Year: 1888

page_text: W. P. THOMPSON & BOULT,
Agents.

page_text: A communication from SAMUEL GOULDEN, Jeweller, and JOSEPH CLARKE, Merchant,
both of the City of Toronto, in the County of York, in the Province of Ontario,
Canada.
1, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex, M.I.M.E.
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 the invention is to design a simple burglar alarm which may be carried
by travellers, readily and easily applied, and which will give a sufficient alarm should
the door to which it is applied be tampered with; and it consists, essentially of a plate
provided with suitable feet and arranged to support a bell and its ringing mechanism
a longitudinally sliding bar being connected to the plate and bell mechanism in such a
manner that the longitudinal movement of the bar will cause the bell to ring and caps
to be exploded, substantially as hereinafter more particularly explained..
Fig. 1 is a perspective view of this improved burglar alarm applied to a door.
Fig. 2 is a similar view but partially in section and showing the position of the
mechanism when the bar is pushed in.
Fig: 3 is a bottom plan showing the connection between the bar and the spindle of
the movement for ringing the bell.
In the drawing A represents a plate provided with feot a designed to rest upon
the ground when the end of the bar B is rested against the door C it is intended to
protect.
On reference to Fig. 3 it will be noticed that the spindle D of the movement for
ringing the bell extends through a slot b made in the bar B and that a pin d fixed.to
the spindle D extends through an eye attached to the bottom of the bar. It therefore
follows that the longitudinal movement of the bar B will cause the spindle D to move
on its centre. The spindle D is provided with a spring E designed to turn the spindle
in the direction indicated by arrow so that the normal position of the bar B is that"
shown in Fig. 3.
When the alarm is placed in the position in which it is shown in Figs. 1 and 2, any
opening of the door pushes the bar B back in the direction indicated by arrows, which
movement owing to the connection described, will cause the spindle D to move on its
centre and as it is geared as shown to the spindle Fa very short movement of the bar B
will cause the spindle F to make several revolutions. On the top of this spindle F is
fixed a crank-disc G which is connected to the bell hammer arm H as indicated in
Figs. 1 and 2. This bell hammer arm is pivoted at e so that the revolving of the
crank-disc G will cause the hammer to strike the bell 1.

page_text: The end of the bar B and the points of the feet a are made so that they will force
their way into the door and floor when the pressure is directed against them; conse-
quently the greater the pressure against the door the more securely will the alarm
be fixed in position and as the slightest inward movement of the bar B will cause the
spindle F to revolve and agitate the bell hammer, any attempt at opening the door
will be instantly noticed.
As a further means of alarm on the plate A are pivotted two spring hammers, J,
designed to be knocked down one after the other by the T-bar, K, which is attached
to the bar, B, and moves with it. In Fig. 1 the bar B, bas been moved in sufficiently
to knock one hammer, J, down, while in Fig. 2 it has been moved in far enough to
knock both hammers down; the falling of the hammers being arranged to explode
caps, so that in addition to the ringing of the bell, the occupant of the room will be
alarmed by the explosion of the caps.
From this description it will be seen that this alarm can be easily made, can be
readily carried in a satchel, and can be placed in position without the slightest
difficulty.
Having now particularly described and ascertained the nature of this said
invention as communication to me by my foreign correspondents, and in what
manner the same is to be performed I declare that what I claim is,
1. A plate provided with suitable feet and arranged to support a bell and its
ringing mechanism, in combination with a longitudinally-sliding bar adjustably
connected to the bell mechanism in such a manner that the longitudinal move-
ment of the bar will cause the bell to ring, substantially as and for the purpose
specified.
2. A plate provided with suitable feet and arranged to support a bell and its
ringing mechanism, spring hammers J, pivotted upon the plate, in combination with
a longitudinally-sliding bar connected to the bell mechanism in such a manner that
the longitudinal movement of the bar will cause the bell to ring, a T-bar K, con-
nected to the said bar, arranged to strike the spring hammers on the longitudinal
movement of the bar, substantially as and for the purpose specified.
3. A plate, A, provided with suitable feet, a, a bar B, adjustably connected to
the said plate, and having a slot, b, made in it through which the spindle, D, pro-
jects and is connected to the bar B by the pin d, as described, in combination with
the bell-hammer arm H, pivotted at e, and operated by the crank disc, G, connected
to the spindle F, which is geared to the spindle D, deriving motion therefrom upon
the longitudinal adjustment of the bar B, substantially as and for the purpose
specified.
4. The plate, A, provided with suitable feet, a, and having pivotted upon it the
spring hammers, J, in combination with the bar B, having attached to it the T-bar K,
arranged to strike the spring hammers, J, upon the longitudinal adjustment of the
bar, B, substantially as and for the purpose specified.
Dated this 3rd day of July 1888.
W. P. THOMPSON & BOULT,
Agents.