Improved Safety Signalling Lock for Doors, Safes, Strong Boxes, Drawers, and other Purposes.
Year: 1888

page_text: Improved Safety Signalling Lock for Doors, Safes, Strong Boxes,
Drawers, and other Purposes.
I, CHARLES ACCIOLI DE AZEVEDO BASTO of Rio de Janeiro, Brazil, Student, 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:-
My invention relates to an improved construction of lock which shall give a
signal or alarm when opened, without possibility of preventing the signal from
sounding:
For this purpose the lock is constructed with a metal casing enclosing the whole
mechanism and having an accurately fitting cover secured by screws screwing into
lugs on the box.
The mechanism is actuated by the key of the lock, which has teeth actuating two.
or more safety plates or tumblers, and which shoots the bolt of the lock with two or
three turns, at the same time winding up the movement of the alarm, this being
prevented from acting at that time on account of the hammer which strikes the bell
being held by a catch. As soon however as the bolt is unlocked, its backward move-
ment disengages the catch from the hammer and the alarm is at once put in action so
as to draw attention to the fact.
The accompanying drawing shews the construction of the improved lock, Fig. 1
shews a front view of the complete lock, Fig. 2 is an edge view of the same,
Fig. 3 shows the back side of the lock, shewing the cover and part of the bell. Fig. 4
shews the lock without the cover, shewing the mechanism of the alarm. Fig. 5 shews
an edge view of the mechanism, Fig. 6 is a similar view to Fig. 4, the plate S
being removed. Figs. 7, 8 and 9 shew views of detached parts of the mechanism and
of the key.
In these figures A is the casing of the lock A¹ the cover, L the bolt, B the key-hole
plate, fixed on studs 16 by means of screws a a¹. The key C Fig. 9 has a tubular
stem, which fits over the guide pin c', and it has two lateral slots into which take two

page_text: small cross bars c connecting the guide pin c¹ to small bars c³, one above and the
other below, so that no other key can be passed in.
These bars are threaded and rivetted to the small steel ratchet wheel D, which is
thus made to partake of the rotary movement of the key.
The action of the key in lifting the tumblers F into position for allowing the stud f
of the bolt to pass while at the same time it acts on the teeth of the bolt for shooting
the same, is well-understood. When the key is turned in the direction for locking and
at the same time turns the ratchet wheel D as described, the latter carries with it the
toothed wheel E, this being connected to D by small pawls & pivotted to E and
pressed against the teeth of D by springs ', as shewn at Fig. 7. On turning the key
and wheel D in the contrary direction the pawls slide over the teeth of the latter so
that the wheel E is not turned. The guide pin el passes through the support G and
is screwed into a screw-nut or washer secured by a pin entering a notch. The
wheel E gears with the wheel H fixed on the axis of the barrel / containing the coiled
spring that actuates the alarm the inner end of the spring being connected to the axis
so that this spring is wound up by the above described action of the key in locking.
The axis of the barrel to which the inner end of the spring is connected also carries a
smalt ratchet wheel I shewn at Fig. 8, with which gears a pawl with spring i¹ so
that the spring is thus held in the wound position for causing the rotation of the
barrel. This carries a wheel I gearing with the steel pinion on the same axis with
a wheel K, the rotation of which causes the movement of the cam 7 carrying the arm
of the hammer M which is thus made to sound the bell N with a succession of rapid
strokes during the whole time that the barrel, when liberated, is rotated by the
unwinding of the spring. This movement can however not take place during and
after the locking of the bolt, as the arm of the hammer is held by a stud o thereon
catching against a projection o¹ on the slotted plate P while the key is being turned
twice for locking. The bolt having then been shot a certain distance, the small
plate P which is rivetted to the bolt at p' and which consequently moves with it,
engages by means of the hooked piece P³ pivotted to P2 at p² with the pin p³ on the
lever.P pivotted at This lever is connected at one end to the sliding plate P, so
that as the lever. P❞ has its other end count ou the direction of the arrow by the hook
of P³ while the bolt is being shot during the first two turns of the key, the plate P is
moved in the opposite direction so as to bring the projection o¹ in front of the stud o
and so prevents the hammer from being actuated by the spring while this movement
is taking place. When the bolt is shot to its extreme outward position by the third
turn of the key a projection on the upper end of of the hammer arm catches against a
projection on the plate P2, and the hammer is now held by this piece. At the same
time the pin p³ on the lever P will have slipped off the hook of P³, whereupon the
springs QQ fixed at R R¹ and acting respectively on the slide P and lever P, will
bring these parts back to their original position, in which the stud o is free of the
projection of, the hammer being however still held by the plate P2, and consequently
prevented from being actuated so long as the bolt is shot. But as soon as the key is
turned in a contrary direction so as to shoot back the bolt, the plate P2, in moving
back releases the hammer arm, and consequently this is made to strike the bell by the
clockwork as above described.
The axes of the wheels are carried at one end by the casing A and at the other end
by the plate S which is carried by three columns S S¹ S², to which it is secured
by pins.
"
Fig. 7 shews a plan and side view of the ratchet wheel D and wheel E and parts in
connection therewith; Fig. 8 shews the plate S with the ratchet wheel I and
spring pawl i i.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is-
1. The combination, with a lock of an alarm or signalling mechanism actuated by

page_text: in locking, in order that the alarm may be sounded by the action of the clockwork on
unlocking, substantially as herein described.
2. The combination with a lock of a clockwork alarm or signalling mechanism the
spring of which is wound up by the act of locking, and which is held in the locked
position until it is released by the backward motion of the lock bolt in unlocking.
3. The construction of alarm mechanism arranged and operating in combination
with any construction of lock substantially as herein described with reference to the
accompanying drawings.
D
1000
ABEL & IMRAY,
Agents for the Application.