A New or Improved Fastener for Windows.
Year: 1897

page_text: Date of Application, 2nd Mar., 1897-Accepted, 3rd Apr., 1897
A New or Improved Fastener for Windows.
I, MATTHEW ABBOTT of Newstead Colliery, near Nottingham, Enginewright,
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 an improved construction of fastener for windows, and
has for its object to provide a simple contrivance which cannot be opened from the
outside by an instrument inserted between the two sashes.
In carrying out my invention I propose to form the lever or arm employed to
fasten the window with a slot at its pivoted end. The pin commonly employed to
pivot the locking arm passes through this slot allowing the arm to be moved
slightly upwards and forwards as well as around the pivot. A spring is fitted to
the base of the fastener which is preferably formed with a ridge or ledge at the
front, and this spring presses against a boss on the arm.
When the arm is in
operative position and turned under the catch on the lower sash, the spring will
cause it to be pressed back, the pivot lying in the rear end of the slot. The plate
receiving the locking arm is formed with a notch and its rear surface is curved.
allowing a projection or extension on the arm to slide over the surface as the arm
is turned until it reaches the notch. The spring then causes the projection to enter
into the notch, and the arm is thus prevented from turning, excepting when pulled
back against the front of the spring removing the projection or nose from the notch.
Any instrument inserted between the sashes would only press against the side of
the arm and would not push it back so as to release the catch, any attempt to open.
the window improperly being thus frustrated.
In order that the invention may be more clearly understood reference is had to
the accompanying sheet of drawings, in which
Fig. 1 is a plan of the fastener showing it in closed position, and
Fig. 2 is a detail view of the arm.
The base or plate A is fitted on the meeting rail of the upper sash in the usual
mauner, and is formed with the ordinary parts to receive and carry the locking arm.
The locking arm B is as shown clearly in Fig. 2 formed with the slot b at its end,
through which slot the pivot a passes. The arm is provided with the boss b¹ at its
underside against which the spring C carried by the ledge a' on the base or plate A
bears, thus pressing the arm towards the front of the base plate. The receiving
plate D fixed on the front sash is formed with the notch d this notch being adapted
to receive the projection 62 on the upper side of the locking arm when the latter is
turned into locking position. The spring C by pressing against the boss of the arm
keeps this projection in the notch and prevents the arm turning.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is.―
(1.) An improved sash fastener having a locking arm provided with a projection
taking into a notch in the catch plate, the arm being adapted to move longitudinally
as well as turn, and a spring keeping the said arm in position, substantially as and
for the purposes specified.

page_text: (2.) In an improved sash fastener, the combination with a notched catched plate,
of a locking arm slotted at one end, a pivoted pin passing through the said plate, a
spring keeping the arm in position and projection on the arm passing into the notch,
substantially as and for the purposes specified.
(3.) The improved sash fastener comprising a locking arm provided with a boss,
a spring bearing against the said boss and projection having a notch in the catch
plate, substantially as described and shown in the accompanying drawings, and for
the purposes specified.
Darcy is 27th day of February 1031.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.