Improvements in and connected with Locks.
Year: 1896

page_text: Date of Application, 7th Jan., 1896--Accepted, 14th Mar., 1896
COMPLETE SPECIFICATION.
Improvements in and connected with Locks.
We, RUDOLF MÜLLER and ADOLF MÜLLER, both of Langenfeld, in the
Province of the Rhine, German Empire, Manufacturers do hereby declare the
nature of our 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 refers to locks of the kind known as Chubb-locks and our improve-
ments in locks of said kind relate to a special configuration and arrangement of the
tumbler-plates as well as to a special arrangement and configuration of the tumbler
bolt, and, third, to some other arrangements and configurations of parts hereinafter
more fully described.
Referring to the accompanying drawings similar letters denote similar parts
throughout the different views.
mm denote the tumbler plates which represent angular double-armed levers,
and are fulcrumed upon the pin k. The arms m of said levers, or tumbler-plates
respectively, are the tumblers proper, whereas the arms m¹ serve for the reception
of the tumbler bolt h (Figs. 1 & 6) or more precisely for the two flat parallel
projections of said tumbler-bolt. To let said projections pass, the arms m' of
the tumbler-plates are provided with longitudinal slots m 2, Fig. 2, against the
edges of the long sides of which lay the outer edges of the said projections /', as
distinctly to be seen in Fig. 2.
If the tumbler-bolt, or its projections respectively, are in the position shown
in this figure, the tumbler plates cannot move to any side, as will be clear without
further explanation.
The key d, Fig. 7, or its bit d' respectively, takes not only through the main
portion of the tumbler bolt, but between the projections too. Said bit
possesses a special configuration (compare Fig. 7) and can be put into the lock, or
into the tumbler bolt respectively, only in a vertical position. To enable this the
projections of the tumbler bolt must lie in one horizontal plane (compare
Figs. 2 & 6) which is the normal position of said parts when the lock bolt is either
fully locked or fully unlocked.
In the form of construction shown the lock is furnished with three tumbler plates
(see Fig. 5). To operate these plates the bit d' of the key is provided with three
pairs of steps situated one diametrically opposite to the other as shown in Fig. 7.
The distance between the two steps belonging to one pair is exactly the same as in
any of the two other pairs of steps, and corresponds moreover exactly with the
breadth of the slots m 2 in the arms m' of the tumbler-plates. If the various parts
of the lock are in the position shown in Fig. 2 the tumbler-plates are all in line, and
the pin g that is fixed to the lock-bolt a is, therefore, prevented from moving out
of the short curved slots provided in the arms m of the tumbler-plates for the
reception of said pin. If, however, the key, or its bit respectively, is turned an
angle of 90° (compare Figs. 3 & 7) the tumbler-plates will owing to the two sets
of steps of the bit be so adjusted as to bring all the connecting slots (between
every two of the curved slots of the arms m of the tumbler-plates) in line (Fig. 3)
and thus to allow the pin g of passing from the inner set of curved slots to the
outer set of the same.
The lock bolt a is operated by the radial projections ii, Fig. 1, that form part
of the tumbler-bolt . In consequence of the lock shown being a twice-turcing
lock there are two of said projections i, and there are two sets of curved slots in
the tumbler-arms m, as already mentioned. The tumbler-bolt is turned by the key,

page_text: and the lock bolt a is acted on by one or the other of the said radial projections i¹
only after the tumbler-plates have been properly adjusted by the steps of the bit d'
of the key, as afore described.
We prefer to combine our improved arrangement with means for operating the
ordinary upper bolt of the lock automatically when opening the lower lock proper,
so as to do away with the necessity of putting the key into two key-holes or using
two keys respectively.
In the form of construction shown the ordinary upper bolt f is coupled with a
one-armed lever e. Said lever e is operated by the mediation of the arm c of a
double-armed lever c c that is fulcrumed at b to the lock bolt a, and is, therefore,
displaced together with said lock-bolt. When the latter has fully been withdrawn
(as in Figs. 1, 2 & 6), and the key is turned for the third time, the arm c¹ of the
lever c c is then operated by a projection 2, Fig. 6, of the tumbler bolt h, and
the lever arms e and e are thus moved to the left so as to withdraw the bolt f.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a lock of the Chubb-type, the combination with tumbler-plates representing
angular double-armed levers, one arm of each of which forms a tumbler proper, of
a tumbler-bolt taking through longitudinal slots of the other arms of said levers,
and having two parallel flat projections permitting of the key taking between them,
and touching with their outer edges the inner edges of said slots, substantially and
for the purpose as described.
2. In a lock of the kind claimed, a tumbler bolt having a radially extending
projection or projections adapted to operate the lock bolt, substantially and for the
purpose as described.
3. In a lock of the kind claimed, a lock-bolt having a double armed lever, and a
tumbler bolt having a projection adapted to act upon one arm of said lever
after said lock bolt has been fully withdrawn; said lever having its other arm
laying against, or directly or indirectly coupled with, the ordinary upper bolt of
the lock, substantially and for the purpose as described.
4. In a lock of the Chubb-type, the various arrangements, combinations, and
configurations of parts, as shown and described.
Dated this 7th day of January 1896.
KUDOLF MULLER,
ADOLF MÜLLER,
By De Katow & Co.,
Agents for the Applicants.