METHOD OF ADJUSTING THE MOVEABLE PARTS OF EASELS, MUSIC STANDS, WINDOW SASHES, CHAIRS, BLINDS, &c.
Year: 1885

page_text: DAVID THORPE LEE, 1 Elm Tree Road St John's Wood London, in the county
of Middlesex, Artist do hereby declare the nature of my invention for IMPROVED
METHOD OF ADJUSTING THE MOVEABLE PARTS OF EASELS, MUSIC STANDS, WINDOW
SASHES, CHAIRS, BLINDS, &c. to be as follows:-
Between plates or supports is placed a cogged or spoked wheel; running at right
angles to the axis of this wheel, is a bar or spindle, one end of which is twisted or
screwed, so as to work into the spokes or cogs of the said wheel; to the other end
of the spindle is attached a crank, knob, or pulley, which, when turned, causes the
wheel to revolve, the spokes or cogs entering holes made at a corresponding distance
in a strip, tube, or bar attached to, or forming part of, the moveable portion: or
the supports or plates can be attached to or form part of the moveable portion if
desired; in either case, the aforesaid portion is impelled, and so is easily adjusted
to the position required, it remaining locked in that position on ceasing to turn the
spindle. Slots, grooves, holes and tongues, retain the parts at working distance.

page_text: Improved Method of Adjusting the Moveable Parts of Easels,
Music-stands, Window Sashes, Chairs, Blinds, and other
Articles.
I, DAVID THORPE LEE 1 Elm Tree Road St John's Wood London, in the county
of Middlesex, Artist, do hereby declare the nature of my invention for IMPROVED
METHOD OF ADJUSTING THE MOVEABLE PARTS OF EASELS, AND OTHER ARTICLES,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
'
The purpose of this invention is the construction of a simple appliance whereby
the moveable parts of furniture for invalids, easels, and other articles, may be
adjusted as desired by an easy and economical method.
I am aware that the combination of a screw and a cog is well known in
mechanics, but I believe that my manner of arranging and applying them in a
simple form, and as an appliance which can be attached to, or be made to form part
of, many articles requiring adjustment of parts, to be novel.
The manner of construction is as follows:-
Between plates or supports is placed a cogged or spoked wheel: running at right
angles to the axis of this wheel, is a bar or spindle, one end of which is twisted or
screwed, so as to work into the spokes or cogs of the said wheel; to the other end
of the spindle can be attached either a crank, knob, or pulley, on which being
turned, the wheel revolves, the spokes or cogs entering holes made at a corie-
sponding distance in a strip, tube, or bar, attached to, or forming part of, the
moveable portion; or the supports or plates can be attached to or form part of,
the moveable portion if desired; in either case, the aforesaid portion is impelled,
and so is easily adjusted to the position required, it remaining locked in that
position on ceasing to turn the spindle.
'
In the accompanying drawings, the manner of construction is fully explained.
Fig. 1 shows separate parts in section of my adjustment as applied to easels, or
similar articles where a vertical action is required;-(a) is the plate or support,
(b) .the spindle with twisted or screwed end, (c) a cogged or spoked wheel, (d) the
strip perforated with holes at equal distances to admit the spokes, (e) a spiral spring;
an india-rubber or other kind of washer may be used in some cases.
The aforesaid strip, tube, or bar can be attached either to the moveable or the
fixed part as required in the article to which it is applied; the said part working
in grooves or slots, or by other means retaining it at a right angle to the spindle.
Fig. 2 shows the same in, elevation, the flanges (ff) having holes in them by
means of which it is screwed to the moveable part of easel or other article.
I do not confine myself to one form of the plate or case wherein the spindle and
cog work, as these must necessarily vary according to the purposes to which the
adjustment is applied; for instance,―
Fig. 3 shows in elevation a more convenient form when it is required that the
moveable part should work horizontally.
Fig. 4 represents the form as applied to a sash.

page_text: Where it is desirable that the adjustment should be let in to the article to which
it is applied, Fig. 5 shows a convenient form for that purpose.
Fig. 6 shows its application to a music-stool, stand, or a similar article.
Neither do I confine myself to making the strip straight, as it may be in the
form of a circle or parts of a circle, where it is desired to move round or partly
round the portion of the article to which it is fixed; or in place of the said strip,
a perforated band or chain working on the spokes, may be substituted.
•
I preferably make the screwed or twisted end of the spindle work direct on the
spokes, though where the form would be more convenient, to arrange the screw or
twist at the side of the spokes, the said spokes can be made in such a form as to
allow it to be worked in that way, or a smaller cog can be made to form part of
the aforesaid wheel.
The before said spindle can be made of wire of the required strength, one end
twisted into a spiral, for the smaller kinds and where cost is a consideration.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
First. The construction of an appliance whereby the moveable portions of
various articles may be adjusted in such a way and in the manner herein before
described, and as shown upon the sheet of drawings accompanying this Specifica-
tion, or any modification thereof.
Second. The application of the aforesaid appliance or the principle thereof to
and for the purpose of adjusting or moving portions of furniture, such as couches,
chairs, tables, reading desks, invalid mattresses, easels, music-stools and stands,
sashes, modelling stands, blinds, blind racks, lamp standards, chandeliers, and for
other purposes where it is desirable that the moveable part of an article should be
held in the position to which it is adjusted, as herein specified.
Dated this 10th day of November 1985