A NEW OR IMPROVED ALARM LOCK
Year: 1886

page_text: I, URS VICTOR JAEGGI of Auburn in the Province of South Australia Watch-
maker do hereby declare the nature of my invention for A NEW OR IMPROVED
ALARM LOCK 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 alarm locks for doors safes
or other purposes whereby the mechanism actuating the alarm is greatly simplified
and the cost of its construction materially decreased.
In order to accomplish this I dispense with the use of springs and actuate the
alarm by means of a lever connected with the bolt and latch of the lock. This
lever is so placed that neither the latch nor the bolt can be disturbed without
sounding the alarm. Forming part of the lever or attached to it is a rack which
by means of a pinion actuates a scape wheel and pallets and through them a
hammer and bell in the ordinary manner. The pinion of the scape wheel being
attached to a clutch kept in position by a circular spring can be thrown in and out
of gear by a forked lever projecting from the side of the lock case.
By reference to the accompanying drawings it will be seen that:-
Fig. I is a view of the internal mechanism the bolt of the lock being shown as if
transparent in order to discover the parts more clearly.
Fig. II a side view of the alarm shewing the clutch and lover.
F a
A (Fig. I) is the lock case. B the bolt having a stud B¹ projecting inwards.
C the latch. D the socket of the handle bar. E a flat spring actuating C.
lever pivotted at G and constructed with a rack H and a raised socket I. Ka rod
passing through C, against the upper surface of which its head rests, and connected
at its lower end by means of a pin to the socket I. L a spring actuating the
lever F. Ma stud on lock case retaining F in position. N the scape wheel of the
alarm provided with a moveable pinion attached to a clutch and spring lever.
O the pallets with hammer attached. P the bell. the bridge attached to the
lock case.
.
Fig. II shews the alarm movement more clearly. H as before is the rack.
N the scape wheel fixed to an arbor pivotted in the lock case and the bridge Q.
R a movable pinion actuated by the rack H. S a clutch half of which is
attached to the scape wheel N and a half to the pinion R. Ta notched spring
lever pivotted on a stud attached to the lock case through the side of which its
outer end projects so that the pinion can be thrown in or out of gear at pleasure.

page_text: The action of my alarm lock is exceedingly simple. The alarm being thrown
into gear the handle and through it the handle socket D being turned will raise
the latch C drawing up the connecting rod K. This as before described being
attached to the rack lever F will raise it and causing the scape wheel N to revolve
will sound the alarm. As soon as the handle is released the springs E and L will
return the latch and lever F to their former position of rest at the same time
again sounding the alarm.
.
The stud B projecting inwards against the side of the raised socket I renders it
impossible to move the bolt either in unlocking or locking without first raising the
lever F. F it will be noticed is constructed with a lower projection whereon the
key presses and raises the lever on being turned. As soon as the lever F is raised
the socket I will allow the stud B₁ to pass and the operation of locking or
unlocking can be completed. The socket I and the stud B should extend
sufficiently low that when the lever C is raised the bolt B is still retained in
position, the length of the rod K being similarly adjusted. The alarm meanwhile
sounds as the lever F rises or falls. The rod K passing through C allows the lever
to rise without raising the latch. By actuating the lever T the clutch is thrown
out of gear and the pinion K will revolve without actuating the scape wheel N.
Should the latch C be raised suddenly or violently the clutch is so set as to rise
out of gear and allow the pinion to revolve thus preventing breakage of the parts.
The alarm will then not sound in the upward motion but only in the downward.
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
First. The entire mechanism as a combination of parts substantially as herein
described.
Second. In the construction of alarm locks the arrangement of the parts so that
the latch and bolt actuate the alarm independently or together in the manner
described.
Third. In the construction of alarm locks the lever For its equivalent sub-
stantially as herein described.
Fourth. The combination with the lever F of a rack H actuating the pinion N.
Fifth. In the construction of alarm locks the construction of the stud B¹ and the
socket I so that the bolt B is retained in position when the latch C is raised
substantially as herein described.
Sixth. The combination with the lever F of a stud I forming a socket for K and
a stop for the bolt B.
Seventh. In the construction of alarm locks the rod K or its equivalent for the
purpose indicated.
Eighth. The combination of the rod K with the latch C and the lever F
substantially as herein described.
Ninth. The alarm as a combination of the parts A. N. O. P. Q. R. S and T
substantially as herein described.
Dated this Second day of January 1886.