Fixing rod connecting device

1. A fixing rod connecting device comprising:

a main body having an upper surface and a lower surface opposite to the upper surface, and having a pair of space portions formed on both sides of the main body between the upper surface and the lower surface to allow a pair of rods to be inserted thereinto; and

a pair of fixing screws configured to be fastened into the main body through a pair of holes formed on the upper surface of the main body in order to fix the pair of rods,

wherein a first area of the lower surface of the main body is formed to have a predetermined upward inclination angle with respect to an opposite side a second area of the lower surface of the main body, the first area of the lower surface being extended from a first edge of the lower surface and the second area of the lower surface being extended from a second edge of the lower surface, the first edge and the second edge of the lower surface being positioned opposite to each other,

wherein a first area of the upper surface of the main body is formed to have a predetermined upward inclination angle with respect to a second area of the upper surface of the main body, the first area of the upper surface being extended from a first edge of the upper surface and the second area of the upper surface being extended from a second edge of the upper surface, the first edge and the second edge of the upper surface being positioned opposite to each other, and

wherein, when the pair of fixing screws are fastened into the main body, axes passing through centers of the pair of fixing screws and extending from tips of the pair of fixing screws toward tops of the pair of fixing screws intersect to form an angle less than 90° therebetween.

2. The fixing rod connecting device according to claim 1 , wherein the main body is integrally formed, and

wherein, when the pair of rods are inserted into the pair of space portions, the pair of rods are disposed at different heights from each other with respect to a lower end portion of the main body.

3. The fixing rod connecting device according to claim 1 , wherein one of the axes passing through the centers of the pair of fixing screws fastened into the main body and a lower end portion of the main body form an insertion angle of 90° or less therebetween.

4. The fixing rod connecting device according to claim 1 ,

wherein the pair of space portions includes a receiving portion formed in at least one side of the main body to surround an outer circumferential surface of the rod inserted thereinto, and

wherein the fixing rod connecting device further comprises a chuck configured to be inserted into the receiving portion, the chuck being disposed between the outer circumferential surface of the rod and an inner circumferential surface of the receiving portion.

5. The fixing rod connecting device according to claim 4 , wherein the chuck has a plurality of slits formed in a circumferential surface thereof so as to be elastically deformed.

6. The fixing rod connecting device according to claim 5 , wherein some of the plurality of slits formed in the circumferential surface of the chuck extend from an upper end of the chuck toward a center of the chuck, and remaining ones of the plurality of slits extend from a lower end of the chuck toward the center of the chuck.

7. The fixing rod connecting device according to claim 6 , wherein the slits extending from the upper end of the chuck to the center of the chuck and the slits extending from the lower end of the chuck to the center of the chuck are alternately arranged along the circumferential surface of the chuck.

8. The fixing rod connecting device according to claim 4 , wherein the chuck comprises restraining portions protruding from both ends thereof, and

wherein the restraining portions are held in contact with the inner circumferential surface of the receiving portion.

9. The fixing rod connecting device according to claim 1 , wherein each of the pair of fixing screws has a tapered shape or a round shape in which a diameter of the fixing screw gradually decreases toward a distal end of the fixing screw so as to contact an outer circumferential surface of the rod fixed by each of the pair of fixing screws.

10. The fixing rod connecting device according to claim 1 ,

wherein the pair of space portions are formed to be open, and each of the pair of space portions having an open part through which a part of an outer circumferential surface of the rod inserted thereinto is exposed to an outside.

11. The fixing rod connecting device according to claim 1 ,

wherein one of the pair of space portions is formed to be open and has an open part through which a part of an outer circumferential surface of the rod inserted thereinto is exposed to an outside, and the other one of the pair of space portions is formed to be closed so as to surround an outer circumferential surface of the rod inserted thereinto.

12. The fixing rod connecting device according to claim 1 ,

wherein the pair of space portions are formed to be closed so as to surround outer circumferential surfaces of the pair of rods inserted thereinto.

13. The fixing rod connecting device according to claim 12 , wherein, when each of the space portions is formed to be closed for surrounding an outer circumferential surface of the rod inserted thereinto, a chuck is disposed between the outer circumferential surface of the rod inserted thereinto and an inner circumferential surface of the closed space portion.

14. The fixing rod connecting device according to claim 12 , wherein, when each of the space portions is formed to be closed for surrounding an outer circumferential surface of the rod inserted thereinto, the fixing screw fastened for the rod inserted into the closed space portion is configured not to expose a distal end of the fixing screw to an outside from the closed space portion.