초록 ▼

A stroller includes a seat frame, a backrest with a supporting frame pivoted to the seat frame, and a positioning unit including a positioning seat formed with a first engaging member, a second engaging member mounted movably on the supporting frame and movable between engaging and disengaging posit

A stroller includes a seat frame, a backrest with a supporting frame pivoted to the seat frame, and a positioning unit including a positioning seat formed with a first engaging member, a second engaging member mounted movably on the supporting frame and movable between engaging and disengaging positions, and an urging member for urging the second engaging member to move to the engaging position. The second engaging member presses downwardly against the first engaging member by urging action of the urging member.

대표청구항 ▼

1. A stroller comprising:a leg unit;a seat frame mounted on said leg unit;a backrest including a supporting frame that is pivoted to said seat frame so as to permit rotation of said supporting frame about a first axis; anda positioning unit including an elongated positioning seat with a rear end piv

1. A stroller comprising:a leg unit;a seat frame mounted on said leg unit;a backrest including a supporting frame that is pivoted to said seat frame so as to permit rotation of said supporting frame about a first axis; anda positioning unit including an elongated positioning seat with a rear end pivoted to said leg unit so as to permit rotation of said positioning seat about a second axis that is parallel to said first axis, and a front end section opposite to said rear end and said front end section connected movably to said supporting frame, said positioning unit further including a first engaging member formed on said positioning seat, a second engaging member mounted movably on said supporting frame and disposed above said first engaging member, and an urging member, said second engaging member being movable upwardly and downwardly on said supporting frame between an engaging position, in which said second engaging member engages said first engaging member, and a disengaging position, in which said second engaging member disengages from said first engaging member, said urging member urging said second engaging member to press downwardly against said first engaging member when said second engaging member is positioned at said engaging position. 2. The stroller of claim 1, wherein said positioning seat includes elongated left and right seat rods, each of which has a rear end pivoted to said leg unit, and a front end section that is formed with an elongated first slot, said supporting frame including a pair of hollow left and right supporting rods, each of which is pivoted to said seat frame and extends upwardly therefrom, said positioning unit further including a pair of connecting pins, each of which projects from a respective one of said left and right supporting rods and into said first slot in said front end section of a respective one of said left and right seat rods so as to permit simultaneous rotation of said supporting frame about said first axis and rotation of said positioning seat about said second axis in order to adjust position of said backrest with respect to said seat frame. 3. The stroller of claim 2, wherein said first engaging member includes a pair of engaging plates, each of which is mounted on a respective one of said left and right seat rods and each of which is formed with a plurality of engaging grooves, said second engaging member including a pair of engaging pins, each of which projects from a respective one of said left and right supporting rods to engage a selected one of said engaging grooves and to press downwardly against a respective one of said engaging plates by urging action of said urging member when said second engaging member is positioned at said engaging position. 4. The stroller of claim 3, wherein each of said left and right supporting rods is formed with an elongated second slot, each of said engaging pins extending respectively through said second slots in said left and right supporting rods, said urging member including a pair of coil springs that are respectively mounted in said left and right supporting rods above said engaging pins, said stroller further comprising a releasing member that includes a pair of connecting blocks, each of which is mounted movably in a respective one of said left and right supporting rods between a respective one of said engaging pins and a respective one of said coil springs, each of which is connected to the respective one of said engaging pins, and each of which abuts against the respective one of said coil springs, said releasing member further including a string that is connected to said engaging pins and that is operable to pull upwardly said engaging pins against urging action of said coil springs so as to permit upward movement of said second engaging member to said disengaging position. 5. The stroller of claim 4, wherein said backrest further includes a linkage unit that extends between and that is pivoted to said left and right supporti ng rods and that includes a pair of pivoted first links and a pair of pivoted second links which are respectively pivoted to said first links so as to permit folding of said backrest. 6. The stroller of claim 5, further comprising a bracket mounted on said linkage unit, and an operating lever that is pivoted to said bracket so as to be rotatable about a third axis which is parallel to said first and second axes, and that is connected to said string in such a manner that rotation of said operating lever in a direction away from said bracket results in upward pulling of said second engaging member to said disengaging position.