Abstract:
The adjustable variant resistance exercise apparatus has installed several different resistant elastic springs and can provide variety of resistance for exercise. Man, woman, boy and girl can share the same one of adjustable variant resistance exercise apparatus for exercise. User can upgrade or downgrade exercise resistant power by adding more or remove some elastic rubber bands for exercise.

Description:
THE BACKGROUND OF THE INVENTION 
     Adults and teenagers have different muscular strength. Besides, after a long period of time of exercise everyone&#39;s muscular strength will get stronger and will need more powerful resistance exercise apparatus for exercise. Adjustable resistance exercise apparatus can provide variant resistance and can upgrade or downgrade the resistance power to suit individual&#39;s need for exercise. 
     THE BRIEF SUMMARY OF THE INVENTION 
     People exercise to grow their muscles and have to upgrade exercise apparatus for more powerful resistance. Adjustable resistance exercise apparatus can install several exchangeable variant resistance rubber bands for upgrading or downgrading resistance power. Therefore the user can upgrade the resistance power by adding more or more stronger resistance rubber bands. The user can also downgrade the resistance power by removing some resistance rubber bands or replacing the stronger resistance rubber bands with less powerful resistance rubber bands. All family members can share the same one of adjustable resistance exercise apparatus for exercise. 
    
    
     
       THE BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of adjustable resistance exercise apparatus. 
         FIG. 2  is a perspective view of dissected tubular structure of adjustable resistance apparatus to reveal the inner intact key resistance apparatus. 
         FIG. 3  is a perspective view of components of adjustable resistance exercise apparatus. 
         FIG. 4  is a perspective view of components of inner key resistance apparatus. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now in detail to the drawings numeral  11  of  FIG. 1  is adjustable resistance exercise apparatus. Numeral  12  of  FIG. 2  is the dissected tubular structure of adjustable resistance exercise apparatus with the intact inner key resistance apparatus to reveal its position inside tubular structure. Numeral  13  of  FIG. 3  is the components of adjustable resistance exercise apparatus. Numeral  14  of  FIG. 4  is components of the inner key resistant apparatus. Numeral  15  of  FIGS. 1, 2 and 3  is a rope. Numeral  16  of  FIGS. 1 and 3  is lower cap. Numeral  17  of  FIG. 2  is dissected lower cap  16 . Numeral  18  of  FIGS. 1 and 3  is top cap. Low cap  16  and top cap  18  are preferably identical. Numeral  19  of  FIG. 2  is dissected top cap  18 . Numeral  20  of  FIGS. 1, 2 and 3  is tunnel of lower cap  16 . Numeral  21  of  FIGS. 1, 2 and 3  is tunnel of top cap  18 . Tunnel  20  and tunnel  21  are identical. Rope  15  can pass easily through tunnels  20  and  21 . Numeral  22  of  FIGS. 2 and 3  is hook of rope  15 . Numeral  23  of  FIGS. 2 and 3  is ring of rope  15 . Hook  22  can hook on ring  23 . Hook  22  and ring  23  can easily pass through tunnels  20  and  21 . After squeezing top cap  18  and lower cap  16  inwardly to relax rope  15  one can pull hook  22  and ring  23  of  FIG. 2  out of tunnel  20 . Numeral  24  of  FIGS. 1 and 3  is outer tube. Numeral  25  of  FIG. 2  is the dissected outer tube  24 . Numeral  26  of  FIGS. 1 and 3  is inner tube. Numeral  27  of  FIG. 2  is the dissected inner tube  26 . Outer tube  24  can admit easily and snugly inner tube  26 . Inner tube  26  can telescope and slide easily inside outer tube  24 . Outer tube  24  and inner tube  26  are preferable to have the same length and overlap each other for about one quarter to one third of their lengths. Numeral  28  of  FIGS. 2 and 3  is the inner key resistance apparatus. Numeral  29  of  FIGS. 2, 3 and 4  is long longitudinal side rod of inner key resistance apparatus  28 . Numeral  30  of  FIGS. 2, 3 and 4  is stopper. Stopper  30  is preferably installed at or near the middle portion of inner side of long longitudinal side rod  29 . Numeral  31  of  FIG. 4  is a sliding lever. Numeral  32  of  FIGS. 2, 3 and 4  is lever arm. Numeral  33  of  FIGS. 2, 3 and 4  is sliding ring. Sliding lever  31  of  FIGS. 2, 3 and 4  has one sliding ring  33  installed at each end. Numeral  34  of  FIG. 4  is central canal of sliding ring  33 . Central canal  34  surrounds long longitudinal side rod  29  and slides easily on it. Stopper  30  of  FIGS. 2, 3 and 4  can stop sliding ring  33  of sliding lever rod of  FIGS. 2, 3 and 4 . Numeral  35  of  FIGS. 2, 3 and 4  is lower short horizontal rod. Numeral  36  of  FIGS. 2, 3 and 4  is upper short horizontal rod. Upper short horizontal rod  36  and lower short horizontal rod  35  are identical and parallel. Sliding lever  31  is installed on two long longitudinal side rods  29  in between stopper  30  and lower short horizontal rod  35 . Numeral  37  of  FIGS. 2, 3 and 4  is roller. Roller  37  surrounds and rolls smoothly on upper rod  36 . Numeral  38  of  FIGS. 2, 3 and 4  is elastic rubber band. Elastic rubber band  38  can be of different elastic stretch power, such as 10 pounds or 15 pounds or 20 pounds etc. Numeral  39  of  FIGS. 2, 3 and 4  is hook. There is one hook  39  installed at each end of each elastic rubber band  38 . Hook  39  can hook on lower short horizontal rod  35  and lever arm  32 . Numeral  40  of  FIGS. 2 and 3  is brim of the inner tube  26 . The way to install elastic rubber band  38  is to hook one hook  39  of one elastic rubber band  38  on lower short horizontal rod  35  and then to circle elastic rubber band  38  around roller  37  and then to hook another hook  39  of the same elastic rubber band  38  on lever arm  32  to produce slight tension of elastic rubber band  38 . The more elastic rubber bands  38  are used the stronger the resistance power will be and the stronger elastic rubber band is used the stronger resistance power will be. The length of sliding lever  31  is longer than the outer diameter of inner tube  26  and shorter than the inner diameter of outer tube  24 . The width of inner key resistance apparatus  28  from one outside rim of one long longitudinal side rod  29  to the other outside rim of another long longitudinal side rod  29  is a little bit shorter than the inner diameter of inner tube  26 . Therefore the inner key resistance apparatus  28  can be inserted and stored snugly inside inner tube  26  and sliding ring  33  can rest on the brim  40  of inner tube  26 . When top cap  18  and lower cap  16  are squeezed inwardly with two hands brim  40  of inner tube  26  will push sliding ring  33  of sliding lever  31  to stretch elastic rubber band  38  to produce exercise resistance to develop pectorals. When both sides of rope  15  are pulled outwardly with both hands brim  40  of inner tube  26  will also push sliding ring  33  of sliding lever  31  to stretch elastic rubber band  38  to produce exercise resistance to develop deltoids and back muscles. The user can use one foot or two feet to step on one side of rope  15  and use one hand or both hands to pull upward another side of rope  15  to develop biceps and quadriceps. By adding more or removing some elastic rubber band  38  the resistance power will increase or decrease. By replacing the weaker elastic rubber band  38  with stronger elastic band  38  the resistance power will increase and vice versa.