An Improved Fastening Device for Sky or Fan Light Windows or the like.
Year: 1891

page_text: Date of Application, 14th Dec., 1891-Accepted, 23rd Jan., 1892
COMPLETE SPECIFICATION.
An Improved Fastening Device for Sky or Fan Light Windows
or the like.
I GUSTAY Toos of Baden-Baden in the German Empire 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 :-
This invention relates to a fastening device for sky or fan light window or the
like which can be opened and closed by means of a single crank lever.
The accompanying drawings illustrate the invention
Figure 1 showing the fastening device in its closed position while
Figure 2 shows the fastening device in section the window being open.
Figure 3 is a separate view of the double lever hereinafter explained.
From the plate a which is fixed to the window sash a projection & extends in a
slanting upward direction furnished with a protuberance or notch c.
A crank lever is arranged to pivot freely in suitable bearings a' of the plate a;
its short arm d bears by means of the protuberance or notch against the plate a
owing to an overweight which the other arme of the crank lever possesses being
weighted at its end.
The arm e is furnished with an appendage e and is jointed to a double lever
(Figure 3) the arm f of which is terminated with a finger or pawl. The other arm y
of the same is slotted and in this slot enters the arm e which is jointed with this arm g.
The latter is also weighted so that the double lever moves in a perpendicular line
upon the crank lever.
The mechanism fixed to the window frame consists of the plate g¹ to which
a frame is firmly connected. The sides of the latter frame are furnished with
notches in which a small axis or pivot i is fixed and forms a fulcrum for the lever
or cam k.
The upward oscillations of this lever or cam are limited by the part of the
frame and its downward oscillations by the projection which comes to bear on
the part 1.
The cord actuating the window sash is fixed to the arm of the crank lever and
passes over the rollers m n of the cam or lever and over the roller of the window
frame.
The fastening device operates as follows:-
In its closed position the elongated cam or lever k of the window frame is placed
over the projection of the window sash and the crank lever assumes in consequence
of its weight the position shown in Figure 1 of the drawings in which the arm d
bears against the plate a and the double lever f g (Figure 3) is suspended vertically
upon the arm or part e of the crank lever de.
When the cord is pulled it causes the crank lever e to oscillate in the direction
of the arrow (Figure 1) and the appendage e' strikes against the cam k and pushes
it away from the projection 6 of the plate a so that the fan or sky light can now
drop down as far as the two side bars fixed on both sides of the window sash will
allow. When the sash has reached this position and the cord is released the
double lever oscillates and its arm which when the window was closed was before
the protuberance c of the projection comes now behind the same protuberance c of
this projection b.
When the sash is pulled up by the cord the arm e of the crank lever is first
raised and the arm of the double lever connected thereto bears against the
protuberance of the projection b whereby the crank lever is firmly fixed and the
arm drops out of the protuberance c only when the sash comes into contact with

page_text: the window frame the projection raising the cam & which falls immediately down
in order to close the fastening device.
The frame is so formed that the cam k may be elongated at will and thus a
more or less perfect closing can be obtained.
Instead of using a double lever riding on the crank lever for the purpose of
locking the latter a suitable device may be used consisting of a pin jointed to the
projection b.
This pin bears when the window is opened against the arme of the crank lever
and locks the latter until as the sash approaches the window frame the cam k is
raised and the closing is effected.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
A fastening device for sky or fan lights or the like windows characterized by a
cam k of the window frame falling or tripping over a projection of the window
sash this cam or lever being released for the purpose of opening the window by the
operation of a crank lever de arranged to oscillate upon the window sash while in
operating the same crank lever for the purpose of closing the window a pawl or
lever held in a vertical position locks the said crank lever until in consequence of
the sash nearing the window frame the projection engages the cam k and thus
effects the closing substantially in the manner and for the purposes hereinbefore
described and illustrated in the drawings hereunto annexed.
Dated this 14th day of December 1891.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.