IMPROVEMENTS IN WINDOW FRAMES AND SASHES FOR THE PURPOSES OF VENTILATION."
Year: 1880

page_text: LETTERS PATENT to William Wilson, of Liverpool, in the County of Lancaster,
for an Invention of "IMPROVEMENTS IN WINDOW FRAMES AND SASHES FOR
THE PURPOSES OF VENTILATION."
PROVISIONAL SPECIFICATION left by the said William Wilson at the Office
of the Commissioners of Patents on the 12th July 1880.
WILLIAM WILSON, of Liverpool, in the County of Lancaster. "IMPROVEMENTS
IN WINDOW FRAMES AND SASHES FOR THE PURPOSES OF VENTILATION."
This Invention has for its object the more effectual ventilation of rooms, especially
in rainy and windy weather, when freely open windows are undesirable.
It consists in adding to the top of the window sash a ventilator, consisting
preferably of louvres, and making a chamber in the reveal or head of the window
for said louvres to slide into. When the window is closed the louvres are out of
sight, but when the top sash is slightly drawn down one or more of the louvres
appear. A scale rack and pawl or other apparatus can be placed on the sashes,
frame, or both, so as to stop the descent of the window sash, or iudicate exactly
when one, two, or more louvers are exposed. Instead of the louvers other forms of
ventilator, such as skeleton frames covered with perforated zinc or other porous
material, could be used.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Wilson in the Great Seal Patent Office on the 12th
January 1881.
WILLIAM WILSON, of Liverpool, in the County of Lancaster. "IMPROVEMENTS
IN WINDOW FRAMES AND SASHES FOR THE PURPOSE OF VENTILATION."
This Invention has for its object the more effectual ventilation of rooms, especially
in rainy-and-windy-weather, when freely open windows are undesirable.
In consists in adding to the top of the window sash a ventilator, consisting.
preferably of louvres, and making a chamber in the reveal or head of the window
for said louvres to slide into. When the window is closed the louvres aro out of
sight, but when the top sash is slightly drawn down one or more of the louvres
appear. A scale rack and pawl or other apparatus can be placed on the sashes,
frame, or both, so as to stop the descent of the window sash, or indicate exactly
when one, two, or more louvres are exposed.
In the Drawings, Fig. 1 shows an elevation of window and frame, Fig. 2, a
vertical section of same. In these, A. is the top sash; B is the bottom sash;
C, louvres (variable in number); D, chamber in the reveal E, varying in depth to
suit depth of ventilator. In place of louvres, however, other forms of ventilators
can be used, such as skeleton frames covered with perforated sheet zinc, or with
sheet mica valves protected from the weather, and capablo of only opening outward,.
thus preventing down draught while allowing the escape of vitiated air. The main
differences between this and other ventilators placed at the top of windows being,
first, that it forms a rigid portion of the sash itself; second, that it requires no
manipulation but the ordinary one of opening a window; third, it gives an ingress
ventilation between the sashes and an outlet one between the louvres, both opened
at one operation, and both so arranged that the wind cannot blow directly into the
room, while the ventilation is practically unimpeded both in regard to entrance of
fresh air and exit of foul.
Having now described my Invention, and the best mode known to me of carrying
it into effect, I claim as my patented Invention,-
First. The manufacture of window sashes with their upper portions forming
ventilators, which ventilators are closed by sliding into a recess in the frame when
the window is closed, but are open when the said sashes are drawn down so as to
expose the said ventilators, substantially as described.
Second. The manufacture of window frames with a recess in the reveal, or a box
so arranged that when the upper sash is drawn up its ventilating top will project
into said recess or box so as to cover to a greater or less degree ventilating holes
specially formed in the said ventilating top.
In witness whereof, I, the said William Wilson, have hereunto set my hand
and seal, this Eleventh day of January, in the year of our Lord One
thousand eight hundred and eighty one.
Witness,
W. P. THOMPSON,
Patent Agent,
Liverpool & London.
WILLIAM WILSON. (L.S.)