AN IMPROVED SASH FASTENER
Year: 1871

page_text: LETTERS PATENT to Edward Burstow, of Horsham, in the County
of Sussex, Architect, for the Invention of "AN IMPROVED SASH
FASTENER."
Sealed the 5th December 1871, and dated the 2nd September 1871.
PROVISIONAL SPECIFICATION left by the said Edward Burstow at
the Office of the Commissioners of Patents, with his Petition, on
the 2nd September 1871.
I, EDWARD BURSTOw, of Horsham, in the County of Sussex, Architect,
do hereby declare the nature of the said Invention for “AN IMPROVED
SASH FASTENER," to be as follows :—
The object of this Invention is to construct a sash and casement
fastener in such a manner that it cannot be forced back from the outside
by means of a blade or similar instrument introduced between the sashes,
and yet so that it can be opened in the ordinary manner by the knob at
the end of the arm or latch. The means by which I propose to effect

page_text: this object are as follows:-I construct a sash fastener similar to those in
common use, but having hinged to the front edge of the back plate a
piece of metal, which when the arm or latch is pushed back is turned
back on its edge out of the way, and is held there by the action of the
latch on a suitable projection or stud. When the latch is drawn forward
it pushes the said piece of metal over on its hinges, and passing over it
holds it down securely in its place, which is in the space between the
front and back plates of the sash fastener, and consequently covering
the opening between the two sashes. One end of this piece of metal
may be advantageously turned up and slightly over, so as to cover very
completely that part of the latch with which an instrument introduced
as above described would come in contact. Part of the upper edge
of the latch may also be advantageously made to project, so as to
meet and be more completely covered by the the turned-up part before
mentioned.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Edward Burstow in the Great Seal Patent Office
on the 1st March 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
BURSTOW, of Horsham, in the County of Sussex, Architect, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of September, in the year of
our Lord One thousand eight hundred and seventy-one, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Edward Burstow, Her special licence
that I, the said Edward Burstow, my executors, administrators, and
assigns, or such others as I, the said Edward Burstow, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "AN IMPROVED
SASH FASTENER," upon the condition (amongst others) that I, the said

page_text: Edward Burstow, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said In-
vention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Edward Burstow, do hereby.
declare the nature of my said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the Sheet
of Drawings hereunto annexed, and forming part of this my
Specification :-
The object of this Invention is to construct a sash and casement
fastener in such a manner that it cannot be forced back from the outside
by means of a blade or other similar instrument introduced between the
sashes, and yet so that it can be opened in the ordinary manner by the
knob at the end of the arm or latch. The means by which I propose to
effect this object is as follows:-I construct a sash fastener similar to
those in common use, but having hinged on to the front edge of the
back plate a piece of metal or guard plate, which when the arm or
latch is pushed back is turned back on its edge out of the way, and is
held there by the action of the latch on a suitable projection or
stud. When the latch is drawn forward it pushes the said piece of
metal or guard plate over on its hinge, and passing over it holds it
down securely in its place, which is in the space between the front and
back plate of the sash fastener, lapping over the edge of the
front plate and consequently covering the opening between the two
sashes. One end of this guard plate may be advantageously turned
up and slightly over, so as to cover very completely that part of the
latch with which an instrument introduced as above described would
come in contact.
Figure 1 in the Sheet of Drawings hereunto annexed is a plan of my
improved sash and casement fastener as applied to the meeting bars of
an ordinary window sash, the fastening being in the open or unlatched
position; Figure 2 is a plan of the fastener in the closed or latched

page_text: position; Figure 3 is an elevation of the fastener in the latched
position from the end B; Figure 4 is an elevation of the fastener from
the same end in the unlatched position; Figure 5 is a section of the
fastener in the latched position, taken through the line C, C; Figure 6
is a section of the fastener in the unlatched position through the same
line; Figure 7 represents the guard plate, which closes over the opening
between the sashes when the fastener is latched, and which constitutes
the peculiarity of this fastener; Figures 8 and 9 are plans of a cheaper
form of the same sash fastener, 8 being in the unlatched and 9 in the
latched position.
a and represent parts of sashes or casements; c is the back plate
of the sash fastener, or that to be attached to the upper sash; d is the
front plate, or that to be attached to the lower sash; e is the quadrant
under or on to which the arm or latch f passes when closed or latched;
is the guard plato attached by means of a hinge to the plate c, and
turned up at the end k, so as more completely to protect the arm or latch f
from the action of any blade or similar instrument which might be
introduced between the sashes a and b. It is also furnished with a
projection i, which forms a stud on which the arm or latch facts as it
passes back in being opened or unlatched, so as to turn the guard plate
h on its hinge up out of the way, the stud i being held down by the arm
or latch when the fastener is open or unlatched. The arm or latch may
be provided with the usual small friction pulley working on a spring to
prevent the latch being accidentally thrown into an intermediate position
by the shaking of the sash, or the spring and pulley may be dispensed
with, the action of the guard plate being generally sufficient to keep
the latch from moving.
Having now fully described and set forth the nature and object of my
said Invention for an "
Improved Sash Fastener," together with the best
means I am acquainted with of carrying the same into practical effect,
I would remark in conclusion that I do not confine myself to the exact
shape and conformation of parts herein-before described, as the same
may bo considerably modified to meet the requirements of trade without
departing from the nature of my Invention, but what I consider to be
novel and original, and therefore claim as the Invention secured to me
by the herein-before in part recited Letters Patent is, the construction
of a saslı fastener having hinged on to the back plate a picce of

page_text: metal or guard plate, which by the action of the latch is cither shut
-down over the opening between--the sashes and securely-held- there, or
by the-same-means-is turned back out of the way when the latch is
pushed back, substantially in the manner and for the purpose herein-
before described.
Witness,
NEWNHAM BROWNE,
29 Feb. 1872.
EDWARD BURSTOW. (L.S.)