Abstract:
An exercise assembly for a chair includes a plurality of elastic members having a central portion extending between a joining member coupled to a bottom of the chair&#39;s seat and a fixing member coupled to a base of the chair. The tension force in each elastic member is adjusted by adjusting the height of the chair seat relative to the base to thereby change the distance between the fixing member and the joining member, and is substantially the same in each elastic member since they are generally uniformly stretched.

Description:
FIELD OF THE INVENTION 
   This invention relates to an attachment of a chair, in particular to an exercise assembly used for a chair. 
   This invention also relates to a chair, in particular to a chair used for exercise with the above-mentioned exercise assembly. 
   BACKGROUND OF THE INVENTION 
   Nowadays many office workers who usually sit on the chairs and face computers during their working-time have no time to take exercise for extended periods, so that their health is deteriorated. 
   Accordingly, a chair is developed in which an exercise assembly is attached to a conventional chair. Therefore, exercise may be taken in the office. However, the existing chairs have hulking structures such as metal chains, which are cumbersome to be conveyed. Elastic members are also used in some existing constructions in which, usually, only the elastic force of the elastic members themselves is used, but the elastic force is too small to be adjusted and is inconvenient to be used. 
   To sum up, the chairs are obviously inconvenient and flawed during use due to the disadvantages in their structures. There is therefore a need for improvement. 
   SUMMARY OF THE INVENTION 
   The object of this invention is to provide a kind of exercise assembly used in a chair to facilitate exercising. 
   The present invention also provides a chair having said exercise assembly to facilitate exercising: 
   In order to obtain the above object, in one aspect of the present invention, a chair used for exercise is provided, which comprises a backrest, a seat, a support provided under the seat, and an exercise assembly comprising: 
   a plurality of elastic members; 
   a fixing member fixed on the support, comprising: a base, and a first and second fixing part extending from two sides of the base, each fixing part having a plurality of mounting parts, the number of the mounting parts being corresponding to the number of the elastic members; 
   a joining member fixed under the seat and above the fixing member, and having a plurality of joining parts, the number of the joining parts being corresponding to the number of the elastic members; 
   wherein the elastic members sequentially pass through the corresponding mounting part of the first fixing member, the corresponding jointing part of the jointing member and the corresponding mounting part of the second fixing member, respectively. 
   In the chair of the present invention, the base of the fixing member may be a hollow column. 
   In the chair of the present invention, the mounting part may have an annular structure. 
   In the chair of the present invention, an air pump for adjusting a height of the seat may be provided on the support. 
   In the chair of the present invention, the number of the elastic members may be three. 
   Particularly, two ends of one of the three elastic members may be mounted on two sides of a top of the backrest, and the ends of the other two elastic members may be mounted under the seat. 
   In the chair of the present invention, the elastic member may be an elastic band. 
   In the chair of the present invention, a handle which is convenient to be grasped by a user may be provided at each end of the elastic member. 
   In the chair of the present invention, a receiving part for receiving the handle may be provided under the seat. 
   In another aspect of the present invention, an exercise assembly is provided, which comprises: 
   a plurality of elastic members; 
   a fixing member comprising: a base, a first and second fixing part extending from two sides of the base, each fixing part having a plurality of mounting parts, a number of the mounting parts be corresponding to a number of the elastic members; and 
   a joining member having a plurality of joining parts, the number of the joining parts being corresponding to the number of the elastic members; 
   wherein the elastic members sequentially pass through the corresponding mounting part of the first fixing member, the corresponding jointing part of the jointing member and the corresponding mounting part of the second fixing member, respectively. 
   In the exercise assembly of the present invention, the number of the elastic members may be three. 
   In the exercise assembly of the present invention, the elastic member may be an elastic band. 
   In the exercise assembly of the present invention, the base of the fixing member may be a hollow column. 
   In the exercise assembly of the present invention, the mounting part may have an annular structure. 
   In the exercise assembly of the present invention, the joining part may have an annular structure. 
   This invention has two advantages: 
   1. The stretching equilibrium can be achieved. The tension force in each elastic member is substantially same, since all the elastic members are mounted through the fixing members and the joining members and thus are generally uniformly stretched when the distance between the fixing member and the joining member is adjusted. 
   2. An aesthetically advantageous appearance can be obtained. Tubular structures in which the elastic members can be hidden may be used in the chair. In particular, since the receiving part for receiving the handles is provided under the seat, a good appearance can be obtained. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view of an exercise assembly according to the present invention. 
       FIG. 2  is a perspective view of a fixing member in the exercise assembly according to the present invention. 
       FIG. 3  is a perspective view of a chair used for exercise according to the present invention. 
       FIG. 4  is a partial view of a chair used for exercise according to the present invention showing a mounting state of the fixing member and elastic members of the exercise assembly. 
       FIG. 5  is another partial view of a chair used for exercise according to the present invention showing a position of a joining member of the exercise assembly. 
     
