Stroller frame

A stroller frame comprising:

• a seat pan;
• an operating handle movably coupled to said seat pan;
• and
• two opposite foldable side frame units respectively disposed at opposite lateral sides of said seat pan, each of said side frame units including
• a front leg that is pivotally connected to said seat pan at a pivot point,
• a handle rod that has a pivot end portion pivotally connected to said front leg,
• a rear leg that has a top end pivotally connected to said handle rod, and a bottom end opposite to said top end,
• a bottom leg that has a lower end pivotally connected to said bottom end of said rear leg, and an upper end opposite to said lower end, and
• a sliding basket tube that is slidably connected to said rear leg and movably coupled to said seat pan;
• wherein said stroller frame is operable to a folded state, where a projection of said operating handle on an imaginary horizontal plane is located between a line defined between projections of said top ends of said rear legs on the imaginary horizontal plane and a line defined between projections of said upper ends of said bottom legs on the imaginary horizontal plane;
• wherein, to unfold said stroller frame, said operating handle is pushed downward to drive said seat pan to pivot downward relative to said front leg of each of said side frame units, so that an angle between said front leg and said bottom leg of each of said side frame units increases until said stroller frame is converted from the folded state to an unfolded state, said sliding basket tube sliding relative to said rear leg during conversion of said stroller frame between the unfolded state and the folded state.

The stroller frame as claimed in claim l6, wherein:

• each of said guide slots is arc-shaped, and has opposite first and second slot end portions that are respectively proximate to and distal from said pivot point of a respective one of said side frame units;
• when said stroller frame is converted from the folded state to the unfolded state, said seat pan is pivoted relative to said front leg of each of said side frame units in a first direction while said protruding portion of said sliding basket tube of each of said side frame units slides from said second slot end portion to said first slot end portion of the respective one of said guide slots in a second direction which is opposite to the first direction;
• and
• when said stroller frame is in the unfolded state, said sliding basket tube of each of said side frame units extends substantially parallel to said seat pan and supports said seat pan.