Improvements in Means or Apparatus for Raising and Lowering the Seats of Music Stools, Office Stools, and like Articles.
Year: 1889

page_text: Date of Application, 14th Nov., 1889-Accepted, 11th Jan., 1890
COMPLETE SPECIFICATION.
Improvements in Means or Apparatus for Raising and Lowering the
Seats of Music Stools, Office Stools, and like Articles.
I, CHARLES CHENU, of Etampes, France, Manufacturer of music stools, do hereby
declare the nature of this invention and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement :-
This invention has for object improvements in means or apparatus for raising and
lowering the seats of music stools, office stools and like articles.
Various arrangements have been proposed for giving to the seats of adjustable music
stools the stability which they lack more and more as the seat is raised; but up to the
present time none of the various arrangements has been of the required simplicity, nor
has fully obtained the desired result. The want of stability found in music stools as
at present constructed is due to the employment of the ordinary screw the rapid
wearing out of which produces shakiness and instability of the seat.
Now according to the present invention there is fixed in the foot of the stool or
other article a nut having a spiral of large diameter, and there is adapted to the seat,
as a substitute for the ordinary screw, a cylindrical piece provided on its periphery
with three or more rollers or sliders which fit and roll between the spirals of the nut
in such a manner that the elevation or descent of the seat is obtained by the rotation
of the sent and of the piece aforesaid. The elevation of the seat may be effected as
rapidly as desired, and at whatever height the seat may be, the bearing is always of
considerable extent and consequently the stability of the seat is assured.
The wear and tear is practically nil, as friction is caused only by the rolling of
surfaces in contact. Instead of the nut being fixed in the foot, it may be fixed to the
seat, and the piece with the rollers may be fixed to the foot; the same result is then
obtained, that is to say, stability of the seat at all heights.
The improved raising and lowering arrangement is applicable to stands, drawing
room tables and all similar articles or appliances.
Fig. 1 on the annexed sheet of drawings is a vertical section of a music stool with
the improved raising and lowering arrangement.
Fig. 2 illustrates partly in section and partly in elevation, the nut fixed in the
foot.
Figs. 3 and 4 shew in elevation and in plan the piece with rollers attached to the
seat.
Fig. 5 illustrates a modified form of nut or spiral formed by helical winding of a
T iron.
The stool comprises the foot consisting of the body a, the feet a¹, a, a, and the seat b
connected together by the improved raising and lowering arrangement. In the foot a
is fixed by means of screws v a threaded box or nut c made for example of a casting of
brass or other suitable metal. Or it may be made of a spiral of T iron (Fig. 5)
coiled on a helicoidal mandrel or in any other suitable manner.
In all cases the thread of the nut (Fig. 2) or that shewn in Fig. 5, will have a
relatively large diameter sny of nine to ten centimetres or even more, with a pitch
more or less quick.
The seat is mounted on a stem d the lower end of which is provided with a cylin-
drical piece or sleeve of cast iron or bronze or other metal. This piece is provided
at points in its periphery with three or more fixed pins upon which are loosely
mounted rollers y adapted to roll in the spirals of the nut c which constitute a
helicoidal path for the same, obliging them to ascend or to descend according as
the seat bis rotated to the right or to the left.
It will be understood that this combination of the nut e, Fig. 2, or of the spiral,
Fig. 5, with the part f provided with rollers is designed to provide the movable
part with a firm bearing which may be of any desired extent, since the diameter of

page_text: the nut or of the spiral has no limit except that of convenience. The moving parts
being provided at the points of contact with rollers, pins or axes with ferrules, or other
rolling parts there will be very slight friction and wear.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
ist. A raising and lowering device for music stools and like articles, comprising: a
nut or spiral in combination, with a cylindrical piece carrying rollers, substantially, as
described.
2. A raising and lowering device for music stools and like articles, comprising a
nut or spiral formed of Ṭ iron in combination with a cylindrical piece carrying rollers
substantially as described.
3. A raising and lowering device for music stools and like articles, comprising a
nut or spiral fixed in the foot in combination with a cylindrical piece fixed or attached
to the seat, and carrying rollers, the said rollers running upon the thread of the nut
or spiral substantially as described.
4. A raising and lowering device for music stools and like articles, comprising a
nut or spiral fixed in the seat in combination with a cylindrical piece fixed or attached
to the foot, and carrying rollers, the said rollers running upon the thread of the nut
or spiral substantially as described.
5. The combination of the foot a nut c cylindrical piece & rollers g g and seat b
substantially as described.
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