AN IMPROVEMENT IN THE WORKING AND SECURING OF SLIDING TUBES, APPLICABLE TO GAS CHANDELIERS, LAMPS, AND OTHER PURPOSES." PROVISIONAL SPECIFICATION
Year: 1859

page_text: LETTERS PATENT to Alexis Jean Dessales, of 13, Rue des Enfants
Rouges, Paris, in the Empire of France, for the Invention of "AN
IMPROVEMENT IN THE WORKING AND SECURING OF SLIDING TUBES, APPLICABLE
TO GAS CHANDELIERS, LAMPS, AND OTHER PURPOSES."
PROVISIONAL SPECIFICATION left by the said Alexis Jean Dessales at
the Office of the Commissioners of Patents, with his Petition, on
the 23rd June 1859.
I, ALEXIS JEAN DESSALES, of 18, Rue des Enfants Rouges, Paris, in the
Empire of France, do hereby declare the nature of the said Invention for
"AN IMPROVEMENT IN THE WORKING AND SECURING OF SLIDING TUBES, APPLICABLE
TO GAS CHANDELIERS, LAMPS, AND OTHER PURPOSES," to be as follows:-
This Invention consists in an improvement in the working of tubes, sliding
one within the other where it is necessary to raise or lower, lengthen or
shorten, and secure at any required distance, chandeliers, lamps, and such like
articles; in having the internal tube grooved at equal distances, and by
placing on each side of the outer tube a steel spring, terminating in a clasp,
which enters the groove, and serve to hold the internal tube firmly in its
place. By turning gently the internal tube to the right, a moveable key or
plate, placed at the extremity of the outer tube and between the two steel

page_text: springs, is brought into play, causing the clasps which fix in the grooves of the
internal tube to loose their hold, and allow the internal tube to descend. By
turning the internal tube or chandelier attached to it to the left, the pressure
of the key or plate upon the springs is removed, and the clasps are allowed to
resume their hold in the groove of the internal tube, and secure it firmly.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Alexis Jean Dessales in the Great Seal Patent Office on
the 22nd December 1859.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXIS
JEAN DESSALES, of 13, Rue des Enfants Rouges, Paris, in the Empire of
France, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of June, in the year of our Lord
One thousand eight hundred and fifty-nine, in the twenty-third year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Alexis Jean Dessales, Her special licence that I, the said Alexis Jean
Dessales, my executors, administrators, and assigns, or such others as I, the
said Alexis Jean Dessales, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at 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
"WORKING AND SECURING OF SLIDING TUBES, APPLICABLE TO GAS CHANDELIERS,
LAMPS, AND OTHEя PURPOSES," uрon the condition (amongst others) that I,
the said Alexis Jean Dessales, my executors or administrators, by an instru-
ment in writing under my, or their, or one of their bands 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 imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Alexis Jean Dessales, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the follow-
ing statement, reference being had to the accompanying Drawings, that is
to say :-
My Invention consists of improved mechanical appliances adapted to the

page_text: working and securing of tubes sliding one within the other, by means of which
the position of pendent and other lamps may be fixed at any desired distance,
and these improvements are intended to be used as a substitute for balance
weights, wheels, and other contrivances hitherto employed for the purpose.
The tube internal is divided at equal distances by circular conical notches,
which permit the pendent or lamp to be fixed at any desired position. To
accomplish this, I place at the lower extremity, and in the interior of the
external tube, a key or eccentric, furnished with a projecting bar which works
in a longitudinal groove in the internal tube, so that on gently turning the
internal tube to the right, the key is brought into play. This movement
causes the lateral springs terminating in claws or clasps, which are placed on
each side of the external tube, and fix in the circular conical notches of the
internal tube, to relax their hold, and permit the internal tube to descend to
the desired distance. At the extremity of the external tube is a helical spring,
and fixed to the eccentric or key in such a manner as to command the same,
and force the internal tube to resume its original position, and present the
circular notches to the claws of the lateral springs, thus preventing the danger
of the internal tube descending on removal of the hand. To raise the pendant
or lamp, it is only necessary to press the internal tube into the outer.
DESCRIPTION OF THE DRAWINGS.
Figure No. 1 represents the apparatus complete as applied to an oil lamp;
Figure No. 2 represents a longitudinal section enlarged of the tubes, external
and internal, and the mechanical appliances for the complete working of the
apparatus. This Figure represents the internal tube fixed. In this position
the arms of the lateral springs A are entered into one of the circular grooves
or notches B, which are made at equal distances on the internal tube. A
represents the lateral springs; B, the circular notches in the tube, internal;
C, the helical spring, which brings back the eccentric key to its place; D
represents the eccentric key, which serves to dilate the lateral springs when the
former is put in movement by the internal tube; F represents the box or
case which incloses the mechanism; G, the longitudinal slot or square groove
of the internal tube, which slides in the interior of the key.
Figure 3 represents a plan of the key D; H, the interior of the key, which
works in the slot G, Figure 2.
Figure 4 a transverse section of the internal tube; Figure 5, a simple
modification of Figure 1.
Having thus described the nature of my said Invention, and the manner in
which the same is to be performed, I wish it to be clearly understood that

page_text: which I claim is, the improved apparatus or combination of mechanical
apparatus herein described and shewn in the Drawings adapted to the purpose
of changing or adjusting the position of pendent and other lamps, or any mere
modification of the same, as herein fully set forth and specified.
In witness whereof, I, the said Alexis Jean Dessales, have hereunto set
my hand and seal, this Twenty-second day of December, in the year
of our Lord One thousand eight hundred and fifty-nine.
DESSALES, ALEXIS JEAN. (L.S.)