Chair type stair elevating device

Details Chair type stair elevating device Chair type stair elevating device

1999-11-01

2001-12-25

Olszewski, Robert P. (Department: 2167)

Elevator, industrial lift truck, or stationary lift for vehicle

Stairway assist for individual or minor barrier lift for...

Mounted adjacent stairway for travel parallel thereto

C187S245000, C187S270000, C104S118000

Reexamination Certificate

active

06332512

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a chair type stair elevating device that permits ascending and descending of stairs while sitting on a chair, and more particularly a rack or chain structure as a driving means for moving a chair along a guide rail.
As a welfare device for handicapped people having difficulties in ascending and descending stairs, a chair type stair elevating device having a chair movable along guide rails provided along the stairs is provided so that it is possible to ascend and descend the stairs simply by sitting on the chair.
With a conventional chair type stair elevating device
1
shown in
FIGS. 10 and 11
, guide rails B are provided along the inclination of stairs A. The guide rails B comprise parallel rails
2
and
3
. An elevating unit
4
is mounted on the rails
2
,
3
through a plurality of guide rollers
12
,
13
. The elevating device
1
has a chair
9
comprising a seat
5
, a footrest
6
, a backrest
7
and armrests
8
. By activating the elevating unit
4
by controlling a switch while seated on the chair
9
, the chair moves along the rails
2
,
3
, so that it is possible to ascend and descend the stairs A.
As a drive system for such a chair type stair elevating device
1
, a rack
10
or chain is provided parallel to the rails
2
,
3
, and a pinion
11
or sprocket of the driving machine provided in the elevating unit
4
is meshed with the rack
10
or chain, thereby moving the chair
9
along the rails
2
,
3
by the rotation of the pinion
11
or sprocket.
Such a driving arrangement by the rack
10
and pinion
11
, or chain and sprocket, is established as a driving element which can cope with both straight and curved stairs. With the arrangement of the rack
10
in a conventional chair type stair elevating device
1
, as shown in
FIG. 11
, the rack
10
was fixed to the outer surface of the guide rail
2
, which was a steel or stainless steel pipe. The arrangement utilizing a chain has a similar structure.
Chair type stair elevating devices are mostly set in homes. With the structure in which the rack
10
or chain is fixed to the outer surface of the rail
2
, the entire rack
10
or chain is visible. This lowers the design value of the entire device. Also, since the rack
10
or chain is present at a position at which it can be touched by hands, the hands may touch the shaft edge of the rack or chain and be injured. Also, clothes may be soiled or get caught by the rack
10
or chain.
An object of this invention is to provide a chair type stair elevating device in which by providing a rack or a chain in a guide rail in a hidden state, the rack or chain cannot be seen from outside, so that the design value of the entire device improves, and it is also possible to prevent injury or soiling of clothes.
SUMMARY OF THE INVENTION
According to this invention, there is provided a chair type stair elevating device comprising a guide rail and a rack parallel to the guide rail provided along stairs, an elevating unit mounted on the guide rail so as to be moved along the guide rail, a driving means having a pinion meshing with the rack, and a chair mounted to the elevating unit, characterized in that the rack is received in the guide rail in a hidden state.
The guide rail may be extruded from aluminum alloy or made of a forming material. Thus it can be easily formed with a space for receiving a rack or chain and can be adapted to cope with curved stairs.
Other features and objects of the present invention will become apparent from the following description made with reference to the accompanying drawings, in which:


REFERENCES:
patent: 5269227 (1993-12-01), Warren et al.
patent: 5967265 (1999-10-01), Bruno et al.
patent: 6082496 (2000-07-01), Bovis et al.
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