Land vehicles – Wheeled – Stable vehicles – handle-propelled
Reexamination Certificate
2003-02-03
2004-12-14
Phan, Hau (Department: 3618)
Land vehicles
Wheeled
Stable vehicles, handle-propelled
C280S642000, C280S047410, C297S354120
Reexamination Certificate
active
06830254
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
FIGS. 1
to
3
illustrate a conventional stroller
1
that includes a leg unit with front and rear legs
111
,
112
, a seat frame
113
pivoted to the front and rear legs
111
,
112
, a backrest
12
with left and right supporting rods
121
pivoted to the seat frame
113
, and a positioning unit. The positioning unit includes a pair of engaging pins
131
and a pair of positioning seats
13
, each of which is pivoted to a respective one of the rear legs
112
, and each of which is formed with a plurality of engaging grooves
135
. Each of the engaging pins
131
projects from a respective one of the left and right supporting rods
121
to engage releasably a selected one of the engaging grooves
135
in a respective one of the positioning seats
13
. Each of the positioning seats
13
is rotatable upwardly and downwardly between an engaging position, in which the respective engaging pin
131
engages the selected one of the engaging grooves
135
, and a disengaging position, in which the respective engaging pin
131
disengages from the selected one of the engaging grooves
135
. A releasing member
14
includes a pair of pushing members
146
, each of which is mounted slidably on a respective one of the left and right supporting rods
121
, and each of which-contacts a bottom side of a respective one of the positioning seats
13
, a pair of urging members
145
, each of which is mounted in a respective one of the left and right supporting rods
121
above a respective one of the pushing members
146
and each of which is connected to the respective one of the pushing members
146
, and a handle
141
with a string
143
connected to the pushing members
146
in such a manner that pulling of the handle
141
results in upward movement of the pushing members
146
against urging action of the urging members
145
, which, in turn, results in upward movement of the positioning seats
13
to the disengaging position, thereby permitting adjustment of the backrest
12
to a desired position. Each positioning seat
13
is restored to the engaging position by virtue of gravity upon being released from the pulling action of the handle
141
.
The conventional stroller
1
is disadvantageous in that, since each positioning seat
13
is simply laid on the respective engaging pin
131
at the engaging position by gravity, the same tends to disengage undesirably from the respective engaging pin
131
. Moreover, a longer travelling distance of the handle
141
and a greater pulling force are required to adjust the position of the backrest
12
when the latter is disposed at a lower position.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a stroller that is capable of overcoming the aforementioned drawbacks of the prior art.
According to the present invention, a stroller comprises: a leg unit; a seat frame mounted on the leg unit; a backrest including a supporting frame that is pivoted to the seat frame so as to permit rotation of the supporting frame about a first axis; and a positioning unit including an elongated positioning seat with a rear end pivoted to the leg unit so as to permit rotation of the positioning seat about a second axis that is parallel to the first axis, and a front end section opposite to the rear end and connected movably to the supporting frame. The positioning unit further includes a first engaging member formed on the positioning seat, a second engaging member mounted movably on the supporting frame and disposed above the first engaging member, and an urging member. The second engaging member is movable upwardly and downwardly on the supporting frame between an engaging position, in which the second engaging member engages the first engaging member, and a disengaging position, in which the second engaging member disengages from the first engaging member. The urging member urges the second engaging member to press downwardly against the first engaging member when the second engaging member is positioned at the engaging position.
REFERENCES:
patent: 4805928 (1989-02-01), Nakao et al.
patent: 5240265 (1993-08-01), Huang
patent: 5622377 (1997-04-01), Shamie
patent: 5669625 (1997-09-01), Jane Cabagnero
patent: 5687985 (1997-11-01), Sack
patent: 5806877 (1998-09-01), Huang
patent: 5833261 (1998-11-01), Brown et al.
patent: 6322097 (2001-11-01), Lan
patent: 6361056 (2002-03-01), Chen et al.
Baker & Botts L.L.P.
Phan Hau
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