seat with a back rest is known from U.S. Pat. No. 4,944,554, which has a plurality of plates arranged one above the other over the entire height of the back rest and flexibly connected to one another by means of bands, said plates being arranged to be individually adjusted, either manually or automatically, by means of adjustment devices attached to each individually, so that the back rest may be given almost any desired profile. This back rest is extremely complicated and very expensive to manufacture as well as requiring a great deal of effort for adjustment.
SUMMARY OF THE INVENTION
The object of the invention is to improve an adjustable seat back rest of the aforementioned type in such a way as to ensure that the back, in particular the pelvis, is also adequately supported directly underneath the curved area of the back rest, which, according to a further object of the invention, also has a simple structure and is therefore inexpensive to manufacture as well as being simple to adjust without requiring special effort for different users.
This object is achieved by a back rest with an adjustment device for a resilient arching element arranged on a frame for adjusting the convex curvature of said back rest, characterized in that it has an additional pelvic support connected to said resilient arching element, said pelvic support being composed of an attachment to said resilient arching element directed towards said seat.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in more detail below on the basis of examples with reference to the drawings.
FIG. 1 shows a rear view onto a back rest with an arching device and a pelvic support secured in the area above the peak of the curve;
FIG. 2 shows a lateral view of the same as FIG. 1;
FIG. 3 shows a back rest with an arching device, the arching element of which has an extension acting as a pelvic support;
FIG. 4 shows a lateral view of the same as FIG. 3;
FIG. 5 shows an arching element with integrated pelvic support made of a plastic plate.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A back rest, as shown in FIGS. 1 and 2, is provided with a frame 1 with two transverse struts 2 and a guide means 3. The guide means 3 comprises two rods 4 arranged parallel to one another. A resilient arching element 5 is arranged on the rods 4. The arching element 5 in the embodiment according to FIGS. 1 and 2 comprises two resiliently bendable strips 6 in parallel arrangement, which are connected to one another by spaced transverse strips 7. The strips 6, 7 may be made of metal or any
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Klingler Knud
Rozaitis Paul
AMEU Management Corp.
Jr. Milton Nelson
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