Multi-stage armrest structure

A multistage armrest structure comprising:

• a shaft having one end rotatably coupled to an armrest and a second end;
• a housing attached to the armrest, the housing having a shaft insertion hole, the second end of the shaft passes through the shaft insertion hole and the shaft insertion hole supporting the shaft;
• a pair of brackets fixed to the shaft;
• a ratchet rotatably mounted on a hinge member attached to the pair of brackets;
• a sector gear unit attached to the armrest to rotate together and engaged with the ratchet;
• and
• an elastic member disposed between the bracket and the ratchet, the elastic member applying a rotational directional elastic force to ensure engagement between ratchet gear teeth formed on the ratchet and sector gear teeth formed on the sector gear unit and simultaneously preventing axial movement of the ratchet between the pair of brackets.