Supporting device

1. A supporting device for supporting a display on a working surface, the supporting device comprising:

a base, being disposed on the working surface;

an upright, being disposed on the base;

a holder, for supporting the display, slidably abutting against the upright;

a diverting structure, including a first diverting element and a second diverting element, the first diverting element being disposed on the upright and the second diverting element being disposed on the holder in which the first diverting element is a fixed pulley and the second diverting element is a movable pulley;

a counter-weight module, slidably abutting against the upright; and

a connecting element, partially winding up the first diverting element and including a first end connecting to one of the upright and the holder, and a second end connecting to the counter-weight module;

wherein when an external force is applied to move the display relative to the upright, the connecting element is driven to make the counter-weight module move simultaneously, and the display is able to stop relative to the upright at any position when the external force is removed.

2. The supporting device of claim 1 , wherein the connecting element is sequentially and partially winding up the first diverting element and the second diverting element, the first end is fixed to the upright, and the second end is connected to the counter-weight module.

3. The supporting device of claim 2 , wherein one-half of the sum of the weights of the display and the holder is equal to the weight of the counter-weight module, and a first stroke of the holder along the upright is equal to one-half of a second stroke of the counter-weight module along the upright.

4. The supporting device of claim 3 , wherein the connecting element has a connecting section located between the first diverting element and the counter-weight module, and the tensile force of the connecting section is one-half of the sum of the weight of the display and the weight of the holder.

5. The supporting device of claim 1 , wherein the diverting structure further includes a third diverting element, wherein the third diverting element is disposed on the upright, and the connecting element is sequentially and partially winding up the first diverting element, the second diverting element, and the third diverting element, the first end is fixed to the holder, and the second end is connected to the counter-weight module.

6. The supporting device of claim 5 , wherein one-third of a sum of the weights of the display and the holder is equal to the weight of the counter-weight module, and a first stroke of the holder along the upright is equal to one-third of a second stroke of the counter-weight module along the upright.

7. The supporting device of claim 6 , wherein the connecting element has a connecting section located between the first diverting element and the counter-weight module, and the tensile force of the connecting section is one-third of the sum of the weight of the display and the weight of the holder.

8. The supporting device of claim 7 , wherein the third diverting element is a fixed pulley.

9. The supporting device of claim 1 , wherein the diverting structure includes a third diverting element, and a fourth diverting element, in which the fourth diverting element is disposed on the holder, and the third diverting element is disposed on the upright, wherein the connecting element is sequentially and partially winding up the first diverting element, the second diverting element, the third diverting element, and the fourth diverting element, the first end is fixed to the upright, and the second end is connected to the counter-weight module.

10. The supporting device of claim 9 , wherein one-quarter of the sum of the weights of the display and the holder is equal to the weight of the counter-weight module, and a first stroke of the holder along the upright is equal to one-quarter of a second stroke of the counter-weight module along the upright.

11. The supporting device of claim 10 , wherein the connecting element has a connecting section located between the first diverting element and the counter-weight module, and the tensile force of the connecting section is one-quarter of the sum of the weight of the display and the weight of the holder.

12. The supporting device of claim 11 , wherein the fourth diverting element is a movable pulleys, and the third diverting element is a fixed pulley.

13. The supporting device of claim 1 , wherein the upright includes a first sliding groove and a second sliding groove; the holder includes a sliding element; the counter-weight module includes a weight-bearing element and a counter-weight unit; a plurality of first followers of the sliding element and a plurality of second followers of the weight-bearing element are respectively disposed in the first sliding groove and the second sliding groove; the weight-bearing element is connected to the connecting element and disposed between the upright and the counter-weight unit; and when the holder and the counter-weight module move relative to the upright, the first followers slide in the first sliding groove and generate a frictional force, and the second followers slide in the second sliding groove and generate another frictional force.