Land vehicles – Wheeled – Extensible
Reexamination Certificate
2000-06-14
2001-11-27
Mai, Lanna (Department: 3619)
Land vehicles
Wheeled
Extensible
C280S047400, C280S047410, C297S370000
Reexamination Certificate
active
06322097
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a stroller, more particularly to a stroller with an adjustable backrest.
2. Description of the Related Art
A stroller normally includes a stroller frame with front and rear legs and a seat frame, an adjustable backrest mounted pivotally on the stroller frame for turning relative to the stroller frame toward and away from the seat frame, a positioning unit including a pair of swingable pieces that engage releasably the backrest for positioning selectively the backrest at one of inclined positions relative to the seat frame, and a releasing unit including a pulling member and a pair of pushing members that are connected to the pulling member and that engage releasably the swingable pieces when pulled by the pulling member for disengaging the swingable pieces from the backrest so as to permit the backrest to turn to a desired inclined position relative to the seat frame. Conventionally, the pulling member is constructed by using either a set of metal rods, which are joined together, or a string unit in order to perform the disengagement of the swingable pieces from the backrest. However, such pulling member is disadvantageous in that when metal rods are used, the total weight of the stroller will be increased considerably so that the stroller is inconvenient to carry, and when a string unit is used, the structure of the pulling member will be relatively complex so that adjustment of the backrest to a desired inclined position is not easy.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a stroller with a pulling member that is capable of overcoming the aforementioned problems.
According to the present invention, a stroller comprises: a stroller frame having front and rear legs and a seat frame secured to the front and rear legs; a backrest having left and right supporters mounted pivotally and respectively on two opposite sides of the seat frame adjacent to the rear legs for turning upwardly and rearwardly relative to the stroller frame away from the seat frame, and downwardly and forwardly relative to the stroller frame toward the seat frame; left and right positioning members respectively having left and right swingable pieces, and left and right locking protrusions, the left and right swingable pieces being mounted pivotally and respectively on two opposite sides of the stroller frame adjacent to the left and right supporters of the backrest, respectively, and having respectively left and right bottom edges formed with a plurality of spaced apart and aligned locking grooves which open downwardly, the left and right locking protrusions projecting respectively from the left and right supporters to engage selectively and releasably one of the locking grooves in the left and right bottom edges for positioning the backrest, the left and right swingable pieces being rotatable relative to the stroller frame so as to move upwardly and rearwardly to an unlocking position for disengaging the locking grooves in the left and right bottom edges from the left and right locking protrusions, and to move downwardly and forwardly to a locking position for engaging the locking grooves in the left and right bottom edges and the left and right locking protrusions; and a releasing unit including a pulling member mounted movably on the backrest between the left and right supporters for moving upwardly and downwardly relative to the backrest, left and right pushing members mounted movably and respectively on the left and right supporters for moving the left and right swingable pieces of the left and right positioning members to the unlocking position, and left and right urging members that urge respectively the left and right pushing members to move away from the left and right swingable pieces, the pulling member including a vertically extending rigid rod member mounted movably on the backrest between the left and right supporters, a connecting block that is connected to a lower end of the rod member and that has a through-hole, and a flexible single string passing through the through-hole in the connecting block and extending sidewisely from the through-hole to be connected to the left and right pushing members.
REFERENCES:
patent: 4915401 (1990-04-01), Severson et al.
patent: 4986564 (1991-01-01), Liu
patent: 5806877 (1998-09-01), Huang
patent: 5988670 (1999-11-01), Song et al.
patent: 6086086 (2000-07-01), Hanson et al.
Buchanan Christopher
Mai Lanna
LandOfFree
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