       
         
               
             
               
               
             
           
               
                   
               
               
                 LIST OF PARTS 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 1 
                 exercise assembly 
               
               
                 11 
                 fixing member 
               
               
                 1121 
                 mounting part 
               
               
                 12 
                 elastic member 
               
               
                 131 
                 joining part 
               
               
                 2 
                 chair 
               
               
                 21 
                 backrest 
               
               
                 24 
                 sliding device 
               
               
                 27 
                 fixing block 
               
               
                 111 
                 base of fixing member 
               
               
                 113 
                 second fixing part 
               
               
                 13 
                 joining member 
               
               
                 14 
                 handle 
               
               
                 22 
                 seat 
               
               
                 25 
                 receiving part 
               
               
                 112 
                 first fixing part 
               
               
                 1131 
                 mounting part 
               
               
                 23 
                 support 
               
               
                 26 
                 air pump 
               
               
                   
               
             
          
         
       
     
   

   DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Below is a further explanation of the present invention with reference to the attached drawing and embodiments: 
   The First Embodiment 
   Referring to  FIG. 1  and  FIG. 2 , an exercise assembly  1  for a chair comprises a fixing member  11 , a plurality of elastic members  12  and a joining member  13 . 
   The number of the elastic members  12  may be three. Each elastic member  12  may be an elastic band. 
   The fixing member  11  comprises a base  111 , a first fixing part  112  and a second fixing part  113 . The base  111  of the fixing member  11  is a hollow column. The first fixing part  112  and the second fixing part  113  extend from two sides of the base  111 . Each of the first fixing part  112  and the second fixing part  113  has a plurality of mounting parts  1121 ,  1131 , the number of which is corresponding to that of the elastic members  12 . Since the number of the elastic members  12  in this embodiment is three, the number of the mounting parts  1121  is three, too. Each of the mounting parts has an annular structure. The middle one of the mounting parts has a structure with a shape of a complete ring and each of the other two has a structure with a shape of a semi ring. 
   The joining member  13  has a plurality of joining parts  131  corresponding to the elastic members  12  in number. Each of the joining parts  131  has an annular structure. 
   The joining member  13  is arranged above the fixing member  11 . As shown, the joining parts  131  and the mounting parts  1121 ,  1131  all have annular structures, some of which may be shaped as a complete ring or some of which may be shaped as a semi ring. The number of the rings is three, i.e. equal to the number of the elastic members  12 . Each of the elastic members  12  passes through the mounting parts  1121  of the first fixing part  112  of the fixing member  11 , the jointing parts  131  of the jointing member  13 , and then the mounting parts  1131  of the second fixing member  113  of the fixing member  11 . That is to say, the elastic members  12  sequentially pass through the corresponding mounting part  1121  of the first fixing part  112  of the fixing member  11 , the corresponding jointing part  131  of the jointing member  13  and the corresponding mounting part  1131  of the second fixing member  113  of the fixing member  11 , respectively. Thus, as shown in the drawings, each of the elastic bands is formed in a “W” shape. 
   In use, when the distance between the fixing member  11  and the joining member  13  is increased, the elastic members are also stretched with the same elastic force. 
   The Second Embodiment 
