Brakes – To retard rolling of caster
Reexamination Certificate
2001-05-15
2002-05-07
Schwartz, Christopher P. (Department: 3618)
Brakes
To retard rolling of caster
C016S03500D, C188S019000, C188S020000
Reexamination Certificate
active
06382364
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a wheel of a baby walking cart, and particularly to one which can slow down automatically when a baby walks too fast on the walking cart; thus, the baby is protected from falling over or colliding with objects too hard.
Walking carts are used for helping little children to learn to walk, and the wheels of the carts are usually provided with a automatical brake device for stopping the walking carts when the little children have been walking too fast.
Referring to
FIGS. 5 and 6
, a conventional wheel for a baby walking cart has a support member
10
, an elastic member
20
, a slide member
30
and two wheel parts
40
.
The support member
10
is fitted to the lower part of a walking cart, and has an elongated guide hole
101
, an axle
102
, two engaging protrusions
103
and. a receiving hole
104
. The engaging protrusions
103
stick out from two sides of the support member
10
. The receiving hole
104
is formed at a front portion of the support member
10
, and has a confining wall (not numbered).
The wheel parts
40
each has engaging teeth
401
spaced apart on an inner circular surface. And, the slide member
30
has an U shape, and the open end portions each has a through hole
301
.
The wheel parts
40
are disposed on two sides of the support member
10
with the axle
102
being passed through the central holes of the wheel parts
40
, the through holes
301
of the slide member
30
and the elongated hole
101
of the support member
10
; the elastic member
20
is received in the receiving hole
104
, and confined between the confining wall (
FIG. 6
) and the front end of the side member
30
for biasing the sliding member
30
as well as the wheel parts
40
to a front end.
When a baby walks along on the walking cart, the elastic member
20
will act against a force, which results from the forward movement of the cart, and push the slide member
30
as well as the wheel parts
40
rearwards. When the baby walks along too fast on the cart, the force resulting from the forward movement of the cart to push the wheel parts
40
rearwards will be greater than the forward biasing force of the elastic member
20
, and consequently the wheel parts
40
will be forced to move to rear part of the support member
10
to engage the engaging protrusions
103
from the engaging teeth
401
; thus, the walking cart is stopped to prevent the cart from hitting objects too hard.
However, the wheel with automatical brake is found to have a drawback that it will be stopped too abruptly, and the abrupt stop will give a shock to the baby on the cart. And, the cart might even fill over to make the baby get hurt.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a wheel for a baby walking cart, which will slow down automatically but won't stop abruptly when a baby has been walking too fast on the cart.
The wheel for a baby walking cart of the present invention includes a support member, two wheel members, a tube-shaped slide member and an elastic member.
The support member is connected to a lower part of the walking cart, and has an elongated hole. The wheel members are disposed on a respective side of the support member, and turnable on axle passed through the elongated hole.
The tube-shaped slide member is movably disposed in the elongated hole of the support member with the axle being passed therethrough. The elastic member is connected to a rear end of the elongated hole, and a rear part of the slide member from two ends for biasing the slide member as well as the wheel members towards a front end of the elongated hole.
Furthermore, wavy slowing-down portions are formed on an inner circular surface of each of the wheel members; the elastic member acts against a force resulting from a forward movement of the walking cart to force the wheel members to move rearwards for keeping the wavy slowing-down portions of the wheel members off slowing-down rods on two sides of the support member when the walking cart moves along; the force moving the wheel members towards the rear end of the elongated hole when the walking cart moves along too fast, makes the wavy slowing-down portions contact the slowing-down rods of the support member to slow down the walking cart.
Because of the shape of the wavy slowing-down portions, the walking cart can be slowed down gradually to not give a shock to the baby walking with the cart when the cart is moved along too fast.
REFERENCES:
patent: 4669580 (1987-06-01), Neville
patent: 5040641 (1991-08-01), Phillips et al.
patent: 5232071 (1993-08-01), Kawanabe
patent: 5368133 (1994-11-01), Yang
patent: 5371922 (1994-12-01), Chern et al.
patent: 5415252 (1995-05-01), Estkowski
patent: 5465986 (1995-11-01), MacRae
patent: 5632360 (1997-05-01), Melara
patent: 6142261 (2000-11-01), Yang
Jin Sun Gee Plastics Co., Ltd.
Kramer Devon
Rosenberg , Klein & Lee
Schwartz Christopher P.
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