Improvements in Looks and Latches.
Year: 1899

page_text: Date of Application, 14th Nov., 1889
Complete Specification Left, 14th Aug., 1900-Accepted, 14th Feb., 1901
Improvements in Looks and Latches.
I, HENRY HARINGTON LEIGH, Assoc. M. Inst. C.E., Fel. Ch. Inst. P.A., F.I. Inst.,
practising as Phillips and Leigh, of No. 22, Southampton Buildings, Chancery
Lane, in the Administrative County of London, Engineer and Patent Agent, do
hereby declare the nature of this invention (a communication from Hans
Mollenhauer, of Zwinglichenstrasse 22, and William Mayer, of Potsdamerstrasse
121, both of Berlin, in the German Empire) to be as follows:-
This invention relates to improvements in locks or latches and the object of it
is to provide for the use of a false key, pick lock or the like, ringing an alarum.
In carrying the invention into effect, there is mounted within the lock or latch
case, a special device which is capable of turning upon a suitable pivot and which
presents itself in the path which the bit of the fraudulent key must take from
the key hole to the bolt.
In the locks to which my invention is applicable the front edge of the key bit
is slotted or stepped, as is the case with the key bits of lever locks, and the
device is circular in plan, to correspond with the circular path of the key bit, and
presents a circular plate in the path of each slot or notch in the front edge of the
key bit, and a clear space in the path of each lever or bolt actuating step on the
said bit.
It is obvious then, that the bit of the proper key will clear the device above
mentioned and get at its work without impediment, and that a fraudulent key,
or a pick lock, will be prevented reaching the bolt or its levers or tumblers by the
special device.
The latter, is capable of a certain amount of circular motion. It carries a
projection which is forced up against an alarum, by the fraudulent key or pick
lock above mentioned. The alarum may be either mechanical or electrical, or a
combination of both, so long as the motion of the projection can engage it and
start it ringing.
T
1000

page_text: Mollenhauer, of Zwinglichenstrasse 22, and William Mayer, of Potsdamerstrasse
121, both of Berlin, in the German Empire), and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
The present invention relates to improvements in locks and latches and the
object of it is to provide an improved device applicable to any lock or latch case
already made or hereafter to be made, which device shall audibly announce the
insertion and use or attempted use, of a false key or pick to open the said lock.
Referring to the accompanying drawings which are to be taken as part of this
specification and read therewith:-
Figure 1 is an elevation of the inside of a door having a mortise lock fitted
with the improved safety device:
Figure 2, a similar view after parts of the door and of the inside side plate
have been broken away; and
Figure 3, a plan of the improved safety device.
a is a lock bolt; b, its levers; c, their springs; d, the key hole; and e, the web
of the proper key. The improved safety device consists of a ring s, standing
nearly around the key hole d but eccentric to the path of the proper key as shewn
in Figure 2, in which the said path is indicated by the dot and dash line t. The
rings is fast to one ond of a bar u the opposite end of which is fast to a rod 7.
This latter stands at a right angle with the bar w, turns in bearings in the side
plates i, i¹, and projects through the plate and the door. m is an arm fast
by one end on the projecting end of the rod at about a right angle therewith.
7 is a stud depending from an alarum o as far as the outer end of the arm m.
This stud n is in operative connection with the alarum trigger to release the
same by being pressed upwards.
Figure 3 shews the use of the proper key which moves through its path without
its nose touching the inner face of the rings, but a false key or a pick lock would
engage with that face and rock the bar u, thereby turning the bar and the arm m,
to sound the alarum v.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed, I declare that what
I claim is:
-
The hereinbefore described combination with a bolt actuated by a key, of rings,
bar u, rod, arm stud » and alarum
Dated thin 05ndo To 1001
nd day of Tenuary 100%
HENRY H. LEIGH, C.P.A.,
22, Southampton Buildings, Chancery Lane, London, W.C.
HENRY H. LEIGH, C.P.A.,
22, Southampton Buildings, Chancery Lane, London, W.C.