Year: 1888

page_text: Date of Application, 7th Sept., 1888
Complete Specification Left, 28th Nov., 1888
Complete Specification Accepted, 22nd Jan., 1889
A communication from DT. FRIEDRICH MICHE, Of Schandau-Sachsenburg, in the
Empire of Germany, Dentist.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention to be as follows:-
The object of the present invention is to provide locks of all kinds with a safety
closing device which will effectually prevent them from being picked or opened
after being locked and the key withdrawn.
Most locks and especially those manufactured wholesale with tubular keys or
keys with solid shanks can be unlocked with more or less difficulty with master-
keys or picked with skeleton keys, hooks and the like and offer therefore little
security against burglarious entrance and theft.
By this invention however each. lock can be secured against being picked by
the introduction into the keyhole of a safety closing device which is adjusted by
a small key (kept by the owner) in such a manner that it cannot be removed.
without the help of this small key. The form of this small key is different for
every lock and is intended to be kept secret by the owner; the form of the
device also differs for locks with tubular keys from those with keys having solid
shanks.
The closing devices for locks with keys having solid shanks consist of a sleeve
formed with transverse slots and in which turns a core or plug provided with a
key bit and a pin. The closing devices for locks with tubular keys are in the
form of a sleeve or tube which is placed on the pin of the lock and provided with
key bit, the inner core or plug of the preceding example is here omitted.
a
The plugs or cores are adapted to turn in the tubes so that the key bit may be
turned in order to engage with the inner wall of the lock after the closing device has
been introduced. The tube does not turn in the key-hole. To this end the tube is
formed with the two beforementioned transverse slots, the former for the key-bit the

page_text: latter for the pin which is fixed into the core after the latter is introduced in the tube
for the purpose of holding it in the tube. This pin may however be omitted if the
longitudinal slot for the introduction of the key bit is afterwards closed. The core and
tube are removed from the key-hole by small pincers or small keys after the core has
been turned so that its key-bit registers with the key-hole. In the closing device
which has no core the tube is provided with the key bit and is turned.
The removal of the closing device from the lock is only to be effected by the owner
and therefore an instrument different in form for each lock is used. This instrument
may be in the form of pincers which are pushed over the projection of the core and
engage with two teeth or pins in the said projection, or the instrument may be in
form of a pair of extending levers pivotted together, for which the core must. be
formed with a recess and transverse holes. Instead of these instruments a small key
may be used which engages with the core or the tube of the closing device. The key
ends in a small projection of any desired section and provided with. a small key bit;
this projection fits in an opening in the core or tube, the key bit is turned in a transverse
slot in this opening and thus the core or tube can he turned and extracted from the
key hole of the lock. The small key is also provided with a projection for turning the
core but has no key bit. Instead of the latter the bow of the key is in the form of a
spring with a hook at the end which is pressed over a projection of the tube and
engages with this projection when the closing device may be withdrawn.
When the lock is locked and the key withdrawn the closing device is introduced in
the keyhole and the key bit is turned so that it engages with the inner wall of the
lock, the small turning instrument or key is then withdrawn until it is introduced
again for the purpose of withdrawing the closing device.
Dated this 7thday of September 1888

page_text: communication from Dr. FRIEDRICH DICHE, OI Schandau-Sachsenburg, in the
Empire of Germany, Dentist.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. 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 :-
The object of the present invention is to provide locks of all kinds with a safety
closing device which will effectually prevent them from being picked or opened after.
being locked and the key withdrawn.
Most locks and especially those manufactured wholesale, with tubular keys or keys
with solid shanks can be unlocked with more or less difficulty with master keys or
picked with skeleton keys, hooks and the like, and offer therefore little security against
burglarious entrance and theft.
By this invention however each lock can be secured against being picked by the
introduction into the key-hole of a safety closing device which is adjusted by a small
key (kept by the owner) in such a manner that it cannot be removed without the
help of this small key. The form of this small key is different for every lock and is
intended to be kept secret by the owner; the form of the device also differs for locks
with tubular keys from those with keys having solid shanks.
Figs. 1 to 10 represent various devices for locks having keys with solid shanks and
Figs. 11 to 17 devices for locks with tubular keys.
The closing devices for locks with keys having solid shanks consist of a sleeve H
(fig. 3) formed with a transverse slot S, and in which turns a core or plug K fig: 1,
provided with a key bit B. The tube H does not turn in the keyhole and to this end
it is provided with a projection L which fits into the way for the key bit of the
ordinary key.
The closing devices for locks with tubular keys are in the form of a sleeve or tube H¹
fig. 12 which is placed on the pin D of the lock, and provided with a key-bit B'; the
inner core or plug of the preceding example is here omitted.
The core or sleeve H are adapted to turn when introduced into the keyhole so
that the key-bit B or B¹ may engage with the inner wall of the lock and be held in
this position by means of a spring which can be either fastened to the wall of the lock
as represented in figs. 2, 8, and 13 or can be in the form of a spiral spring arranged in
the interior of the sleeve as represented in figs. 5, 9, 14 and 16. This spring
arrangement may be modified however without deviating from the principle of the
invention.
If a spiral spring F₁ is used with locks the keys of which have solid shanks, one
end of the spring is fastened to the core and the other to the sleeve H Figs. 5 and 9,

page_text: while in locks the keys of which have tubular shanks, one end of the spring is
fastened in the sleeve H', Figs. 14 and 16, and the free end fits in a groove formed in
the end of the pin D of the lock when the closing device is introduced.
:
The removal of the closing device from the lock is only to be effected by the owner
and therefore an instrument different in form for each lock is used, a few different
arrangements being represented in the accompanying drawings. In figures 1 and 2
a peculiarly formed hole is represented, in fig. 4 the core is provided with
a projection formed with a transverse hole and the device is withdrawn by the
aid of pincers Z' in Fig. 11 the sleeve is open and formed with transverse
holes for the extending pincers Z: in Fig. 6 the core is provided with a peculiarly
formed projection and the bow R of the key is here in form of a spring with a hook
at the end which is pressed over a projection of the tube and engages with this
projection when the closing device is to be withdrawn. The arrangements in
Figs. 12, 13, 7, 8, 9 and 10 correspond with the small key Z3 and in Figs. 14, 15, 16
and 17 differently shaped projections are represented.
When the lock is locked and the key withdrawn the closing device is introduced
in the key-hole and its key bit turned so that it engages with the inner wall of
the lock, the small turning. instrument or key is then withdrawn until it is
introduced again for the purpose of withdrawing the closing device.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, 1 declare that what I claim is :-
A closing device for key-holes of locks, having a key bit. such as B or B¹
which device is fitted in the key-hole by means of a small instrument or key the
key bit engaging with the inner wall of the lock so that the closing device cannot
be removed without the aid of the said instrument or key substantially as described.
Dated this 28th day of November 1888.