Telescopic column for x-ray imaging apparatus

2:

• The telescopic column of claim 1, wherein the weight compensator comprises:
• a first fixed pulley arranged on the main column;
• a movable pulley arranged to be lifted and lowered with respect to the first fixed pulley;
• a first wire having one end coupled to the main column and an opposite end coupled to the sub-column via the movable pulley and the first fixed pulley;
• a cam unit arranged to rotate in connection with the lifting and lowering of the movable pulley;
• and
• the elastic member arranged to extend and contract in connection with the rotation of the cam unit to provide elastic force to the sub-column.

3:

• The telescopic column of claim 1, wherein the sub-column comprises:
• a first sub-column liftably arranged on one side of the main column;
• and
• a second sub-column liftably arranged on one side of the first sub-column.

4:

• The telescopic column of claim 3, further comprises:
• an interlocking mechanism configured to lift and lower the second sub-column in connection with lifting and lowering of the first sub-column,
• wherein the interlocking mechanism comprises:
• a second fixing pulley arranged at an upper end of the first sub-column;
• and
• a fourth wire having one end coupled to the main column and an opposite end coupled to the second sub-column via the second fixing pulley.

5:

• A telescopic column for an X-ray imaging apparatus, the telescopic column comprising:
• a main column;
• a sub-column liftably arranged on one side of the main column;
• and
• a weight compensator arranged on an opposite side of the main column to compensate for a weight of the sub-column,
• wherein the weight compensator comprises:
• a first fixed pulley arranged on the main column;
• a movable pulley arranged to be lifted and lowered with respect to the first fixed pulley;
• a first wire having one end coupled to the main column and an opposite end coupled to the sub-column via the movable pulley and the first fixed pulley;
• a cam unit arranged to rotate in connection with the lifting and lowering of the movable pulley;
• an elastic member arranged to extend and contract in connection with rotation of the cam unit to provide elastic force to the sub-column;
• a second wire having one end coupled to one side of the movable pulley and an opposite end wound on one side of the cam unit;
• and
• a third wire having one end coupled to the elastic member and an opposite end wound on an opposite side of the cam unit.

6:

• The telescopic column of claim 5, wherein the cam unit comprises:
• a cam formed such that a radius of winding of the second wire therearoud changes when the cam rotates;
• and
• a cam pulley arranged on one side of the cam to rotate integrally with the cam, the third wire being wound around the cam pulley.

9:

• The telescopic column of claim 8, wherein the sub-column comprises:
• a first sub-column liftably arranged on one side of the main column;
• and
• a second sub-column liftably arranged on one side of the first sub-column,
• the telescopic column further comprising:
• an interlocking mechanism configured to lift and lower the second sub-column in connection with lifting and lowering of the first sub-column,
• wherein the interlocking mechanism comprises:
• a fourth fixing pulley arranged at an upper end of the first sub-column;
• and
• a fourth wire having one end coupled to the one side of the main column and an opposite end coupled to one side of the second sub-column via the fourth fixing pulley.

10:

• A telescopic column for an X-ray imaging apparatus, the telescopic column comprising:
• a main column;
• a sub-column liftably arranged on one side of the main column;
• and
• a weight compensator arranged on an opposite side of the main column to compensate for a weight of the sub-column,
• wherein the sub-column comprises:
• a first sub-column liftably arranged on one side of the main column;
• and
• a second sub-column liftably arranged on one side of the first sub-column,
• wherein the weight compensator comprises:
• a first fixed pulley arranged on a lower portion of the main column;
• a movable pulley arranged above the first fixed pulley to be lifted and lowered with respect to the first fixed pulley;
• a first wire having one end coupled to the main column and an opposite end coupled to the sub-column via the movable pulley and the first fixed pulley;
• a cam arranged to rotate in connection with the lifting and lowering of the movable pulley;
• a pair of cam pulleys arranged on both sides of the cam to rotate integrally with the cam;
• a second wire having one end coupled to one side of the movable pulley and an opposite end wound around the cam;
• an elastic member arranged to extend and contract in connection with rotation of the cam pulley;
• a third wire having one end wound around the cam pulley and an opposite end coupled to the elastic member;
• a second fixed pulley rotatably arranged at an upper end of the first sub-column;
• and
• a fourth wire having one end coupled to the second sub-column and an opposite end coupled to the main column via the second fixed pulley.