Structure for foldable baby carriage

Structure for foldable baby carriage comprising and characterized by:

• a pair of four bar linkages each having,
• a seat tube,
• a back tube with its lower end connected to a rear portion of the said seat tube and its upper end extending upward,
• an arm rest member with its rear end pivoted to a middle portion of the said back tube and its front end extending forward, and
• a front leg extending downward with its upper end pivoted to the front end of the said arm rest and its middle portion privoted to a front portion of the said seat tube;
• two cross frames, one of them with its upper ends pivoted to the front ends of the seat tubes and the lower ends pivoted to the lower portions of the front legs, and the other with its lower ends pivoted to the rear ends of the seat tubes and its upper ends to the back tubes above said arm rest;
• two rear legs extending downward each with its upper end privoted to the middle portion of the arm rest and its middle portion passing through a sliding sleeve pivoted to the said seat tube between the rear end thereof and the lower end of said back tube;
• and
• two pairs of twin type wheel sets respectively provided under front end rear legs.