An Automatic Flush Bolt for Folding-doors or Windows and. the like.
Year: 1888

page_text: An Automatic Flush Bolt for Folding-doors or Windows and.
the like.
I, CHARLES HUELSER of the firm of Huelser & Co. Patent Agents, of 39 Brompton
Crescent, London S.W., in the County of Middlesex, do hereby declare the nature
of this invention, a communication to me from abroad by the firm of "Regulator-
uhrenfabrik Concordia" of Freiburg, Silesia, in the Empire of Germany, Manufacturers,
to be as follows:-
This invention relates to a device by means of which one wing of a folding-door
or window or the like is automatically bolted or unbolted on closing or opening the
other wing.
The improved device essentially consists of an angle piece of sheet metal or other
suitable material having an inclined slot and an angularly deflected loop or ear
forming a continuation thereof. On the inner side of the angle piece is provided a
bolt movable about its axis and up and down through the head plate of the angle
piece and through a suitable guiding furnished on the opposite side. Said bolt has
a pin or lever projecting through and guided in the inclined slot and its extension.
This pin is held in a vertical position to the angle plate by the action of a spiral
spring surrounding part of the bolt.
Two of the improved devices which are symmetrically constructed, are so screwed
or otherwise secured to one wing of the folding-door or the like, that when said
wing is closed, the other wing, on being shut onto the same, impinges on the above-
mentioned pins and forces them through their guidings. Thereby the bolts are moved
for about 90° round their axes and simultaneously up and down respectively into the
keepers provided in the frame work. On opening again the lastmentioned wing, the
spiral springs return the bolts and pins into their normal position, and the other wing
can be opened.

page_text: 1, CHARLES HUELSER of the firm of Huelser & Co. of 142 Fleet Street, London,
Patent Agents do hereby declare the nature of this invention, a communication to me
from abroad by the firm of "Regulatoruhrenfabrik Concordia" of Freiburg Province
of Silesia, Empire of Germany, Manufacturers, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
The object of this invention is a flush bolt for folding-doors or windows and the
like serving to automatically bolt or unbolt one wing on closing or opening the other
wing.
Referring to the accompanying drawing
Fig. 1 is a top view of the improved device.
Fig. 2 a side view, the bolt being drawn back.
Fig. 3 a side view. with closed bolt.
Fig. 4 a bottom view, and
Fig. 5 the other side view.
The improved flush bolt is 'constructed in two symmetric arrangements so as to
allow one bolt to be screwed or otherwise secured to the top, the other to the bottom
of one (left) wing of the door or window in such a manner as to cause the levers
provided at the bolts proper to be turned inward on shutting the other (right) wing
onto the same and the bolts to be locked.
S
The improved device consists of the angle piece w of sheet metal or other suitable
material having an inclined slot e and an angularly deflected loop or ear el forming
the extension thereof, the bolt with lever h, the guiding a and the spiral spring
surrounding said bolt. This spring tends to retain the bolt r in its inoperative
position and thereby the pin or lever in a vertical position to the angle plate w
(Figs. 1. 2 and 5).
g
When the wing provided with the improved flush bolts is shut, the other wing, on
being shut onto the same, to close the door or window, impinges on the levers and
turns the same inward, thereby simultaneously revolving the bolts for about 90°
about their axes and causing them to protrude to a certain extent, owing to the
inclined slot e. Thereby the bolts enter their keepers provided above and below in
the frame work and lock the door or window (Fig. 3). On re-opening the last-

page_text: 2'
mentioned wing, the springs returns the bolt and therewith the lever h into their
original inoperative position, thus allowing also the other wing to be opened.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
An automatic flush bolt consisting of an angle piece w having an inclined slot e, a
bolt provided with lever h, a spiral springs, and a guiding a, substantially as and
for the purpose set forth.