Year: 1887

page_text: Date of Application, 16th Dec., 1887 .
Specification Accepted, 20th Jan., 1888
I JOSEF SCHUBERT of Flersgehofen in the Kingdom of Prussia and German Empire
Manufacturer do hereby declare the nature of this Invention and in what manuer the
same is to be performed to be particularly described and ascertained in and by the
following statement that is to say :-
This Invention relates to locks in which two keys or other equivalents are employed
one of which operates the levers whilst the other moves the bolt and latch.
The lock hereinbefore described is so arranged that the bolt cannot be drawn back
until the key has been properly inserted and manipulated so as to place the levers in
a certain position. After the levers have been placed in a position to admit of the
bolt being partially drawn back the key must be again rotated through an angle of
180 degrees whereby the levers are placed in another position which admits of the
bolt being completely drawn back. The key must also be kept in this position in
order to admit of the drawing back of the latch. To shoot or push out the bolt the
key or handle operating the bolt simply requires to be turned in the required direction
but the latch is acted on by a spring which has a constant tendency to force out the
latch when it is not pushed back by the tumbler.
And in order that the said Invention may be fully understood I shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
figures on the annexed sheets of drawings the same letters of reference indicating
corresponding parts in all the figures.
Figure 1 of the accompanying drawings represents a door lock constructed
according to this Invention with the latch drawn back and the bolt removed.
Figure 2 represents the lock with the parts in a position in which the bolt is drawn
back but the latch is locked in the outer or closed position (the key not acting on the
levers).
Figure 3 shews the lock in horizontal section along the line z figure 2.
Figure 4 illustrates in elevation and transverse section the key used to operate the
levers of the improved lock and figure 5 similarly illustrates the key or handle used
for working the bolt and latch.

page_text: Figure 6 represents the parts in the positions which they occupy when the bolt and
latch are pushed out to the fullest extent.
Figure 7 represents a transverse section taken along the line y y (figure 2).
Figure 8 shews the works of the lock in elevation the bolt being drawn back to the
extent allowed by one turn of the key as hereinafter explained.
Figures 9, 10 and 11. illustrate a modification of the levers suitable for locks which
are completely unlocked by one turn of the key.
b
In all these figures the bolt is marked A and the latch E. The bolt A is provided
with two stumps or projections a a figures 2, 6 and 8 forming the two lateral limits
or sides of a passage or opening 6 through which the ends of a series of tumblers or
levers B can pass when placed in a certain position (figure 1) by the action of an
unlocking key D the ends of the levers B striking the said projections and preventing
the withdrawal of the bolt when the levers are in the locked position indicated in
Figure 6. The bolt A is also provided with a central stump or projection c figures 2,
3, 6 and 8 which comes in contact with the ends of one or more of the levers
(figure 8) and prevents the bolt from being completely drawn back until after the key
has been turned a second time.
The levers B are so arranged that the first turn of the key D places them in a
position (figure 1) in which they can pass between the projections a on the tail of the
bolt A and thus enable the bolt to be drawn back by means of a second key C
(figures 5 and 7) to a certain point where it is stopped by the central projection c
coming in contact with one of the levers usually the lowest marked B' in the drawings.
The key D must then be turned through an angle of 180° so as to shift the levers a
second time and place them in a position in which noteles d in their extremities
coincide and are brought opposite the projection c which is then free to enter the said
notches and enables the bolt to be completely drawn back by means of the key C.
In order to enable the levers to be placed in the two positions successively by one
and the same key a key with two bitts is employed and the levers are formed with
openings in which the bitt of the key is inserted these openings being provided as
indicated at e e figure 1 with bellies or acting surfaces which are acted on by steps on
the bitts of the key corresponding with the number of levers. These steps are of
different lengths and the notches d in the levers are so combined that the act of
turning the key through an angle of 180 degrees from the position in which the levers
are caused to clear the projections a brings the levers into the position required for
receiving the projection e. The levers B are pivoted partly on a pin f and partly on
a pin g (figures 1, 2 and 3) and are provided with springs g₁ tending to throw up the
ends of the levers pivoted on the pin g and to depress the ends of the levers pivoted
on the pin and preventing all the levers from rattling in the lock. The levers are
preferably arranged to oscillate to different extents but must be capable of being
moved by means of the key bitt acting on the bellies or acting surfaces e to the
required positions to enable their ends to clear the projections a a on the bolt and to
cause their notches d to coincide and admit the projection c. The levers are provided
with inclined surfaces h which when the bolt is drawn back come behind correspond-
ingly inclined surfaces ii on the projections a.
When the key D is withdrawn or placed in such a position relatively to the levers
as not to impede their movements the bolt can be pushed out by simply turning the
key C as the inclines on the projections a are capable of sliding over the inclines h
on the levers and move the latter out of the path of the said projections the ends of
the levers slipping out through the opening at 6 (figure 2). The bolt can be shot
with great facility by these means.
l
The operation of drawing back the bolt A and latch E is performed by means of
the key as next hereinafter described. This key C fits into and works an arm or
tumbler on which there is a pin engaging with a notch or recess m (figures 2,
6 and 8) in the side of the bolt A. To enable the latch E to be drawn back by means
of the key when the bolt A is unlocked by the key D the notch m is widened at n
so that the pin 7 after pushing back the bolt is free to enter the part n.
The key C also operates an arm or tumbler o which acts on the tail p of a lever F

