A Horizontal Condensation Bar in Combination with an Improved Metallic Sash-bar for Glass Roofs and similar Structures.
Year: 1888

page_text: Date of Application, 19th July, 1888
Complete Specification Left, 20th Apr., 1889-Accepted, 15th June, 1889
PROVISIONAL SPECIFICATION.
A Horizontal Condensation Bar in Combination with an Improved
Metallic Sash-bar for Glass Roofs and similar Structures.
I, WILLIAM CLARK of 60 Oxford Street, Reading, in the County of Berks,
Horticultural Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention of an improved Metallic Sashbar No. 10667 1884, has proved
extremely efficient in advancing the construction of glass roofs, but left something
to be desired in regard to the disposal of the moisture caused by condensation which
collects on the underside of the glass.
The present invention aims at supplying a system of glazing which in combination
with the sashbar hereafter described, effectually deals with the condensation
difficulty, by collecting the moisture formed beneath each glass pane upon a
specially formed bar, and conveying it to the outside of the pane immediately below
it, while at the same time the said bar forms a stop to prevent the upper panes
from slipping, and also acts in cold weather as a check to cold air currents or snow
which might find a way in beneath the glass. By covering the "purlines"
horizontal wood bars of the roof it also prevents their becoming rotted by the
moisture to which if uncovered, they are exposed.
"
or
My condensation bar while horizontal lengthways, is arranged to slope outwards
laterally, so as to afford the necessary fall for the moisture which drips upon it
from beneath the pane above. It forms therefore a sloping shelf near the lower
Dedge of the pane, and it projects outwardly towards the edge of the pane, and
there turns up vertically just sufficiently to afford a stop for the pane and so hold
it securely in its place. This outward lateral incline of the bar is not uniform and
even, but irregular and step-like so that ledges or hollows are formed which
prevent the moisture or snow from ascending into the house, even if impelled by a
high wind or drawn by capillary attraction. At the outer edge of the bar there is
formed a small gutter where the moisture ultimately collects and whence it finds its
exit by means of sufficient holes or outlets on to the exterior surface of the next pane.
To complete the condensation bar its innermost edge is turned over so as to form
a hollow tube by screws through which it is conveniently fixed to the purlines.
The bar is entirely formed of a single piece of metal, zinc being used by
preference and thus it assumes the outline or section of a tube joined to two sloping
steps and a small gutter with a high outer side.
In fixing this condensation bar I have found it possible and desirable to modify
and simplify the form of the sashbar described in my Patent of 1884.
In that Patent I described a sash bar which in section resembled two capital C's
placed back to back, their lower edges joined by a fold of the metal and their
summits connected by a loose arched metal capping and I claimed the right to use the
cap without the lower part of this combination. I now use the lower part of the
said sashbar without the cap merely reversing its position so that the fold of metal
which then lay beneath the two C's now forms a top piece over them, thus
dispensing with the necessity for any separate capping. My sashbar is therefore
formed in one piece of metal, and is fastened when preferred by nails of the ordinary
French wire pattern, the heads of which readily enter the groove in the bar below
what is now the top piece and are entirely covered by it.
By the combination of this simplified Sash Bar (which is merely a portion of the
bar patented by me in 1884,) and the Condensation Bar herein described, I accomplish

