Land vehicles – Wheeled – Extensible
Reexamination Certificate
2000-07-05
2001-11-27
Mar, Michael (Department: 3619)
Land vehicles
Wheeled
Extensible
C280S042000, C280S650000, C297S044000
Reexamination Certificate
active
06322098
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a foldable carriage, more particularly to a foldable stroller.
2. Description of the Related Art
FIG. 1
illustrates a conventional foldable stroller
1
that includes a handle portion
11
, a pair of parallel struts
111
connected respectively to two opposite ends of the handle portion
11
, a pair of front legs
13
(only one front leg
13
is shown) provided with front wheels
14
and mounted pivotally and respectively on the struts
111
via a pair of pivot seats
12
, and a pair of rear legs
16
(only one rear leg
16
is shown) provided with rear wheels
17
and mounted pivotally and respectively on the struts
111
via a pair of pivot plates
15
. The pivot seats
12
are mounted pivotally and respectively on the struts
111
via a pair of pivot pins
121
, thereby permitting the front legs
13
to be turnable about the pivot pins
121
to a folded position. A locking unit
18
is mounted on each strut
111
for locking releasably the respective front leg
13
against pivotal movement about the respective pivot pin
121
. Each locking unit
18
includes a transmission link
181
mounted in one of the struts
111
, an actuating member
182
connected to an upper end of the transmission link
181
for moving the transmission link
181
upwardly, a locking piece
183
connected to a lower end of the transmission link
181
and having a locking recess
184
that engages releasably an upper end of the respective front leg
13
, and a compression spring
185
connected to the lower end of the transmission link
181
and a bottom end of the respective strut
111
for urging the locking pieces
183
to engage the upper end of the front leg.
13
. To fold the front legs
13
, the locking pieces
183
are pulled upwardly and simultaneously to disengage the upper ends of the front legs
13
via the transmission links
181
by operating the actuating members
182
on the struts
111
. However, such operation requires the user to use both hands to operate the actuating members
182
simultaneously, which can result in inconvenience to the user in situations, such as when the user is holding an object with one hand.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a foldable carriage that is capable of overcoming the aforementioned problem.
According to the present invention, a foldable carriage comprises: a handle unit including a pair of spaced apart struts having top and bottom ends, a pair of curved handgrips having lower ends respectively pivoted to the top ends of the struts and upper ends which are connected pivotally together, and a manually operable first locking unit connected to the upper ends of the handgrips for locking releasably the handgrips against pivotal movement, the upper ends of the handgrips being turnable relative to one another and the lower ends of the handgrips being turnable relative to the struts when the first locking unit is operated to move to an unlocking position; a pair of foldable wheeled frames each including front and rear legs which respectively have upper ends mounted movably on one of the struts below the handgrips, the wheeled frames being foldable when being moved relative to the struts; a pair of second locking units mounted respectively on the struts for interlocking with the wheeled frames so as to lock the wheeled frames against movement relative to the struts; and a pair of transmission links, each of which includes a lower end connected to one of the second locking units and an upper end connected to the lower end of one of the handgrips for actuating said one of the second lock units to release the respective one of the wheeled frames when the first locking unit is in the unlocking position.
REFERENCES:
patent: 4386790 (1983-06-01), Kassai
patent: 4565388 (1986-01-01), Kassai
patent: 5181735 (1993-01-01), Onishi
patent: 5669623 (1997-09-01), Onishi
patent: 5979928 (1999-11-01), Kuo
patent: 6068284 (2000-05-01), Kakuda
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