Improvements in Horizontal Tubular Boilers.
Year: 1889

page_text: Date of Application, 11th Nov., 1889-Accepted, 28th Dec., 1889
COMPLETE SPECIFICATION.
Improvements in Horizontal Tubular Boilers.
We, LYNCH WHITE, the Younger, and WILLLAM YEATS BAKER, trading as the
Thames Bank Iron Company, of Upper Ground Street Blackfriars, in the County of
Surrey, Ironfounders, 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 to the description of Cast-iron tubular boilers referred io
in our British Patent No. 9090 of 1888 which are employed for heating Greenhouses,
Conservatories, and other buildings by means of hot water pipes, or coils and is
designed to still further improve such boilers in several respects.
It consists of six various improvements in detail, all tending to make the boiler
more efficient and convenient, or to obviate difficulties encountered in actual use, or
in replacing breakages or worn out parts.
We will now proceed to explain the invention with reference to the accompanying
drawings in which Fig. 1 shews a side clevation of one of our improved boilers.
Fig. 2 shews a central section of pipes with double web.
(1) In the first place then, we attach the hollow end castings, W, to the pipes which
lie between them, by means of the short bolts, Y, as an alternative to using outside
long bolts from end to end.
These bolts pass throngh lugs, C, cast for the purpose on the pipes, A, and these
pipes are strengthened by a web, B, which runs from lug to lug, If preferred this
web can be placed on the reverse side of the pipe also.
Fig. 2 shews a section of the double webbed pipes A', which are employed as
horizontal pipes or fire-bars under the fire and which through the space between them
being diminished by the web increase the draught, thus aiding the combustion of
anthracite or other hard fuel. For this purpose the webs are placed horizontally.
(2) We also use internal long bolts, Z, Figs. 1 and 3, to fasten the end castings
together. These bolts run through the waterway of some of the pipes in a central
position so as to insure an equal pressure on the surface of the rubber ring R, which
forms the joint. To receive the head and nut of these bolts we form bosses, D,
Figs. 2 and 3, with either square or round recessos, E, on the outside of the hollow
end castings as shewn in Fig. 3. India rubber washers are placed under the Iron
washers and nuts of the bolts so as to form a water-tight joint.
(3) At each side on the summit of the hollow bridge or central casting, F, we
form a socket with corresponding spigot, S, on the horizontal pipe directly above it,
so as to connect the pipe, A, with a socket in the bridge, F, and allow an increased
flow of the heated water. This arrangement is shown in Fig. 1, as is also a pivotted
bolt and nut, T, which engages with lugs, V, on the central casting so as to hold the
pipe, A, in place.
(4) Our next improvement consists of the openings W for return of water at
lower sides of the front casting. We believe this arrangėment will greatly accelerate
the circulation of the water.
(5) Our fifth improvement is that of an adjustable stop or cap-plate, to close the
socket opening of hollow casting in case of a pipe giving way, and having to he
withdrawn. This arrangement is shewn in Fig. 5, and consists of a circular plate, G,
having an annular rib, G¹, on its underside and a hole in the centre through which
passes the bolt, P. There is also the cross-head, P¹, which is long enough to fasten
inside the socket and through which also the bolt, P, passes. Around the annular
rib is fixed an india-rubber washer R¹. The cross-head, P', and bolt, P, being
inserted, the plate, G, is placed on the outer end of the bolt, P, and the nut is then
put on and screwed up, so that the boiler can be used until the pipe can be replaced.

page_text: (6) Our sixth improvement consists of a special tube, O, for replacing a broken or
defective pipe. This tube is so formed that it can be inserted in the place of the old
one without taking the boiler apart. It is shewn in Fig. 6, and as will be seen
it has a plain collar, H, at one end. The other end L has two fixed angular lugs, 1,
and a loose collar K. This collar has two recesses U shewn on an enlarged scale in
Fig. 7 which allow it to slide back under the lugs I so as to free the spigot end
of the tube sufficiently to admit of the tube being inserted in its socket inside which
the usual india-rubber washer has been placed. When the end, L, has been pressed
in the socket sufficiently far to allow the other end, H, to enter its socket, the collar, K,
is disengaged from the lugs, I, I, and is turned half-round till the projecting ears M, M,
are in line with the lugs I, I. Then two curved tapered wedges, N, shewn in Fig. 8
are inserted between, K, and, I, and being driven home they tighten, K, against ita
india-rubber seat, and at the same time press, H, against a similar India-rubber seat
in its socket at the other end.
By this contrivanco workmen in the country can readily replace a broken pipe
without having to separate the boiler castings.
Fig. 4 is a detail drawing of the bolt T and lugs V, V.
Having now particularly described and ascertained the nature of our said Inven-
tion, and in what manner the same is to be performed, we declaro that what we
claim is
1
In Horizontal tubular boilers for heating purposes the use of the cast webbed
pipes A, A, with or without lugs, C, the short bolts, Y, connecting front and back
castings to said pipes, the long bolis, Z, and recessed bosses, D, the Tee branch
pipe, S, and the adjustable bolt, T, and lugs, V, connected to Bridge or central casting,
the return pipes in front casting, W, the circular cover plate, bolt, and cross
head G, P, P, for closing sockets temporarily, the adjustable tube, O, with lugs,
-
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.