Burglar and other Alarms.
Year: 1888

page_text: Date of Application, 26th Oct.. 1888
Complete Specification Left, 17th..June, 1889-Accepted, 20th July, 1889
Burglar and other Alarms.
I LEONARD FALKNER LAMKIN of 68.Blackstock Road, Finsbury Park N.
"Electrician" do hereby declare the nature of this invention to be as follows:-
This Invention consists of a. combination of apparatus for the production of
Burglar and other Alarms.
•
I employ an Indian Rubber air bag; elastic Bladder; or Bellows (hereafter referred
to as an air chamber) filled with air and fitted with a tube containing a reed or other
musical note making device, so that the aforesaid air chamber when emptying itself
must do so through the reed or musical note making device actuating same and giving
the alarm.
The emptying of the air chamber is controlled by means of a tap or valve having an
elongated handle; or a lever; so arranged that on being placed in close proximity to
any moveable article the movement of which it is desirable should be announced-such
as a "Door" "Window" "Shutters" &c.—the movement of same causes the opening
of the valve or tap allowing the air to escape and the sound produced as before
described.
The Bellows may be fitted with a spiral or other spring (or springs) fixed between
the two faces in such a manner that the spring (or springs) would have the tendancy
to draw the two faces together thereby discharging the air. The Bellows is filled with
air by simply drawing the two faces apart against the tension of the spring (or springs)
the air entering at a valve.
I employ as a special device for checking the emptying of these Bellows a moveable
knee-joint having its ends jointed to the sides of the faces of the Bellows (similar to
the opening of a clasp knife) when the Bellows is full of air it opens or extends the
knee-joint until the three joints are in line, in this position the air in the Bellows
cannot be exhausted until the middle joint is moved or pushed out of line which may
be done by the movement of anything such as a
Door,' Window," "Shutters," &c.
[
I may employ as a means of checking the exhausting of the air chamber an electro
magnet so arranged that an electric current when passing through it would actuate the
armature of the electro magnet and open the valve or tap, or bend the jointed knee,
thus allowing the air chamber to exhaust itself through the musical note making
device as before described.
I claim this combination of apparatus as an alarm substantially as herein described.
12
11
31 1
1000
LEONA
ANADD WAT NED LAMKIN
COMPLETE SPECIFICATION.
Burglar and other Alarms.
I, LEONARD FALKNER LAMKIN, of 68 Blackstock Road, Finsbury Park, N. do
hereby declare the nature of this invention and in what manner the same is to be
perforined to be particularly described and ascertained in and by the following state-
ment:-
This invention consists of a combination for the production of burglar and other
alarms.
I employ an india rubber air bag; elastic bladder, or bellows (hereafter referred to
as an air chamber) filled with air and fitted with a tube containing a reed or other
musical note-making device so that the aforesaid air chamber when emptying itself
must do so through the reed or musical note making device actuating same and giving
the alarm.

page_text: The emptying of the air chamber is controlled by means of a tap or valve having a
elongated handle, or a lever, so arranged that on being placed in close proximity to an
moveable article the movement of which it is desirable should be announced "suc
as a door," "window," "shutters &c." the movement of same causes the opening
of the valve or tap allowing the air to escape and the sound produced as before
described.
The "hellows" may be fitted with a spiral or other spring or springs fixed betweer
the two faces in such a manner that the spring would have the tendency to draw the
two faces together thereby excluding the air. The bellows is filled with air by simply
drawing the two faces apart against the tension of the spring or springs, the air
entering at a valve.
I may employ as a special device for checking the emptying of these bellows a
moveable knee joint having its ends jointed to the sides of the faces of the bellows
(similar to the opening of a clasp knife) when the bellows is full of air it
or extends the knee joint until the three joints are in line, in this position the air in
opens
the bellows cannot be exhausted until the middle joint is moved or pushed out of line,
which may be done by the movement of anything such as a
"shutters &c."
door" "window
66
"2
I may employ as a means of checking the exhausting of the air chamber an electro
magnet so arranged that an electric current when passing through it would actuate the
armature of the electro magnet and open the valve or tap, or bend the jointed knoc
thus allowing the air chamber to exhaust itself through the musical note making device
as before described.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed,
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation, Figure 2 is a front elevation and Figure 3 a plan of an
apparatus constructed according to my invention.
A is an air bag or bladder which carries at its mouth the reed B, the opening being
closed by the valve C pressed outwards by the spring Cand actuated by the rod (
D is the mouth-piece by which the bag can be filled. E is a spring lever pivotted at
E, it is held out of contact with the rod by the short arm of the lever F whose other
end is placed against the door G or other part whose movement is to be notified.
When any movement takes place the lever is turned about its pivot freeing the
spring lever E which then presses upon the rod (and opens the valve, allowing air to
escape and thereby producing a musical sound.
Figure 4 shows a side elevation of an apparatus in which the air bag is replaced by
bellows, the latter being inflated.
Figure 5 shows the same arrangement with the bellows empty.
A are the bellows and A¹ is a spiral spring which tends to close them and expel the 4
air through the reed Band trumpet B. G and H are levers jointed at the top and
bottom respectively to the bellows; they are actuated by the push rod J. When the
lever G and H are in a line with each other they keep the bellows distended, but when
they are deflected the spring A¹ comes into operation and expels the air. K is a
handle by which the bellows can be pulled out again.
Figure 5 shows a side elevation of the same arrangement in which the rods Gand
H are actuated by the closing of an electric circuit through the magnet L whose
armature MI is attached by a cord to the joint between the rods.
If it is desirable to obtain a greater pressure of air within the bellows it may be
pumped in.
In this case a valve must be placed at the mouth to prevent its escape. 5
This valve may be actuated by the same electric circuit as that which actuates the
maguet L for deflecting the rods G and H. This arrangement is shown in Figure 6.
The electric circuit can be closed by an 'apparatus similar to that shown in Figure 1
the air bag &c. being omitted the upper end of the spring lever E actuating a contact
maker or itself forming the contact maker.
55

page_text: 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 combination of an air chamber, a reed or other musical note making device
and mechanism in connection with the part whose movement is to be indicated con-
trolling the escape of air from the air chamber.
2. The apparatus substantially as described and shown in the drawings.
L. F. LAMKIN.