page_text: in such a manner that on turning the key C a small distance further in the same
direction after drawing back the bolt A the latch E is drawn back by the action of
the said lever F (figures 1, 2 and 8).
In order to render it impossible to draw back the latch E unless the levers B are
held in the unlocked position by the key D the lower lever B₁ is provided with an
arin G which when this lever is released by the key D as indicated in figure 2
presents a corner or angle q in the path of the lever F and prevents the lever from
pushing back the latch but when the key D is placed in the required position for
unlocking the lever B₁ and arm G are raised as indicated in figure 1 in such a
imanner that the part q no longer obstructs the path of the lever F and the latch E
can then be drawn back by turning the key C.
The key D shewn separately from the lock in figure 4 is made with a long slot or
opening in one side of its pipe leading to a circular transverse slot s. A corre-
sponding stud or projection t (figure 6) is formed on the pin or pipe shaft for the
purpose of affording additional security and preventing the key from being turned in
a wrong position relatively to the levers. In order to prevent the key from being
turned in the wrong direction two springs I, I (figures 1 and 7) are attached to the
case H of the levers B and the free extremities of these springs form pawls u u which
prevent the key from being turned backwards or in the wrong direction but offer no
resistance to the turning in the forward or correct direction.
In the arrangement illustrated in the drawing the latch is acted on by a spring w
(figures 1 and 3) located in a recess or hollow formed in the shank of the latch.
This spring bears against a pin a on a plate K forming one side of the box of the
lock and tends to force the latch E outwards.
In order to unlock this lock the key D is inserted in the key hole in such a manner
that the slot in the pipe slides over the projection t on the pin or pipe shaft and the
key is then turned to the right. This has the effect of first bringing the levers into
the position indicated in figure 1. whereby the stumps or projections a a are enabled to
pass without coming in contact with the levers when the bolt is drawn back by means
of the key C. The bolt is thus enabled to be drawn back only to the extent permitted
by one turn of the key D-The key D is then again rotated through an angle of
180 degrees thereby moving the levers B to the position wherein the notches
their ends coincide and present an opening for the passage of the central projection c
on the bolt-The bolt can then be completely drawn back by the key C. Then in
order to draw back the latch E the key D is allowed to remain in the position obtained
by the second turn whereby the angle 7 on the arm G depending from the tumbler B1
is held out of the path of the lever F so that the latch can also be drawn back by
means of the key at the same time compressing the spring w.
in
In locking the lock the key D is simply placed in such a position that it does not
act on the tumblers or levers B B' and then by turning the key C the bolt A is
pushed outwards and the inclined surfaces i press the levers together so as to enable
the projections a to pass after which the levers return to their original position behind
the projections a and prevent the return of the bolt.
Figures 9, 10, and 11 illustrate a modification of the levers B suitable for locks
operated by one turn of the key. Figures 9 and 10 shew the levers in the unlocked
position and figure 11 represents them in the locked position. In this case the central
opening formed in the levers for the key bitt is so formed as to allow of the key being
turned through about three quarters of a revolution only and the levers are so
arranged that the key cannot be withdrawn when the lock is unlocked as they cover
or partly cover the key hole being moved partly in one direction or upwards and
partly in the opposite direction or downwards by the action of the key as indicated in
the drawing.
Having now particularly described and ascertained the nature of this Inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
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page_text: surfaces (e e) and acted on by a double bitted key with a bolt having stumps or
projections (a a) on either side of the levers and a central projection (c) corre-
sponding with notches (d) in the levers the said bolt being also provided with inclined
surfaces (ii) corresponding with similar inclines (hh) on the said levers one of the
levers being provided with an arm (G) rendering the drawing back of the latch (E)
dependent on the position of the key (D) which provided with slots (s) and
prevented from turning in the wrong direction the said latch being operated by
means of a tumbler (k) having an arm (o) acting on the tail (p) of a lever (F) and
being provided with a recess (e) for the reception of a spring (w) bearing against a
pin (a) all arranged and operating substantially as and for the purpose hereinbefore
described with reference to figures 1 to 8 of the accompanying drawings.
Second. In locks operated by one turn of the key the modification of the levers B
herein before described and claimed wherein the said levers are provided with openings
of such a form to allow the key to be turned through about three quarters of a
revolution only and are caused to cover the key hole when the key is acting on the
levers substantially as herein before described with reference to figures 9, 10, and 11 of
the accompanying drawings.
Dated this 16th day of Danamban 1987