A New or Improved Burglar Alarm, Detector, or Appliance for Indicating the Opening of Windows and other Sliding Frames.
Year: 1887

page_text: Date of Application, 23rd June, 1887.
Complete Left, 18th Aug., 1887.
Complete Accepted, 20th Sept., 1887.
A New or Improved Burglar Alarm, Detector, or Appliance for
Indicating the Opening of Windows and other Sliding Frames.
I, ROBERT WILLIAMS GAMBLE of 1 Osborne Road, Wood Grange Road, Forest
Gate, in the County of Essex, Warehouseman do hereby declare the nature of this
invention to be as follows:-
The object of my invention is to provide simple and efficient means as hereafter
described for indicating the opening of windows and other sliding frames.
According to my invention I place an alarm apparatus on the inside of the window
sash frame, and operate such alarm by the movement of the sashes.
A convenient way of carrying my invention into effect is as follows:
I provide a metal case or box which is fitted into the sash frame of the window.
This box contains a tooth wheel which is in gear with a rack extending from end to
end of the window frame so that as the window sash frames move up or down rotary
motion is communicated to the toothed wheel before mentioned. The spindle of this
toothed wheel carries a pinion in gear with another wheel on a spindle which carries
the spoke or other wheel for communicating an intermittent motion to the arm of a
hammer for striking a gong which latter is carried by a plate forming one side of the
box in which the whole apparatus is fitted. There is a slot in this plate in which the
gong spindle can be made to slide when required and its position adjusted by a screw
and spring at the back in such manner that the gong may be put out of action when
required.
The alarm apparatus may be fitted in any convenient position in the inside sash
frame of the window and suitably connected to top or bottom sash and consequently
cannot be tampered with from the outside; the rack is covered by the beading, and
the alarm apparatus by a plate in accordance with the window or to suit fancy,
according to circumstances.

page_text: A New or Improved Burglar Alarm, Detector, or Appliance for
Indicating the Opening of Windows and other Sliding Frames.
I, ROBERT WILLIAMS GAMBLE, of 1 Osborne Road, Wood Grange Road, Forest
Gate, in the County of Essex, Warehouseman 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 simple and efficient means as hereafter
described for indicating the opening of windows and other sliding frames.
According to my invention I place an alarm apparatus on the inside of the window
sash frame, and operate such alarm by the movement of the sashes.
A convenient way of carrying my invention into effect is as follows:
I provide a metal case or box which is fitted into the sash frame of the window.
This box contains a tooth wheel which is in gear with a rack extending from end to
end of the window frame so that as the window sashes move up or down rotary
motion is communicated to the toothed wheel before mentioned. The spindle of this
toothed wheel carries a pinion in gear with another wheel on a spindle which carries
the spoke or other wheel for communicating an intermittent motion to the arm of a
hammer for striking a gong which latter is carried by a plate forming one side of the
box in which the whole apparatus is fitted. There is a slot in this plate in which the
gong spindle can be made to slide when required, and its position adjusted by a screw
and spring at the back in such manner that the gong may be put out of action when
required.
And in order that my invention may be fully understood I will further describe
same with reference to the accompanying drawings, similar letters of reference
referring to like parts in all the figures.
Figure 1 is a front sectional view of the alarm apparatus constructed according to
my invention and applied to a sliding window of ordinary construction, the cover of
the apparatus and parts of the window framework have been removed in order to
shew the acting mechanism clearly; Figure 2 is a vertical cross section of the box or
case shewing the mechanism therein. Figure 3 is a front view of the cover separately,
and as removed from the box or case shewn at Figure 1. Figure 4 is a horizontal

page_text: section shewing the connection of the lower sash with the alarm mechanism, and
Figure 5 is a horizontal section shewing the connection of the upper sash with the
alarm mechanism.
a is the metal case or box provided with a lid a' shewn separately at Figure 3,
the said box a being sunk and fitted into the box of the sash frames as shewn at
Figures 1, 4 and 5, and by being so fitted and arranged according to my invention
that is on the inside of the said guiding framework the apparatus is thus placed
beyond reach from the outside of the window and cannot be tampered with. b is the
toothed wheel in gear with the rack c fixed to, and extending from top to bottom of
the lower window sash s¹, or nearly so; d is the spindle on which the wheel b is fixed
and on which is also fixed the pinion e gearing with the toothed wheel on the
spindle g bearing on the case a, a'; h is the spoke or armed wheel fixed on the
spindle and is for communicating intermittent motion to the arm k_carrying
the hammer ; m is the gong adjustably carried on the lid or cover a¹; n Figures 2
and 3 is the slot in the lid a' in which the spindle of the gong m may be adjusted ;
n' is a thumb screw by which the gong spindle may be fixed in position in the slot
when adjusted.
When an alarm apparatus according to my invention is to be fitted to a double
sliding sash as in the accompanying drawings that is to say to a window composed
of an upper sash s² which may be slid downwards and a lower sash which may be
slid upwards each sash is fitted with a rack as shewn at c, c¹ Figures 1, 4 and 5,
and the case or box a, a' is fitted with two similar sets of gear wheels and mechanism
the set for the lower sash s¹ being marked on the annexed drawings b to and the set
for the upper sash to . The spindle d' carrying the gear wheel for the rack c¹ on
the upper sash is lengthened in order to reach behind the lower sash s' as shewn at
Figures 2 and 5 to gear with the rack c¹. Both of the hammers and act on the
same gong m.
The action of the apparatus is as follows: The lower sash s¹ being raised or the upper
sash lowered will, through the racks c or c¹, cause the rotation of gear wheels b or b¹
which through gearing e, for ef¹ will rotate the spoke wheels h or h¹ act on the
arms or and vibrate the haminers or land cause the gong to sound an alarm.
I generally provide the arms k, k' at or near the ends where they engage with the
spoke wheels h, ' with ends or pawls k², 2x knuckle jointed to the said arms k, k¹ in
such manner that when the spoke wheels h, h' are revolved in the direction shewn by
the arrows the arms k, k² are acted upon and the gong is struck, but when the
window sashes are being closed and the spoke wheels rotated in the reverse direction
the ends or pawls will turn on their pivots or joints and allow the spoked
wheels to pass without the gong being struck.
When the window is to be cleaned or when for other reasons it is not desired that
the alarm should sound when the window sash or other frame to which this apparatus
is fitted is moved or "slidden" the thumb screw securing the gong to the box is
loosened and the gong is slid to the left hand of Figure 1 where the hammers will not
reach it. As in some cases it is not desirous that this means of silencing the alarm
should be available to servants or other persons 1 sometimes mount the gong m on a
sliding bolt which may be shot backwards or forwards in the slot n by means of a key,
and the said sliding bolt being similar to an ordinary door lock bolt, the alarm gong m
could not be placed out of action without such key.
The box a, a' may be covered by an ornamental metal or other plate the position
of which is shewn at p Figures 4 and 5, and the apparatus may be fitted in any
convenient position in the inside of the frame.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1. The application of burglar alarms, detectors or appliances fitted onto the inside
of the guiding framework of windows or other sliding frames, and acting on a
gong, its equivalent or substitute, for the purpose of indicating the opening of the
said windows and other sliding frames substantially as herein set forth.

page_text: 2. In burglar alarms, detectors or appliances connected therewith, the combination
and arrangement of the parts thereof, essentially consisting of, the rack e, gearing b,
and spoke wheel h, arm k, k², hammer and gong m with or without the means
described for throwing same out of action, such apparatus being fitted inside the
window sash or other framework, for the purpose of indicating the opening of windows
and other sliding frames substantially as and for the purpose herein described with
reference to the accompanying drawings.