Abstract:
A rotatory abdominal crunch machine mainly uses a rotating disc fitted on an eccentric revolution disc to assist the user in swinging his or her waist in circular motion so as to strengthen the abdominal muscles. A rolling element, which is embedded in said rotating disc, drives said rotating disc to rotate in 360 degrees.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    I. Field of the Invention 
         [0002]    A rotatory abdominal crunch machine relates to a machine that assists the user in swinging his or her body to strengthen the muscles, particularly to a machine that assists the user in swinging his or her waist in circular motion so as to achieve powerful and tight abdominal muscles. 
         [0003]    II. Description of the Prior Art 
         [0004]    Each of the abdominal workout equipment in the market has its own motion design that assists the user in strengthening the muscles of different parts. The swing machine of the prior art mainly uses a rotating disc to assist the user&#39;s workout for strengthening the muscles. With reference to  FIG. 1 , which is a three-dimensional explored diagram showing a swing machine of the prior art, the swing machine  10  comprises a support rack  101 , a seat rack  102 , a rotating disc  104 , and a seat  105 . The support rack  101  is used to support the seat rack  102 . The rotating disc  104 , which is fitted on the seat rack  102 , comprises a surface disc  1042 , a base disc  1042  and a rolling element  1043 , which is embedded in said base disc  1042 . Surface disc  1041  of the rotating disc  104  is fitted beneath a seat  105 . An anti-slip belt  1031 , which girds said surface disc  1041 , holds a pound-force adjuster  1032  on one of its ends. The rolling element  1042  embedded in the rotating disc  104  allows said rotating disc  104  to rotate. The user sits on seat  105  fitted on the rotating disc  104  and swings his or her waist so as to strengthen the abdominal muscles. However, the swing machine of the prior art not really offers circular motion that allows the user to completely exercise the abdominal muscles. 
       SUMMARY OF THE INVENTION 
       [0005]    Main objective of the present invention is to offer a rotatory abdominal crunch machine that allows the user to properly perform abdominal exercises and achieve results in the most efficient manner. Moreover, it aims at offering a machine that is easy for anyone to use and takes not much space for storage. 
         [0006]    Further aspects, objects, and desirable features of the present invention will be better understood from the detailed description and drawings that follows in which various embodiments of the disclosed invention are illustrated by way of examples. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]      FIG. 1  is a three-dimensional view showing explored diagram of a swing machine of the prior art. 
           [0008]      FIG. 2  is a three-dimensional view showing explored diagram of the invention. 
           [0009]      FIG. 3  is a sectional view showing assembly of the invention. 
           [0010]      FIG. 4  is a sectional view of another embodiment of the invention. 
           [0011]      FIG. 5  is a sectional view of embodiment I of the invention. 
           [0012]      FIG. 6  is a sectional view of embodiment II of the invention. 
           [0013]      FIG. 7  is a sectional view of embodiment III of the invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0014]    With reference to  FIG. 2 , which is a three-dimensional explored diagram of the present invention, the rotatory abdominal crunch machine  20  comprises a support rack  201 , a seat rack  202 , a pound-force adjuster  209 , a first rotating disc  204 , a revolution disc  205  and a second rotating disc  206 . The pane-shaped seat rack  202  comprises two handrails  203 , which are screwed in on right and left sides, a plurality of holes  2021 , which are formed on left and right bars. Fit a plurality of knobs  208  into holes  2021  so as to fasten the seat rack  202  on the support rack  201 . A plurality of assembly holes  2022  is formed on surface of the seat rack  202 . Corresponding to which, a plurality of assembly hole  20411  are formed on rim of base disc  2041  of the first rotating disc. Fit those assembly holes  2022 ,  20411  together so as to fit the first rotating disc  204  on the seat rack  202 . The first rotating disc  204  comprises a surface disc  2043 , a base disc  2041  and a rolling element  2042 . The rolling element  2042  is embedded in the base disc  2041 . For assembly, the base disc  2041  and the surface disc  2043  both have a hole  20412 ,  20431  formed on their centers, corresponding to the other. The surface disc  2043  is encircled with a friction ring  20432 . A rib  2023  is formed in the center of the seat rack  202 , and a hollow rod  2024  is formed on the rib  2023 . The hollow rod can skewer the surface disc  2043  and the base disc  2041  by passing through holes  20412 ,  20431  formed thereon. An outrigger  2025  and a buckle  2026  are formed on one side of the seat rack  202  so as to support the pound-force adjuster  209 . The pound-force adjuster  209  comprises a holder  2091  and an anti-slip belt  2092 . Insert one end of the anti-slip belt  2092  into the holder  2091  and fasten the other end with the buckle  2026  so that the anti-slip belt  2092  can gird the friction ring  20432 . Turn the knob  20911  on the holder  2091  to fasten or loose the anti-slip belt  2092  so as to adjust the pound force of the first rotating disc  204 . An eccentric cylinder  2051  is formed on bottom of the revolution disc  205  and has a bearing  2053  fitted in. Fit the eccentric cylinder  2051  into the hollow rod  2024  so that the revolution disc  205  can make eccentric rotation. Assembly the second rotating disc  206  and the revolution disc  205  by fitting together a plurality of assembly holes  2052 ,  20611  formed thereon. The second rotating disc  206  comprises a surface disc  2063 , a base disc  2061  and a rolling element  2062 . The rolling element  2062  is embedded in the base disc  2061 . The surface disc  2063 , which comprises a hole  20631  formed in the center and a plurality of assembly holes  20632  formed on the surface, is encircled by a friction ring  20633  and installed beneath a seat cushion  207 . 
