Improvements in or connected with Locks Operated by Keys.
Year: 1899

page_text: Date of Application, 3rd Aug., 1899 -Accepted, 23rd Sept., 1899
COMPLETE SPECIFICATION.
Improvements in or connected with Locks Operated by Keys.
I, JOHANNES GEHLE, of 62, Auerstrasse, Elberfeld, in the Empire of Germany,
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:-
This invention for improvements in or connected with locks has for its object
to provide means for releasing a lock bolt which has only been partly shot, from
its tumbler, on the application of the key and to thus enable the lock-bolt to
be pushed back again into the lock-box by means of the key, and consists in
pivotting or otherwise connecting with the bolt so as to turn or slide therein a
plate adapted to afford an engaging point for the key in the half-locked position
of the bolt.
The accompanying drawing illustrates the invention which is applicable to
all constructions of locks.
Figs. 1 and 2 are similar elevations of the interior of a lock showing the bolt
in a partly shot position, and also different positions of the releasing plate.
Fig. 3 is a perspective view of the plate.
Figs. 4 and 5 are similar views to Figs. 1 and 2 showing a modified application
of the releasing plate.
Fig. 6 shows the construction of the bolt for the reception of the modified form
of plate.
Fig. 7 is a detached view of the plate.
The construction of the lock according to Figs. 1 to 3 is as follows:-
On the bolt a, which is furnished with a wide recess a pin c is arranged on
which the plate d is suspended so as to turn, its lowest position being determined
by the stop e also fixed on the bolt.
The plate d has a projection or shoulder f, which when the plate is raised acts
against the tumbler lever g of the tumbler h mounted above the plate d.
The construction of the lock according to Figs. 4 to 7 is as follows..
The plate i is arranged to slide vertically in the bolt a between guides and
guide pin or stop arranged on the bolt, the pin engaging in the slot m formed
in the plate i and limiting the movement of the plate.
The upper edge of the plate i acts against the widened projection p of the
tumbler lever g of the tumbler h.
The recess n in the plate i is smaller than the recess o in the block a.
The action of the above described plates d and is as follows:-
If by means of a wrong key B, the key-bit of which is shorter than that of the
proper key A, the bolt a is only half pushed out of the lock-box, as shown in
Figs. 12, 4 and 5, and the proper key A is inserted in the lock, it will, if turned
at the right time strike against the plate shown in Fig. 1 and 2 or against the
plate shown in Figs. 4 and 5. In both constructions, the plates d and i are
moved upwards by the pressure of the key A, the plate d acts with its projection f

page_text: against the tumbler-lever g and the plate i acts in a similar manner with its
upper edge against the widened projection p of the tumbler lever g.
In both constructions the tumbler spring is moved upwards and its action on
the tumbler h terminated.
In consequence of this, the proper key A can enter the recess born and by
pressing against the projection u press the bolt back into the lock.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. The improved releasing apparatus for locks consisting of a plate a pivoted
on the bolt and upon the partial shooting of the same serving as an engaging
point for the key whereby it is possible when the bolt a is in the half-locked
position to act thereon with the proper key A and by raising the tumbler from
the bolt, to allow of the same being shot back substantially as described.
2. The improved releasing apparatus for locks consisting of a plate i adapted
to slide on the block in a vertical direction whereby it is possible when the bolt a
is in the half-locked position to act thereon, the plate i being raised by the
key A raising the tumbler which frees the bolt so that the key bit entering the
recesso of the bolt a and pressing against the projection u effects the return of
the bolt a.
Dated this 3rd day of August 1899.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.