IMPROVED FASTENING FOR WINDOWS & DOORS
Year: 1888

page_text: I THOMAS ALDRIDGE of Bridgwater in the County of Somerset Accountant, do
hereby declare the nature of my Invention for IMPROVED FASTENING FOR WINDOWS
& DOORS to be as follows:-
A Self locking Fastening for Window or Door which can be used at pleasure with
or without locking-It is constructed of two bottom plates with screwholes for fixing.
And one top bar or plate connected with one of the bottom plates by a pin or spindle
to enable it to work round about half circle-Such top bar or plate runs the whole
length of the two bottom plates-The front and back of the said top bar or plate are
thicker than the centre and cut to fix into two slots made in the two bottom plates
thus preventing the top bar or plate from going beyond certain distances when opened
or closed and also acting as supports to the top bar or plate when closed. There is a
thimble which holds spring catch attached to the top bar or plate near the front with
a-hole in top bar or plate to enable spring catch to work through & drop into a hole
immediately underneath & made in bottom plate-There is a sliding plate fitted into
the top bar or plate which will by a little pressure with the finger & thumb keep the
said Spring Catch in the said thimble & prevent its dropping and locking the said
fastener. There is a keyhole in top bar or plate leading to the Spring Catch & a key
made to fit in such keyhole which will open the fastener when locked.

page_text: COMPLETE SPECIFICATION.
Improved Fastenings for Windows and Doors.
I, THOMAS ALDRIDGE of Bridgwater in the County of Somerset Accountant 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 provide a thoroughly safe and reliable fastening for
window sashes or doors which shall not only draw the sashes or doors together, and
hold them tightly in that position to prevent their shaking in windy weather, but
shall lift or draw them into position if dropped or displaced and enable them to be
locked with a fixed or loose key as preferred-It shall also have all screw holes
concealed so that even if a Burglar succeeded in breaking a pane of glass he could
not remove the fastening by unscrewing it from the sash. Moreover the fastening
can be used without being locked when desired.
To accomplish this I construct my fastening with a back plate furnished with
screw holes to attach to one of the sashes or surfaces to be fastened.
In the accompanying drawings to which I will now refer this back-plate is denoted
by the letter A.
Over the back-plate A to conceal the screw holes, I place the sliding cover plate C
having flanges D. D. to enable it to remain in place. These flanges clip the back:
plate on each side and a screw driven through the screw hole Z placed in the line
occupied by the arm when in its locked position, holds the lock-plate C firmly down
on the back plate A. It thus happens that when the fastening is closed the arm B
is directly over the screw which secures the lock-plate C and it is impossible to
withdraw it until the fastening is opened. On one corner of the back plate A is a
stud E, cast solid with the plate, which forms the back stop for the arm B. The
arm B. is attached to A by the free rivet R, and works to and fro in the usual manner
engaging with the catch G. Upon the arm B is a small cylindrical bush or nut I,
in which a spring bolt or a sinall vertical screw K works. By preference I employ
a screw as drawn which is either attached to a fixed Key L or has a square head to
engage with a loose winding Key such as M or N.
Returning to the catch G it will be seen that it differs from ordinary sash fastening
catches in having overhanging bevelled flanges O. O., and a sloping plane P., which
narrows and rises as it recedes, so that when the forepart of the arm B is forced into
its seat on the plane P. if the back-plate A happens to be on a somewhat lower level,
the arm B will gradually lift A or depress G to a level. The shape of this arm B
corresponds with that of the catch having at its extremity a bevelled dovetail
projection to correspond with the recess on the catch.
Å hole S is recessed in the catch G to receive the end of the screw K.
The figures shewn on the drawing are as follows. Fig. 1 is a front elevation of
my improved fastening. Fig. 2 is a back elevation of the same. Fig. 3 is a front
view with the catch detached. Fig. 4 is a cross section of the catch at the line Y---Z.
Fig. 5 shews two forms of winding Keys M and N. Fig. 6 is a plan in reverse of
the cover-plate C. Fig. 7 is a plan of the fastener when closed.

page_text: Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what I
claim is
(1) A locking fastening as described with fast or loose Key having all its screw-
holes covered when it is fastened, and having a bevelled dovetail joint where the arm
engages with the catch as herein described and set forth.
(2) In a locking fastening the combination of the cover-plate C, the peculiar form
of arm B, the corresponding catch G, a locking spring bolt or the locking screw
and boss or nut K I with a loose or fast key as herein described and set forth.
30
1
1000
S. S. BROMHEAD,
97, Newgate Street, London, E.C.,
Patent Agent.
S. S. BROMHEAD,
97, Newgate Street, London, E.C.,
Patent Agent.