Patent ID: 6722690
Filing Date: 2004-04-20
Classification: B62B

Abstract:
A foldable stroller comprising:a front wheel unit including a pair of rearwardly and upwardly inclined left and right lower rods, each of which has an upper end; two positioning members disposed respectively and fixedly on said upper ends of said left and right lower rods, each of said positioning members having an upper end, which is formed with a rearwardly and upwardly inclined planar positioning surface forming an acute angle with respect to a longitudinal direction of said left and right lower rods, and a guiding surface extending generally and downwardly from said upper end of said positioning surface; a handle unit including a grip and a pair of inclined left and right upper rods that are fixed to and that extend respectively, forwardly and downwardly from two opposite ends of said grip, each of said left and right upper rods being parallel to said left and right lower rods and having a lower end; two guideway members disposed respectively and fixedly on said lower ends of said left and right upper rods and connected respectively and pivotally to said positioning members; a rear wheel unit disposed pivotally on said lower ends of said left and right upper rods and located behind said front wheel unit; a link for interconnecting pivotally said front and rear wheel units; and a pair of left and right control mechanisms, each of which includes a sliding element disposed slidably within a respective one of said guideway members and guided to move in the longitudinal direction of said left and right lower rods, said sliding element being formed with a planar abutment surface that engages said positioning surface of a respective one of said positioning members and that has a lower end, and an engaging surface that extends generally and upwardly from said lower end of said abutment surface, said abutment surface and said engaging surface defining a tip of said sliding element therebetween, a resilient element for biasing said abutment surface of said sliding element to engage said positioning surface of the respective one of said positioning members, thereby preventing rotation of said left and right upper rods relative to said left and right lower rods, an actuator element disposed operably on said handle unit, and an elongated connecting element having an upper end that is fastened to said actuator element, and a lower end that is fastened to said sliding element so that actuation of said actuator element results in separation of said abutment surface of said sliding element from said positioning surface of said positioning member against biasing action of said resilient element, thereby permitting folding of both said handle unit and said rear wheel unit on said front wheel unit, after which said handle unit and said rear wheel unit can be unfolded from said front wheel unit so that said engaging surface of said sliding element slides over said guiding surface of the respective one of said positioning members such that said abutment surface of said sliding element is biased by said resilient element to engage once again said positioning surface of the respective one of said positioning members.