Steering apparatus and method of operating the same

1. A steering apparatus comprising:

a pair of plate brackets provided on two sides of an outer tube and including tilt long holes formed in a vertical direction;

a cam unit coupled to an outer side of one plate bracket of the pair of plate brackets to apply a pressure inward; and

an adjusting unit coupled to an outer surface of the cam unit to adjust rotation of the cam unit,

wherein the adjusting unit includes a first spring installed outside the cam unit,

a plunger of which one end is in contact with the first spring and the other end is provided with a push button,

a stopper provided in a hollow shape through which the plunger passes,

a guide pin formed to protrude from an outer circumferential surface of the plunger, and

a guide member provided in a hollow shape through which the plunger passes, fixed to an outer side of the stopper, and including a guide groove in which the guide pin is accommodated, and

the guide groove includes a diagonal groove formed in a diagonal direction so that the guide pin moves to rotate the plunger.

2. The steering apparatus of claim 1 , wherein the guide groove includes a fixing groove formed to extend from an end of the diagonal groove so that the guide pin is fixedly seated in the fixing groove when the plunger stops rotation to allow the cam unit to apply a pressure inward.

3. The steering apparatus of claim 2 , wherein the fixing groove is formed to extend from the end of the diagonal groove in a direction away from the stopper, wherein the direction is different from a direction in which the diagonal groove is formed.

4. The steering apparatus of claim 3 , wherein the guide groove includes a horizontal groove formed to extend from the end of the diagonal groove toward the stopper to be parallel to an axial direction of the plunger.

5. The steering apparatus of claim 2 , wherein an outer diameter of the fixing groove is equal to an outer diameter of the guide pin.

6. The steering apparatus of claim 1 , wherein the plunger includes a support member formed on one end of the plunger in contact with the first spring and having an outer diameter greater than or equal to an outer diameter of the stopper.

7. The steering apparatus of claim 1 , wherein the adjusting unit includes a thrust bearing interposed between the plunger and the cam unit.

8. The steering apparatus of claim 1 , wherein the cam unit includes:

a fixed cam coupled to the outer side of the one plate bracket and including a plurality of first protrusions formed on one surface of the fixed cam; and

an operating cam in which a plurality of second protrusions are formed on one side of the operating cam correspondingly in contact with the first protrusions and the first spring is coupled to the other side of the operating cam.

9. The steering apparatus of claim 8 , wherein:

the adjusting unit includes a thrust bearing interposed between the plunger and the cam unit; and

the thrust bearing includes an opening through which the first spring passes.

10. The steering apparatus of claim 1 , comprising a gear unit coupled to an outer side of another plate bracket of the pair of plate brackets and configured to apply a pressure inward.

11. The steering apparatus of claim 10 , wherein the gear unit includes:

a fixed gear coupled to the outer side of the another plate bracket and including a plurality of first teeth formed on one surface of the fixed gear; and

an operating gear in which a fixing nut is coupled to the operating gear.

12. The steering apparatus of claim 10 , comprising an adjustment bolt which passes through the tilt long holes and of which one end is coupled to the cam unit and the other end is coupled to the gear unit.

13. A method of operating a steering apparatus, which includes a cam unit coupled to an outer side of one plate bracket of a pair of plate brackets and configured to apply a pressure inward and an adjusting unit coupled to an outer surface of the cam unit to adjust rotation of the cam unit, and the adjusting unit includes a first spring installed outside the cam unit and a plunger installed outside the first spring, the method comprising:

pressing the plunger inward by a push button provided on an end of the plunger and moving the plunger inward through a stopper, wherein a guide member is fixed to an outer side of the stopper;

moving a guide pin formed to protrude from an outer circumferential surface of the plunger along a guide groove formed in the guide member from an outer side to an inner side of a diagonal groove formed in a diagonal direction;

rotating the plunger to rotate the cam unit so as to press the pair of plate brackets inward;

pressing the plunger inward by the push button provided on the end and then moving the plunger outward by receiving an elastic force of the first spring;

moving the guide pin along the guide groove from the inside to the outside of the diagonal groove formed in the diagonal direction; and

rotating the plunger to rotate the cam unit to release a pressure of the pair of plate brackets pressed inward.

14. The method of claim 13 , wherein:

the guide groove includes a fixing groove formed to extend from an end of the diagonal groove so that the guide pin is fixedly seated in the fixing groove when the plunger ends rotation to allow the cam unit to apply the pressure inward; and

when the guide pin moves along the guide groove from the outer side to the inner side of the diagonal groove formed in the diagonal direction, the guide pin of which the movement ends is fixedly seated in the fixing groove.

15. The method of claim 14 wherein:

the guide groove includes a horizontal groove formed to extend from the end of the diagonal groove toward the stopper to be parallel to an axial direction of the plunger; and

when the cam unit is rotated to press the pair of plate brackets inward and then pressed to an inside of the plunger by the push button, the guide pin is moved from the fixing groove to at least a part of the horizontal groove and then receives an elastic force of the first spring to move outward.