IMPROVEMENTS IN OR CONNECTED WITH LOCKS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Gerard Wenzeslaus von Nawrocki
at the Office of the Commissioners of Patents on the 23rd July 1883.
A communication from the Werkzeug und Maschinenfabrik Oerlikon, of
Oerlikon near Zürich, Switzerland
GERARD WENZESLAUS VON NAWROCKI, Proprietor of the firm of J. Brandt &
G. W. v. Nawrocki, Patent Solicitor and Civil-Engineer of 124 Leipzigerstrasse,
Berlin, Germany, IMPROVEMENTS IN OR CONNECTED WITH LOCKS, a communi-
cation from the Werkzeug und Maschinenfabrik Oerlikon of Oerlikon near Zürich,
Switzerland,
This Invention relates chiefly to door locks and has for its principal object to
simplify their construction, increase their strength and improve their appearance.
Whereas the cases of ordinary locks are generally composed of several pieces, I
press it of one piece of metal by means of suitable forms which turn up a flange
on all sides to the required beight, and where a partition or intermediate plate is
required I provide the same on one side (that which is turned towards the bottom
of the lock casing) with two projections which are introduced into corresponding
openings of the lock casing and then rivetted. The mechanism is perfectly arranged
and constructed as follows:
The locking latch is symmetrically shaped, so that it may be used for right or
left opening door locks; It is the only part protruding from the lock-plate and
can only be moved by the handle, while with the key a locking device can be
brought into such a position that the handle cannot move the latch.
For this purpose the handle is connected with a lever acting upon the shorter
arm of a bellcrank lever. The longer arm of this lever moves another lever
baving a knob adapted to act on a pin of the latch when required. The pivot of
the last mentioned lever is fixed for this purpose on a locking plate capable of
sliding normally to the latch and by means of a key.
If the locking plate with the lever is raised to its highest position the knob of
the lever passes the pin of the latch when the handle is moved, therefore no sliding
of the latch is effected. The motion of the bellcrank lever is transmitted to the
lever by a pin fixed on the longer arm of the belle crank lever and guided in a
slot up the sliding lever.

page_text: .
In the upper position of the locking plate, the latch is further locked by a
projecting edge of the locking plate coming in contact with a bend of the latch.
If the locking plate is lowered with the key, the knob of the sliding lever is
brought in proximity to the latch pin while while the projecting edge of the
locking plate is lowered so far that a sliding of the latch meets with no
obstructions.
The position of the different parts of the lock is thereby so changed that by
pressing the handle the latch can be drawn in.
The locking plate is guided by two pins fixed in the lock-plate, the lower pin
being used as a pivot for a pair of tumblers. One or more of the latter are
extended as much as to come in contact with the end of the latch thereby acting
as latch springs.
-
The latch is guided in the latch-plate and by a pin, while a spring tends to hold
the lever as well as the handle in a position corresponding to the closed latch. The
motion of the bellcrank lever is limited by a pair of pins. At the inner side there
is a night-bolt for stopping the action of the handle when desired. It consists of
a lever which can be placed opposite an arm connected with the main handle so
as to stop the latter. A coiled spring fitted in the lever which operates the night
bolt, and gliding on the lock plate causes a friction sufficient to retain the said lever
in any position.
The top plate or cover of the lock is shifted in front betwixt two pivots or pins
fixed to the bottom of the casing, and a pair of lugs on the latch plate. At the
back it is laid on a pair of lugs on the flange of the casing and a pin attached to
the bottom of the lock case, and is secured by a screw.