Stroller with foldable structure

摘要

A stroller includes an outer frame unit, two support units connected with the outer frame unit, two linking units connected with the outer frame unit and the support units, a cross connection unit mounted between the support units and the linking units, and a positioning and folding unit mounted between the support units. Thus, the positioning and folding unit is operated to expand and collapse the stroller.

主权项

1. A stroller comprising:
an outer frame unit; two support units connected with the outer frame unit; two linking units connected with the outer frame unit and the support units; a cross connection unit mounted between the support units and the linking units; and a positioning and folding unit mounted between the support units;wherein:
each of the support units includes: a connecting piece; a rear leg having a first end mounted on the connecting piece; and a rear wheel mounted on a second end of the rear leg; the connecting piece of each of the support units is provided with two first connecting grooves and a second connecting groove; the outer frame unit includes: an upper frame having two opposite ends each pivotally connected with the respective first connecting groove of each of the support units; a lower frame having two opposite ends each pivotally connected with the respective first connecting groove of each of the support units; a side frame pivotally connected with the upper frame; and a front wheel mounted on the lower frame; each of the linking units includes a connecting block mounted on the rear leg of the respective support unit; an upper curved lever mounted between the connecting block and the upper frame of the outer frame unit; a lower curved lever mounted between the connecting block and the lower frame of the outer frame unit; and a support bar connected with the connecting block; the connecting block of each of the linking units is provided with a mounting hole, two first connecting recesses, a second connecting recess and a connecting portion; the mounting hole of each of the linking units is slidably mounted on the rear leg of the respective support unit; the upper curved lever of each of the linking units has a first end pivotally connected with the respective first connecting recess of the connecting block and a second end pivotally connected with the respective end of the upper frame of the outer frame unit; the lower curved lever of each of the linking units has a first end pivotally connected with the respective first connecting recess of the connecting block and a second end pivotally connected with the respective end of the lower frame of the outer frame unit; the support bar of each of the linking units is connected with the connecting portion of the connecting block; the cross connection unit includes: two oblique levers intersecting each other; and two rotation members each mounted on the respective oblique lever; the rotation members of the cross connection unit are pivotally connected with each other; each of the oblique levers of the cross connection unit has a first end pivotally connected with the second connecting groove of the respective support unit and a second end pivotally connected with the second connecting recess of the respective linking unit; the positioning and folding unit includes a folding base, a compression spring, a control cover, two first pins, a second pin, two folding bars, and two positioning protrusions; the folding base of the positioning and folding unit is provided with a receiving chamber, two elongate slots and a mounting channel; the control cover of the positioning and folding unit is movably mounted on the folding base; each of the first pins of the positioning and folding unit is extended through the control cover and is slidably mounted in the respective elongate slot of the folding base; the second pin of the positioning and folding unit is extended through the control cover and is slidably mounted in the receiving chamber of the folding base; the compression spring of the positioning and folding unit is mounted in the receiving chamber of the folding base and is biased between the folding base and the second pin; each of the folding bars of the positioning and folding unit has a first end pivotally mounted in the mounting channel of the folding base and a second end pivotally connected with the connecting block of the respective linking unit; each of the positioning protrusions of the positioning and folding unit is formed on the first end of the respective folding bar and is provided with a positioning groove and a plurality of engaging teeth; the positioning groove of each of the positioning protrusions is detachably locked onto the respective first pin; and the engaging teeth of the positioning protrusions mesh with each other.