page_text: most effectuaily the glazing of any sloping roof or other similar structure without
putty, and free from the slightest drawback or inconvenience.
..
COMPLETE SPECIFICATION.
A Horizontal Condensation Bar in Combination with an Improved
Metallic Sash-bar for Glass Roofs and similar Structures.
1, WILLIAM CLARK of 60 Oxford Road Reading in the County of Berks,
Horticultural Engineer, 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 :-
My invention of an improved metallic or combined metal and wood sash bar
No. 10667, July 28th 1884 whereby efficient glazing can be done without putty,
has proved extremely effective in advancing the construction of glass roofs, but left
something to be desired in regard to the disposal of the moisture caused by
condensation which collects on the underside of the glass.
The present invention aims at supplying a system of glazing which in combination
with the sash bar hereafter described effectually deals with the condensation
difficulty, by collecting upon a specially formed condensation bar or capping as
shewn in Fig. 2, B, the moisture formed beneath each glass pane, and conveying
the said moisture to the outside of the pane immediately below it, while at the same
time the said bar forms a stop to prevent the upper panes from slipping, and also
acts in cold weather as a check to cold air currents or snow which might find a way
in beneath the glass. By covering the purlins, or horizontal wood bars of the roof,
it also prevents their becoming rotted by the moisture to which if uncovered they are
exposed.
My condensation bar while occupying a horizontal position lengthways, is
arranged to slope outwards laterally, so as to afford the necessary fall for the
moisture which drips upon it from beneath the pane above. It forms therefore a
sloping shelf near the lower edge of the pane and it projects outwardly towards
the edge of the pane, and there turns up vertically just sufficiently to afford a stop
for the pane and so hold it securely in its place. This outward lateral incline of
the bar is not uniform and even, but irregular and step like, so that ledges or
hollows are formed which prevent the moisture or snow from ascending into the
house even if impelled by a high wind or drawn by capillary attraction. At the
outer edge of the bar there is formed a small gutter G, where the moisture
ultimately collects, and whence it finds its exit by means of sufficient holes or
outlets on to the exterior surface of the next pane below it. To complete the
condensation bar its innermost edge is turned over so as to form a hollow tube D, by
nailing or screwing, through which it is conveniently fixed to the purlin. The bar
is entirely formed of a single piece of metal, zinc being used by preference, but
iron, lead, or copper, would do, and thus it assumes the outline or section of a tube
joined to two or more sloping steps, and a small gutter with a high outer side. In
fixing this condensation bar I have found it possible and desirable to modify and
simplify the form of the sash bar described in my Patent of 1884.
In that Patent I described a sash bar which in section resembled two capital Cs
placed back to back, their lower edges joined by a fold of the metal, and their
summits connected by a loose arched metal capping, and 1 claimed the right to use
the cap without the lower part of this combination. The two Cs are not necessarily
in contact there being usually a space between them, in which cavity nails or screws
could be placed, or an iron bar of L or T section could be inserted, to assist in
sustaining the weight of heavy glass.

page_text: now use the lower part of the said sash-bar without the cap as shown in Fig. 1,
merely reversing its position so that the fold of metal A which then lay beneath the
two C's, now forms a top piece over them, thus dispensing with the necessity for
any separate capping. My sash bar is therefore formed in one piece of metal, and
is fastened when preferred by screws or nails, of the ordinary French wire pattern, the
heads of which projecting upwards from the purlin readily enter the end of the groove
in the sash bar below what is now the top piece, or cap, and are entirely covered by it.
Or the sash bar can also be fixed by its under part at the lower end, being cut away,
so that the top projects and is bent down and held by a slot formed to receive it
in the condensation bar, or the top part of the sash bar can be cut off and the lower
part carried through the slot in the condensation bar as shewn in Fig 2, H. Another
mode of fastening the sash bar is by using a nail, the head of which slides inside the
cap of the sash bar, while the shank is bent at right angles to the head, and is
inserted horizontally in the back of the purlin under the condensation bar.
By the combination of this simplified sash bar (which is merely a portion of the
bar patented by me in 1884) and the condensation bar herein described I accomplish
most effectually the glazing of any sloping kind of roof or other similar structure,
with or without putty and free from the slightest drawback difficulty or incon-
venience.
In the accompanying drawings I have shewn in Fig. 1 a section of the simplified
form of sash bar, and in Fig. 2 I show it as fixed in combination with my new
condensation bar. In Fig. 3, I show this bar detached and enlarged.
To support the condensation bar I employ as a purlin, a wood bar having a notch
or rabbet N, taken out of one or both of its upper edges as shown in Fig. 2.
The folded hollow end D of the condensation bar sometimes rests securely in this
rabbet according to the pitch of the roof, and in that case cannot slip out of position.
This arrangement allows more space for the moisture which forins under the sash
bar to run on to the next condensation bar below it.
In the accompanying drawings P denotes the wood purlin, K the glass, and Z the
sash-bar.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is :-
1. A metal sash bar formed of one piece of sheet metal, shaped in section like the
letter OC but with a centre space between the two vertical curves, which have their
summits connected by a fold of the metal as herein explained and set forth.
2. In a system of glazing by means of metal sash bars, with or without putty, the
peculiarly formed metal condensation bar or purlin capping for collecting the
condensation water, sustaining the glass and protecting the wood purlin, as herein
explained and set forth.
3. In a system of glazing with or without putty the combination of the special
condensation bar and purlin cap with a wood purlin having a rabbetted upper
surface, and the metal sash bar herein described and set forth.
Dated this 19th day of April 1889
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.