IMPROVEMENTS IN APPARATUS FOR OPENING AND CLOSING CASEMENTS
Year: 1873

page_text: LETTERS PATENT to Thomas Elsley, of No. 32, Great Portland Street,
in the County of Middlesex, for the Invention of "IMPROVEMENTS
"
PROVISIONAL SPECIFICATION left by the said Thomas Elsley at the
Office of the Commissioners of Patents, with his Petition, on the.
6th October 1873.
I, THOMAS ELSLEY, of No. 32, Great Portland Street; in the County
3 of Middlesex, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS FOR OPENING AND CLOSING CASEMENTS," to be
as follows:-
This Invention has for its object to facilitate the opening and closing
of elevated casements, more especially those which are hinged at their
bottom to the casement frame or hung on centres. For this purpose I
employ a vertical rod, which is free to slide up or down through suitable´
eyes or guides. The lower end of the rod is jointed to a lever, which

page_text: lies parallel with the interior of the wall of the building. The upper
end of the rod is jointed to the lower arm of a lever, the upper and
longer arm of which is by a link jointed to the casement.
The axis of
the lever stands out from the wall, and is carried by a bracket, which is
fixed to the wall or casement frame, either below the centre of the
I casement or at one side of it. By this means, when the rod is moved
upwards by the lever handle at its lower extremity, the lever which is
jointed to it at the top is turned on its axis, its upper end being moved
outwards and the casement is opened. The weight of the casement then
overcomes the weight of the vertical rod, and the casement tends to
remain open. When the rod is again drawn downwards by the lever
handle the casement is closed, and when it is brought nearly into a
vertical position the weight of the rod tends to close it and keep it
closed.
The lever handle, by which the vertical rod is raised and lowered,
may be locked in any desired position by a pin stop, so as either to keep
the casement closed or opened to any desired extent.
Casements which open on hinges at one of their sides may also be
opened and closed by similar apparatus, except that in this case the
vertical rod must be at that side of the casement which is hinged to the
casement frame, and the lever, which is jointed by a link to the case-
ment, made to turn on an axis at right angles to the wall in place of
parallel with it, as in the other arrangement.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Elsley in the Great. Seal Patent Office 25
on the 2nd April 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS.
ELSLEY, of No. 32, Great Portland Street, in the County of Middlesex;"
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 30
Letters Patent, bearing date the Sixth day of October, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-

page_text: cessors, give and grant unto me, the said Thomas Elsley, Her special
license that I, the said Thomas Elsley, my executors, administrators,
and assigns, or such others as I, the said Thomas Elsley, 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 “IMPROVEMENTS
IN APPARATUS FOR OPENING AND CLOSING CASEMENTS," upon the condition
(amongst others) that I, the said Thomas Elsley, my executors or admi-
nistrators, 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
bo 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 Thomas Elsley, 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:-
This Invention has for its object to facilitate the opening and closing
of clevated casements, more especially those which are hinged at their
bottom to the casement frame or hung on centres. For this purpose I
cmploy a vertical rod, which is free to slide up or down. The lower end
of the rod is jointed to a lever, which lies parallel with the interior of
the wall of the building, or other provision may be made for moving tho
rod upwards or downwards. The upper end of the rod is jointed to the
lower arm of a lever, the upper and longer arm of which is by a link
jointed to the casement. The axis of the lever stands out from the wall,
and is carried by a bracket, which is fixed to the wall or casement
frame, either below the centre of the casement or at one side of it. By
this means, when the rod is moved upwards by the lever handle at its
lower extremity, the lever which is jointed to it at the top is turned on
its axis, its upper end being moved outwards and the casement is
opened. The weight of the casement then overcomes the weight of the
vertical rod, and the casement tends to remain open. When the rod is
again drawn downwards by the lever handle the casement is closed, and-

page_text: As before stated similar apparatus to that above described may be
employed for opening casements, which turn upon hinges at one of their
sides, or which are hung upon pins or pivots.
Having thus described the nature of my Invention, and the manner
of performing the same, I would have it understood that I claim, the
combined arrangement of rod a, levers d, brackets f, and links e for
opening and closing casements, substantially as herein described.
In witness whereof, I, the said Thomas Elsley, have hereunto
set my hand and seal, this Second day of April, in the
year of our Lord One thousand eight hundred and seventy-
four.