Improvements in Burglar Alarm Attachments for Window Blinds.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Burglar Alarm Attachments for Window Blinds.
We, ISAAC LEVIT SILVERBERG, of 184 South Sixth Street, Manufacturer,
MOSES REICHMAN, of 204 Bergen Street, Clerk, and GUSTAVUS TROXLER Jr. of
293 Waverly Avenue, Inventor, all of the City of Newark County of Essex, and
State of New Jersey, United States of America, do hereby declare the nature of
our invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to a burglar alarm attachment for window-shade rollers,
and consists of certain arrangements and combinations of parts, such as will be
hereinafter more fully described and finally pointed out in the clauses of the
claim.
In the drawings,
Figure 1 is a front view of a window frame and a shade roller provided with our
burglar alarm attachment.
Figure 2 is a similar view of the upper and lower parts of the window frame and
curtain, with the lower end of the curtain secured to a smooth pin in the window-
frame and the alarm set ready to ring the bell as soon as the ring at the bottom of
the curtain is pushed from the pin in the window frame.
Figure 3 is a vertical section of the lower part of the window frame, taken on
line in Figure 2, clearly illustrating the manner of attaching the ring on the
curtain to the smooth pin in the window frame.
Figure 4 is a full size view of the alarm which constitutes one of the brackets or
supports for one end of the shade roller.
Figure 5 is a side view of the same.
Figure 6 is a section taken on line y in Figure 4, clearly illustrating the bracket
portion in which the end of the shade roller is supported, also a cam-plate secured
to the end of the roller for vibrating a hammer which strikes the gong when the
roller rotates in its bearings, and further a pawl pivoted to the bearing plate which
engages with a notch or stop in the cam-plate to hold the roller and the curtain
secured thereon in any desirable position.
Figure 7 is a similar view illustrating the cam-plate in striking engagement with
the bell hammer, and the pawl being raised out of its engagement from the notch
or stop in the cam plate.
Similar letters of reference are employed to indicate corresponding parts in all
the figures.
In the accompanying drawings, the letter A indicates the window frame to which
are secured the ordinary pivot bracket B and our burglar alarm bracket C, between
which is arranged a spring roller D.
The alarm bracket C in which one end of the roller D rotates consists
essentially of a supporting base c provided with screw holes for securing it to
the window frame. Said base is provided with an upwardly projecting arm or
bracket having a journal bearing . The end of the roller D has attached
thereto a cam plate d from which extends a journal pin d' which rotates in the
bearing c³, as will be seen from Figures 1, 2 and 4.
Upon said base c is pivoted by means of a pin or screw c³ a hammer o
having an upwardly curved arm with which the cam end of the cam
plate d comes in contact when the shade roller rotates in its bearings and
thereby causes said arm c and the hammer to vibrate and strike against a
gong carranged on a post c' on the base c.
The bracket c' is provided with an upwardly extending portion of having an
arm cª extending out at a right angle therefṛom to which is pivoted a pawl e,

page_text: the lower end e¹ of which normally rests upon the edge of the cam-plated and
can be made to engage with a notch or stop d' on said cam plate to hold the
roller and its curtain in any desirable position, as will be seen from Figure 6.
By this construction the curtain can be slowly raised and lowered, the cam
gently striking the arm of the hammer and hardly causing a ring on the 5
gong, and said pawl e passes over said notch without interfering with the rotation
of the roller, which, however, can be made to stop by slowly allowing the
end of the pawl e to drop into said notch ³ in the manner of the ordinary
pawls used on spring rollers.
When it is desired to protect a window against the entrance of a burglar the 1
curtain is drawn down its full length and a ring f in the lower portion of the curtain
is then placed over a smooth pin a in the window frame, as shown in Figures 2
and 3.
The pawle which is provided at the other end with a perforation to which
is secured a chain or string e is then pulled down, rotating on its pivotal pin e
on the arm c³ to which it is attached until the opposite end or portion e' engages
with a pin co projecting out from the upper part of said arm c³, as shown in
Figures 4 and 7, and said pawl is then retained in this position, by placing a
ring on the end of the chain or string over the pin or hook a¹ on the
side of the window frame, as will be evident from Figure 2.
Now, if a person raises the window and attempts to enter, the curtain will be
pushed inward and the ring f disengaged from the pin a in the lower part of the
window frame.
Owing to the raised position of the pawl e, the curtain will rapidly wind itself
upon its spring roller until the end is reached and the rapid revolutions of the cam d
causes the hammer c' and its arm c* to vibrate very quickly, and to strike the gong
in rapid succession with considerable noise to warn the inhabitants of the building
of the entrance of an undesired visitor.
The pin fis of such a construction that the least push against the curtain will
free the same and cause it to rise, or, if it should be cut across its width by the
person entering, it will suddenly be wound up and cause an alarm to be sounded on
the gong.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :
1. The combination, with a shade roller, of a bracket provided with an alarm
and means operated from said roller to strike said alarm, as and for the purposes
set forth.
2. The combination, with a shade roller, of a bracket provided with a gong and
an arm on said bracket having a hammer on one end, and a cam on said shade roller
for vibrating said hammer, as and for the purposes set forth.
3. The combination, with a shade roller having a cam attached to one end and
said cam being provided with a notch or stop, of a bracket, consisting essentially of
a base and a gong thereon, a bracket arm c¹ on said base provided with an arm c³,
and a pawl on said arm adapted to engage with said notch or stop on the cam, as
and for the purposes set forth.
4. The combination, with a shade roller having a cam attached to one end, and
said cam being provided with a notch or stop, of a bracket, consisting essentially of
a base and a gong thereon, a bracket arm c on said base provided with an arm o³,
and a pawl on said arm adapted to engage with said notch or stop on the cam, a
chain or string attached to one end of said pawl to raise the other end out of
engagement with said notch or stop, and a pin on said arm e' to limit the movement
of said pawl, as and for the purposes set forth.
5. The combination with the window frame, of a shade and shade roller, pivoted
at one end in a bracket provided with an alarm, means for operating the same, when
the shade roller rotates in its bearings, and a device at the lower end of the shade

page_text: for removably securing the same to the window frame, as and for the purposes set
forth.
Deted thie 14th day of October 1891
ISAAC LEVIT SILVERBERG.
MOSES REICHMAN.
GUSTAVUS TROXLER, Jr.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicants.