Improvements in Flush-bolts for Doors and other purposes..
Year: 1893

page_text: Date of Application, 16th Nov., 1893-Accepted, 17th Feb., 1894
COMPLETE SPECIFICATION.
Improvements in Flush-bolts for Doors and other purposes..
I, LEO MEYHOEFER, of 68 Rosenthalerstrasse, Berlin, in the Empire of
Germany, Merchant, 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 :-
In the improved flush-bolt, illustrated in the annexed drawing, the bolt proper is
actuated by a lever with a powerful action so that the bolt is especially useful for
heavy doors, but it may however be employed for any kind of door, window or the
like, such as a wardrobe or cupboard door, when constructed on an appropriately
smaller scale. The lever aforesaid is arranged in such a way that it lies, when in
its extreme positions, in corresponding slots in the face plate or framing of the bolt
and so that it can be fixed (held fast) by means of a key and pawl.
In the annexed drawing
Figs. 1 and 3 show a plan view as seen from behind, of the flush-bolt, having
its bolt drawn back in Fig. 1 and pushed forward in Fig. 3.
Figs. 2 and 4 represent analogous views seen from the side.
The flush-bolt may be fixed in the usual way near the edge of the door or the
like and is constructed as hereinafter described. On the back of the face plate or
frame a the bolt bruns in guides c c¹ and the pin d connects it at its inner end to the
intermediate draw-piece e. The intermediate piece e' is engaged at its other end by
means of the pin h to the lever f, which latter is arranged so as to turn on its
fulcrum pin g carried in lugs on the back of the face-plate or frame. The latter
provided with a slot i, in which the lever moves and in which it recesses when
in either of its extreme positions, the edge of the lever being preferably flush with
the outer face of the face-plate. The lever possesses a notch k into which the
pawl engages. This pawl is pivoted on the face-plate and is moved by a key
from outside the plate at m. The intermediate piece e is shaped to form a cap n
arranged to lie behind the circular notch p which terminates the slot i in the face-
plate, so as to prevent dust and the like from entering to the inside of the
flush-bolt. A similar but fixed cap n' covers the inside of the circular notch p
which forms the other end of the slot i in the face-plate.
The pawl serves to arrest the flush-bolt when in closing position, and can only
be released by the aid of the corresponding key.
The function of this flush-bolt is as follows:
To open the bolt, the pawl is unlocked and the end of the lever f is drawn out
by the finger from its housing notch p' (Fig. 3) and the lever is turned around its
pivot g in an upward direction, the intermediate piece e and the bolt b are thus
drawn downward and arrive into the position shown in Figs. 1 and 2, while the end
of the lever enters the notch p. On the other hand to close the flush-bolt the
movement is reversed, namely the lever is drawn out of the notch P and turned
downwards, thus shooting the bolt upward, whereupon by means of the key at m,
the pawl is turned into the slot k, so that the flush-bolt is secured against being
opened by persons unprovided with a key to fit the axle pin of the pawl l.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improvement in flush-bolts, consisting in the combination with the bolt b
of the draw bar e, and lever f, turnable upon its fulcrum g, so that by turning said
lever around an angle of 180°, the bolt is pushed forward or drawn back respectively,

page_text: the lever, when in its extreme positions, placing itself into a notchi in the face-plate
or framing.
2. In the aforesaid flush-bolt, the arrangement of caps n and n¹ to prevent
dust etc., from entering the inside of the flush-bolt.
3. In the aforesaid flush-bolt, the arrangement of the pawl / to be turned by
means of a key so as to engage into a slit k in the bolt f and lock the same,
thus securing the flush-bolt substantially as described.
. Dated this 16th day of November 1893.
R. HADDAN,
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, Agent for Applicant.