Motor vehicles – Special wheel base – Collapsible or knockdown for storage or transport
Reexamination Certificate
2000-08-21
2002-08-27
Johnson, Brian L. (Department: 3618)
Motor vehicles
Special wheel base
Collapsible or knockdown for storage or transport
C180S065100, C180S907000
Reexamination Certificate
active
06439331
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a chassis of an electric walk-substituting car, particularly to one having a front chassis and a rear chassis assembled together and their connecting condition more stable than conventional ones.
Electric walk-substituting car is classified into two kinds, one for medical care and the other for leisure activity. Those for medical care are advantageous for transporting patients, generally having a chassis consisting of a front chassis and a rear chassis assembled together, with its weight being not over 20 Kg. And this regulation is more rigorous in Europe and in America than other regions.
A known conventional chassis of an electric walk-substituting car shown in
FIGS. 8 and 9
includes a front chassis
10
and a rear chassis
20
separable from each other. The front chassis
10
has a support post
101
, a fitting block
102
fixed near a lower end of a rear side, an insert hole
103
bored in the fitting block
102
and a insert rod
104
respectively provided at two sides of the fitting block
102
. Further, a lateral rod
105
is fixed under the support post
101
, having two ends fixed with a first hook
106
with a central hook rod
107
on a rear side.
The rear chassis
20
has a front lateral rod
201
, which has a second hook
202
respectively fixed at two ends, and two insert plates
204
in a middle section, with a insert groove
205
formed in each insert plate
204
. Further, a bottom plate
30
is welded on upper ends of the two insert plates
204
, and a cylinder
302
is welded on the bottom plate
30
and has an lower portion
305
of a pull rod
303
fitted in its interior. A pull handle
304
is fixed on an upper end of the pull rod
303
, and a lower end
306
of the pull rod
303
protrudes out the lower end of the cylinder
302
. Further, a coil spring
307
fits around the lower portion
305
, having an upper end pushing an upper end of the cylinder
302
and a lower end resting on an upper end of the lower end
306
to let the pull rod
303
move up and down. Then the front and the rear chassis
10
and
20
can be assembled easily by means of the lateral rods
105
and
201
hooking each other.
However, the first known conventional chassis of an electric walk-substituting car have the front and the rear chassis assembled together by only three points, unstable and not ideal in assembly of the front and the rear chassis.
Next, a second known conventional chassis of an electric car disclosed in U.S. Pat. No. 5,941,327 shown in
FIG. 10
includes a chassis consisting of a first chassis
40
and a second chassis
50
separable from each other, with each chassis provided with a rotatable wheel
401
,
501
.
The second conventional electric car further has a steering wheel
60
rotatably mounted on the first chassis
40
, connected to the wheel
401
to control it to turn.
An adjustable chair is also disposed on the first chassis
40
in the second conventional electric car.
Further, the first chassis
40
has a post
402
with two ears
403
fixed on an upper end and the second chassis
50
has a connect rod
502
with a hole
503
for an insert pin
80
to protrude and also through the two ears
403
and the hole
503
. The second chassis
50
further has a L-shaped fix means
504
respectively fixed at two front sides for two ends of a pivotal rod
404
of the first chassis
40
to fit in so that the front and the rear chassis
40
and
50
are assembled together.
But the second conventional electric car has a disadvantage that the front and the rear chassis are also assembled together only with three points, unstable, not ideal as the first conventional one.
SUMMARY OF THE INVENTION
The objective of the invention is to offer a chassis of an electric walk-substituting car, which has a front chassis provided with a vertical connect rod and a lateral position rod fixed under the connect rod and having two ends connected to a front portion of the front chassis. A rear chassis is provided to assemble with the front chassis, having a vertical combine rod for a chair to combine with, a combine plate in a front portion, and two flat plates respectively provided at two sides of the combine rod for placing two batteries thereon. A front lateral rod and a rear lateral rod are fixed under the two flat plates and define a hollow aperture between them for the position rod of the first chassis to fit in. And the vertical connect rod fits in a U-shaped connector fixed on an upper end of the combine rod of the second chassis. When a user sits on the chair of the car, the weight of the user and the batteries press down to prevent the front chassis and the rear chassis from separating from each other.
REFERENCES:
patent: 4452327 (1984-06-01), Mowat et al.
patent: 5036938 (1991-08-01), Blount et al.
patent: 5074372 (1991-12-01), Schepis
patent: 5150762 (1992-09-01), Stegeman et al.
patent: 5154251 (1992-10-01), Fought
patent: 5941327 (1999-08-01), Wu
patent: 6129165 (2000-10-01), Schaffner et al.
patent: 6170592 (2001-01-01), Wu
Bottorff Christopher
Rosenberg , Klein & Lee
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