We LYNCH WHITE the younger and
Year: 1888

page_text: Date of Application, 21st June, 1888
Specification Accepted, 27th July, 1888
"The
We LYNCH WHITE the younger and WILLIAM YEATS BAKER trading as
Thames Bank Iron Company" of Upper Ground Street, Blackfriars London S.E.
Ironfounders, and CHARLES JAMES WATTS of same address 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 :-
This invention relates more especially to the Cast Iron tubular boilers now so much
used for heating greenhouses, and the like purposes, and is designed to provide for the
contraction and expansion of the pipes and prevent the frequent fractures and
leakages which arise from the action of the fire on the sockets of the ordinary socket
joints now employed in such boilers.
The invention consists of three parts namely
(1) An improved method of forming the joints between the pipes and the front and
back Waterway Castings or hollow ends.
(2) An improved elastic packing and mode of compressing the same, and
(3) An improvement in the configuration of the casting at the back of the fire
known as the Return Water-way.
With regard to (1) the method we propose is to dispense with the ordinary outside
socket joint as now and hitherto used, and to substitute for it a recessed joint formed by
casting a fillet or collar near the end of the pipe and fitting the said collar easily into
a circular recess in the end castings, this recess having a step or shoulder projecting
within it which carries an elastic packing against which the collar of the pipe presses,
the spigot end of the pipe projecting beyond the collar and thus passing the step in
the recess of the socket so as to keep the packing in its place.
We thus obtain a steam-tight or water-tight joint and at same time allow sufficient
play for the expansion, and contraction of the metal. (2) In order to prevent the
destruction which would arise to ordinary packing, under the great heat to which it is
subjected by the action of the fire around the end of the pipe, we employ a superior
description of elastic packing, composed of a good quality of india rubber, or of india
rubber and asbestos or of woven asbestos, or of other suitable material, according to

page_text: the size of the fire and the consequently greater or less heat to which the boiler
is subjected. In order to ensure the security of the joints thus formed, lugs are cast
on to the end castings, and bolts of requisite length with screwed nuts are inserted in
the said lugs so as to compress the whole boiler firmly together. One very important
advantage secured by our improved joint is that the actual recess in which the pipes
join the end castings, and in which the packing is placed, is enveloped by the water,
and is therefore entirely protected from the direct action of the fire.
As regards the 3rd part of our improvements it consists in dispensing with the
cavity or depression on the upper side of the Return Water-way at the back of the
fire, and in making the casting higher than at present, thereby gaining increased fire
room and heating surface.
To allow the necessary flue space we construct the upper tubes of the boiler on a
slope, or cant, so that they ascend gradually from the front towards the back of the
boiler, and on each side of the Return Water-way casting, we place a support or
bracket to carry the outside pipe of the boiler.
In the accompanying drawings
Fig. 1 shows a section of our improved recessed socket joint.
ور
2 shows, our improved Return Water-way, casting.
A is the pipe.
B
" "
"
"
"
"
"
"
"
"
"
"
"
G
H
"
recess socket.
collar.
spigot or end of pipe.
elastic packing.
straight top of the Return Waterway Casting.
bracket to support the side pipe.
lug to receive the bolts.
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,
1st. In a tubular boiler for heating purposes the use of recessed water tight joints
enveloped in water, which allow for expansion and contraction, and which connect the
pipes of the boiler with the hollow ends or Flow, Return and Front castings, as herein
described and set forth.
2nd. In a tubular boiler as aforesaid the use of an improved elastic packing
capable of sustaining the great heat to which such boilers are frequently subjected,
and of bolts and nuts working in lugs, cast on the end castings for securing the joints
closed by the said packing, such packing being so placed as to be kept cool by being
surrounded by water as herein described and set forth.
3rd. In the tubular boiler as aforesaid the employment of a Return Waterway
Casting, at back of fire, having no depression on its upper end, as herein described and
set forth.
Dated this 21st day of June 1888.
S. S. BROMHEAD,
97, Newgate Street, E.C.,
Patent Agent.