IMPROVEMENTS IN WINDOW FASTENERS to be as follows
Year: 1885

page_text: We CHARLES FREDERICK GRIMMET and JOSEPH COOK of Legge Lane Bir-
mingham in the County of Warwick Manufacturers, do hereby declare the nature
of the said invention for "IMPROVEMENTS IN WINDOW FASTENERS to be as
follows, that is to say :-
"
This invention has for its object improvements in window fasteners which are
designed, to not only be proof against any attempts to open them from the outside
but to also tighten the two sashes so thoroughly together as to prevent tho
entrance of dust or currents of air entering while at the same time the arrange-
ment is most simple and uncomplicated and which we will now explain.
:
By preference we hinge the arm of the fastener to move horizontally upon a
flanged plate having the edges finished with under fillets. The back of the arm
has a friction roller acting upon a spring which is inserted behind the said flange
and which always tends to keep the fasteners either entirely open or shut. Or
instead of this back spring an under spring may be placed inside the fillets and
made to operate direct upon the pivot-the under side of the boss of the handle in
this case being provided with a stop or projection which falls into either of the two
corresponding openings in the plate. When the arm is turned over the joint of
the sashes the point or lip passes around a projecting nose or flange upon the front
plate and a square threaded thumb screw by a few turns not only locks the
fastening but brings both sashes tightly together. This front plate may be slotted
and countersunk and the head of the thumb nut made to correspond therewith if
so desired.

page_text: We CHARLES FREDERICK GRIMMETT and JOSEPH Сooк of Legge Lane Bir-
mingham in the County of Warwick Manufacturers do hereby declare the nature
of our said invention. and in what manner the same is to be performed to bo
particularly described and ascertained in and by the following statement :-
This invention has for its object improvements in window fasteners which are
designed to not only be proof against any attempts to open them from the outside
but to also tighten the two sashes so thoroughly together as to prevent the
entrance of dust or currents of air while at the same time the arrangement is most
simple and uncomplicated which we will now explain.
By preference we hinge the arm of the fastener to move horizontally upon a
flanged plate having the edges finished with under fillets. The back of the arm
has a friction roller acting upon a spring which is inserted behind the said flange
and which always tends to keep the fastener either entirely open or shut. Or
instead of this back spring an under spring may be placed inside the fillets and
made to operate direct upon the pivot, the under side of the boss of the handle in
this case being provided with a stop or projection which falls into either of the two
corresponding openings in the plate.
When the arm is turned over the joint of the sashes the point or lip passes
around a projecting nose or flange upon the front plate and a square or other
threaded thumb screw by a few turns not only locks the fastening but brings both
sashes tightly together. This front plate may be slotted and countersunk and the
head of the thumb nut made to correspond therewith if so desired.
In order that our invention may be clearly understood and more easily carried
into practice we have appended hereunto a sheet of drawings upon which we have
illustrated several examples of such fasteners and from which other modifications
may be made to meet any special requirement.
Figure 1, is a side elevation of one of our cast metal fasteners when the lever A
is open.
Figure 2, is a plan of the same fastener also with the lever A open.
Figure 3, is a plan of the same fastener but with the lever A shut and also locked
as will be more fully explained hereafter.
Figure 4, is a plan of a similar cast metal fastener but with a cranked arm B and
solid stop C which is much easier to mould for cast metal than the hooks shown in
Figure 1, 2, 3 and 5. This is more clearly seen by the elevation of the front plate
only at Figure 6 while the back end of the lever B friction wheel b¹ and spring b²
are clearly shown by Figure 8.
Figure 5, is a plan of a fastener made from wrought metal such as sheet brass
the whole of the parts except the lever D and hook E being stamped or pressed out
which makes the fastener very light indeed.
Figure 7 is a plan of part of the back end of the lever D showing the friction
wheel d¹ and spring d² for holding the same open or shut.
The back plate F is fixed upon the back sash G as usual and the arm A is
attached to the said back plate F by the pivot a¹ and is kept open and closed by

page_text: the spring bearing against the friction wheel a², and the outer end of the lever A
is so formed with the horn a³ Figure 2 that when turned as in Figure 3 it covers
up the end and gives a very neat appearance to the whole. When the lever is
brought over as shown in Figure 3, it is ordinarily secure without the use of the
screw K but when the screw K is used it forces its end into a suitable recess in
the hook M which not only draws the sashes G and H firmly together at the right
position but it also at the same time locks the arm A across the sashes so that an
instrument applied between them cannot open or move the said arm.
The modifications shown by Figure 4 and 5 are the same in principle but
Figure 5 is lighter in its parts being stamped from sheet metal while Figure 4 has
the cranked arm B to miss the side of the projection C when turned across the
joint because C is not hooked in this case being left solid so as to be more easily
cast solid or otherwise formned up from the plate-We do not confine ourselves to
any metal but we generally make them in brass as the most suitable.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
The improvements in window fasteners of the arm A, B or D in each of their
modifications made to turn upon a pivot in combination with a screw such as K
for sitting against a projection C or hook E or M substantially as and for tho
purpose herein set forth.
.