Refrigerator having basket lift device

1. A refrigerator having a basket lift device comprising:

a main body having a refrigerating chamber;

a basket received in the refrigerating chamber;

a driving motor for lifting/lowering the basket; and

a control unit for controlling the driving motor based on a motion of a rotational shaft of the driving motor,

wherein the control unit includes an input unit for receiving a signal used for lifting or lowering the basket, and a relay unit for applying a forward voltage or an inverse voltage to the driving motor according to the signal.

2. The refrigerator of claim 1 , wherein the relay unit is formed as a DPDP relay.

3. The refrigerator of claim 1 , wherein the control unit comprises:

a first sensing unit for stopping the driving motor when the basket is lifted to its maximum; and

a second sensing unit for stopping the driving motor when the basket is lowered to its maximum.

4. The refrigerator of claim 3 , wherein the control unit comprises:

a rotation sensing bar connected at one end of a rotational shaft of the driving motor and rotated integrally with the rotational shaft, and

the first sensing unit is a first switch installed at one side of a rotation locus of the rotation sensing bar and the second sensing unit is a second switch installed at the other side of the rotation locus of the rotation sensing bar.

5. The refrigerator of claim 4 , wherein the first sensing unit further includes a relay connected with the first switch.

6. The refrigerator of claim 4 , wherein the second sensing unit further includes a relay connected with the second switch.

7. The refrigerator of claim 3 , wherein the control unit comprises:

sensing levers connected with one end of the rotational shaft of the driving motor and installed to be spaced apart at a pre-set certain angle according to a rotation direction of the rotational shaft, and

the first sensing unit is a first switch positioned on a rotation locus of sensing levers and installed between the sensing levers, and the second sensing unit is a second switch positioned on the rotation locus of the sensing levers and installed between the sensing levers.

8. The refrigerator of claim 7 , wherein an end portion of the sensing levers include an end portion bent in the direction of the first and second switches.

9. The refrigerator of claim 7 , wherein the first and second switches are installed to point toward the opposite direction.

10. The refrigerator of claim 7 , wherein the first sensing unit further includes a relay connected with the first switch.

11. The refrigerator of claim 7 , wherein the second sensing unit further includes a relay connected with the second switch.

12. The refrigerator of claim 3 , wherein the first sensing unit is a first circular platy switch connected with the rotational shaft of the driving motor and integrally rotated with the rotational shaft.

13. The refrigerator of claim 12 , wherein the first sensing unit further includes a relay connected with the first circular platy switch.

14. The refrigerator of claim 3 , wherein the second sensing unit is a second circular platy switch connected with the rotational shaft of the driving motor and integrally rotated with the rotational shaft.

15. The refrigerator of claim 14 , wherein the second sensing unit further includes a relay connected with the second circular platy switch.

16. A refrigerator having a basket lift device comprising:

a main body having a refrigerating chamber;

an upper refrigerating chamber disposed at an upper portion of the main body and having an upper door;

a lower refrigerating chamber disposed at a lower portion of the main body and having a lower door opened in an forward/backward direction;

a basket disposed at the lower refrigerating chamber;

a driving motor for lifting/lowering the basket; and

a control unit for controlling the driving motor based on a motion of a rotational shaft of the driving motor,

wherein the control unit includes an input unit for receiving a signal used for lifting or lowering the basket, and a relay unit for applying a forward voltage or an inverse voltage to the driving motor according to the signal.

17. The refrigerator of claim 16 , wherein the relay unit is formed as a DPDP relay.

18. The refrigerator of claim 17 , wherein the control unit further comprises:

a first sensing unit for stopping the driving motor when the basket is lifted to its maximum; and

a second sensing unit for stopping the driving motor when the basket is lowered to its maximum.

19. The refrigerator of claim 18 , wherein the control unit comprises:

a rotation sensing bar connected at one end of a rotational shaft of the driving motor and rotated integrally with the rotational shaft, and

the first sensing unit is a first switch installed at one side of a rotation locus of the rotation sensing bar and the second sensing unit is a second switch installed at the other side of the rotation locus of the rotation sensing bar.

20. The refrigerator of claim 19 , wherein the first sensing unit further includes a relay connected with the first switch.

21. The refrigerator of claim 19 , wherein the second sensing unit further includes a relay connected with the second switch.

22. The refrigerator of claim 18 , wherein the control unit comprises:

sensing levers connected with one end of the rotational shaft of the driving motor and installed to be spaced apart at a pre-set certain angle according to a rotation direction of the rotational shaft, and

the first sensing unit is a first switch positioned on a rotation locus of sensing levers and installed between the sensing levers, and the second sensing unit is a second switch positioned on the rotation locus of the sensing levers and installed between the sensing levers.

23. The refrigerator of claim 22 , wherein an end portion of the sensing levers include an end portion bent in the direction of the first and second switches.

24. The refrigerator of claim 22 , wherein the first and second switches are installed to point toward the opposite direction.

25. The refrigerator of claim 22 , wherein the first sensing unit further includes a relay connected with the first switch.

26. The refrigerator of claim 22 , wherein the second sensing unit further includes a relay connected with the second switch.

27. The refrigerator of claim 18 , wherein the first sensing unit is a first circular platy switch connected with the rotational shaft of the driving motor and integrally rotated with the rotational shaft.

28. The refrigerator of claim 27 , wherein the first sensing unit further includes a relay connected with the first circular platy switch.

29. The refrigerator of claim 18 , wherein the second sensing unit is a second circular platy switch connected with the rotational shaft of the driving motor and integrally rotated with the rotational shaft.

30. The refrigerator of claim 29 , wherein the second sensing unit further includes a relay connected with the second circular platy switch.

31. The refrigerator of claim 16 , wherein when the upper door is opened at a pre-set angle or below the pre-set angle, the driving motor is not operated.

32. The refrigerator of claim 16 , further comprising:

an emergency switch for stopping the operation of the driving motor in case of emergency.

33. The refrigerator of claim 16 , further comprising:

one or more drawers positioned inside the lower refrigerating chamber and formed at an upper side of the basket.

34. The refrigerator of claim 33 , wherein when the drawer is opened, the driving motor is not operated.

35. The refrigerator of claim 1 , further comprising:

an emergency switch for stopping the operation of the driving motor in case of emergency.

36. The refrigerator of claim 1 , further comprising:

one or more drawers positioned inside the lower refrigerating chamber and formed at an upper side of the basket.

37. The refrigerator of claim 35 , wherein when the drawer is opened, the driving motor is not operated.