An Improved Means of Ventilation Adaptable to Existing Sash Windows.
Year: 1889

page_text: Date of Application, 14th May, 1889
Complete Specification Left, 10th Feb., 1890-Accepted, 22nd Mar., 1890
PROVISIONAL SPECIFICATION.
An Improved Means of Ventilation Adaptable to Existing Sash
Windows.
I, WILLIAM MACDONALD of 4 Brook Street North Egremont Cheshire Butler do
hereby declare the nature of this invention to be as follows:-
My Invention consists in placing a continuous piece of wood or metal to block
up the bottom sash of a window. This piece is formed with a rebate and bead behind
which the bottom rail of sash rests. When this block is in position, the meeting rail
of the lower sash is some distance above the meeting rail of the upper sash and the
space thus maintaned is a continuous means of ventilation all along the length of the
sash.
I do not restrict inyself to materials in making my block or to the precise section
COMPLETE SPECIFICATION.
An Improved Means of Ventilation Adaptable to Existing Sash
Windows.
1, WILLIAM MACDONALD of 4 Brook Street North Egremont, Cheshire Butler do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
My invention relates to an improved means or device adaptable to the lower sashes
of windows for the purpose of assisting the ventilation of living or other rooms or of
any enclosed spaces. Hitherto whenever additional ventilation has been required in
a living room by its occupant recourse was had to the windows by sliding one sash of
which the egress of foul air and ingress of fresh air were obtained. When however
the lower sash was raised for this purpose and so as to obtain a central draught of air
at the junction of the two sashes considerable inconvenience was experienced by the
air entering at the same time below the lower rail of the bottom sash as in ordinary
modern built houses the beading inside the window sill is not high enough to allow of
Now my
the lower rail of the bottom sash being raised sufficiently for that purpose.
invention is designed to remedy this defect and to enable the bottom sash being raised
without allowing the entrance of air below the same place fix or secure in any con-
venient manner accordingly a continuous bar of wood or other suitable material upon
the window sill so that the back thereof may rest against the above mentioned
while the underside of the lower rail of the bottom sash rests on the top of the
said bar and against an inside beading thereof and in order that my invention may be
more fully understood I have shown the same in the accompanying drawings in which
Fig. 1 is a front elevation of a portion of a window showing the lower sash raised and
resting upon my improved device. Fig. 2 is a sectional plan showing my improved
device in position and Fig. 3 a central vertical section of Fig. 1. Figures 4 and 5
modification
show a partial vertical section and sectional elevation respectively of a
of my invention like letters of reference indicate corresponding parts in the various
figures. B is the bar of wood as other material provided with a beading bin
front and sloping top and bottom and t' respectively this bar is placed against the
inner beading of the sills and secured to the said sills as clearly shown in Fig. 3
by means of pegs p fixed to the sills and entering corresponding openings o o in the

page_text: underside of the bar B as shown in dotted lines in fig. 2 or I may obviously fix the
pegs in the underside of the bar B to enter corresponding holes formed on the
sill s.
In the modification shown in Figs. 4 and 5 the bar B is furnished with pegs p in
its undersurface and with a narrow filet formed centrally on the top of the said bar.
This fillet enters a corresponding groove formed in the underside of the lower rail r
of the bottom sash S.
I may use other means for securing the bar B either to the sills or to the
lower rail or to both according as experience may direct without departing from the
nature of my invention.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is
The improved means of ventilation adaptable to windows provided with sliding
sashes arranged operating substantially as herein before described and shown and
for the purpose set forth.
Dafad this 102
:
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicant.
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicant.