A New or Improved Door-fastening Device.
Year: 1899

page_text: Date of Application, 26th May, 1899-Accepted, 1st July, 1899
COMPLETE SPECIFICATION.
A New or Improved Door-fastening Device.
I, EMIL WONSOWSKI, of 3, Sigismundstrasse, Berlin, Germany, Tinsmith, 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:
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This invention consists of a door-fastening device which has the advantage
over those hitherto in use, that it is so constructed and arranged that the door may
be either completely closed or partially closed as in the case of the ordinary chain-
fastening.
In the accompanying drawing Figure 1 is a front view and Figure 2 a plan
of the device with the door shut that is to say completely closed. Figure 3 is
a plan view with the door partially open, Figure 4 is a plan and Figure 5 a side
view of the part a with the door unfastened. Figure 6 is a side view of the part b.
The fastening device consists of three parts a, b, and e of which a is attached
to the door frame, or, in the case of doors consisting of two parts, on the part
which is usually bolted, b is attached to the edge of the door which is to be closed
or the part to be closed and c on the door itself, which is to be closed.
The part a of the device consists of the iron plate 1 screwed on to the door
frame and carrying the bracket pieces 2 and 21 between which at the outer end is
mounted a double armed lever 4, turning with a spring action on the bolt 3. To
the shorter and stronger arm of this lever 4 the bar or bolt 5 is movably connected.
This bolt or bar 5 is furnished with a slot or opening 6, through which the longer
arm of the lever 4 can pass. In a thicker part of the arm 5, which is formed into
a nut, there is situated the screw 7 provided with a head or handle as shewn. The
loose end of the bar or bolt 5 has a projecting edge 8.
The part 6 of the device is a small flat second iron plate which is so attached
to the door that it lies under the screw 7 at the edge of the part of the door to be
closed in order to prevent the screw 7 from bruising the wood.
The third part c of the device which is also attached to the part of the door to be
closed, consists of the iron plate 9 which carries between two projections a piece 12
roller-shaped at the bottom, its upper part being made like a frame and being
capable of being turned over to one side, into the opening of which frame the bar
or bolt 5 catches.
The separate parts of the apparatus are so mounted that one end of the bar or
bolt 5 projects beyond the frame shaped part 12. If now the door is pressed open
(as in Figure 3), the bar or bolt will give way until its end which lies in the frame
piece 12 presses against the upper edge thereof, and if the pressure be continued
the shorter arm of the spring lever 4 is pulled out whereby the whole fastening
is lengthened. The edge 8 of the bar or bolt prevents it from slipping out from
the frame piece 12. In this manner it is possible to partially open the door, and
yet to prevent a complete opening of the same by violent means.
When the door is shut the longer arm of the lever 4 goes through the slot or
opening 6 till it presses on the plate b the shorter arm turns under the plate 2 and

page_text: the apparatus is then at rest. The bolt or bar can be removed from the frame-
shaped closing piece by pulling out the spring lever 4 from the slot or opening 6
in the bar or bolt 5 and laying it back.
If now the screw is firmly screwed into the bar or bolt until its end presses
against the plate 6 fastened on the edge of the door, the fastening will be forced
at one end against the frame piece 12, whilst at the other end the lever 4 will be
in such a position that it cannot move sideways, and the lever is therefore firmly
fixed. A thoroughly secure and firm bolt-fastening for the door is thus effected.
When the door is completely open the lever 4 is laid so far back, as seen in
Figures 4 and 5, that it engages with a projection 13 behind a catch which is
pressed down by a spring and is situated in the upper bracket plate 2 and which
can be liberated by pressing on the knob 14. By this means the bolt or bar may
be prevented from projecting over the edge of the door, or the frame, into the open
door space or door way.
As will be seen the fastening device forms in combination a substitute for the
fastening chain hitherto in use and for the fixed bolt.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is;-
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A door fastening device in which a bolt or bar 5 is attached to a peculiarly
shaped lever 4 capable of being turned in bracket-like bearings 2, 21, the said bolt
or bar being so arranged that it can be drawn out and can be fastened by means
of a screw 7 a frame shaped piece 12, substantially as described with reference to
the drawings.
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