Improved Means for Preventing Sliding Window-sashes from being Opened from the Exterior Side Beyond a Given Point.
Year: 1889

page_text: Date of Application, 11th July, 1889-Accepted, 17th Aug., 1889
COMPLETE SPECIFICATION.
Improved Means for Preventing Sliding Window-sashes from being
Opened from the Exterior Side Beyond a Given Point.
I, THOMAS POOLEY DESCOU, of Lyoth, Lindfield, Haywards Heath, in the county
of Sussex, Gentleman, 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 has for its object to provide improved means whereby window-sashes
may be left open to a certain extent without the liability of their being opened,
from the outside of the window, sufficiently far to allow the entrance of a person
through such window.
Devices for this purpose must be capable of being operated from the inside of
the window, to allow the sashes to be moved to any desired extent.
It frequently happens, however, with such devices, as heretofore constructed, that,
owing to the negligence or carelessness of servants and others, such devices are not
returned to their operative positions and thus afford no protection.
My said invention consists in the provision of stops or guards, which, after they
have been moved to allow the sashes to be opened beyond the limit allowed by the
said stops or guards will automatically reassume their operative position.
In the accompanying drawing :-
Figure 1 is a front view of a stop or guard constructed according to my invention.
Figure 2 is a plan of the same; and,
Figure 3 is a view looking in the direction of the arrow Figure 2.
Figure 4 is an elevation illustrating the application of my stop or guard to a
window-sash; and,
1
Figure 5 is a section on the line x x figure 4.
My improved stop or guard comprises two plates a, b, which are jointed together in
the same manner as the two parts of a hinge, the jointing pin being surrounded
by a spiral spring, the ends of which are respectively connected to the two plates a, b,
so as normally to maintain them in the position shown in figure 2. The two
plates a, b are provided with abutting edges c to prevent them from moving beyond
the position shown in the said figure 2.
The plate a of the device is attached to the upper window-sash d at a suitable
distance above its meeting-rail e, as shown in figure 4, so that the plate 6 will
normally project over the meeting rail f of the lower sash g, as shown in figure 5, and
prevent either sash from being moved beyond the previously determined limit. A
plate his fixed to the railf to prevent it from being damaged by contact with the stop
or guard.
When it is desired to open the sashes beyond the limit allowed by the stop or guard
the plate 6 is turned back, as indicated by dotted lines in figures 2 and 5, so that the
meeting rail can pass it. So long as the stop or guard is between the two sashes,
the latter can be moved freely; as soon, however, as the said stop or guard is above
the rail f, the plate b flies out under the action of the spring.
One corner of the plate 6 is preferably cut away, as shown at i in figure 3, to enable
the said plate to be readily operated by the fingers, and the lower portion of the
curved edge chamfered or bevelled off, as shown at k in figure 1, to prevent the
plate 6 from catching under the meeting rail f, when the latter is moved past the stop
or guard.
I wish it understood that I do not confine my invention to the exact details
hereinbefore described, as it is obvious that the same can be varied, for instance, any
suitable form of spring can be used for maintaining the stop or guard in its operative
nosition.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what
I claim is :-
1. A window stop or guard adapted to automatically return to its operative
position, after it has been moved to allow the sashes to pass each other, substantially
as described.
2. The manufacture and use of the improved window stop or guard hereinbefore
described and illustrated in the accompanying drawing.
Dated the 11th day of July 1889
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.