An Improved Sash-fastener.
Year: 1891

page_text: Date of Application, 11th Dec., 1891
Complete Specification Left, 12th Sept., 1892-Accepted, 26th Nov., 1892
PROVISIONAL SPECIFICATION.
An Improved Sash-fastener.
I, THOMAS JOHN GAWTHORP, of 16, Long Acre, London, W.C., Artificer in
Brass and Iron do hereby declare the nature of this invention to be as follows:-
This my invention relates to an improved sash-fastening and the object of my
said invention is to devise a fastening which shall be of simple construction and
which shall also effectually prevent the unfastening of the same from the outer
side of the window by the insertion of a knife blade or other instrument between
the meeting rails of the upper and lower sashes.
In carrying my invention into practice I attach to the centre of lower rail of
the upper sash a plate having a locking lever pivotted thereon of substantially
the same construction and shape as the common sash fastening at present in use.
The said locking lever is provided at its outer end with a downwardly projecting
arin or lug for a purpose hereinafter described.
A plate hereinafter termed the locking plate is attached to the upper rail of
the lower sash in a corresponding position to the plate before mentioned and upon
the said locking plate is attached a cam which is pivotted upon a suitable fulcrum.
One of the sides of the said cam is straight and the said straight side is provided
with a turned up rim or projection.
When it is desired to lock the sashes the locking lever is rotated upon its pivot
or fulcrum to a position at right angles to the division line or opening between the
meeting rails of the sash frame. In the movement of the said lever the side
thereof comes in contact with the turned up edge of the cam thereby causing the
said cam to move with the lever until the cam comes across the opening between
the sashes in which position the straight side will be at right angles to the division
line.
Thus it will be understood that a knife or other instrument inserted between
the sashes will come in contact with the straight face of the said cam which will
effectually prevent the locking lever being moved back.
When it is desired to unlock the sash-fastening the locking lever is returned to
its position parallel to the division between the sashes and in thus moving the lug
or projection upon the underside of the said lever comes in contact with one edge
of the cam which is of such shape that it will cause the cam to return to its
normal position thereby leaving the sashes free to be opened as required.
Dated this 11th day of December 1891.
REGINALD W. BARKER,
Applicant's Agent.
COMPLETE SPECIFICATION.
An Improved Sash-fastener.
THOMAS JOHN GAWTHORP of 16 Long Acre London W.C., Artificer in
Brass & Iron 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 my invention relates to an improved sash-fastening and the object of my
said invention is to devise a fastening which shall be of simple construction and
which shall also effectually prevent the unfastening of the same from the outer
side of the window by the insertion of a knife blade or other instrument between
the meeting rails of the upper & lower sashes.

page_text: The said
In carrying my invention into practice I attach to the lower rail of the upper
sash a plate having a locking lever pivotted thereon of substantially the same
construction and shape as the common sash fastening at present in use.
locking lever is provided with two downwardly projecting arms or lugs for a purpose
hereinafter described.
A plate hereinafter termed the locking plate is attached to the upper rail of the
lower sash in a corresponding position to the plate before mentioned and upon it is
a cam which is pivotted upon a suitable fulcrum one of the sides of the cam is
straight and is provided with a turned up ridge or projection.
When it is desired to lock the sashes the locking lever is rotated upon its
fulcrum to a position at right angles to the division line or opening between the
meeting rails of the sashes. In the movement of the said lever one of the lugs
thereon comes in contact with one edge of the cam thereby causing it to move
with the lever till the turned up part thereof comes across the opening between the
sashes & alongside of the locking lever.
Thus it will be seen that a knife or other instrument inserted between the sashes
will come in contact with the turned up ridge on the cam and so be prevented from
forcing back the locking lever.
When it is desired to unlock the sashes the locking lever is returned to its
position parallel to the division between the sashes and in thus moving one of the
lugs comes in contact with the other edge of the cam and returns it to the position
clear of the opening between the sashes which are then free to move.
In the drawings Figs. 1 & 3 show the sashes unfastened. "A" is the locking
lever and "B" is the cam.
Figs. 2 & 4 show the sashes fastened the same letters indicating the same parts.
I do not bind myself to the particular forms shown on the drawing as the shapes
and positions may be varied in many ways.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
A guard cam moved by the locking lever and automatically guarding same
substantially as described.
ני.מ
101 Q
1
1000
T. J. GAWTHORP.