Improvements in Fastenings for Window Sashes.
Year: 1889

page_text: Date of Application, 27th Apr., 1889
Complete Specification Left, 29th May, 1889-Accepted, 3rd Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Fastenings for Window Sashes.
JAMES PRESTON, 37, St. Georges Road Wimbledon do hereby declare the nature of
this invention to be as follows:-
It will be composed of brass, with a steel or fastening bar, which on being turned
in the ordinary way of window fasteners enters a box or cover, inside of which is a
spring catch.
The steel bolt described works on a circular centre with two bevels which also
work on a spring (in a case on the outside sash) the steel bolt passes under the catch
in the box and by the aid of the spring on the other sash returns and perfectly locks
itself. A button is placed on the top of the box to unlock the bolt but this cannot be
done untill the bolt is pulled to the left, the locking is self acting.
COMPLETE SPECIFICATION.
Improvements in Fastenings for Window Sashes.
I, JAMES PRESTON, of 37 St. George's Road, Wimbledon, in the County of Surrey,
Engine Fitter, 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 relates to a fastening for window sashes which cannot be opened
from the outside and which therefore affords greater security against housebreakers
and others.
The invention is constructed in the form of an ordinary window catch except that
the catch is fastened in position by a spring lever and can only be released by first
turning the catch a little way in a direction opposite to that required for its release
and then depressing a push or button attached to one end of the said lever. There
are several minor details connected with the invention which will be explained more
fully hereafter.
And in order that my invention may be understood and carried into practice,
I will now proceed to describe the same with reference to the accompanying
drawings in which similar letters are used to indicate corresponding parts in all the
figures.
Figure 1 is a plan of my invention; Figure 2 is an elevation and Figure 3 a
sectional elevation of the same: Figures 4 to 7 shew a modification of my
invention.
The catch or fastening bar A is pivoted at C between the plates B and D, the
lower plate being screwed or otherwise fastened to the bottom bar of the upper
sash. The shoulder of the catch or fastening bar A abuts against a spring G and is
provided with two bevels E and F, the object of the first bevel being to keep the
bar A at an angle to the meeting line of the two sashes to indicate when the bar is
not secured, as shewn by the dotted lines A 3 in Fig. 1. the other bevel F is to keep
the bar A parallel with the meeting line of the sashes as in the ordinary window
catch, so that the sashes may be raised and lowered without interfering with the
fastening bar. That part of the bar A which passes under the spring lever H is
bevelled towards the front as shewn in Figure 3 so as more easily to pass under the
tooth part J of the lever H. On to the back of the bar A a rectangular piece or
box K is affixed for the purpose of closing up the opening between the ledge L and
plate M to prevent tampering with the bar A or the lever H when in position.
PA

page_text: The plate M is secured to the top bar of the bottom sash. This plate M carries a
box or receptacle N within which is pivoted at O the lever H. Beneath this lever H
is a spring P which tends to keep the lever H horizontal as shewn in Figure 3. The
forward end of this lever is bevelled as shewn so that the catch or fastening bar A
may easily be passed thereunder. When this has been done however the tooth J
takes over the back of the bar A and prevents the release thereof unless the toothed
end of the lever is withdrawn. The toothed end J of the lever fits into a recess in
the bottom plate M so as to allow the rod or bar A to lio flush with the upper surface
of the said plate M as shewn in Figure 2. The push or button Qrests upon or is
attached to the other end R of the lever H and passes through the top plate S of the
receptacle N.
To fasten the window, it is only necessary to pull over the bar A from A³ to A¹
shewn in the dotted lines at Figure 1, and then release it when it immediately springs
into the position A and now abuts against the squared edge of the inside of the
tooth J from which it cannot escape. To unfasten the window, first move the bar A
towards the left into the position A' shewn by the dotted lines in Figure 1. The
bar A is now clear of the underside of the tooth J, and on depressing the push the
lever will turn on its pivot O into the position shewn by the dotted lines in
Figure 2. If the bar A is now released it will fly out and rest at an angle to
the meeting lines of the sashes. It may be pushed back parallel therowith by the
operator.
The modification shewn in Figures 4 to 7 consists in replacing the push by a
vertical rod Q¹ moving in a slot in the upper plate S of the box or receptacle N, and
also in forming the lever H with an inclined end R, along which runs a friction
roller Tattached to the bottom of the rod Q. Figure 4 shews this modification in
sectional elevation, Figures 5 and 6 are respectively front and end elevation, and
Figure 7 is an enlarged section on the line X X Figure 4.
The rod Q¹ is provided with a knob or shoulder V bevelled so as to fit and ride
easily in a dovetail groove W as shewn in Figure 7.
When it is required to release the bar A, the rod Q is pushed along the dovetail
groove W, which extends from the centre above the pivot O nearly to the edge Z of
the top plate S (see Figure 4). As the rod Q¹ moves in the groove, the friction
roller T traverses the top side of the lever H, and depresses the inclined end R
thereby raising the forward or tooth end J. The rod Q¹ is then returned to its initial
position at the centre of the top plate S. The fastening of the window is performed
in the same manner as herein before described with reference to Figures 1 to 3.
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 construction of a window fastener with pivoted lever H tooth J thereon
and spring P, the said lever being actuated by a push Q passing through the top
plate of the receptacle N, box K on the bar A fitting over the edges Land M, all
combined and operating substantially as and for the purpose herein before set forth
and illustrated in Figures 1 to 3 of the accompanying drawings.
(2) The modified form of my invention shewn and described with reference to
Figures 4 to 7 of the accompanying drawings.
Dated this 20th 1. CM 1000
CASTLE SMITH,
Per F. W. Golby,
"Invention" Office, 54, Fleet Street, London, E.C., Agent for the Applicant.