IMPROVEMENTS IN VENTILATING CASEMENTS
Year: 1883

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PROVISIONAL SPECIFICATION left by Alfred Julius Boult at the Office of
the Commissioners of Patents on the 5th July 1883. A" communication from
Messrs Bouquet and Bulle of Besançou, France
7.
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ALFRED JULIUS BOULT of 323 High, Holborn in the county of Middlesex
Engineer "IMPROVEMENTS IN VENTILATING CASEMENTS [a communication from
Messrs Bouquet and Bulle of Besançon, France]
This invention relates to an improved ventilating casement or window having
movable flaps or strips of glass in place of the single flap or door employed in
the casements or ventilators heretofore constructed and thus obviating all the
disadvantages attending the latter arrangement. The improved apparatus is
applicable to all openings in buildings irrespective of the form of the orifice and
its use will be attended with especial advantage in hospitals, schools, hot houses,
barracks, railway stations, government offices and other public buildings in which
it is desirable to control the ventilation and regulate the temperature without
obstructing the light.
"The improved window or casement constructed according to this invention is
composed of the following parts viz.―
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1st A fixed frame of angle iron.
2nd Movable strips of glass."
3rd Inoxidisable metal swivelling frames provided with lever arms and set
screws
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4th A chain for working the apparatus
5th A rubber packing placed between the swivelling frames and the vertical
sides of the window.
1st The fixed frame of Angle iron
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This frame is composed of angle iron about 1/ (0·0025) thick with a 5/in
(0.016) web and made the exact shape of the opening in which the casement is
to be placed and is retained in position' by means of screws entering the sides of
the opening. Holes about 3/16" (0·005) in diameter are formed about 4in (0.10)
apart from centre to centre in the upright sides of the frame being arranged to
correspond so as to receive the pivots of the strips of glass hereinafter described.
2nd The glass Strips.
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The glass strips are about 4'/.** (0.11) wide so that when closed they overlap
bout 3 (0,01). The lower angles of each strip are bevelled off for about 3/ in
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The swivelling frames are so arranged as to support the strips of glass in such a
manner as to enable the latter to partake of a movement of rotation and afford
facility for replacing a broken strip when necessary. These frames or strip holders
are made of inoxidisable metal of U section the total width of the branches of
the U being about 5% (0016) The extremities of the strips of glass are pushed
to the bottom of the groove into which they fit closely. The lower part is cut out
in an ornamental pattern and stops at about 5/ (.016) from the bottom edge of
the strip. The upper part is cut out externally so as to allow the overlapping
part of the strip, next above to lie directly on the glass. The back extends flush
with the surface of the glass along the entire width of the latter; to this projecting
part is soldered the stud or pivot 3/10 (005) diameter and 3/16 (.005) long
(carrying the hinge 3/1 (0-005) long which engages with the iron frame of the
casement. A set screw destined to retain the strip of glass and to maintain the
hinges at the proper distance apart is placed at about the middle of the strip
holder at about 2in (0.05) from the lower edge of the strip. This screw has a
head / (0.01) wide and passes through both sides of the strip holder or frame,
and through the strip itself being screwed at the opposite side into a nut soldered
to the strip holder. The strip and the swivelling holders or frames at either end
thereof are thus firmly and rigidly tied together and each strip is capable of
turning up or down on its pivots. A round lever arm about 3/1 (0005) diameter
is soldered to the inner side of the strip holders extending along the side of the
latter for about 3 (0.02) from the upper edge whence it is continued upwards
in the form of a lever arm curved to an arc of a circle and projecting about 1in
(0.25) measured perpendicularly from the surface of the strip and rising about
3/in or 5/8 (0.015) above the upper edge of the strip the extremity of this arm
is provided with a hole or eye for the reception of a ring forming part of the chain
by which the apparatus is worked.
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4th The chain.
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The chain for working the ventilator is composed of round brass 3/18 (0.005)
diameter and consists of links having rings.at their extremities connected together
by a third ring which. also passes through the hole in the lever on the corre
sponding swivelling strip. All the rings are soldered or otherwise so constructed
as to prevent stretching or distortion.
The. chain is so arranged relatively to the strips that when the casement is
closed by lowering the strips the lower ring of each link is, level with the hole in
the corresponding lever arm.
This chain is terminated by a series of rings of different diameters capable of
being attached to a hook at the lower part of the casement so as to enable the
strips to be held open to any desired extent.
5th Rubber packing.
A rectangular band of india rubber is placed in the angle of the angle iron
between the latter and the swivelling strips or flaps in order to make a tight joint
and prevent dranghts of air from entering at these points. This india rubber
exactly fills all the spaces between the swivelling flaps and the main frame of the
casement at the extremities of the strips as well as at the upper and lower part
of the casement
The above dimensions are given so as to give a clear- understanding of the
invention; they can of course be varied like the other details.