Improvements in or relating to Sliding Window Sashes.
Year: 1895

page_text: Improvements in or relating to Sliding Window Sashes.
I JOHN RICHARD JARVIS of 253 Hackney Road in the County of London
Builder, do hereby declare the nature of this invention to be as follows:-
This invention is designed to automatically lock sliding sashes to prevent them
being opened from the outside when both sashes are closed, or when the bottom
sash is open and the top sash is closed to prevent the bottom sash from being opened
to a greater extent or vice versa.
According to this invention I screw to each of the bottom sash stiles, at the top
thereof, a hinged piece of metal of an obtuse angle form, and to the inner face of
each of the sash stiles of the upper sash I screw a rack having teeth thereon of
such form and so arranged that the top end of the aforesaid metal piece shall come
under the said teeth, in order to lock the sashes as aforesaid.
The aforesaid metal piece is so formed and fixed in position that no strain shall
be thrown on the joint.
The racks are of such thickness and are screwed on to the sash stiles in
such a manner as to cover the space between the meeting rails when the sashes
are closed.
L
100%
BROWNE & Co.,
9 Warwick Court, Gray's Inn, London, W.C., Agents for the Applicant.
I JOHN RICHARD JARVIS, of 253 Hackney Road in the County of London,
Builder, 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 :-
This invention is designed to automatically lock sliding sashes, to prevent them
from being opened from the outside, when both sashes are closed, or when the
bottom sash is opened and the top sash is closed to prevent the bottom sash from
being opened to a greater extent or vice versa.
According to this invention I screw to each side of the top of the bottom sash
stile a hinged stop piece, of metal of an obtuse angled form, and to the inner face
of each sash stile of the upper sash, I screw a rack having suitable teeth thereon,
of such form and so arranged that the top of the said metal stop piece shall come
under the said teeth in order to lock the sashes as aforesaid.
The aforesaid metal stop piece is so formed and fixed in position that no strain
shall be thrown on the joint.
The racks are of such thickness and are screwed on to the sash stiles in such a
manner as to cover the space between the meeting rails whether the sashes are
opened or closed.

page_text: And in order that my said invention may be better understood, I will now
proceed to describe the same with reference to the drawings accompanying this
Specification, in which
Fig. 1 shews a side elevation of the stiles of the top and bottom sashes
of a window fitted with my improvements, Fig. 2 is a front elevation of
the same,
Figs. 3 and 4 are details hereafter referred to.
The same letters denote the same parts in all the views.
a shews the top of the bottom sash stile of the window, on to which is screwed
the metal stop piece of an obtuse angled form. This piece is hinged at c, and
is shewn detached at Fig. 3 in elevation, and at Fig. 4 in plan. d shews the bottom
of the upper sash stile, to which is screwed a toothed rack e. The piece band
rack I propose to fix similarly to each of the sash stiles. f shews a link to
facilitate the turning of the piece out of position, as represented at Fig. 3.
The device is shewn in the position it would assume when the sashes are locked
together.
:
Now if it is required to unlock the sashes, the link fis pulled down by its outer
end and this will pull the piece into position shewn in Fig. 3 detached when
either of the sashes can be opened and supposing the bottom sash to be opened
and the top one to be kept closed, and the piece b to be turned into position again,
it will be impossible to open the bottom sash further, without throwing the piece b
out of position; although the bottom sash may be closed, in which case the sashes
will be automatically locked together. Again supposing the bottom sash to be
opened as aforesaid, the top sash may also be opened, but only to the same extent
as that to which the bottom one was opened, since the bottom sash will be closed
as the top one is pulled down. When it is required to close the top sash, it is
simply necessary (with the stop piece b in position) to push up the bottom sash,
which closes the top sash, and the bottom sash is then closed by simply pulling it
down, and both sashes are locked.
The principle of my invention depends upon the side of the stop piece towards
the rack being parallel to the inclined surfaces of the teeth of the rack, and forming
an obtuse angle with the top of the lower sash stile, as will be clearly seen on
reference to Fig. 1. The form of the piece b shewn on the drawing is an example
of the most scientific way of carrying the above into effect.
It will be seen that the pivot or hinge c of the piece b is so placed above the
bottom sash stile that the angular point will rest on the upper surface of the
lower sash stile in such a way that any strain will be borne at this point instead of
at the joint.
I do not wish to confine myself to the use of a rack although I prefer this, as the
piece b will act without.
By the use of this invention it will be impossible to open the window from the
outside without breaking the glass, as the sashes are securely locked together and
the rack e is fitted on to the top sash stile, so as to project beyond its face, in
order to come over the opening between the meeting rails: further the top
and bottom sashes are so securely locked together that all rattling is prevented.
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 :-
1. The improvements in or relating to sliding window sashes, substantially as
set forth.
2. In sliding window sashes the combination of a rack on each of the upper
sash stiles, and a stop piece on each of the bottom sash stiles: such stop piece
being so formed that the side thereof towards the rack is parallel to the
inclined surfaces of the teeth of the said rack, and forms an obtuse angle with
the top of the sash stile, all for the purposes set forth.
3. In sliding window sashes the employment of a stop piece, such piece being

page_text: so formed and hinged or pivotted in position that the angular point thereof
shall rest on the top surface of the upper sash stile, for the purpose set forth.
Dated this Twenty-fourth day of January 1896.
BROWNE & Co.,
9 Warwick Court, Gray's Inn, London, W.C., Agents for the Applicant.