VENTILATORS
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by the said James Norris at the Office of
the Commissioners of Patents on the 30th July 1878.
JAMES NORRIS, of Wood Green, in the County of Middlesex.
IN VENTILATORS.
"IMPROVEMENTS
This Invention relates to improvements in that description of ventilators in
which a series of louvres, either in metal or wood or other materials, are employed
for opening and closing an aperture in the side of a building or chamber requiring
the admission or exit of air for ventilation.
Ventilators of the character to which my improvements apply consist of a series
of louvre blades or boards set in a frame and connected together by a bar jointed to
the back of each louvre blade or board. The weight of the connecting bar when
free acts to open the series of louvres simultaneously for the admission or exit
of air.
The louvres are closed by means of a gut or cord passing over a pulley mounted
in the front part of the frame, the cord being attached to a lever arm fixed on the
back of the bottom louvre board or blade. Now this arrangement for setting or
closing the ventilator is very liable to get out of repair, being troublesome and
expensive to put in order again, and the object of my improvements is to simplify
the means employed for setting and closing the louvre blades or boards.

page_text: For this purpose according to my improvements a small lever is mounted on a
stud at one end of the frame in which the louvre blades or boards are mounted.
One end of this lever is fitted with an antifriction roller and acts freely against
the inner surface of the lower blade or board, or it may be any other of the series
of louvre blades or boards.
A link is attached to the outer end of the closing lever, several notches or teeth
being formed thereon which engage with a projection or catch on the frame so as to
set the louvre blades or boards more or less open.
A chain or wire in place of a gut or cord is attached to the link for closing or
setting the louvres when required.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Norris in the Great Seal Patent Office on the 30th, January
1879.
JAMES NORRIS, of Wood Green, in the County of Middlesex,
IN VENTILATORS."
"IMPROVEMENTS
My Invention relates to improvements in that description of ventilators in which
a series of louvres, either in metal or other materials, are employed for opening and
closing an aperture in the side of a building or chamber requiring the admission or
exit of air for ventilation.
Ventilators of the character to which my improvements apply consist of a series
of louvre blades or boards set in a frame and connected together by a bar, jointed
to the back of each louvre blade or board. The weight of the connecting bar when
free acts to open the series of louvres simultaneously for the admission or exit
of air.
The louvres are closed by means of a gut or cord passing over a pulley mounted
in the front part of the frame, the cord being attached to a lever arm fixed on
the back of bottom louvre board or blade. Now this arrangement for setting or
closing the ventilator is very liable to get out of repair, being troublesome and
expensive to put in order again, and the object of my improvements is to simplify
the means employed for setting and closing the louvre blades or boards.
And in order that my improvements may be clearly understood and readily carried
into practice, I will proceed to describe the Drawings hereto annexed.
DESCRIPTION OF THE. DRAWINGS.
Figure 1 is a front view; Figure 2, a transverse section; and Figure 3, a back
view of a ventilator having my improvements applied thereto.
a is a small lever mounted on a stud a¹ at one end of the frame bin which the
louvre blades or boards c are mounted. One end of the lever a is fitted with an
antifriction roller a² and acts freely against the inner surface of the lower blade or
board, or it may be any other of the series of louvre blades or boards.
A link d is attached to the outer end of the closing lever a, several notches or
teeth being formed thereon which engage with a projection or catch b¹ on the
frame so as to set the louvre blades or boards c more or less open.
A chain or wire in place of a gut or cord is attached to the link & for closing or
setting the louvres when required.
Having thus described the nature of my Invention, and the manner of performing
or carrying the same into practice, I would remark that I do not claim any
of the parts separately which are well known and in common use, but what I
claim is, the improved method of opening and closing the louvre blades or boards
of ventilators by means of the lever a, substantially in the manner and for the
purpose herein-before described and represented in the Drawings hereto annexed.
In witness whereof, I, the said James Norris, have hereunto set my hand
and seal, this Thirtieth day of January, in the year of our Lord One
thousand eight hundred and seventy-nine.
JAMES NORRIS. (L.S.)