Abstract: A folding joint structure for strollers to control extension, anchoring, release and folding of the stroller frame includes an outer joint and an inner joint coupled to the frame. When the frame is extended, the outer joint covers the inner joint so that there is no gap formed therebetween when the handle tube of the frame is pushed downwards. Therefore injury to the baby's hands may be prevented and wobbling of the joint assembly may be reduced.

Abstract: A positioning mechanism is comprised of a first member having a plurality of notches, a second member having a hole that can slide within the first member, and an engagement member provided in the second member having a latched member and a flexible member, wherein the latched member is passed through the hole of the second member to engage with one of the notches of the first member in a locked position. When the engagement member is activated to compress the flexible member, which in turn moves the latched member inward, the latched member moves from the notch of the first member and the hole of the second member, thus unlocking the second member. By utilizing this, a relative positioning of telescopic members is achieved.

Abstract: A seat is configured to comprise a plurality of notches on the arm of seat portion and two shaped shrouds of backrest each covered on the arm. Whereby raising the shrouds will cause the shrouds to disengage from the notches so as to freely move above along the notches and release of the shrouds will cause the shrouds to move downward to engage with the notches. By utilizing this, an angle adjustment of backrest with respect to seat portion is effected.

Abstract: A detachable seat comprises a movable curve member capable of being in a first position when curve member is extended away from the seat to serve as footrest or a second position when curve member is beneath seat such that curve member and seat together are supported on the ground to serve as an independent chair.