Automatic Safety Fastenings for Window Sashes or other Sliding Sashes and Panels.
Year: 1891

page_text: Date of Application, 29th June, 1891
Complete Specification Left, 15th Mar., 1892-Accepted, 16th Apr., 1892
PROVISIONAL SPECIFICATION.
Automatic Safety Fastenings for Window Sashes or other Sliding
Sashes and Panels.
I, CHARLES EDWARD LEWIN of Adah Villa 198 Portway West Ham in the
County of Essex Commision Agent do hereby declare the nature of this invention
to be as follows:-
:-
The object of this my invention is the providing of a strong, simple and self
gripping, burgular-proof appliance or appliances for window-sashes, sliding panels
ventilators and other fittings where it is desirous that such fittings should be
rendered secure from one side, or from rattling.
I make use of pieces of hard materials preferably of metal cut or otherwise
formed of such a shape that when fixed to any part of the sash, panel, or other part
desired to be secured the piece so fitted shall touch the frame or other fixed part in
such a way that the slightest attempt to move the part to which iny invention is or
shall be fixed, the action of my invention shall automatically jam the same by an
increasing pressure thus rendering it a matter of impossibility to open the sash or
sliding part from the opposite side from that to which my invention is applied.
Furthermore the said invention provides the means whereby the person upon
whose side the fastening is fixed can at once liberate the automatic fastening from
the frame and use the fastening as a means of raising lowering or otherwise moving
the said sash or panel as may be desired.
To carry out my invention I make a cam of such a shape that when suspended
or otherwise supported in its natural or normal position from a point of suspension
or support a part of its edge touches and bears against the frame or other object
sought to be held to.
The shape of such piece of material being so regulated that any movement of the
part to be protected at once causes the cam of the fastener to revolve around its
point of support or suspension as aforementioned as the fastener revolves. But
owing to the peculiar shape of the same there will be a greater distance between the
point in contact with the frame and the point of suspension or support fixed to the
sash or slide, therefore as both point of contact and of support or suspension remain
the same a jamming action is set up between the sash & frame, or other parts of
such magnitude that no amount of force less than the breaking strain of the
materials can open the sash or slides sought to be secured by my invention.
And whereas there is generally a certain amount of liberty allowed for free
movement in such fittings I prefer then to fit one of my fastenings to each side of
the said sash or fitting, sliding door or panel.
that
my
In some cases I also prefer to add a spring to give the necessary initial contact
between the fastener and the sash or fraine and where these are made of metal I
also harden and provide teeth upon the cam or gripping part of my fastenings.
I also sometimes prefer to use electro motive force to obtain initial contact so
invention can be used in conjunction with and form the contact maker of
an electrical circuit of a burglar alarm as when so fitted any additional force
applied to the noveable part of the object sought to be secured would make contact
with the alarm and continue so fixed as long as the sash was raised, lowered or
otherwise moved out of its normal position in the slightest degree.
My invention consists therefore in the use of curved or cam like pieces of
material suspended or supported upon a point placed at such a position in relation
to its outline that its own weight or a spring or electro motive force or other
suitable available force cause the said cam to press with an initial force against the

page_text: frame of the window or other like part not being the same part as that to which the
cam itself is suspended or supported.
The cam must be fixed in such a position that the attempted opening or moving
of the sash or sliding part will cause the cam fastener to tend to revolve around its
point of support thus causing a re-action between the two objects to which the cam
is fixed and that to which it is caused to bear when revolved by the movement of
the part first mentioned. Finally I fix the cam either to the moveable part of the
sash or to its frame according to the special conditions dealt with.
CHARLES EDWARD LEWIN.
COMPLETE
SPECIFICATION.
Automatic Safety Fastenings for Window Sashes or other Sliding
Sashes and Panels.
I, CHARLES EDWARD LEWIN, of 186 Portway, West Ham, Essex, Commission
Agent, 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 object of my invention is to provide a strong, simple, and self acting,
gripping, burglar-proof appliance or appliances, applicable for window sashes,
sliding panels, ventilators, and other fittings, whereby such fittings may be rendered
secure and prevented from rattling, and this 1 effect by forming pieces of hard
materials, preferably metal, of a cam-like or eccentric form or shape, which when
fixed, for example, to any part of the sash frame or other part as hereafter indicated,
will automatically, by a jamming action, entirely frustrate any attempt to move the
sliding part of such fitting, while the person upon whose side the fastening is fixed
can at once liberate the automatic fastening. I fix the device or appliance or
appliances either to the movable part of the sash or fitting, or to its frame or fixed
part, all according to the circumstances of the case.
My invention will be readily understood by reference to the accompanying
drawing where Fig. 1 shews by way of example a perspective sectional view of a
window with double sliding sashes, shewing devices constructed according to my
invention applied thereto; and Figs. 2 and 3 shew a construction of the device in
side and end elevation, drawn to a larger scale than the previous figure.
According to my invention, A is the cam grip device, of such a shape that when
suspended or otherwise supported from a point of suspension or support, as of the
screw B, a part of its edge A¹ touches and bears against the frame or other object
sought to be held, the shape of the cam A. being so regulated that any movement,
(say in the direction of the arrows Fig. 1) of the parts C C¹ to be held, at once
causes the cam to partially turn around, in the direction of the arrow, its point of
support or suspension B aforementioned, therefore as both point of contact,
marked D, and of support or suspension, marked D', remain the same, a jamming
action is set up between the sash and frame or other parts, so that no amount of force,
less than the breaking strain of the materials, can open the sash or slides sought to
be secured by ny invention; and whereas there is generally a certain amount of
liberty allowed for the movement in such fittings, I prefer to fit one of my fastenings
to each side of the said sash or fittings, sliding door or panel. In some cases
may add a spring to give the necessary initial contact between the fastener A. and
the opposed part; and where the device A is made of metal, I may harden and
provide teeth thereon as shewn at Fig. 2. Electro-motive force may where desired
be applied to obtain initial contact, and my invention may be used in conjunction
with, and form the contact maker of, an electrical circuit of a burglar alarm, and
be so fitted that any force applied to the movable part of the object sought to be
secured would make contact with the alarm, when the sash or the like is moved out
of its norinal position in the slightest degree. My invention essentially consists in
the aforesaid curved or cam-like pieces of material suspended or supported upon a

page_text: point placed at such a position in relation to its outline that its own weight or a
spring or electro-motive force or other suitable available force will cause the said
cam to press with initial force against the frame of the window or other like part,
not being the same part to which the cam itself is suspended or supported. The
cam should be fixed in such a position that the attemped opening or moving of the
sash or sliding part will cause the cam fastener to tend to revolve around its point
of support, thus causing a reaction between the two objects, namely, that to which
the cam is fixed, and that to which it is caused to bear when revolved by the move-
ment of the part first mentioned.
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 :-
1. In fasteners for sliding window sashes, panels, or the like, the curved cam-like
or eccentric grip piece A revolvably mounted upon a support B, constructed and
acting substantially as and for the purposes set forth.
2. In automatic safety fastenings for window sashes or other sliding sashes and
frames, the curved or cam-like pieces of material suspended or supported at such a
position in relation to its outline that its own weight, spring, electro-motive
force, or other suitable available force, will cause the said cam to bear with initial
pressure against the frame of the window or other like part, not being the same part
as that to which the cam itself is suspended or held, all substantially as set forth.
Dated this 8th day of March 1892.
BREWER & SON,
33, Chancery Lane, London, Agents for Applicant.