AN IMPROVEMENT IN MUSIC STOOLS OR CHAIRS, WHICH IMPROVEMENT IS ALSO APPLICABLE TO OTHER SEATS AND ARTICLES OF FURNITURE THE HEIGHT OF WHICH IS REQUIRED TO BE VARIABLE
Year: 1872

page_text: LETTERS PATENT to Henry Brooks, of No. 31, Cumberland Market,
Regent's Park, and No. 138, Hampstead Road, both in the County
of Middlesex, for the Invention of "AN IMPROVEMENT IN MUSIC STOOLS
OR CHAIRS, WHICH IMPROVEMENT IS ALSO APPLICABLE TO OTHER SEATS AND
ARTICLES OF FURNITURE THE HEIGHT OF WHICH IS REQUIRED TO BE
VARIABLE." A communication from abroad by Gustave Henry
Ulmann, of Rue de la Cloche, Calais, in the Republic of France.
PROVISIONAL SPECIFICATION left by the said Henry Brooks at the
Office of the Commissioners of Patents, with his Petition, on the
8th November 1872.
I, HENRY BROOKS, of No. 31, Cumberland Market, Regent's Park,
5 and No. 138, Hampstead Road, both in the County of Middlesex, do
hereby declare the nature of the said Invention for "AN IMPROVEMENT
IN MUSIC STOOLS OR CHAIRS, WHICH IMPROVEMENT IS ALSO APPLICABLE TO OTHER
SEATS AND ARTICLES OF FURNITURE THE HEIGHT OF WHICH IS REQUIRED TO BE
VARIABLE," (communicated to me from abroad by Gustave Henry

page_text: Ulmann, of Rue de la Cloche, Calais, in the Republic of France), to be
as follows:-
In order that music stools may be conveniently used by different
persons requiring different heights of seat they are generally formed
with a screw to connect the seat to the pedestal, and by turning the
seat in one or other direction the desired variation of height is obtained
within the range of the screw used. This method of adjusting the height
of music stools is one however which soon becomes unsteady, and is
otherwise very liable to get out of order, whilst it is practically limited
to seats of comparatively small area.
The object of this Invention is to remedy these objections and to
obtain a steady seat readily adjustable in height, and the size of which
is not practically limited to that for the use of one person.
For this
purpose opposite legs or supporting surfaces incline in opposite directions,
one crossing the other, or being formed capable of simultaneous
separation from or approach to the other at their opposite ends. Pivot,
wheel, or other jointed connection connects these legs or supporting
surfaces at the points of crossing. Stops regulate the distance of their
motion in either direction. The upper ends of each pair of these legs or
supporting surfaces are connected by pin or pivot joint to bars, which
are formed with or carry female screws acted, upon by screw threads
(one right and the other left handed), formed on an axis or shaft passing
under and supported by parts of the seat, having also a knob or handle
at each end of it, by turning either of which this axis or shaft will be
turned to cause the upper ends of the opposite legs or supporting surfaces
to approach towards or recede from each other, so as thereby to vary the
height of the seat. Guides control the relative movements of the upper
ends of these legs or supporting surfaces.
Such means for obtaining variable height to music stools or chairs are
also applicable to other seats required to be of different heights at
different times, as well as to tables, desks, and other articles of furniture
the height of which is required to be variable.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Brooks in the Great Seal Patent Office on
the 7th May 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
BROOKS, of No. 31, Cumberland Market, Regent's Park, and No. 138,
Hampstead Road, both in the County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of November, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Henry Brooks, Her special license that
I, the said Henry Brooks, my executors, administrators, and assigns,
or such others as I, the said Henry Brooks, my executors, administrators,
and assigns, should at any time agree with, and no others, from time
to time and all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "AN IMPROVEMENT IN MUSIC STOOLS
OR CHAIRS, WHICH IMPROVEMENT IS ALSO APPLICABLE TO OTHER SEATS AND ARTICLES
OF FURNITURE THE HEIGHT OF WHICH IS REQUIRED TO BE VARIABLE," (com-
municated to me from abroad by Gustave Henry Ulmann, of Rue
de la Cloche, Calais, in the Republic of France, upon the condition
(amongst others) that I, the said Henry Brooks, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their
hands and seals, should particularly describe and ascertain the nature of
the said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Henry Brooks, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
―
In order that, music stools may be conveniently used by different
persons requiring different heights of seat they are generally formed
with a screw to connect the seat to the pedestal, and by turning the seat

