Improvements in Weather Bars for Casement Sills.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Weather Bars for Casement Sills.
JOHN SANDERS STEVENS, Engineer, trading as Archibald Smith & Stevens of Janus
Works Queen's Road Battersea, and THOMAS GEORGE BIRCH, Brass-finisher of 6 Golden
Street, Shaftesbury Estate, Battersea, in the County of 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 following statement :—
Our invention is for an improvement in weather excluding metal bars, fitted to the
sills of casements, or doors, opening inwards, and relates more particularly to that
form of bar described in Royal Letters Patent No. 5770 A.D. 1829 granted to Andrew
Smith and W. H. Kitchen. That bar consists primarily of three narrow strips of
metal each equal in length to the width of the casement.
"
The first strip lies along and is firmly secured to the sill, longitudinally it is level
and straight, but transversely it has a slight downward slope toward the outside, and
its inner edge is usually curved upwards. The second strip termed the "rising flapi
is hinged throughout its length to the outer edge of the first, and when the casement
is open, lies down flat upon the first strip. The outer edge of the second strip is
curved downwards. The third strip termed the "face plate," is quite flat, and is
secured to the outside face of the bottom rail of sill, about half of its width projecting
down below the bottom of the rail.
The casement carries a small metal hook, or toe piece, fixed near the closing style,
for the purpose of picking up the hinged strip or "rising flap." Thus when the case-
ment is being closed and is within about two inches of the closed position, the toe piece
engages with the rising flap, lifts it into a vertical position, and as the face plate has
already passed beyond the rising flap,-the latter rises behind, and is forced by the
toe piece into close contact with, the face plate, overlapping it by about one third of
its width. The bottom rail of casement is cut away to allow of the requisite move
ment of the rising flap. The curved edge of the rising flap has now passed beneath
the outer edge of the fixed strip. Under these conditions, any water driven against
the outside of casement, flows down the face plate, thence down the rising flap on to
the sill, and so away. The opening between casement and sill is effectually shielded
by the face plate and rising flap, both as regards wind and rain. When the casement
is opened, the toe piece retiring allows the face plate to push the rising flap down
into the horizontal position and pass freely over it.
Our invention has for its objects (1) Greater simplicity of form, avoiding curved
sections, and thereby making possible the use of cheaper materials which could not
well be worked in curves; (2) Less cutting away of bottom rail for movement of
rising flap; and (3) A more weather proof joint between the rising flap and the
fixed strip.
For these purposes we construct the bar of three perfectly flat strips; the first is
fixed in a vertical position to the sill; the lower edge of the second or rising flap is
hinged to the upper edge of the first, in such a manner that the rising flap is outside
the fixed strip, and overlaps it about one third of its width, and is also at liberty to
fall inwards into a horizontal position; the third strip or face plate is fixed to the
bottom rail as before, so that it in turn stands outside the rising flap, and overlaps it
as much as the rising flap overlaps the fixed strip. When the casement is closed the
three strips have to each other the same relative positions as three laths in an iron
revolving shutter. The rising flap is picked up by a toe piece as before.

page_text: Fig. 2 is a similar section shewing the casement nearly closed, and the toe piece
just about to lift the rising-flap.
Fig. 3 shews the outside appearance of casement and weather bar when
closed.
The same letters of reference apply to similar paris in each figure. A is the
sill; B the bottom rail of casement; the fixed strip; D the hinged or rising-
flap; E the face plate; and F the toepiece.
Having now particularly described and ascertained the nature of our said Invention,
and in what manner' the same is to be performed, we declare that what we
claim is
A sill-bar consisting of three flat strips and a toepiece, constructed or applied in
the manner and for the purpose described and illustrated.
Dated this 18th dox of Feb 1800
JOHN SANDERS STEVENS.
THOMAS GEORGE BIRCH.
JOHN SANDERS STEVENS.
THOMAS GEORGE BIRCH.