Convex double chair with horizontal seat and inclined footrest.
The double convex chair, with its horizontal seat, equal foot heights, double convex backrest, and inclined footrest, addresses the issue of spinal pain in current chairs by promoting vertebral mobility and spinal alignment, thereby reducing pain and improving respiratory quality.
Patent Information
- Application Number
- FR2023011937
- Authority / Receiving Office
- FR · FR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-02
- Publication Date
- 2025-05-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Current chairs, despite technological advancements, continue to cause spinal pains due to prolonged seated stations, as they often feature tilted seats, uneven footrests, and concave backrests that restrict spinal mobility.
The double convex chair addresses this by featuring a horizontal seat, four feet of equal heights, a double convex backrest with varying degrees of convexity, and an inclined footrest, which together promote better spinal physiology and reduce vertebral pain.
The chair restores vertebral mobility, improves respiratory quality, and activates spinal muscles, reducing spinal pain and promoting good spinal alignment through the combination of horizontal seating and double convex design.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
Title of the invention: Double convex chair with horizontal seat and inclined plane footrest. Technical field
[0001] The invention relates to a chair which aims to remedy spinal pain due to prolonged sitting. State of the prior art
[0002] Currently the vast majority of chairs are built with: A seat tilted backward Forefeet higher than hindfeet. A backrest inclined towards the rear, often concave towards the front to support the bust.
[0003] Despite all the technological developments, despite all the new forms made possible by manufacturing developments and design progress, spinal pain, described as back pain, the disease of the century, persists and the percentage of the population affected remains high. To try to remedy this problem, the present invention proposes to modify not the materials but the shape of current art chairs by: A horizontal seat Four feet of equal height A so-called double convex backrest (towards the front) An inclined footrest Statement of the invention
[0004] By these modifications the present invention aims to overcome the drawbacks of the prior art, namely spinal pain, by proposing with this chair to restore better spinal physiology to reduce spinal pain.
[0005] This backrest will be called DOUBLE CONVEX (X2 CVX) because it is both convex in the horizontal plane and convex in the vertical plane. In both cases, it is convex towards the front.
[0006] The seat is shaped in accordance with current art but the fact that it is horizontal, (5) flat and above all not hollowed out is reinforced by the same height of the four legs.
[0007] The function of a chair remains to sit rather than stand, a backrest (4) serves as support for the back. This backrest is located at the rear part of the chair.
[0008] Far from blocking the back and immobilizing it to prevent any fall backwards, as in the current art, this backrest of the invention, with its new shape, serves as support while freeing spinal mobility. Description of the drawings
[0009] Other advantages, aims and characteristics of the present invention will emerge from the description which follows, given for explanatory and non-limiting purposes, with reference to the appended drawings. However, it should be noted that the figures are not to scale and are only intended to highlight the transformations.
[0010] [Fig-1] [Fig.l] represents a chair seen from ¾ front.
[0011] [Fig.2] [Fig.2] represents the chair of the invention in left profile.
[0012] [Fig.3] [Fig.3] represents the view of another model of chair established according to the same principle, left profile view.
[0013] [Fig.4] [Fig.4] represents the chair in left profile view, with inclined plane.
[0014] [Fig.5] [Fig.5] represents the inclined plane for standing in profile view LEFT. Detailed description of the invention
[0015] With reference to the above-mentioned figures, the double convex chair has, as described in [Fig.l] and [Fig.2], a horizontal seat (5), front and rear legs of equal height, a backrest (4) whose horizontal convexity lines line (2) and line (3) are of different degrees. Thus the degree of horizontal convexity of the upper line (2) called thoracic is greater than that of the lower line (3) called lumbar.
[0016] The notion of vertical convexity of the backrest is also visible on the device 100 of figures 1 and 2 with the line 1. This line of vertical convexity (1) will always be located above the high horizontal convexity line (2) called thoracic • With reference to [Fig.3] the left profile view represents another model of chair which establishes according to the same principle described in relation to the vertical line (8) the angle of inclination of the backrest line (9) as well as its vertical convexity line (10) • With reference to [Fig.4], the left profile view with the inclined plane (13) shows that advantageously the front legs of the chair (6) can be perforated on a transverse plane so as to support an axis allowing the installation of an inclined plane (13) on which the legs will rest and that advantageously at the level of the front legs (6) depending on the installation height of the transverse axis the degree of inclination (14) of the inclined plane (13) can vary.
[0017] Positioned between the two front legs (6) of the chair, this inclined plane (13) will serve to increase lumbar muscular action, limiting the appearance and development of spinal pain.
