Chairs and seats – Supplemental back – Including a means to adjust supplemental back relative to a...
Patent
1993-06-21
1995-04-04
Cranmer, Laurie K.
Chairs and seats
Supplemental back
Including a means to adjust supplemental back relative to a...
29723011, A47C 702
Patent
active
054030676
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a back support for a chair or seat.
There has been a need to convert existing seating arrangements which either do not provide proper back support or which do not provide a simple means of adjusting the back of the chair so that it does provide proper support. These needs are of particular concern to people who have existing back problems such as lower back pain, arthritis, post laminectomy/spinal fusion, a disc condition or sciatica.
According to a first aspect of the present invention there is provided a back support for supporting the back of a seated person, comprising a concave shell having sides extending forwardly of the shell and strap means extending between the sides to define a back support surface, the strap means being of adjustable length between the sides, the arrangement being such that tension applied to the strap means causes the shell to deform.
According to a second aspect of the present invention there is provided a back support for supporting the back of a seated person, comprising a semi-rigid shell having a central concave portion intermediate sides of the shell, the sides extending forwardly of the central portion, and strap means extending between the sides to define a back support surface, the strap means being of adjustable length such that it serves to define the position of the back support surface relative to the shell such that in use, when the back of a person leans against the support the resultant tension applied to the strap means causes the sides of the shell to move closer together whereby the back support surface conforms to the specific shape of the person's back thereby providing back and lateral support.
Preferably, the strap means comprises a plurality of spaced, substantially horizontal straps extending between the sides of the shell, each strap being independently adjustable in length to enable the shape of the back support surface to be selectively varied. It is also desirable that the strap means be elastic so that the back support surface provides a yielding surface.
Advantageously, the shell has apertures, which may be in the form of substantially vertical slots, proximal the outer peripheral edge of the sides for receiving the free ends of the strap means therethrough.
Conveniently, the rear of the shell has at least one transversely extending slot therethrough to provide ventilation and/or provide additional flexure to the semi-rigid shell. In a preferred form, the rear of the shell includes at least two transverse slots which are arranged to define transverse lands therebetween which may be grasped to assist in the adjusting of the strap means. Further, the or each land may carry means thereon for adjustably securing a free end portion of the strap means relative to the land.
In one preferred form, the back support may be in the form of a removable support cushion which can be placed against the back portion of an existing chair.
In another preferred form, the back support may be mounted on the seat part of a chair to thereby provide a chair back of the chair.
Embodiments of the present invention seek to provide a back support having a simple construction and one which can be easily adjusted to provide improved back support.
The invention will now be further described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of an embodiment of a back support of the present invention;
FIG. 2 is a view similar to FIG. 1, but with a protective cover and support layer removed to show the shell opening and adjustable straps;
FIG. 3 is a side elevation of the embodiment of FIG. 1 with the protective cover removed;
FIG. 4 is a sectional view on line A-A' of FIG. 3; and
FIG. 5 is rear elevation of the back support.
Referring to FIGS. 1 and 2, the back support, generally indicated by the numeral 10, comprises a semi-rigid shell 20 which is formed of a plastics material, for example high density polypropylene, ABS (acrylonitrile butadiene styrene) or the like, which may be formed by i
REFERENCES:
patent: 1975586 (1934-10-01), Law
patent: 2504190 (1950-04-01), Farrell
patent: 2551741 (1951-05-01), Hopper
patent: 2582115 (1952-01-01), Goodeve
patent: 2621714 (1952-12-01), Kiwad
patent: 2716443 (1958-08-01), Laughlin
patent: 3679261 (1972-07-01), Slabakov
patent: 4556254 (1985-12-01), Roberts
Cranmer Laurie K.
Davband Pty. Limited
LandOfFree
Back support for a chair or seat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Back support for a chair or seat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Back support for a chair or seat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2376600