Upper limb training device

1. An upper limb training device comprising:

at least one first rod;

at least one second rod pivoted to the at least one first rod by a first revolution element such that the at least one first rod is able to rotate relative to the at least one second rod, with at least one of the at least one first rod and the at least one second rod being manipulated by an arm of a user;

at least one third rod pivoted to the at least one second rod by a second revolution element such that the at least one second rod is able to rotate relative to the at least one third rod;

at least one first resilient element, with two ends of the at least one first resilient element respectively connecting with the at least one first rod and the at least one third rod, with the at least one first resilient element providing resistance when the at least one first rod and the at least one second rod rotate relative to the at least one third rod; and

at least one second resilient element, with two ends of the at least one second resilient element respectively connecting with the at least one first rod and the at least one third rod, with the at least one second resilient element providing resistance when the at least one first rod rotates relative to the at least one second rod, wherein the first revolution element is disposed between two connecting points at which the at least one first resilient element and the at least one second resilient element connect with the at least one first rod.

2. The upper limb training device as claimed in claim 1 , further comprising:

at least one fourth rod pivoted to the at least one third rod by a third revolution element such that the at least one third rod is able to rotate relative to the at least one fourth rod; and

at least one third resilient element, with two ends of the at least one third resilient element respectively connecting with the at least one third rod and the at least one fourth rod, with the at least one third resilient element providing resistance when the at least one third rod rotates relative to the at least one fourth rod.

3. The upper limb training device as claimed in claim 1 , wherein a magnitude of the resistance provided by the at least one first resilient element is adjusted by changing a position of the connecting point at which the at least one first resilient element connects with the at least one first rod or the at least one third rod.

4. The upper limb training device as claimed in claim 1 , wherein a magnitude of the resistance provided by the at least one second resilient element is adjusted by changing a position of the connecting point at which the at least one second resilient element connects with the at least one first rod or the at least one third rod.

5. The upper limb training device as claimed in claim 2 , wherein a magnitude of the resistance provided by the at least one third resilient element is adjusted by changing a position of a connecting point at which the at least one third resilient element connects with the at least one third rod or the at least one fourth rod.

6. The upper limb training device as claimed in claim 2 , further comprising a supporting arm, with the supporting arm being pivoted to the at least one fourth rod by a fourth revolution element such that the fourth revolution element is able to rotate relatively to the supporting arm, wherein a rotation axis of the fourth revolution element is substantially perpendicular to a ground.

7. The upper limb training device as claimed in claim 2 , wherein the at least one third rod further comprises at least one resistance adjustment device for adjusting the position of the connecting point at which each of the resilient elements connects with the at least one third rod such that a magnitude of the resistance provided by each of the resilient elements is adjusted.

8. The upper limb training device as claimed in claim 1 , wherein the at least one first rod further comprises a handle portion for a user to grasp to manipulate the first rod.

9. The upper limb training device as claimed in claim 1 , wherein the at least one second rod further comprises a fastening element connecting to the arm of the user to manipulate the second rod.

10. The upper limb training device as claimed in claim 1 , wherein a rotation axis of the first revolution element and a rotation axis of the second revolution element are substantially parallel and are on the same plane.

11. The upper limb training device as claimed in claim 2 , wherein a rotation axis of the second revolution element and a rotation axis of the third revolution element are substantially perpendicular to one another and intersect.

12. The upper limb training device as claimed in claim 2 , wherein the at least one first resilient element, the at least one second resilient element, and the at least one third resilient element are used to maintain a mass balance of the at least one first rod, the at least one second rod, the at least one third rod, and the at least one fourth rod.

13. The upper limb training device as claimed in claim 2 , wherein a magnitude of the resistance provided by the at least one first resilient element is adjusted by changing a position of the connecting point at which the at least one first resilient element connects with the at least one first rod or the at least one third rod.

14. The upper limb training device as claimed in claim 2 , wherein a magnitude of the resistance provided by the at least one second resilient element is adjusted by changing a position of the connecting point at which the at least one second resilient element connects with the at least one first rod or the at least one third rod.

15. The upper limb training device as claimed in claim 2 , wherein a rotation axis of the first revolution element and a rotation axis of the second revolution element are substantially parallel and are on the same plane.

16. The upper limb training device as claimed in claim 8 , wherein the at least one second rod further comprises a fastening element connecting to the arm of the user to manipulate the second rod.