Improved Mechanism for Operating the Window Sashes of Railway Carriages or other Vertically Moveable Sashes.
Year: 1899

page_text: Date of Application, 13th Nov., 1899-Accepted, 6th Jan., 1900
Improved Mechanism for Operating the Window Sashes of Railway
Carriages or other Vertically Moveable Sashes.
I, GEORGE BARNES, of "Northcote," Miller Street, North Sydney, in the Colony
of New South Wales, Inventor, do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to a former invention for which I have applied for
British Letters Patent No. 20796 of 1899.
In the specification accompanying that application I described the use of a
spirally threaded, or twisted, rod, fitted with a coiled spring of sufficient strength
to counterbalance the sash so that it would be retained in any position or height,
to which it might be moved.
My present invention has for its object to provide means for enabling the
lower parts of the window sashes of railway carriages or other vertically moveable
sashica to be moved forwards, or outwards, over the surface of the sill or weather
strip when the said sash has been raised into its closed position whilst at the
same time admitting of the said sash being raised, or lowered, and retained in
any desired position, in accordance with my former invention as described in
my aforesaid specification.
In order that my present invention may be clearly understood I will describe
it by reference to the accompanying drawings in which―
Figure 1 is a front elevation of the door of a railway carriage, the lower inside
panel being removed in order to better illustrate the application of my present
invention thereto.
Figure 2 is a vertical central section of the said door with the window in its
half raised position.
Figure 3 is a similar view thereof shewing the window in its raised, or closed
position.
The same letters of reference indicate the same parts in all the figures.
A represents the frame of the door of a railway carriage and B a window sash
therein. This sash is not connected directly to the twisted, or spirally threaded
rod, C, as in the arrangement according to my aforesaid former invention, but
simply rests upon a bearer, or support, D, which is adapted to slide up and down
in guides in the framework of the door. This bearer, or support, is fitted, (pre-
ferably at, or about, its centre), with a nut or traveller, E, capable of working up
and down upon the twisted or spirally threaded, rod C, whose lower end is fitted
with a coiled spring I, tending to turn the said rod in the direction required to
raise the sash and adjusted to the strength required for counterbalancing the
Baid sash.
The upper edge of this bearer, or support, is preferably bevelled towards the
outside as illustrated at G in Figures 2 and 3, whilst the underside of the window
sash frame is correspondingly bevelled in order that it may automatically move
forward over the window sill or weather strip H when the sash is in its raised

page_text: position as illustrated in Figure 3. This sill or weather strip is bevelled on its
upper surface as shewn to correspond with the bevel of the bearer, or support, D,
and the underside of the window sash, whilst the groove I, in which the sash
travels, is made wider above the window sill or weather strip to admit of the said
sash being thus moved forward.
An obvious modification of the arrangement above described would be to mount
the bearer, or support, D, upon a pair of twisted, or spirally threaded rods, F
arranged one at each end instead of using only one in the centre and it is equally
obvious that the invention might be applied to the window sashes of tramcars
and other road vehicles as well as to those of railway carriages and to any ver-
tically moveable sashes which require to be moved forward over a sill, or weather
strip, when they have been raised into their closed positions.
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 herein described mechanism for use with vertically moveable sashes
the said mechanism consisting essentially of a bearer, or support, upon which
the sash rests loosely in combination with a twisted, or spirally threaded, spring-
operated rod, (or two or more such rods) passing through a nut, or traveller, or
nuts or travellers) upon the said bearer, or support, the whole being constructed
and arranged substantially as, and for the purposes herein described and illus-
trated in the accompanying drawings.
.
In mechanism for raising vertically moveable sashes, a hearer or support
having its upper surfaces bevelled outwardly and adapted to be raised by a
twisted or spirally threaded spring operated rod, in combination with a sash
frame having its lower edge correspondingly bevelled in order that when the
sash is in its raised or closed position it will automatically slide forward on to
the sill or weather strip substantially as herein described and illustrated in the
accompanying drawings.
Duted thi 1941: 1..
1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.