Abdomen Exerciser

Abstract

An abdomen exerciser includes a main frame and a support frame which is pivotally connected with the main frame. The main frame and the support frame can be placed on the ground stably. The main frame has an inclined section which is pivotally connected with a dual link rod to support a back rest and to link a seat platform. The seat platform is connected with a rotatable seat. The support frame is pivotally connected with a foot frame which is disposed in front of the support frame and confined by a resilient rope or a spring. When the user lies down and sits up, the back rest is returned to the original position by the seat platform and the dual link rod, without using the spring or the resilient rope. The foot frame can be used for leg exercise.

What is claimed is: 
     
         1 . An abdomen exerciser, comprising a main frame and a support frame which is pivotally connected with the main frame, the main frame having an inclined section and comprising a seat platform thereon, the seat platform being connected with a rotatable seat, two sides of a rear end of the seat platform being connected with a pair of grasp rods for a user to grasp thereon when sitting on the seat to swing his/her lower body, the support frame comprising a leg rod at an upper end thereof and a foot rod at a lower end thereof; and characterized in that the abdomen exerciser comprises:
 the seat platform, the seat platform having a front end which is pivotally connected to the main frame through a first shaft, the seat platform comprising a transverse stop rod which is located under the seat platform to straddle on the main frame to keep the seat platform in a level state;   left and right pull rods, front ends of the left and right pull rods being pivotally connected to a rear end of the seat platform through a second shaft, rear ends of the left and right pull rods being pivotally connected to a lower end of a middle post of a back rest through a third shaft;   a support rod, an upper end of the support rod being pivotally connected to a pivot seat provided on a lower end of the back rest through a fourth shaft, a lower end of the support rod being pivotally connected to a fixing seat on the main frame through a fifth shaft;   left and right driving rods, upper ends of the left and right driving rods being pivotally connected to middle sections of the left and right pull rods through a sixth shaft, lower ends of the left and right driving rods being pivotally connected to front ends of left and right driven rods through a seventh shaft;   rear ends of the left and right driven rods being pivotally connected to the inclined section of the main frame through an eighth shaft, the seventh shaft being located under the inclined section of the main frame and having a distance from the inclined section of the main frame;   wherein, the user sits on the seat and leans against the back rest with his/her feet to hold against the foot rod of the foot frame, when the user lies down, the middle post has the fourth shaft of the support rod as a pivot to move the left and right pull rods, upward through the third shaft and the left and right driven rods are also moved upward, the seventh shaft is stopped by the inclined section of the main frame to raise the seat platform, the seat is to raise the hip of the user for the user to stretch his/her waist and back, when the user sits up and the back rest returns to the original position, the seat platform is lowered until the stop rod gets contact with the inclined section of the main frame so that the seat is moved to the level position, the left and right pull rods are pressed downward by the seat platform to link the left and right driving rods to pull the back rest back.   
     
     
         2 . The abdomen exerciser as claimed in  claim 1 , wherein the support frame comprises a first joint at a rear end thereof, the first joint is fitted on the front end of the main frame and connected by a pivot shaft inserting through the front end of the main frame, a lock bolt is vertically inserted in the first joint and the front end of the main frame to position the first joint and the front end of the main frame, when the lock bolt is loosened, the support frame can be bent or detached from the main frame, the main frame can be steadily connected in the first joint or bent for storage through the pivot shaft. 
     
     
         3 . The abdomen exerciser as claimed in  claim 1 , wherein a second joint is provided at a front end of the leg rod, the foot frame is connected to the second joint through a positioning shaft inserting in the second joint and an upper end of the foot frame, the foot rod is transversely connected to a lower end of the foot frame, a first pulley is provided on the foot frame above the foot rod, a second pulley is provided on the support frame corresponding in position to the first pulley, the resilient rope winds around the first pulley and the second pulley, one end of the resilient rope is fixed to a first positioning seat on a front side of the foot frame, another end of the resilient rope is fixed to a second positioning seat on a rear side of the support frame, the foot frame can be turned up and down with the positioning shaft of the second joint as a pivot, cooperating with the elastic rope, for leg exercise. 
     
     
         4 . The abdomen exerciser as claimed in  claim 3 , wherein the second joint of the support frame has a first through hole, the foot frame has a second through hole corresponding to the first through hole, a pin is inserted into the first through hole and the second through hole to position the foot frame in place, when the pin is taken out, the foot frame can be turned up and down for leg exercise.