[0018] Being able to pivot freely around its transverse axis, said inclined plane (13) will not hinder the possibilities of storage by stacking. This property will be used by convex double chairs in schools, restaurants, etc.
[0019] These embodiment models being in no way limiting, it will be possible in particular to consider variants of the invention comprising only a selection of characteristics described or illustrated, if this selection is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art.
[0020] In fact, and depending on this selection of characteristics, a stool can also have an inclined footrest. Similarly, an office chair can have an inclined plane, called a base. The base, fixed to the wheel axles, will remain retractable so as not to disrupt transfers, or will be a simple occasional addition.
[0021] As described with reference to [Fig. 5], and depending on the selection of characteristics, the inclined plane (13) can also be used alone for current office work known as sit-stand. In this case, according to the device 300 of [Fig. 5], the feet will rest entirely on a flat, linear surface (13) or on a curved surface (7), maintaining in both cases an angle (14) of 5° + / - 3°
[0022] Depending on the selection of characteristics and the installation methods, the inclined plane can be used for variants of the invention which will be: • school chairs • stools • public benches • seats or benches for passenger shelters • office chairs • home chairs
[0023] All materials can be used for the construction of the chair: • resin • thermoplastic (polyethylene-polypropylene), • wood • metal • etc.
[0024] For purely illustrative purposes, this chair can be made from a single piece, or by assembling initially separate parts, from the same material, or hybrid parts, i.e. from several materials. Principle of the chair
[0025] The double convex chair is intended to reduce spinal pain. The immediate action of the double convex backrest is to restore vertebral mobility in rotations which is an integral part of the vertebral coupling that exists for all movement including sitting. (Sholten and Veldhuisen).
[0026] Since the movement is organized according to the least resistance, (Sholten and Veldhuisen) and since thanks to the double convex backrest the shoulders and shoulder blades are no longer blocked, the vertebrae can finally tilt and rotate at the same time. (Coupling).
[0027] Not only do the vertebrae move again with the double convex backrest, but the muscles become active again. Having become active again, they are therefore capable of permanent adjustments, contributing to good vertical spinal statics which reduces pain.
[0028] Shoulders and shoulder blades, which have become mobile again thanks to the double convex backrest, contribute to a more mobile thorax and therefore to better quality breathing. Respiratory volumes are now greater and the respiratory muscle strokes become wider again.
[0029] The restoration of greater mobility of the main respiratory muscle contributes through the vertebral insertions of said diaphragm muscle to better control of spinal statics.
[0030] This muscular action, which protects against lower back pain by preserving and promoting good vertebral alignment, comes directly from the double convex shape of the backrest.
[0031] The functionality of the innovative double convex backrest, which is to restore spinal physiology, only makes sense and makes sense with a horizontal seat. The horizontal seat reduces the lumbar delordosis resulting from current art, delordosis which for many people initiated spinal pain from prolonged sitting. Conclusion
[0032] The conjunction of the effects of the two convexities (horizontal and vertical) brings back: vertebral mobility, respiratory quality and spinal muscles to their automatic protective lumbar activity, actions reinforced by the horizontal seat
[0033] Finally, to facilitate not only the triggering and / or strengthening of the automatic lumbar muscular protective activity, a downward and forward inclined plane on which all or part of the feet will rest should be used. But the action of this inclined plane will also and above all contribute to perfect awareness of the correct position of the spine.
Claims
Claims
1. Chair for sitting, characterized in that the seat is horizontal.
2. Chair according to claim 1, characterized in that the three or four legs supporting the seat are of equal height.
3. Chair according to claims 1 or 2 characterized in that the two front legs can be crossed transversely by an axis carrying a plane inclined downwards and forwards, which plane can pivot around said axis to facilitate the storage by stacking of chairs equipped with this system.
4. Chair according to any one of claims 1 to 3, characterized in that the backrest is convex in the horizontal and vertical planes.
5. Chair according to any one of claims 1 to 4 characterized in that the horizontal and vertical convexities are convex towards the front.
6. Chair according to any one of claims 1 to 5 characterized in that the degrees of horizontal convexities increase from bottom to top.
7. Chair according to any one of claims 1 to 6 characterized in that the vertical convex aspect of the backrest starts only in the upper part of said backrest, above the high horizontal thoracic convexity line.
8. Chair according to any one of claims 1 to 7 characterized in that the inclination of the backrest towards the rear is 15 ° (+ / - 5 °)
9. Chair according to any one of claims 1 to 8 characterized in that an inclined plane can be placed or fixed, while remaining retractable, on the wheel axles if the chair is equipped with one.