Motor vehicles – Special driving device – Portable track
Reexamination Certificate
2000-08-11
2001-12-04
Dickson, Paul N. (Department: 3618)
Motor vehicles
Special driving device
Portable track
C180S907000, C180S009460, C280SDIG001, C280S005220
Reexamination Certificate
active
06325167
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Technical Field of the Invention
The present invention relates to an electrical wheelchair, and in particular, to an improved structure of an electrical wheelchair which has a simple structure and can be used to climb or down a plurality of steps or on a bumpy road. The wheelchair can move in a stable and horizontal position and provides great comfort to the user.
(b) Brief Description of the Prior Art
Conventional wheelchairs are normally unable to climb up or down a plurality of steps or moves stably and horizontally along a bumpy road. In other words, most of the wheelchairs can only be usefil when the ground is flat without obstacles to the path of the wheelchairs.
In view of the above drawback, it is the main object of the present invention to provide an automatic controlled wheelchair which can move on a bumpy ground and keep horizontal when it climbs up or down a plurality of steps.
SUMMARY OF THE INVENTION
An aspect of the present invention is to provide an improved structure of an electrical wheelchair, wherein the structure of the wheelchair is simple and can automatically control the seat in a horizontal position.
Yet another object of the present invention is to provide an improved structure of an electrical wheelchair, wherein the wheelchair can move in almost all horizontal-directions.
It is another object of the present invention to provide an improved structure of an electrical wheelchair, wherein the user on the seat can be comfortably transported.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
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patent: 4790548 (1988-12-01), Decelles et al.
patent: 5437467 (1995-08-01), Patin
patent: 6158539 (2000-12-01), Isley
patent: 52-44933 (1977-04-01), None
A & J
Dickson Paul N.
Lerner Avraham H.
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