IMPROVE- MENTS IN APPLIANCES FOR EFFECTING VENTILATION AT WINDOWS
Year: 1877

page_text: LETTERS PATENT to John William Grover, of No. 9, Victoria Chambers,
Westminster, in the County of Middlesex, for the Invention of "IMPROVE-
MENTS IN APPLIANCES FOR EFFECTING VENTILATION AT WINDOWS."
PROVISIONAL SPECIFICATION left by the said John William Grover at the
Office of the Commissioners of Patents on the 18th January 1877.
JOHN WILLIAM GROVER, of No. 9, Victoria Chambers, Westminster, in the
County of Middlesex. "IMPROVEMENTS IN APPLIANCES FOR EFFECTING VENTILATION
AT WINDOWS."
According to my present Invention I apply to the lower part of an ordinary sash
window a weather guard or air screen which rests upon the sill or frame to which
it is hinged, so that it may be moved from the vertical position to assume any
desired degree of inclination relatively to the window sash. I place this guard or
screen on the inner side of the window, so that when the lower sash is partly
thrown up the outer air will be partially or wholly prevented from entering below
the same, but will find an entrance between the two sashes, passing in over the top
of the lower one and in a vertical direction. Should more air be required, this may
be obtained by moving the guard into an inclined position away from the sash, so
that air deflected upwards by the guard can pass in between the two at any desired
angle, the guard being provided with suitable appliances for adjusting and holding
it in any desired position so as to regulate the opening, and consequently the amount
of air admitted.
In some cases the lower sash may be made to act upon the guard by means of
levers or catches, so that the act of opening the window will cause the guard to be
moved forward to the requisite degree.
The guard may be provided with side cheeks of solid or flexible material or
folding like a fan in order to prevent the entrance of air at the sides thereof.
The guard may be made recessed or concave on its outer side, so that when the
lower window sash is opened to only half the height of the guard, air can pass in
between the two in a vertical direction without inclining the guard forward, while
[Price]

page_text: when the sash is raised to the top of the guard a close joint is formed between the
two so as to stop the ingress of air at that point.
The guard may be provided either with a spring in combination with the pivot
or with india-rubber fillets, whereby when the lower sash is raised to the top of the
guard a weather-tight joint is made between the two; and I also provide either on
the bottom part of the sash or on the top of the guard a spring catch or sliding bolt,
whereby when the sash is raised it may be secured in that position in a similar
manner to that in which the upper sash is ordinarily secured to the lower one, and
pins or catches may also be provided on the upper part of the lower sash, whereby
the upper sash is secured to it when the lower one is in the raised position, thus
rendering the window as securely fastened when in that position as it is when
closed.
By preference I make the said guards of a wooden or metal framing with a glass
panel, but they may be made of any other suitable material.
By means of the said weather guards air may easily be admitted below heavy
sashes which are difficult to move by hand, by keeping these permanently in the
before-described partially opened position, and only moving the guard when
admission of air is required.
The before-described guards may also be applied in a similar manner to the
upper sash of a window, in which case they are placed outside the window in an
inverted position, that is, hinged to the frame at top and capable of being adjusted
by means of cords or rods from below, or by the motion of the sash itself as described
with reference to the lower guard.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John William Grover in the Great Seal Patent Office on the 17th July
1877.
JOHN WILLIAM GROVER, of No. 9, Victoria Chambers, Westminster, in the County
of Middlesex.. "IMPROVEMENTS IN APPLIANCES FOR EFFECTING VENTILATION AT
WINDOWS."
According to my present Invention I apply to the lower part of an ordinary sash
window a weather guard or air screen which rests upon the sill or frame to which
it is hinged, so that it may be moved from the vertical position to assume any
desired degree of inclination relatively to the window sash. I place this guard or
screen on the inner side of the window, so that when the lower sash is partly
thrown up the outer air will be partially or wholly prevented from entering below
the same, but will find an entrance between the two sashes, passing in over the top
of the lower one and in a vertical direction. Should more air be required, this may
be obtained by moving the guard into an inclined position away from the sash, so
that air deflected upwards by the guard can pass in between the two at any desired
angle, the guard being provided with suitable appliances for adjusting and holding
it in any desired position so as to regulate the opening, and conseqently the amount
of air admitted.
In some cases the lower sash may be made to act upon the guard by means of
levers or catches, so that the act of opening the window will cause the guard to be
moved forward to the requisite degree.
The guard may be provided with side cheeks of solid or flexible material or
folding like a fan in order to prevent the entrance of air at the sides thereof.
The guard may be made recessed or concave on its outer side, so that when the
lower window sash is opened to only half the height of the guard, air can pass in
between the two in a vertical direction without inclining the guard forward, while
when the sash is raised to the top of the guard a close joint is formed between the
two so as to stop the ingress of air at that point.
The guard may be provided either with a spring in combination with the pivot

page_text: the use of a fixed screen or supplemental sash at the lower part of a window frame,
as I am aware that such fixed screens or supplemental sashes have been before
employed, but I claim,―
First. The use of a weather guard or air screen hinged to the window sill or
frame and so arranged that it can either be secured in a vertical position or be
brought to any desired degree of inclination, according to the quantity of air required
to be admitted into the room, substantially as herein described.
Second. In combination with the said hinged air screen the use of flexible or
folding side cheeks for preventing the ingress of air at the sides of the screen when
in the inclined position.
Third. In combination with the said hinged air screen the use of spring catches,
bolts, or fastenings, whereby when the lower sash is raised to the top of the screen
the two are fastened together, and the lower sash is fastened to the upper
sash so
as to render the window as securely fastened when in that position as when closed,
substantially as herein described.
In witness whereof, I, the said John William Grover, have hereunto set my
hand and seal, this Sixteenth day of July, in the year of our Lord One
thousand eight hundred and seventy-seven.
J. W. GROVER. (L.S.)