Improvements in Locks.
Year: 1899

page_text: Date of Application, 13th Dec., 1899-Accepted, 17th Mar., 1900
COMPLETE SPECIFICATION.
Improvements in Locks.
GEORGES POPESCO, of Bucharest, in the Kingdom of Roumania, Electrician, 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:
This invention has for its object a safety lock mainly intended for plate (silver)
chests or safes, which is provided with a device for preventing the main bolt from
being withdrawn when in a locked position, and consequently preventing the door
being opened even if the lock be violently torn from the door. One form of con-
struction of this lock is shown in the accompanying drawings as an example, in
which:
Fig. 1 is an external side view of the lock with the bolt in a closed position;
Fig. 2 is a view of the lock in the same position as shown in Fig. 1 but after
the removal of the cover plate forming the front or external part of the lock:
Fig. 3 is a vertical section of the guide plate of the bolt, on the line A B and
seen in the direction of the arrows 3, Fig. 2;
Fig. 4 is a transverse vertical section of the lock on the lines EF Figs. 1 and 5
seen in the direction of the arrows 4;
Fig. 5 is a horizontal section of the lock on the line CD, Fig. 2;
Fig. 6 is a horizontal section showing the key or cam which serves to move
the main bolt but which is still located in the lock.
A is the bolt proper, the front end of which may move in the bolt guide ab
which in the present instance is in two parts. The rear end of the bolt is guided
in the usual manner on a slide d on the rear cover c of the lock Figs. 2 and 5,
by means of a slot. The bolt which in the drawings is shown in the closed posi-
tion is operated by a tooth or cam f Figs. 2 and 6 which engages in a notch or
groove in the bolt, shown in dotted lines in Fig. 2. To move the cam fa
socket key Figs. 1, 4 and 6 is employed which when inserted in the lock in the
direction shown by the arrow i of Fig. 6 may move the cam f in two directions
of rotation by means of its square socket and the squared end with which the
cam is provided. Fig. 6 enables it to be seen how the tooth or cam f is located
in the front plate m and rear plate c of the box of the lock.
When the bolt A is in the closed position shown in the drawings it is prevented
by a projection n (which is shown in dotted lines in Fig. 2 and in section in
Fig. 5) from being moved back by the cam f owing to its rear vertical edge o
Figs. 2 and 5 encountering this projection n. This latter is fixed on a slide p,
Figs. 2, 4 and 5, which is held by tumblers 9 (Figs. 2 and 4) in the bolted
position shown in these same figs.
If by means of the flat key Figs. 4 and 5 these tumblers 9 are moved in the
direction indicated by the arrows round their common pivot t they enable the
rear projection of the slide p to enter the tumbler notch and if the cam f be
then turned in the direction of the arrow w, Fig. 2, by means of the socket key h,
it first moves the slide p in the direction of the arrow u Fig. 2, sufficiently far
down to allow the upper edge of the catch n to lie under the lower edge y of the

page_text: bolt A so that the latter is no longer prevented being withdrawn. In its subse-
quent rotation the cam f engages in the recess or groove (Fig. 2) already men-
tioned of the bolt and it moves this latter in the direction of the arrow, that
is to say returns it to the open or unlocked position.
All that is hereinbefore described as regards this lock is no longer new but this
description was necessary in order that the principal object of the invention which
will now be described may be exactly explained in its construction and mode of
working. It has already been mentioned at the commencement of this specifi-
cation that the front guide plate for the bolt A is composed of two parts a and b
(Figs. 2 and 5). These two parts leave a space a between them Figs. 2 and 3
in which a locking slide b¹ may travel vertically up and down. A spring cl
Fig. 3 usually presses the slide upwards so that the lower edge d' of its open-
inge which allows of the passage of the bolt A, engages in a transverse groove f¹
Fig. 2 in the bolt A when this latter is in a locked position.
In the slide b¹ there is a second notch or recess g¹ Figs. 2 and 3 placed above,
in which engages the free end h¹ of a horizontal arm fixed rigidly on the
slide p. Immediately the tumblers q have been brought into the position shown
in Fig. 4, by means of the flat key r Figs. 4 and 5 and the locking slide p
Fig. 2 is pushed downwards in the direction of the arrow u, said slide p by
means of its fixed arm brings the slide sufficiently towards the bottom to
allow of the edge of the slide releasing itself from the groove f¹ Fig. 2 of the
bolt A and consequently the bolt is set free for the recoil. Later when the bolt
is shot, the bolt A first advances sufficiently to allow the projection Fig. 2 to
pass again behind it, the slide p moves upwards and its arm allows the locking
slide 6 to re-enter the groove f¹ of the bolt.
It is evident from the foregoing that even if all the principal parts of the lock
be broken and the arm i torn out, the slide 61 nevertheless remains held in
its upper position, that is to say its locking position, by the spring c¹ Fig. 3 and
does not allow the front acting part of the bolt A to slip back and release the door.
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
An arrangement in locks adapted to prevent the withdrawal of the operative part
of the bolt in its locked position even if the box of the lock has been forcibly
broken, characterized by a slide (61) being arranged in the front piece (ab) of the
box of the lock which serves for guiding the bolt, said slide being adapted to
engage automatically in a groove (f) in the bolt when the latter assumes its
locked position, whilst when the lock is opened normally, said slide is pushed
down out of said groove by an arm (¹) guided within the box of the lock and
moved by a cam (f), in such a way that the bolt is released substantially as here-
in before described, with reference to the accompanying drawings.
Dated this 12th day of December 1899.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.