Patent ID: 8579319

Claim:
A baby buggy comprising a foldable frame, a locking device for locking said frame, wheel assemblies disposed at the bottom of the frame, and a seat set on the frame, wherein the frame comprises: a front wheel bracket ( 1 ) having front wheel rods extending along an anteroposterior direction; a right rear wheel bracket ( 3 ), which is rotatably connected at its upper portion to a rear portion of the front wheel bracket ( 1 ) by a first rotating shaft ( 21 ); a left rear wheel bracket ( 5 ), which is rotatably connected at its upper portion to the rear portion of the front wheel bracket ( 1 ) by a second rotating shaft ( 22 ); a right push rod ( 6 ); a left push rod ( 7 ); a sliding part ( 8 ), which is slidably arranged on the front wheel rods along the anteroposterior direction thereof; a right rear supporting rod ( 9 ), which is rotatably connected at its upper portion to the right push rod ( 6 ) by a seventh rotating shaft ( 27 ), and rotatably connected at its lower portion to the rear portion of the front wheel bracket ( 1 ) by a third rotating shaft ( 23 ); a left rear supporting rod ( 11 ), which is rotatably connected at its upper portion to the left push rod ( 7 ) by an eighth rotating shaft ( 28 ), and rotatably connected at its lower portion to the rear portion of the front wheel bracket ( 1 ) by a fourth rotating shaft ( 24 ); a first driving rod ( 12 ), which is rotatably connected to the sliding part ( 8 ) by a fifth rotating shaft ( 25 ), the first driving rod ( 12 ) being rotatably connected at its upper portion to a lower portion of the right push rod ( 6 ) by a ninth rotating shaft ( 29 ), and rotatably connected at its lower portion to the left rear wheel bracket ( 5 ) by a twelfth rotating shaft ( 32 ); and a second driving rod ( 13 ) which is rotatably connected to the sliding part ( 8 ) by a sixth rotating shaft ( 26 ), the second driving rod ( 13 ) being rotatably connected at its upper portion to a lower portion of the left push rod ( 7 ) by a tenth rotating shaft ( 30 ), and rotatably connected at its lower portion to the right rear wheel bracket ( 3 ) by an eleventh rotating shaft ( 31 ).