Improvements in Water-tube Boilers.
Year: 1893

page_text: Date of Application, 9th May, 1893-Accepted, 8th July, 1893
COMPLETE SPECIFICATION.
Improvements in Water-tube Boilers.
I, ARTHUR RODBERG, of Darmstadt, in the German Empire, Boiler-maker, 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 chambers of tubular boilers, in which the water
tubes at the front and back communicate with steam chambers as is the case in
"Belleville," " 65 Steinmüller," and the like boilers.
Heretofore such water chambers have been made flat in shape, whilst this
invention has for its object to form the same of separate cylindrically welded pipes,
into which the water pipes of the boiler are fitted. To enable to form a tight joint
between the cylindrically welded chamber and the said pipes, a circular opening is
formed in the said cylindrically welded chamber opposite each pipe end and adapted
to be closed by a cylindrically arched and in circumference also circular cover, with
bevel edge.
The said covers close the openings in the welded chambers from the inside, as
owing to the circular section of the welded chamber, in spite of the circular form
of the said openings and covers, by tilting, i.e. twisting the latter 90 degrees they
can be placed from the outside into the interior of the welded chamber. The cover
is secured in position tightly from the outside by means of a yoke in the well known
manner.
The arrangement described and combination of a cylindrically welded chamber
for tubular boilers and the arched connection of the water pipe resulting from the
circular form of the chamber gives a firm and tight joint, which cannot be attained
in flat chambers and by bending the water pipe ends in a straight plane, as the
action of heat does not alter the shape of the cylindrical water chamber and as
no stay bolts are necessary to resist internal pressure, the unequal action of stay
bolts is entirely dispensed with.
Another important feature in the combination of cylindrically welded chambers
with water pipe joints as described, is the simplicity of the internal joint thereby
attained.
The opening by which the joint is made may be quite circular by being drilled as
well as the cover by being turned, the introduction of the cover into the welded
chamber offering no difficulty whatever in practice. A simple turn of the said
cover is sufficient to bring it in position for fastening.
It will be evident that the said cover may be cylindrical and the opening in the
cylindrically welded water chamber conical.
And in order that my invention may be more fully understood I have caused to
be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures.
a is the cylindrically welded water chamber, having on one side the curved
holes n, n', n in which the water pipes are tightly secured and on the other side
opposite to the latter circular openings o furnished with covers d closing from the
inside, which must also be arched for the purpose of facilitating the insertion and
the edge of which may be bevelled or that of the opening o of the cylinder a.
the yoke by which the tighting of the cover is effected in the well known manner.
c is
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim, is-
1st. In tubular boilers, the application of a cylindrically welded chamber a

page_text: which serves for the reception of the front and back ends of the water tubes of the
boiler, the said tubes being tightly secured into the curved holes in the cylindrical
water chamber, substantially as and for the purpose set forth.
2nd. In the arrangement specified in the preceding claim, the use of a circular
opening o in the water chamber a to give access to the joint between the pipe and
water chamber a, in connection with-a joint cover d also circular in shape, which
closes from the inside and is introduced from the outside into the water chamber by
being tilted, substantially as and for the purpose set forth.
Dated this 8th day of May 1893
F. BOSSHARDT & Co.