Improvements in Apparatus for Operating Window Sashes.
Year: 1899

page_text: Date of Application, 31st Jan., 1899-Accepted, 22nd Apr., 1899
COMPLETE SPECIFICATION.
Improvements in Apparatus for Operating Window Sashes.
I, JOHN DOODY, Builder, of 17, Stratford Road, Kensington, London, 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 follow-
ing statement:
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This invention relates to improvements in apparatus for operating window
sashes, the object being to dispense with sash lines, weights, and other appli-
ances at present in use, the sashes, according to this invention being operated
by what I term a twin-screw bar" which causes them to rise and fall either
simultaneously or singly.
"
In carrying my invention into practical effect, I employ a bar of iron, steel
or other suitable material which is arranged vertically in front of the window
extending from the top sash cill to underside of sash frame, and preferably in
the centre of the window. This bar is supported in suitable bearings so as to
be free to turn or revolve, and has a right hand worm or screw thread cut on the
upper part of said bar and a left hand worm or screw thread cut on the bottom
of the said bar. A suitable screw threaded nut or collar engages with each
screw threaded end of the said bar, these nuts or collars being caused to rise or
fall as the screw bar is revolved, while each screw threaded nut or collar is
furnished with a projecting arm of sufficient length, designed to be secured to a
fixed bracket on the window sash, preferably by means of a thumb-screw, in
such a manner as to cause the sashes to rise and fall as the screw threaded nuts
or collars are operated by revolving the twin-screw bar, while either or both of
the sashes may be disengaged from the said screw threaded collars or nuts by
removing the respective thumb-screws.
This new or improved apparatus is applicable to sashes of all kinds without
in any way interfering with the present construction of the sash frames it being
only necessary to detach the sash lines to render effective the working of the
apparatus.
In order that my invention may be more fully understood, I will now proceed
to describe same with reference to the accompanying drawings in which:
Fig. 1 is a front elevation of a window fitted with this apparatus.
-
Fig. 2 is a section through the lower portion of a window frame illustrating
the method of attachment to the twin-screw bar, and
Fig. 3 is a similar view through the upper portion of a sash illustrating the
arrangement of the parts.
According to this invention the bar a is arranged vertically in front of the
window as shown where it is supported in suitable fixed bearings g in such a
mannér as to be free to turn or revolve.
The upper portion a¹ is furnished with a right hand screw thread, while the
power portion a² is furnished with a left hand worm or screw thread. The
screw threaded extremities a¹ and a of the bar a each carries a screw threaded
nut or collar furnished with a projecting arm 61 of sufficient length designed

page_text: to be secured respectively to a fixed bracket e fitted to the upper and lower
sashes f, preferably by means of a thumb-screw d as shown. The twin-screw
bar a is operated or revolved by means of a suitable sliding cross bar such as r
passing through the boss k, and when turned from left to right will cause the
lower and upper sashes to rise and fall simultaneously, while upon reversing
the direction of movement of the said twin-screw bar a it will cause the sashes
to simultaneously close. Either one or both of the sashes may be disconnected
from the arm and its corresponding screw threaded collar or nut by removing
the thumb-screw d, so that one sash only may be raised or lowered by operating
the twin-screw bar. The upper projecting arm of each of the fixed brackets e,
works upon a hinge as shewn so as to allow of its being turned up out of
the way when disconnected from the twin screw bar, to allow of the bottom sash
passing the upper sash.
The screw thread or worm may be of any required "pitch," but is preferably
formed so as to enable the sashes to be opened a maximum distance with a
minimum number of revolutions of the twin-screw bar consistent with the reliable
and efficient working of the apparatus.
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. The new or improved apparatus for operating window sashes consisting
of a bar such as a arranged vertically in front of a window in fixed bearing such
as g so as to be free to revolve, and having right and left handed screw threads
cut upon its upper and lower parts a¹, a²: in combination with screw threaded
collars or nuts such as having projecting arms such as b₁ plesigned to be
secured preferably by means of thumb-screws such as d to fixed brackets such
as a secured to the window sashes f, and an operating bar such as ; the whole
combined, arranged and operating substantially as herein described and shown
with reference to the accompanying drawings, and for the purposes specified.
2/. In apparatus for raising and lowering window sashes, the employment of
a twin-screw bar such as a substantially in the. manner set forth and herein
described with reference to the accompanying drawings.
Dated this 7th day of March 1899.
F. G. CASSELL,
(Of Cassell & Co.),
22, Glasshouse Street, Regent Street, London, W.,
Agent for the Applicant.