Land vehicles – Wheeled – Running gear
Reexamination Certificate
2002-06-04
2003-12-02
Jordan, Charles T. (Department: 3649)
Land vehicles
Wheeled
Running gear
C180S065100, C180S311000, C180S907000, C180S908000
Reexamination Certificate
active
06655717
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an electric cart, and more particularly an electric cart, of which the frame is constructed such that the rear wheels will vibrate within reduced range when the cart is moving along an uneven ground.
Referring to
FIGS. 4 and 5
, a frame of a conventional electric cart includes a front part
10
, and a rear part
20
. The front part
10
has a base, a seat support rod
101
, two bent support rods
104
, and a head tube
105
; the bent support rods
104
are fixed to the front of the base; the head tube
105
is fixedly connected to the bent rods
104
at a lower end, and connected to a handle bar of the cart at an upper end; front wheels
106
are fitted to two sides of the front end of the base; the seat support rod
101
sticks upright form an rear end of the base with bent supplement rods
1011
helping same secured in position that are connected to lateral sides of the rod
101
as well as edges of the base. A seat
102
is connected to the upper end of the support rod
101
. The front part
10
further has a pair of holed pivotal portions
103
at two lateral sides of the rear portion of the base. The rear part
20
has rear wheels
201
fitted to two lateral sides of a rear portion of a base
203
thereof; each of the wheels
201
is provided with a shock absorber
202
. The rear part
20
is fitted to the front part
10
with an upper front portion being fixed to the rod
101
, and with a front portion of the base
203
being pivoted to the pivotal portions
103
. Thus, referring to
FIG. 6
, the shock absorber
202
can help reduce discomfort of the rider when the cart is ridden along an uneven ground.
However, the cart is found to have disadvantages as followings:
1. Because the pivotal portions
103
are formed at the rear end of the front part
10
exactly beside the seat support rod
101
, the distance H
1
from the pivotal portions
103
to the hubs of the corresponding wheels
201
is relatively short. Consequently, when one rides the cart on an uneven ground, the rear wheels
201
are prone to vibrate up and down for such a long distance that the rider would feel very uncomfortable.
2. The head tube
105
is only held in position with two rods
104
. therefore the position thereof is prone to change when it hits objects, causing injure of the rider. And, the bent support rods
104
are in no position to protect the lower portions of the legs of the rider due to the position and shape thereof.
3. The seat support rod
101
is provided with the supplement rods
1011
that can only prevent it from moving sideways, therefore it is not held in position ideally, i.e. at all of the sides.
SUMMARY OF THE INVENTION
Therefore, it is a main object of the present invention to provide an electric cart, which is constricted such that the rear wheels will vibrate within relatively small range when the cart is moving along an uneven ground.
It is another object of the present invention to provide an electric cart, which has a front section capable of protecting the lower portions of the rider's legs if the cart collides with other objects.
It is yet another object of the present invention to provide an electric cart, which is constructed such that a support rod for the seat is held in position with increased firmness.
REFERENCES:
patent: 4633962 (1987-01-01), Cox et al.
patent: 4947955 (1990-08-01), Hopely, Jr.
patent: 5036938 (1991-08-01), Blount et al.
patent: 5145020 (1992-09-01), Quintile et al.
patent: 5312126 (1994-05-01), Shortt et al.
patent: 5518081 (1996-05-01), Thibodeau
patent: 5941327 (1999-08-01), Wu
patent: 6056077 (2000-05-01), Kobayashi
patent: 6170592 (2001-01-01), Wu
patent: 6439331 (2002-08-01), Fan
patent: 6565105 (2003-05-01), Lin
Jordan Charles T.
Rosenberg , Klein & Lee
Zerr John W
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