AN IMPROVEMENT IN THE CONSTRUCTION OF WINDOW FASTENERS."
Year: 1876

page_text: LETTERS PATENT to Eliza Prichard, of Withington, in the County of Lancaster,
for the Invention of "AN IMPROVEMENT IN THE CONSTRUCTION OF WINDOW
FASTENERS."
PROVISIONAL SPECIFICATION left by the said Eliza Prichard at the Office
of the Commissioners of Patents on the 22nd November 1876.
ELIZA PRICHARD, of Withington, in the County of Lancaster. "AN, IMPROVE-
MENT IN THE CONSTRUCTION OF WINDOW FASTENERS."
This Invention relates to the construction of sash window fasteners of the
ordinary form, which consists of a spring lever or latch attached to the bottom bar
of the top sash, in connection with a hook or catch fixed on the top bar of the
lower sash, and is intended to prevent the possibility of the lever or latch being
forced back from the outside by means of a knife passed upwards between the two.
sashes.
In that part of the spring lever or latch which when fastened comes over the
plate which carries the book or catch I drill a hole and tap the same with a screw
thread, and I drill a corresponding hole, a little larger in diameter, and without any
screw thread, in the plate immediately beneath. In the screwed hole of the lever I
insert a screw pin, having a pointed end below and a milled head above, and when
the lever or latch has been fastened in the ordinary way it is further secured by
screwing this pin downwards through the lever or latch till its lower end passes
into the hole in the plate above named, when the lever or latch cannot be forced
back until the screw pin has been withdrawn.
The pointed end of the screw pin is made rather larger than the screwed hole
through the lever, so that the pin cannot be entirely withdrawn and lost or mislaid,
but always remains attached to the lever.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Eliza Prichard in the Great Seal Patent Office on the 19th May
1877.
ELIZA PRICHARD, of Withington, in the County of Lancaster. "IMPROVEMENTS
IN THE CONSTRUCTION OF WINDOW FASTENERS."
This Invention relates to the construction of sash window fasteners of the
ordinary form, which consists of a spring lever or latch attached to the bottom bar
of the top sash, in connection with a hook or catch fixed on the top bar of the
lower sash, and is intended to prevent the possibility of the lever or latch being
forced back from the outside by means of a knife passed upwards between the two
sashes.
Such being the nature and object of my said Invention I will now proceed to
describe more fully the manner in which the same may be carried into practical
effect; and in order that the same may be clearly understood I have annexed
hereunto a Sheet of Drawings illustrativo thereof, and have marked the same with
figures and letters of reference corresponding with those in the following
explanation thereof :-
In the annexed Drawing Fig. 1 is a front view (with the spring lever or latch
shewn in section), and Fig. 2 is a plan view of my improved window fastener;
Fig. 3 is a front view with the plate b in section; and Fig. 4 is an end- view of the
same.
a, a, and b, b, are the two plates, one of which is screwed to the top of each sash
as usual; c, c, is the ordinary spring lever or latch attached to the plate a, a; and
d, d, is the hook or catch fixed to the plate b, b.
In that part of the spring lever or latch c, c, which when fastened comes over the
plate b, b, which carries the hook or catch d, d, I drill a hole, and tap the same with
a-screw thread, and I drill a corresponding hole e a little larger in diameter, and with-
out any screw thread in the plate b, b, immediately beneath. In the screwed hole of
the lever c, c, I insert a screw pin f, f, having a pointed or rounded end below and
a milled head f¹ above, and when the lever or latch c, c, has been fastened in the
ordinary way it is further secured by screwing this pin f, f, downwards through
the lever or latch c, c, till its lower end passes into the hole e in the plate b, b, above
named (as shown at Figs. 1 and 4), when the lever or latch c, c, cannot be forced
back until the screw pin f,f, has been withdrawn, as shown at Fig. 3.
The pointed or rounded end of the screw pin f, f, may be made rather larger
than the screwed hole through the lever c, c, so that the pin cannot be entirely
withdrawn and lost or mislaid, but always remains attached to the lever; or a
few blows of a light hammer on the end of the screw thread will serve the same
purpose.
Having now described the nature and object of my said Invention, together with
the manner in which the same is to be carried into practical effect, I wish it to be
understood that I claim, the application to the spring lever or latch of an ordinary
window fastener of a screw pin, substantially in the manner and for the purpose
herein-before more particularly set forth.
In witness whereof, I, the said Eliza Prichard, have hereunto set my hand and
seal this Eighteenth day of May, in the year of our Lord One thousand eight
hundred and seventy-seven.