Improvements in Locks for Doors and the like.
Year: 1899

page_text: Date of Application, 4th Dec., 1899-Accepted, 21st Apr., 1900
COMPLETE SPECIFICATION.
Improvements in Locks for Doors and the like.
We, PETER Kossov, Government Official, WASILLY WISCHEW, Mechanical
Engineer, PETER SOFRONOW, Government Official, and FEDOR NAOUMOFF, Govern-
ment Official, all of 30, Catherine Canal, St. Petersburg, in the Empire of
Russia, 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:
Our invention has for its object improvements in safety locks of the kind
described in the specification accompanying an application for a Patent dated
6 December 1898, and numbered 25,730.
The object of the present improvements is to provide a lock, the opening of
which shall be rendered almost impossible except a special key be employed.
For this purpose we provide in the barrel or cylinder of the lock, spring pawls,
which when the barrel is rotated, otherwise than by a special key engage against
stops provided in the chamber which surrounds the barrel or cylinder, but when
a special key is applied, the spring pawls are forced into recesses wherein they
are located, so that they will not be arrested by the said stops but will permit
the entire revolution of the barrel, and consequently the opening of the lock.
In the accompanying drawings
Figure 1 is a plan of our improved lock and
Figure 2 is a sectional elevation thereof, taken on the line 1-1 of Figure 1,
part of the bolt being omitted to show the mechanism behind.
Figure is a longitudinal horizontal section on line 3-3 of Figure 2, the
whole of the lock bolt being shown in section.
Figure 4 is an end view looking in the direction of the arrow 2 Figure 2, and
Figure 5 is an elevation of the opposite side of the lock to that shown in
Figure 2.
Figure 6 is a plan, and side elevation, of the key used with our improved
lock.
Figure 7 is a section of the pinion and cylinder, and
Figure 8 a cross section and elevation respectively of the barrel or cylinder.
In Figure 3 the arrangement of the barrel or cylinder provided with the safety
pawls is shewn in its place in the lock.
a is the cylinder or barrel with projections formed thereon; C is a pinion on
d is a lever and e a
the cylinder a, and e a rack on the side of the lock bolt g.
spindle engaging a recess P in the lock bolt g; z is a coiled spring wound on the
spindle e to assist the closing of the lock. m are the springs of the levers d
is a passage or slot for the key k. the casing of the lock; na rod or pivot of
the lever do are holes for attaching the lock to the door or the like; t is a
false way for the key; A is the pinion and B a curved rod sliding therein. ca pin
fixed in the shaft of the cylinder a and D a spiral spring acting on the rod B;
Z indicates a cut out portion for the stroke of the pin c¹, Figure 7.
All these parts are the same as illustrated and described in our previous

page_text: application herein before referred to, and as explained therein, the cylinder or
barrel a must make an entire revolution in order to unlock or open the lock. In
order to prevent a possibility of such barrel being rotated by means other than
the use of a special key (as for instance by a metallic wire or thin rod) we provide
the barrel a with transverse recesses (Figure 8) in which are arranged spring
pawls a pivoted on a shaft or rod 62 and supported by spiral springs in such a
manner that one end of each of these pawls projects externally beyond the surface
of the barrel. The other end or arm of the pawl is acted upon by a small
rod a', also located in the barrel a and having its end slightly projecting from
the surface thereof. The chamber of the casing (Figure 3) in which the barrel n
is located is made eccentric to this barrel and is provided with a stop 7.
If the barrel a be rotated not by inserting the key k but some other instrument
(for instance by a thin metallic rod) in the passage and should such instrument
not be diverted in the false way t, a partial rotation of the barrel a could be
produced, but the pawl a² will arrest such rotation as soon as it is stopped at 12.
On the contrary, by inserting the key in which no hole (such as 2) is made
for the end of the pin a', this pin will be depressed (after a partial rotation of the
barrel a) by the plain portion of the key, causing the pawl a² to be turned on
its pivot be sufficiently to avoid its meeting with the stop
It is evident that by arranging a number of such pawls a² as shewn on Figure 8
this arrangement excludes all possibility of a fraudulent opening of the lock, even
if one of these pawls could be occasionally depressed.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
In a lock having rotating cylinders or barrels provided with projections on their
surface and rotated by means of a key having corresponding depressions; spring
pawls arranged in the recesses of the barrel and adapted to be acted upon by pins
in such a manner that by depressing said pins the meeting of the pawls with
suitable stops in the lock is avoided, substantially as and for the purpose described
with reference to the accompanying drawings.
Dated this 4th day of December 1899.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicants.