BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ); in particular, to a chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) wherein a plurality of raising-lowering apparatus are installed inside the seat cushion and the back cushion of the chair thereby allowing to actively support the gaps in human sitting-posture vertebral curve through the raising-lowering apparatus, such that the user may sit or lie in the chair comfortably. 
         [0003]    2. Description of Related Art 
         [0004]    Various chairs are available for applications in different occasions, e.g., sofa, office chairs, dining table seats and the like, all of which being used for appropriate scenarios. However, the basic function of the above-said chairs is simply to allow people to sit down to prevent standing of long duration. 
         [0005]    So far, the improvements on currently available chairs mostly resort to the cotton cushion placed in the seat cushion and the back cushion of the chair, and the objective of such a cotton cushion mainly characterizes in softness and coziness thereof without any other additional features. 
         [0006]    As such, regarding to defects possibly existing in the conventional chair, it remains to be desired for many potential opportunities of improvements in terms of the design thereof. 
         [0007]    Seeing that the conventional chair may present various disadvantages, the inventors of the present invention have made numerous efforts to studies and researches for a long time in order to implement innovations and improvements over the conventional chair, thus at last obtaining the chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) as disclosed in the present invention. 
       SUMMARY OF THE INVENTION 
       [0008]    One objective of the present invention is to provide a chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) wherein a plurality of raising-lowering apparatus is installed inside the seat cushion and the back cushion of the chair thereby that the user is allowed to, upon purchasing the chair, set up the position of the raising-lowering apparatus in advance, or otherwise to adjust the position of the raising-lowering apparatus as sitting or lying in the chair, so as to actively support the sitting-posture vertebral curve such that the user may sit or lay in the chair comfortably. 
         [0009]    Another objective of the present invention is to provide a chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) offering advantages such as convenient operability, easy assemblage and high feasibility and the like. 
         [0010]    The disclosed chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) enabling achievement of the aforementioned objectives comprises a seat cushion and a back cushion, which seat cushion and back cushion being installed therein with at least a set of raising-lowering apparatus; the raising-lowering apparatus consists of a baseboard, with a plurality of supporting brackets extending thereon; a power generating device is fixedly installed at the center of the baseboard, and a power output shaft of the power generating device is coupled in screw to the center of a movable base, such that the movable base is allowed to make upward/downward movements through drives from the power output shaft, thereby allowing the movable base to be positioned on top of the chassis and supported by the supporting bracket in order to increase the stability of the movable base; a plurality of elastic bodies are installed on the movable base, and the elastic body is installed therein with a sensing rod which is configured in penetration through the bottom side of the movable base, such that the elevation sensor placed on the lateral side of the baseboard is able to detect the lowered elevation of the elastic body, in which the elevation sensor and the power generating device are electrically coupled to a control circuit; when a user sits in the chair, it is possible to adjust the settings of the raising-lowering apparatus via the control circuit such that the power generating device in the raising-lowering apparatus can bring the movable base to move up to a required elevation in order to adjust the seat cushion and the back cushion of the chair to a sitting-posture most natural to human body, thus allowing the user&#39;s body to feel relaxed and achieving the objective of comfortable sitting-posture. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]    The technical contents of the present invention as well as purposes and effects thereof can be further appreciated with reference to the detailed descriptions and appended drawings of the preferred embodiment according to the present invention, wherein: 
           [0012]      FIG. 1  shows a stereo diagram of the chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) in accordance with the present invention; 
           [0013]      FIG. 2  shows a diagram of the raising-lowering apparatus in the chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) in accordance with the present invention; and 
           [0014]      FIGS. 3A and 3B  show diagrams for the embodiment of the chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) in accordance with the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0015]    Refer now to  FIG. 1  and  FIG. 2 , wherein a chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) in accordance with the present invention is shown, basically comprising a seat cushion  1  and a back cushion  2 , which seat cushion  1  and the back cushion  2  being installed therein with at least one set of raising-lowering apparatus  10 , in which the raising-lowering apparatus  10  consists of: 
         [0016]    a baseboard  3 , with a sideboard  31  extending upward from the both ends of the baseboard  3  and a plurality of supporting brackets  32  extending upward from the top side of the baseboard  3 , in which the supporting bracket  32  is equivalently elevated as the sideboard  31 , an elevation sensor  33  is installed on the sideboard  31  and a power generating device  34  is fixedly installed at the center of the baseboard  3 , and in which the power generating device  34  consists of a power output shaft  341 , and the power output shaft  341  may be a screw rod, while the power generating device  34  may be a motor, a hydraulic cylinder or a pneumatic cylinder etc.; 
         [0017]    a moveable base  4 , with a positioning trough  41  being installed on the moveable base  4  and a screw hole (not shown) being installed at the center of the positioning trough  41 , in which a plurality of elastic bodies  42  is arranged on the positioning trough  41  at an interval of equal distance, which sensing rod  43  being combined inside the elastic body  42 , the top end of the sensing rod  43  being fixedly connected with top end of the elastic body  42 , and also a through hole or an opening (not shown) corresponding to the sensing rod  43  is installed at the bottom side of the moveable base  4  such that the bottom end of the sensing rod  43  is allowed to penetrate the through hole or opening out of the bottom side of the moveable base  4 ; in which the screw hole in the moveable base  4  is screwed for connection with the power output shaft  341  of the power generating device  34  such that the moveable base  4  is located at the top of the baseboard  3  and supported by the sideboard  31  and the supporting bracket  32 , and the moveable base  4  can make upward/downward movements as being driven by the power output shaft  341  of the power generating device  34 ; 
         [0018]    a control circuit  5 , which is electrically coupled to the elevation sensor  33  on the baseboard  3  and the power generating device  34 , and upon reception of an elevation sensing signal from the elevation sensor  33 , drives the power generating device  34  in each set of raising-lowering apparatus  10  inside the seat cushion  1  and the back cushion  2  to operate according to the received signal, thereby allowing the power output shaft  341  of the power generating device  34  to bring the moveable base  4  to move upwardly or downwardly. 
