An Improved Lock with Sub-divided Key.
Year: 1889

page_text: Date of Application, 21st Oct., 1889
Complete Specification Left, 21st July, 1890-Accepted, 6th Sept., 1890
PROVISIONAL SPECIFICATION.
An Improved Lock with Sub-divided Key.
I, JULIUS VON SZÉcsy of Kún-Szt-Miklós in the Kingdom of Hungary, Engineer,
do hereby declare the nature of my invention for AN IMPROVED LOCK WITH SUB-
DIVIDED KEY to be as follows:-
The locks at present in use possess the great disadvantage that wax impressions can
be easily made of the keys from which said impressions duplicate keys for illegal
purposes can readily be made and the locks opened by means of the same.
Not even
the best and most approved locks, such for instance, as the Wertheim locks, are
sufficiently protected against such misuse, whereas with the ordinary locks an impression
can be taken from the lock itself besides which these primitive locks can be readily
opened by means of false keys.
The object of the present construction is to prevent wax impressions from being
taken and to render the picking of the lock impossible by means of false or skeleton
keys.
The key of my improved lock consists of two parts, of which the part provided with
the bit remains constantly in the casing of the lock so as to be readily turned in
bearings in the walls of the lock casing. This part of the key runs through a wall of
the casing into the interior of a boss or ring and is laterally extended so as to form a
disc, a peg or pin projecting outwards from the centre of the said disc. The edge of
this disc is provided with an appropriate number of recesses arranged nearer or further
apart, and of appropriate size and depth.
The other half or part of the key carries, instead of the usual bit, a disc-like head
which is appropriately recessed so that its projections will fit exactly into the recesses of
the disc whereas the stem of the key is bored to receive a suitable pin. In this manner
the bit end of the key arranged in the lock casing can only be turned when the recesses
and projections of the other part of the key correspond exactly with like parts in the
disc of the key in the lock casing.
In order to render the gear of the two parts of the key more sensitive and to
preclude the possibility of opening the lock by cleverly arranged pegs or pins or by
false keys, a second casing may be employed and pins or pegs arranged in the same,
which are continually pressed from the rear by springs into the recesses of the disc, so
that the same will only retire into the interior of the lock casing when the said pins or
pegs are pressed inwards by the projecting parts of the key.
The inner construction of the lock can be modified according to the various con-
structions of locks.
Dated this 21st day of October 1889.
COMPLETE SPECIFICATION.
An Improved Lock with Sub-divided Key.
I, JULIUS VON SZÉcsy, of Kún-Szt-Miklós, in the Kingdom of Hungary, Engineer,
do hereby declare the nature of my said invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:—
The locks at present in use possess the great disadvantage that wax impressions can
be easily made of the keys, from which said impressions duplicate keys for illegal

page_text: purposes can readily be made and the locks opened by means of the same.
Not even
the best and most approved locks, such for instance as the Wertheim locks, are
sufficiently protected against such misuse, whereas with the ordinary locks an impression
can be taken from the lock itself, besides which these primitive locks can be readily
opened by means of false keys.
The object of the present construction is to prevent wax impressions from being
taken, and to render the picking of the lock impossible by means of false or skeleton
keys. This construction of lock is shown in the accompanying drawings, in which
Figure 1 represents my lock in side view, a portion of the casing being broken
away to better illustrate the interior of same.
Figure 2 is a front view of the lock, partly in section, showing the stationary part A
Figure 3 is a view of the movable part B of the key.
Figure 4 an exterior view of the lock.
Figures 5 and 6 represent in section and front view a more simple device.
Figure 7 shows the movable part B of the key employed in this more simple locking
device.
Figure 8 represents a modification.
The key of my improved lock consists of two parts, A and B, of which the part A,
provided with the bit, remains constantly in the casing of the lock C, so as to be readily
turned in the bearings in the walls c, c¹ of the lock casing. This part of the key runs
through the wall of the casing into the interior of a boss or ring D, and is laterally
extended so as to form a disc a, a peg or pin al projecting outwards from the centre of
the said disc. The edge of this disc a is provided with an appropriate number of
recesses b arranged nearer or further apart, and of appropriate size and depth.
The other half or part of the key carries, instead of the usual bit, a disc-like head b³,
which is appropriately recessed, so that its projections & will fit exactly into the recesses
of the disc a, whereas the stem of the key is bored to receive the pin a².
In this manner the part A of the key arranged in the lock casing can only be turned
when the recesses and projections of the head of the other part B of the key corre-
spond exactly with the like parts in the disc a of the part A of the said key. In order
to render the gear of the two parts of the key more sensitive, and to preclude the
possibility of opening the lock by cleverly arranged pegs or pins, or by false keys, a
second casing E, Figure 8, may be employed and pins or pegs F arranged in the same,
which are continually pressed from the rear by the springs G into the recesses of the
disc a, so that the same will only retire into the interior of the lock casing when the
said pins or pegs are pressed inwards by the projecting parts 62 of the part B of
the key.
By means of this device the lock cannot be opened by false keys or by means of
nails or the like, for the reason that if the bit of the key or the nails are inserted, only
a trifle deeper than necessary, the same will penetrate into the borings E in the casing,
whereas when the same, i.e. the false key or nails, are only a trifle shorter, the pins or
pegs will not be pressed entirely out of the recesses 6 in the disc A.
In both cases it is entirely impossible to turn the key A. The inner construction of
the lock can be modified according to the various constructions of locks.
It may be remarked that the gear of the two parts of the key is facilitated by the
key A in consequence of the weight of the bit always occupying a vertical position.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
1-A lock with key made of two parts A, B, one part A of which remains
permanently within the casing of the lock and has at its protruding end the form of a
disc a with variously combined recesses, whilst the second part B has, instead of a bit,
a disc-like head with projections corresponding to the recess in the disc a, so that

page_text: the lock can only be operated when the two parts A, a, and B, b¹, fit into each other,
substantially as specified and shown.
2: My improved lock and key, substantially as described in the foregoing specifi-
cation, and illustrated in the accompanying drawings.
Dated this 21st day of July 1890.
W. P. THOMPSON & BOULT,
Agents for the Applicant.