page_text: in one or other direction the desired variation of height is obtained
within the range of the screw used. This method of adjusting the height
of music stools is one however which soon becomes unsteady, and is
otherwise very liable to get out of order, whilst it is practically limited
to seats of comparatively small area.
The object of this Invention is to remedy these objections, and to
obtain a steady seat readily adjustable in height, and the size of which
is not practically limited to that for the use of one person.
But that the Invention may be fully understood, I will by the aid of
the accompanying Drawings proceed to describe means pursued by me
in on thō come into offick
Figure 1 shows á plan or top view; Figure 2 an under side view;
Figure 3 a side view; Figure 4 an end view; and Figure 5 a horizontal
section of an arrangement of music stool according to the Invention.
Figures 6 and 7 show similar views to Figures 3 and 5, but with the
parts thereof varied in relation to each other as they would be when the
seat is raised. In all the Figures the same letters indicate corresponding
parts.
a is the seat, b, b, are the supporting surfaces which also form the legs
of the stool. Of these legs or supporting surfaces there are in this
arrangement one pair on each side, those of each pair being formed to
I cross one the other at 62, where they are provided with pivot, wheel, or
such like connection, and a connecting bar ³ to facilitate the movement
of one of each of these pairs of legs on the other of them.
The upper
end of each of these legs b is connected to the corresponding parts of the
corresponding leg on the opposite side of the seat by pivots c to bars d,
and each of these bars d is formed with a female screw in it, one being
what is called "right handed" and the other "left handed" to receive
corresponding right and left handed threads e¹, e², formed on the screw
shaft e, so that by turning the screw shaft e by either of its heads or
handles e³ in one direction the bars d will be drawn towards each other,
drawing with them the upper ends of the legs b with a tendency to raise
the seat supported thereby. On the contrary by turning the screw
shaft e in the opposite direction when the seat has previously been raised.

page_text: the tendency will be to lower that seat by causing the two bars d and
the upper and lower ends of the legs b to diverge one from the other.
The central and end parts of the screw shaft e are supported and formed
simply to turn in projections a¹ and a³, a³ projecting downwards from
the under side of the seat a. ff, are guide rods affixed to the under
side of the seat a on which the bars d, d, move, and which thereby
serve to guide and control the relative motions of those bars d, d, and
consequently the movements of the upper ends of these legs or supporting
surfaces.
Figure 8 shows a plan view; Figure 9 an external side view; Figure 10.
a vertical section; Figure 11 an under side view; and Figure 12 a view
looking downwards, but with the seat removed of a slight modification
of the above. Figure 13 also shows part of an end view of this modifi-
cation; and Figure 14 an end section of the same. In these Figures
the seat is shown at about its lowest position.
Figures 15, 16, 17, 18, and 19 show corresponding views with the
parts in the position they relatively assume on the seat being raised. In
this case the seat a rests on the upper ends 6' of the arms or supporting
surfaces which are affixed to and so as to turn on the respective axes b³.
These axes 63 are supported to turn in bearings formed for them in the
frame h, to which the legs ¹ are affixed. The legs h¹ in this case being
affixed to the frame has legs are ordinarily applied to stools and other
articles. The, upper part of each of the supporting surfaces in this
case carry by pivots c a socket d, through which are formed female
screws, one right handed and the other left handed, to receive corrc-
sponding right and left hand threads e¹, e³, formed on the screw shaft e,
which is supported to turn freely in bearings a¹, a³, formed for it applied
to the under side of the seat a. In this case the seat is guided in its
correct up or down motion by means of other controlling arms f,f, each
of which at one end is capable of turning loosely on one or the other of
the rods b³, whilst the other ends of them are connected by pivots to one
or other of the sockets f¹ formed with female threads to embrace the
corresponding threads e³, e*, formed for them one right and the other left
also on the screw shaft e.
Means such as described for obtaining variable height to music stools
or chairs are also applicable to other seats required to be at different
times of different heights, as well as also to tables, desks, and other
articles of furniture the height of which is required to be variable.

page_text: Having thus described the Invention as communicated to me, I would
have it understood that I do not confine myself to the precise arrange-
ments of parts as shown and described so long as the peculiar character
of the Invention be retained; but what I claim is the improvement in
music stools or chairs and other seats and articles of furniture, whereby
the height of the same may be varied by right and left-handed screw
arrangement, and lever arms acting substantially as described.
In witness whereof, I, the said Henry Brooks, have hereunto set
my hand and seal, this Fifth day of May, in the year of our Lord
One thousand eight hundred and seventy-three.