Improvements in Window Fasteners.
Year: 1896

page_text: Date of Application, 6th Jan., 1896-Accepted, 4th Apr., 1896
COMPLETE SPECIFICATION.
Improvements in Window Fasteners.
1 THEODOR FRANKE of Dessau in the Duchy of Anhalt in the German Empire,
Manufacturer, 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 :-
The window fastener forming the subject of this invention differs advantageously
from other devices for fixing the leaves of French windows in position, by being
so arranged that it renders a change in their position impossible without the use of
the proper key, and permits two leaves above one another to be secured in different
positions by means of one lock plate; the object of my invention being chiefly to
prevent accidents to children by means of a simple and inexpensive device."
On the drawing appended hereunto a window fastener with lock plate is shewn
applied to two window leaves, one lying above the other-
Fig. 1 shewing a front view;
Fig. 2 a plan
Fig. 3 a side view of the same;
Fig. 4 a view of the lock from the underside with the bottom plate removed;
Fig. 5 a view of the bottom plate
Fig. 6 the key;
Fig. 7 a cross section of the window with opened leaf, showing the application of
the improved window fastener.
The quadrant or lock plate A serving to fix one window leaf or two leaves lying
one above the other in position, is provided in the former case on one side and in
the latter on both sides with holes a a¹, or their equivalent into which a lock bolt can
enter. A lock B is fixed on each window leat upon the same vertical style of the
frame to which the hinge is fixed, while the seginent A, is fixed to the cross rail
between the upper and lower leaves.
The lock B serving to fix the leaf consists of an oblong ease with a lateral recess f
for the key hole. The lock bolt bis formed with a square part g, with a notch for the
reception of the key bit, while the lower cylindrical part i, is surrounded by a spring k,
which abuts at one end on the square g and at the other on the projections 1, of the
lock case wall.
The bottom plate m of the lock case e carries on the lateral lug n the key
pin o, and is placed into the groove p of the lock case, after which the lock is
fixed by means of screws 7, or any other suitable means to that vertical style of
window leaf, to which the hinges are fixed. A key serves to open or shut the
lock. A second lock of the same construction would be fixed to the upper window
leaf where the lock plate A is to serve for two leaves one above the other.
By means of the improved fastener the upper and lower leaves may be fixed
in different positions, and the entirely or partly opened or closed leaves may be
locked in their respective positions; and accidents are thereby prevented which
frequently occur through children left without supervision opening closed or
partly opened windows, wide enough for them to fall out of the window, or trapping
their fingers by closing partly opened windows.
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. The manufacture and use of window fasteners constructed substantially as
herein before described and illustrated by the drawings.

page_text: 2. In a window fastener, the combination of a quadrant lock plate provided with
lock bolt holes and a spring lock that can only be opened by a key, substantially as
herein before described and illustrated by the drawings.
3. The construction of a duplex window fastener for fixing two leaves lying one
above the other independently of each other substantially as herein before described
and illustrated by the drawings.
Dated the 4th day of January 1896.
R. J. URQUHART,
57, Barton Arcade, Manchester, and 5, Clayton Square, Liverpool,
Consulting Engineer and Patent Agent.