Chairs and seats – Having detachably interfitting parts or components; i.e.,... – Interfitted bottom and bottom frame
Reexamination Certificate
2003-12-02
2004-11-09
Cuomo, Peter M. (Department: 3636)
Chairs and seats
Having detachably interfitting parts or components; i.e.,...
Interfitted bottom and bottom frame
C297SDIG004
Reexamination Certificate
active
06814411
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric wheelchair, more particularly one whose seat is stable, and convenient to use.
2. Brief Description of the Prior Art
Referring to
FIG. 7
, a conventional electric wheelchair includes a main body
3
, and a seat
4
. The main body
3
is comprised of a frame
31
, wheels
32
fitted to the frame
31
, a shell (not shown) arranged around the frame
31
, a transverse board
33
secured to the frame
31
, an upright tube
35
projecting from the transverse board
33
, and a straight rod
36
securely inserted in the upright tube
35
. The seat
4
has a fitting post
41
projecting downwards virtually from a middle of a lower side thereof. A holding room
34
is provided in the frame
31
for holding a power supplying mechanism (not shown) therein. The straight rod
36
has an adjustment disk (not numbered), and an upright fitting hole
361
, which has a slightly larger diameter than the fitting post
41
of the seat
4
.
The fitting post
41
is inserted in the fitting hole
361
of the straight rod
36
for the seat
4
to be supported in position. However, the electric wheelchair is found to have the followings disadvantages:
1. In order for the seat
4
to be removable from the main body
3
, there has to be a small space between the fitting post
41
and the straight rod
36
when the post
41
is inserted in the fitting hole
361
. Consequently, the fitting post
41
and the fitting hole
361
are not co-axial, and the seat
4
is prone to shake when one is ridding on the wheelchair. Furthermore, the seat
4
is not stable and unsafe to use because it is only supported at the middle.
2. The seat
4
and the main body
3
have to be first separated such that the wheelchair can be transported with a car. Because of the fitting post
41
, the seat
4
can't be put in a stable position lower side down when it is separate from the main body
3
. Consequently, when the wheelchair is transported with a car, the seat
4
is prone to move around to get damaged, cause danger or damage to other objects in the trunk.
SUMMARY OF THE INVENTION
It is a main object of the present invention to provide an electric wheelchair whose seat is stable, and convenient to use.
The wheelchair of the present invention includes a frame, and a seat. The frame has front and rear upright support rods, locating parts secured to tops of the front support rods, and fitting parts secured to tops of the rear support rods. Each locating part has opposing guide trenches while each fitting part has lateral portions formed with opposing holes. The seat has front engaging elements, and rear fitting elements secured to the lower side thereof. Each engaging element has a slide rod while each fitting element has opposing holes on lateral portions thereof. The seat is detachably secured to the frame by means of passing pins through the holes of the fitting parts and the fitting elements after the slide rods are passed into the guide trenches, and after the holes of the fitting elements are aligned with the holes of the fitting parts.
REFERENCES:
patent: 3915493 (1975-10-01), Brown
patent: 3917312 (1975-11-01), Rodaway
patent: 4805952 (1989-02-01), Coleman
patent: 4967864 (1990-11-01), Boyer et al.
patent: 4978097 (1990-12-01), Froutzis
patent: 5326067 (1994-07-01), Gonzalez
patent: 5496088 (1996-03-01), Stewart
patent: 5593211 (1997-01-01), Jay et al.
patent: 2003/0151294 (2003-08-01), Glater
D'Adamo Stephen
Rosenberg , Klein & Lee
Sunpex Technology Co., Ltd.
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