         [0019]    Refer next to  FIGS. 3A and 3B , wherein diagrams for the embodiment of the present invention are shown, in which, when the user  6  takes a seat in the chair, the elastic body  42  of the plural raising-lowering apparatus  10  inside the seat cushion  1  and the back cushion  2  will be lowered to various elevations due to different weights in each portion of the body, causing the sensing rod  43  to move down such that the elevation sensor  33  can detect the elevation of the sensing rod  43  and transfer the detection result to the control circuit  5  for determinations. The control circuit  5  accordingly determines the person&#39;s sitting-posture vertebral curve and drives the power generating device  34  of the raising-lowering apparatus  10  corresponding to the vertebral curve determined by the control circuit  5  to move the moveable base  4  to the required elevation, so as to adjust the seat cushion  1  and the back cushion  2  to the most natural vertebral curve fitting with the user&#39;s body, thus providing active supports to the sitting-posture vertebral curve of the user  6  and allowing the user  6  to feel cozy and comfortable in relaxation as sitting in the chair. 
         [0020]    Furthermore, the control circuit  5  may be coupled to an input interface, e.g., a remote controller, such that, when the user  6  sits in the chair equipped with the raising-lowering apparatus  10 , it is possible to adjust the elevation operation in each raising-lowering apparatus  10  of the user&#39;s proper accord, thereby providing active supports to the sitting-posture vertebral curve of the user  6  and allowing the user  6  to feel cozy and comfortable in relaxation as sitting in the chair. 
         [0021]    In addition, upon purchasing the chair, the user  6  may also directly set up the elevation operation for each set of the raising-lowering apparatus  10  and have the elevation operation of the raising-lowering apparatus  10  memorized in the control circuit  5  in order to acquire and hold the sitting-posture vertebral curve of the user  6 . When later on someone sits in the chair having completed the above-said memorization process, the control circuit  5  in the chair will determine whether the person currently sitting in the chair is the original user or not based on the lowered elevation of the elastic body  42  in each set of the raising-lowering apparatus  10  inside the seat cushion  1  and the back cushion  2 ; if yes, the power generating device  34  of each raising-lowering apparatus  10  inside the seat cushion  1  and the back cushion  2  will be driven to bring the moveable base  4  to the required elevation so as to adjust the seat cushion  1  and the back cushion  2  to the most natural vertebral curve of human body for providing active supports to the sitting-posture of the user  6 , thus allowing the user  6  to feel cozy and comfortable in relaxation as sitting in the chair. 
         [0022]    In the aforementioned embodiment, once the user stands up and leaves the chair, the elastic body  42  of the raising-lowering apparatus  10  will restore; after restoration of the elastic body  42 , the power generating device  34  of the raising-lowering apparatus  10  will return the moveable base  4  in the original position. 
         [0023]    The chair adapted to adjust according to person&#39;s sitting-posture vertebral curve ( 1 ) according to the present invention, in comparison with prior art, provides the following advantages: 
         [0024]    1. since a plurality of raising-lowering apparatus is installed in the seat cushion and the back cushion of the chair thereby that the user is allowed to, upon purchasing the chair, set up the position of the raising-lowering apparatus in advance, or otherwise to adjust the position of the raising-lowering apparatus as sitting or lying in the chair, so as to actively support the human sitting-posture vertebral curve such that the user may sit or lay in the chair comfortably; 
         [0025]    2. the present invention provides advantages such as convenient operability, easy assemblage and high feasibility and the like. 
         [0026]    The aforementioned detailed descriptions are directed to concrete illustrations of the embodiments according to the present invention, but such embodiments are by no means to limit the scope of the present invention. All effectively equivalent practices or modifications made thereto without departing from the spirit of the present invention are deemed as being included within the scope of the present invention. 
         [0027]    In summary, the present invention provides innovations in spatial configuration and enhances multiple effects over prior art commodities as well, which fully matches the legal requirements for patent application in terms of novelty and advancement, thus proposing the present disclosure therefore.
A chair adapted to adjust according to a person's sitting-posture vertebral curve, mainly includes a seat cushion and a back cushion. Plural raising-lowering apparatus are provided in the seat cushion and back cushion, the position of the raising-lowering apparatus could be automatically adjusted or predefined. When a user is sitting in the chair, the raising-lowering apparatus would raise to a predefined position according to the user's sitting-posture vertebral curve, to support the user's sitting-posture vertebral curve, so that the user would feel comfortable.