as seen in fig1 - 3 , the present invention includes a stand 1 and a swing mechanism 2 which is fitted on the stand 1 . the swing mechanism 2 is incorporated in a swing mechanism fixed frame 11 of the stand 1 . a cross motion link 3 is connected between each side of the swing mechanism 2 and a pedal swing rod 4 respectively . a cylinder 5 is connected between each pedal swing rod 4 and the stand 1 respectively . one end of each pedal swing rod 4 is fixed in the stand 1 by pins . the swing mechanism 2 is composed of a lever 6 and a u - shaped height adjustment plate 7 . a round rod 61 is incorporated in each end of the lever 6 respectively . the u - shaped height adjustment plate 7 includes a u - shaped plate and a screw secured to the plate . a height adjustment knob 8 is incorporated in the screw . the u - shaped plate of 7 is fitted on lever 6 , and is secured to the lever 6 with a screw 9 . the screw 9 also penetrates both sides of the swing mechanism fixed frame 11 in the stand 1 . an elongated slot 12 is incorporated in each side of the swing mechanism fixed frame 11 respectively . the screw 9 extends through both elongated slots of swing mechanism fixed frame 11 . the screw of the u - shaped plate extends through a top of the swing mechanism fixed frame 11 . the height adjustment knob 8 is then connected with the screw of said u - shaped plate . the round rods 61 on the lever 6 are fitted into one hole of each cross motion link 3 respectively . the cross motion link 3 is a structure having two round holes which overlap each other , but which do not intersect . the other hole of cross motion link 3 is penetrated by a slide bar 41 of the pedal swing rod 4 . the slide bar 41 is fixed on a u - frame which is secured on the said pedal swing rod 4 . by means of the aforementioned structure , while a user steps on the pedal swing rods 4 , the two pedal swing rods 4 will swing up and down . the cylinder 5 will work as a damper . if the swing arc of the two pedal swing rods 4 is to be adjusted , the adjustment can be made by turning the height adjustment knob 8 . through the turning of the height adjustment knob 8 , the lever 6 can be moved up or down by the u - shape height adjustment plate 7 , and the height of said lever 6 can thereby be adjusted . therefore , the swing arc can be adjusted accordingly due to the change of the supporting point of the pedal swing rods . according to the aforementioned structure , a preferred embodiment of the present invention is shown in the figures , when a user is pedaling on the pedal swing rods 4 , a force is applied to either of the two pedal swing rods 4 . therefore , only one of the two pedal swing rods 4 will swing down . the lever 6 will be swung down in the direction of the pedal swing rod 4 to which force is applied , through the connection of one cross motion link 3 . the pedal swing rod 4 will be moved up by the swung - up end of lever 6 , through the connection of other cross motion link 3 . through the damper function of the two cylinders 5 , the two pedal swing rods 4 can swing slowly . as the cross motion link 3 is connected between each of the pedal swing rods 4 and the lever 6 respectively , a stable transmission can be generated to achieve a smooth operation , and the structure can be protected from damage . if a user wishes to perform a minimum amount of exercise , the height adjustment knob 8 can be turned so as to descend the lever 6 to its lowest point . therefore , the swing arc of the pedal swing rods 4 will be reduced accordingly . on the contrary , if a user wishes to perform a more strenuous exercise , the height adjustment knob 8 can be turned in the reverse direction to raise the lever 6 , so that the supporting point of said lever 6 will be higher . therefore , the swing arc of the pedal swing rods 4 will be increased accordingly , so that exercise similar to the actions of stepping up the stairs can be performed . as the integrated design of the present invention is very compact , it can be used in virtually any place , such as a balcony , living room , or bedroom . of course , the present invention can also be used in larger places , such as a courtyard or open space , so that the exercise can be performed at any location . advantageously , the use of the present invention will not be limited by the size of the place ; it is easy to carry and transport because of its compact volume and lighter weight ; and may be conveniently stored . therefore , the major object of the present invention is to provide a swing mechanism 2 which is fitted on the stand 1 . through the turning of the height adjustment knob 8 , the u - shaped height adjustment plate 7 can be raised or lowered , adjusting the height of the supporting point of lever 6 upwardly or downwardly , and the swing arc of pedal swing rods can be adjusted accordingly . the other object of the present invention is to provide a cross motion link 3 which is connected between the lever 6 and the pedal swing rods 4 . therefore , a stable transmission can be generated to achieve a smooth operation , and the structure can be protected from damage . the further object of the present invention is to provide a sporting apparatus with compact volume and lighter weight . therefore the present invention can be used at any place and is easy to carry and store .
a compact pedal exercise apparatus having a stand , a swing mechanism , pedal swing rods , cylinders , and motion link , to form an exercise apparatus with ease of operation . the pedal swing rods are pivotally attached to the stand and each swing rod has a cylinder damper between it and the stand . a movable height adjusting mechanism is interposed between the stand and the pedal swing rods so that a user may easily adjust the amount of movement of each pedal swing rod relative to the stand .