An Improvement relating to Locks.
Year: 1895

page_text: Date of Application, 26th June, 1895-Accepted, 17th Aug., 1895
Date of Application, 26th June, 1895-Accepted, 17th Aug., 1895
An Improvement relating to Locks.
I, FRIEDRICH CLEVER, of 169 Selbeckstrasse, Hagen, in the German Empire,
Manufacturer, 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 :-
The subject of this invention is an improvement in locks, applicable both to case
or rim locks and to mortise locks, and the effect of which is considerably to simplify
and reduce the cost of the construction of these several types of locks. The main
feature of the improvement is, that the tumbler spring, instead of being, as hitherto,
fastened in place by a rivet or rivets, spikes, pins or the like, is, in the shape of a
flat spring bent in S shape inserted into the lock loosely.
The subject of the invention is illustrated in the accompanying drawing in
connection with a "single turn" lock;
Figure 1 of the drawings being a view of the interior of the lock; and in order
to facilitate the inspection of its inner arrangement, the curved or U shaped plate,
forming a case over the tumbler, is supposed to have been removed, its position
being indicated in dotted lines.
Figures 2 and 3 are respectively, a top view or plan, and an end view of the said
curved plate.
Figure 4 is an elevation of the S shaped tumbler spring; and
Figure 5 a similar view of a tumbler plate.
Except as regards the tumbler, the case-lock or mortise lock (as the case may be)
is constructed exactly in the same manner as either of these types of locks
generally are.
It contains a bolt a the "dragging" bar of which is cut away at c, and in the
toothed portion c' of which there engages the tumbler toe b¹ projecting from the
tumbler plate b.
Above the tumbler, the bent or S shaped tumbler-spring d is loosely inserted
into the lock. Such spring preferably consists of a narrow steel strip, bent in S shape.
Over the complete arrangement, the U shaped bent cover plate, shown in Figures 2
and 3 is so placed, that it assumes the position indicated in dotted lines. In this
position it is secured by projections el engaging in corresponding apertures e".
The cover plate e serves to guide the bolt a which is adapted to slide in a
corresponding recess in the left side-flange of the said plate. The tumbler plate b,
which, being loose in the case formed by the cover-plate, is capable of being
shifted therein, the extent of its displacement being limited by the size of the recess o
in the vertical direction. The tumbler spring d is retained in position merely by
the cover-plate e being adapted to press upon the bolt and tumbler plate in the
downward direction, thereby retaining the tambler toe in engagement with the
toothed portion c¹ of the bolt-bar.
The operation of the improved lock is as follows;-
For locking, the key is inserted through the guiding tube or sleeve e provided on
the cover plate, into the key-hole. As the key is turned, its bit first meets the
tumbler plate b, which it raises, the tumbler-spring being, in consequence, compressed
in the vertical direction. This causes the bolt to be released, the toe ' becoming
disengaged from the toothed portion c'; and the bolt may then, as the key is further
turned, be moved backwards and forwards.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same to be performed; declare that what I
claim is ;-
Case-locks and mortise locks provided with a loosely inserted S shaped tumbler-