   Referring to  FIGS. 1 to 5 , an exercise chair  2  used for exercise comprises: a backrest  21 ; a seat  22 ; a support  23  under the seat  22 ; and a sliding device  24  connected under the support  23 . 
   An air pump  26  for adjusting the height of the seat  22  is provided on the support  23  of the chair  2 . For adjusting the height of the seat  22 , an adjusting valve is provided in the air pump  26 , so that the height of the seat can adapt to the height of the user. A receiving part  25  is fixed under the seat  22  of the chair  2  and is formed by bending an iron sheet. The sliding device  24  is connected under the support  23  to facilitate moving the chair  2 . 
   The chair  2  is provided with an exercise assembly  1  which comprises a fixing member  11 , a plurality of elastic members  12  and a joining member  13 . 
   The number of the elastic members  12  may be three. Each of the elastic members  12  is an elastic band. A handle  14 , which is convenient to be grasped by a user, is provided at two ends of each of the elastic members  12 . Two ends of one of the three elastic members  12  is mounted at two sides of the top of the backrest, so that the elastic member can be hidden in the tubular structure employed in the chair. The two ends of each of the other two elastic members are mounted under the seat. Thus, the two elastic members are hidden in the receiving part  25 . Consequently, the chair has a better appearance. 
   The fixing member  11  comprises a base  111 , a first fixing part  112  and a second fixing part  113 . The base  111  of the fixing member  11  is a hollow column. The first fixing part  112  and the second fixing part  113  extend from two sides of the base  111 . Each of the first fixing part  112  and a second fixing part  113  has a plurality of mounting parts  1121 ,  1131 . The number of mounting parts is corresponding to that of the elastic members  12 . Since the number of the elastic members  12  in this embodiment is three, the number of the mounting parts is three, too. Each of the mounting parts has an annular structure. As shown in the drawings, the middle one of the mounting parts has a structure with a shape of a complete ring and each of the other two has a structure with a shape of a semi ring. The fixing member  11  is fixed to the support  23 . In this embodiment, a fixing block  27  is welded to the support  23  so as to secure that the fixing member  11  is fixedly connect to the support  23 . 
   A joining member  13  is provided with a plurality of joining parts  131  corresponding to the elastic members  12  in number. Each of the joining parts  131  has an annular structure. The joining members  13  are fixed under the seat  22 . 
   The fixing member  11  is fixed to the support  23  and the joining members  13  are provided under the seat  22 . Therefore, the joining members  13  are arranged above the fixing member  11 . As shown, the joining parts  131  and the mounting parts  1121 ,  1131  all have annular structures, some of which may be shaped as complete rings or some of which may be shaped as semi rings. In the embodiment, the number of the rings is three, i.e. equal to the number of the elastic members  12 . Each of the elastic members  12  passes through one mounting part  1121  of the first fixing part  112  of the fixing member  11 , one jointing part  131  of the jointing member  13 , and then one mounting part  1131  of the second fixing member  113  of the fixing member  11 . That is to say, the elastic members  12  sequentially pass through the corresponding mounting part  1121  of the first fixing part  112  of the fixing member  11 , the corresponding jointing part  131  of the jointing member  13  and the corresponding mounting part  1131  of the second fixing member  113  of the fixing member  11 , respectively. Thus, as shown in the drawings, each of the elastic bands is formed in a “W” shape. 
   In use, the user can take exercise upon holding the handles  14  provided on the ends of the elastic members. If the extensile force of the elastic bands is too small, the user can adjust the air pump  26  to increase the distance between the fixing member  11  and the joining member  13 , so as to stretch each of the elastic members at the same time. Therefore, the elastic force of all the elastic bands is increased and the extensile force acting on every handle  14  is the same to one another. That is to say, the user can adjust the extensile force of the elastic bands according to his/her practice and body conditions to take exercise. 
   While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. Therefore all such changes and modifications fall within the metes and bounds of the claims are intended to be embraced by the appended claims.