         [0015]    With reference to  FIG. 3 , which shows assembly of the present invention, the rotatory abdominal crunch machine  20  comprises a support rack  201 , a seat rack  202 , a pound-force adjuster  209 , a first rotating disc  204 , a revolution rotating disc  205  and a second rotating disc  206 . Fasten the seat rack  202  on the support rack  201  with a plurality of knobs  208 . Fit base disc  2041  of the first rotating disc  204  on the support rack  202 . Place the surface disc  2043  on the first rotating disc  204 . Assemble the pound-force adjuster  209 , the seat rack  202  and the surface disc  2043  of first rotating disc  204 . Fit the base disc  2061  of second rotating disc  206  on the revolution disc  205 . Fit the surface disc  2063  beneath the seat cushion  207  and put the base disc  2061  under said surface disc  2063  so as to fit the second rotating disc  206  beneath the seat cushion  207 . Pass the eccentric cylinder  2051 , which is formed on bottom of the revolution disc  205 , through the holes  20412 ,  20431 , which are formed in the center of the first rotating disc  204 . Assembly of the rotatory abdominal crunch machine is thus complete. 
         [0016]    With reference to  FIG. 4 , which shows another embodiment of the present invention, the rotatory abdominal crunch machine  20  comprises a support rack  201 , a seat rack  202 , a pound-force adjuster  209 , a first rotating disc and a second rotating disc. The base disc  2041  comprised in the first rotating disc  204  and the surface disc  2063  comprises in the second rotating disc  206  are identical to those of the foregoing embodiment, shown in  FIG. 3 . Fasten the seat rack  202  on the support rack  201  with a plurality of knobs  208 . Fit the base disc  2041  of first rotating disc  204  on the seat rack  202 . Fit the surface disc  2063  of second rotating disc  206  beneath the seat cushion  207  and cover the base disc  2041  of first rotating disc. Fit together the pound-force adjuster  209 , the seat support  202  and the surface disc  2063  of second rotating disc  206 . Assembly of the rotatory abdominal crunch machine  20  is complete. It can thus swing. 
         [0017]    With reference to  FIG. 5 , which is a sectional view of embodiment I of the present invention, the rotatory abdominal crunch machine assists the user in swinging his or her waist so as to strengthen the abdominal muscles. While doing workout with the machine, the user is to sit on seat cushion  207 , properly grip the handrails  203 , keep his or her legs close and put his or her feet on the ground. 
         [0018]    With reference to  FIG. 6 , which is a sectional view of embodiment II of the present invention, the rotatory abdominal crunch machine assists the user in swinging his or her waist in a circular motion so as to strengthen the abdominal muscles. The circular motion is driven by user&#39;s own force produced from swinging his or her waist as well as eccentric rotation of the revolution disc  205 . While doing workout with the machine, the user is to sit on seat cushion  207 , properly grip the handrails  203 , keep his or her legs close and put his or her feet on the ground. 
         [0019]    With reference to  FIG. 7 , which is a sectional view of embodiment III of the present invention, the rotatory abdominal crunch machine assists the user in swinging his or her waist in a circular motion so as to achieve powerful and tight abdominal muscles. The circular motion is driven by user&#39;s own force produced from swinging his or her waist as well as eccentric rotation of the revolution disc  205 . While doing workout with the machine, the user is to sit on seat cushion  207 , well grip the handrails  203 , keep his or her legs close and lifted up. 
         [0020]    Accordingly, the rotatory abdominal crunch machine is easy for anyone to use for strengthening the abdominal muscles. Besides, it takes not much space for storage. 
         [0021]    While the present invention is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and described in detail herein. However, it should be understood that the invention is not intended to be limited to the particular form disclosed. Rather, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. 
         [0022]    To sum up, the present invention achieves in offering a rotatory abdominal crunch machine that possess the practicability and the advancement of the industry.