Note: Descriptions are shown in the official language in which they were submitted.
CA 02504392 2005-04-19
TITLE: WHEEL STRUCTURE
BACKGROUND OF TtIE INVENTION
Field of the Invention
This invention relates to a wheel structure applied to playing or
s spouting vehicles such as scooters, tricycles, bicycles, skateboards, roller
skates, training cycles, hand-pulling suitcases, hand carts, shopping carts,
toy carts or balancing wheels, and more particularly to a wheel having
two auxiliary sections at respective sides of a main wheel body to
increase contact surfaces of the wheel with the ground,
1o Description of the Prior Art
Most scooters, tricycles or bicycles for children are mounted with
wheels (B) to a cart {A), as shown in Figure 8, to facilitate movement of
the cart (A). When the cart (A) makes a turn, it is difEcult to control
turning movement because the wheels (B) are small in size. Sometimes
15 the cart (A) may even turnover if the turn is made too wide.
In order to correct the shortcoming, an egg-shapod wheel (C) was
derived, as shown ire Figure 9, to provide the stability when making fume.
The egg-shapad wheel (C) has its center surface (C 1 ) in touch with the
ground constantly. When the cart (A) is turning, due to the centrifugal
z0 force, the cart (A) leans towards one side, and so does the egg-shaped
wheel (C). The egg-shaped wheel (C) will lean with its arc surface (C2)
to get in touch with the ground, as shown in Figure 10, which pravides a
stable position to the cart (A). However, if the turning angle is too big,
the cart (A) still may encounter the possibility of overturning.
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In order to overcome the above-mentioned shortcoming, a wheel (D)
mounted with auxiliary wheels (D1) is derived later, as shown in Figure
11, to support the wheel (D} of the cart in fuming. However, the
auxiliary wheels (D 1 ) increase the cost of manufacture and assembly,
and it easily malfunctions.
SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide a wheel
structure, which provides with more contact surfaces for a cart to get in
touch with the ground and more stable to riders.
io It is another objective of the present invention to pmvide a wheel
structure, which uses less parts to save time in assembly and has less
noise,
It is a fiercer objective of the present invention to provide a wheel
structure, which comprises a main wheel body and auxiliary sections
formed integrally by blowing molding or injection molding. The wheel
is providtd with an outer tire formed in an injection or casting method or
mounted to the wheel, thus it is cost effectiveness ,
BRIEF DESCRIPTION OF TIE DRAWINGS
FIG. 1 is a perspective view of a first embodiment of the present
invention;
FIG. 2 is a front view of the first embodiment of the present invention in '
a riding status;
FIG. 3 is a front view of the first embodiment of the present invention in
a turning status;
FIG. 4 is a front view of a second embodiment of the present invention;
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FIG. 5 is a front view of a third ernbOdirrxnt of the present invention;
FIG. 6 is a front view of a fourth embodiment of the present invention;
FIG. 7 is a cross-sectional view of a fifth embodiment of the present
invention;
FIG. 8 is a side view of a conventional wheel;
FIG. 9 is a front view of another conventional whetl;
FIG. 10 is a front view of FIG. 9 in a fuming status; and
FIG.11 is view of a conventional wheel with auxiliary wheels.
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DETAILBT~ DESCRIPTION OF THE PREFERRED E1V~01~IMENTS
As shown in Figure 1, a first embodiment of the present invention
comprises a wheel ( 1 ) having a main wheel body ( 11 ) at the center
portion for direct contact with the ground. The main wheel body ( 11 )
has its two sides extending to forim a pair of extension sections (12) to
get in touch with the ground when malting turns. Each extension section
12) extends outwardly to form an auxiliary section ( 13). The main
wheel body ( 11 ) of the wheel { 1 ) has a larger outer diameter than the
outtr diameters of the auxiliary sections ( 13) to increase the contact
ZO surfaces with the ground when making turns. The auxiliary sections (13)
are integral to the main wheel body ( 11 ).
To operate the present invention, as shown in Figures 2 and 3, the
wheel (1) is pivotally connected to a cart (A). When the cart {A) is
rolling in a straight direction, the main wheel body { 11 ) of the wheel ( 1 )
~s remains contact with the ground. When the cart {A) makes a turn, due to
the centrifugal force, the wheel (1) will incline with the cart (A), which
makes either extension section (12) touch the ground at this moment.
The auxiliary section (13) is also in touch with the gmund to increase
contact surface between the wheel ( 1 ) and the ground to provide a steady
2o riding status when the fuming angle is too big. .
A second embodiment of the present invention coniprl~s a wheel ( 1 A)
as shown in Figure 4. The wheel ( t A) has a main wheel body ( 11 A) at
the center portion, a pair of extension sections (12A) extending from
respective sides of the main wheel body (1 1A), and a pair of auxiliary
25 sections (13A) coaxially cxttnding from the extension sections (12A),
re$pecdvely. The main whoel body {1 1A) of the wheel (1A) has a larger
outer diameter than the outer diameters of the auxiliary sections (13A).
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The extension suctions (12A} are spacod from the auxiliary suctions
(13A).
A third embodiment of the pncsent invention comprises a wheel ( 1 B),
as shown in FIG. 5. The wheel ( 1 B} corr~prises a main wheel body ( 11 B)
at the center portion to be in touch with the ground when the cart is
rolling. The rnain wheel body ( I 1 B) has its two sides extending
outwardly to farm a pair of extension sections {12B) and a pair of
auxiliary sections (13B) coaxially extending from the extension sections
(12B), respectively. The main wheel body (11B) of the wheel (1B) has a
to larger outer diameter than the outer diameters of the auxiliary sections
(13B}. The extension sections (128) are spaced from the auxiliary
sections ( 13B).
A fourth embodiment of the present invention comprises a wheel ( 1 C),
as shown in Figure. 6. The wheel ( 1 C) comprises a main wheel body
1 s ( 11 C) at the center portion to get in touch with the ground when the
cart
is rolling. The main wheel body (11C) has its two sides extending
outwardly to farm a pair of extension sections (12C) and a pair of
auxiliary sections (13C) eoaxially extending from the extension sections
( 12C), respectively. The main wheel body ( 11 C) of the wheel ( 1 C) has a
2o larger outer diameter than the outer diameters of the auxiliary sections
(13C). The extension sections (12C) are spaced from the auxiliary
sections (13C}.
A fifth embodiment of the present invention comprises a wheel (1D),
as shown in Figure 7. The wheel (1D) comprises a main wheel body
2s ( 11 D) at the center pardon to get in touch with the ground when the cart
is rolling. The main wheel body (11D) has its two sides extending
outwardly to form a pair of extension sections ( 12D) and a pair of
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auxiliary sections (13D) coaxialty extending fmm the extension sections
( 12D), respectively. The main whetl body ( 11 D} of the wheel ( I D) has
a larger outer diameter than the outer diameters of the auxiliary sections
(13D). 1fie extension sections (12D) are spaced from the auxiliary
s sections (13D).
Furthermore, the main wheel body (11D) is provided with an outer tire
(110D) made in a different material. Tide auxiliary sections (13D) are
also provided with outer tires (I30D) made in a different material. Hoth
the outer ties {110D) and (130D) may be formed in an injection or
1o casting method or mounted directly to the wheel. Hoth the outer tires
( 11 OD} and ( I 30D) have larger outer diameters than the outer diameters
of the main. wheel 'body ( 11 D) and the auxiliary sections { 13D).
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