Year: 1899

page_text: Date of Application, 10th Nov., 1899-Accepted, 6th Jan., 1900
I, LOUIS WILHELM BERNHARD STÖCKER, of Marienstrasse, Schonberg, Magde-
burg, Saxony, Major in Service, 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 new invention relates to a device for opening doors from a distance which
can be employed for all possible kinds of doors and which serves to enable the
occupants of closed or locked houses and rooms to enjoy a secure and quiet
slumber whilst affording them all possible convenience for opening the door
because the lock of the door can be at once opened by the more pulling of a
cord from any point of the house, for example by a person in bed whilst it is
impossible to open the lock from the outside. This door-opening device is
extremely suitable more especially for sleeping rooms because the occupant of
the locked room can remain quietly in bed whilst the servants are removing or
bringing the boots and shoes and garments to be cleaned from and into the
room so that the sleeper is enabled to lie in bed till the last minute. This
device for opening doors at a distance is also very suitable for opening the doors
of hotels because a person requiring admittance at night time is at once notified
by the bell of the opening device that he has been heard aud that he will find
the door open, so that he can at once enter into a doorway or hall etc. sheltered
from wind and rain until the porter comes and opens the inner door. This new
invention is also very suitable for doctors and chemists because in these cases
also especially in bad weather, the otherwise unavoidable waiting at the door
of the house (which is such a drawback) is obviated.
This invention is illustrated in the accompanying drawings in which:
Figure 1 shews the arrangement of the door-opening device applied to a closed
door. Figure 2 is a section on the liner of Figure 1. Figure 3 shows some
details of the invention. Figure 4 shows the open lock with the opening device,
and Figure 5 illustrates an apparatus for placing the opening-device out of
operation.
The lock a appertaining to the device for opening at a distance must be so
constructed that the bolt & when in the closed position, shall be capable of beine
pushed in again from the front in order by this means to open the lock. The
bolt is constructed so as to have in its forward lower part, a notch e, into which
there engages in closing the lock a tongue d which can pivot on a pin i. A
small plate (not shown in the drawing) is provided below the bolt b
it ensures the horizontal movement of the bolt and prevents the
latter from becoming depressed and fixed during the rearward movement.
The tongue d forms one arin of a bent lever, whilst the other arm c, when the
opening device is not employed, bears against a wall and is held by means
of a counter-weight 9 which is situated inside the closed room and which has
also for object to cause the tongue d to enter firmly into the notch c of the bolt b
in locking the door. The counter-weight g hangs juside the room on a lever f,

page_text: to the free end of which there is attached a chain h which serves as the means
for opening the lock a. The chain his led to the point from which the open-
ing of the lock is to be effected. In opening the lock the following operation
takes place:-
On pulling the cord or chain h, the weight 9 with the lever frises, and also
rotates the bent lever of the bolt on its pivot . In the rotation of the bent
lever, the tongue d becomes disengaged from the bolt b, and the aim e presses
the bolt 6 into the lock, whereby the door is opened (see Figure 4). At the
same time in its ascent, the lever strikes against a suspended hello whereby
the person waiting outside is notified that the door is open. An arrangement
is also provided which enables the door-opening device to be placed out of opern-
tion (see Figure 5). A lever in rotating upwards, bears behind the nose f
of the lever whereby the tongue is kept away from the bolt b. Consequently
when the opening-device has been placed out of operation, the lock of the door
will operate in the same manner as an ordinary lock, and this is of advantage
especially in cases where the occupant is compelled to leave the house so that
in this case he can enter and go out without inconvenience. The door-opening
device herein described which does not allow of the door being opened from the
outside is especially applicable in those cases where an increased security is
desired, or in those cases where the door and the door post do not fit together
with sufficient accuracy so that without the use of the tongue d, the space left
between the two could be readily utilised for pushing back the bolt. In those
cases where the door closes with an exact fit against the door post, the tongue d
can be dispensed with, so that only the arm operates to open the lock o. It
may also be mentioned here that instead of a chain, the electric current may
also be used for placing the opening device in and out of operation, so that the
door can be opened and closed by simply pressing upon a knob.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what
I claim is:-
-
(1) A device for opening doors at a distance, characterised by a lock a which
is provided with a bolt 6 that can he pushed back from the front and that has
a notch into which there enters, when the door is closed, a claw & that forms,
with an arme a bent lever and which latter being pivotted on a pin i under the
influence of a weight g keeps the door closed whilst when the weight g is lifted.
after the claw has been disengaged, it pushes by means of one arm the bolt b
into the lock.
(2) A device for opening doors, constructed, arranged, and adapted to operate
substantially as hereinbefore described and shown.
Dated this 10th day of November 1899.
ROBERT E. PHILLIPS, Assoc.M.Inst.C.E., M.I.Mech. E.,
Chartered Patent
Loent