IMPROVE- MENTS IN APPARATUS FOR CORRUGATING PLATES FOR FLUE TUBES IN STEAM BOILERS
Year: 1884

page_text: I FREDERICK DUMELLA ROSE of Flixton near Manchester in the County of
Lancaster, Engineer, do hereby declare the nature of my invention for "IMPROVE-
MENTS IN APPARATUS FOR CORRUGATING PLATES FOR FLUE TUBES IN STEAM
BOILERS," to be as follows:-
The object of the improvements is to accomplish the corrugation of plates to be
used in the construction of flues for steam boilers, more particularly for the corru-
gation of plates used in the construction of flues according to my invention
already provisionally protected under the Patents, Designs and Trade Marks
Act 1883 for "Improvements in the construction of steam boilers," dated
January 4th 1884 and numbered 633; and consists of an arrangement whereby
such corrugations are formed in the plates composing the flues of steam boilers, in
a peculiar manner; that is to say, the corrugations therein are tapered, being the
deepest, or of the maximum corrugation at one part of the flue, and tapering off
on each side to the opposite or other part thereof; which may be there formed
with a less depth of corrugation, or none at all.
To accomplish this, and to effect my improvements, I provide a suitable frame-
work of the requisite strength carrying two or more powerful rollers or bowls,
mounted upon axles or otherwise which take into journals, and are geared together
with cog wheels or other gearing.
These bowls may be composed of suitably hardened steel, chilled iron, or other
metals or substances capable of withstanding the necessary heat or pressure. The
rollers are cut or moulded into corrugations, which are tapered like unto the form
desired in the flue plates, the elevated portions of the corrugations in one roller or
bowl taking into the depressed portions of the corrugations in the other roller or
bowl, by which means, when the rollers or bowls are accurately set, so that their
points of maximum corrugations exactly coincide with each other, both rollers will
be free to turn when geared up. Suitable means are provided for bringing these
rollers closer or wider apart, so as to admit the thickness of the plates between
them. The plates may be passed between the rollers either in a hot or cold state,
and the apparatus may be provided or not with additional rollers, shears, or guides,
LDIZ

page_text: for bending the plates into the circular or oval form, or for turning or bending
flanges upon the same; or the plates may be corrugated after they have been
welded into rings, in which case one or more rollers or bowls are mounted in such
manner, that the rings can be passed over one of the rollers from the end thereof.
Variations in detail may be made without departing from the peculiar character
of the invention, which consists in the employment of rollers or bowls, with taper
or graduated corrugations or flutings on their surfaces for the purpose of imparting
by pressure like taper or graduated corrugations to the plates used in the construc-
tion of flue tubes in steam boilers, whether the same have been previously welded
into rings or not.
Dated this Twenty-eighth day of March 1884.
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester,
Agent for the Applicant.

page_text: I, FREDERICK DUMELLA ROSE, of Flixton, near Manchester, Engineer, do hereby
declare the nature of my invention for "IMPROVEMENTS IN APPARATUS FOR
CORRUGATING PLATES FOR FLUE TUBES IN STEAM BOILERS," and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement:—
The object of the improvements is to accomplish the corrugation of plates to be
used in the construction of flues for steam boilers, more particularly for the corru-
gation of plates used in the construction of flues according to my invention already
Patented under the Patents, Designs, and Trade-marks Act 1883 for "Improve-
ments in the construction of Steam Boilers," dated January 4th 1884 and
numbered 633, and consists of an arrangement whereby such corrugations are
formed in the plates composing the flues of steam boilers in a peculiar manner;
that is to say, the corrugations therein are tapered, being the deepest, or of the
maximum corrugation, at one part of the flue, and tapering off on each side to the
opposite or other part thereof, which may be there formed with a less depth of
corrugation, or none at all.
To accomplish this and to effect my improvements, I provide a suitable frame-
work of the requisite strength, carrying two or more powerful rollers or bowls,
mounted upon axles or otherwise which take into journals, and are geared together
with cog wheels or other gearing.
These bowls may be composed of suitably hardened steel, chilled iron, or other
metals or substances capable of withstanding the necessary heat or pressure.
The rollers are cut or moulded into corrugations, which are tapered like unto
the form desired in the flue plates; the elevated portions of the corrugations in
one roller or bowl taking into the depressed portions of the corrugations in the
other roller or bowl, by which means, when the rollers or bowls are accurately set,
so that their points of maximum corrugations exactly coincide with each other,
both rollers will be free to turn backwards and forwards with a reciprocating
motion when geared up. Suitable means are provided for bringing these rollers
closer or wider apart, so as to admit the thickness of the plates between them.
The plates may be passed between the rollers either in a hot or semi-molten, or
viscid, or cold state, and the apparatus may be provided or not with additional
rollers, sheers, or guides, for bending the plates into the circular or oval form, or
for turning or bending flanges upon the same; or the plates may be corrugated
after they have been welded into rings, in which case one or more rollers or bowls
are mounted in such manner that the rings can be passed over one of the rollers
from the end thereof.
Variations in detail may be made without departing from the peculiar character
of the invention, which mainly consists in the employment of rollers or bowls,
with taper or graduated corrugations or flutings on their surfaces for the purpose
of imparting by pressure like taper or graduated corrugations to the plates, metal,
rings, or tubes used in the construction of flue tubes in steam boilers, whether the

page_text: same have been previously welded into rings or not; and also in the motion given
to such bowls or, rollers.
But that the improvements may be better understood, I will by the aid of the
accompanying drawings proceed more fully to describe means employed by me,
DESCRIPTION OF DRAWINGS.
Fig 1 shews an end elevation, and Fig 2 shews a portion of the front view,
broken away, of apparatus arranged according to my invention. The same letters
indicate corresponding parts wherever they occur.
a, a, is the main framing, one end only of which is shown. b, b, are the corru-
gated rolls, and cc the sliding journal in which on end of the top roll turns, the
bottom roll turning in fixed journals by preference, although both may be made to
slide towards each other. d, d are the guide rolls of which three on each side are
shewn, although one on each side may be mostly all that is necessary. These guide
rolls are mounted radially in relation to the roller on which it is desired to turn
the plate or metal, and are shewn in connection with the top roller; but by
mounting them in relation to the bottom roller, the plate or metal may be turned
around such bottom roller. Sheers or guide plates may be added when it is desired
to alter the form of the flue tubes composed of the corrugated plates. ee are the
screws for adjusting the guide rollers; and ff the screw at each end of the machine
for adjusting the position of, and putting pressure upon the rolls. These two
screws may be geared together by means of mitre gearing and cross shaft, so that
one operation will actuate both screws if desired as will be readily understood.
Now the peculiar character of taper or graduated corrugations formed in rolls for
rolling rings or plates, combined with the fact that such rolls must be smaller in
diameter than the rings or rolled up plates to enable the latter to be slided off,
renders it necessary to give to the rolls a to and fro reciprocating action. That is
to say, the rolls turn in one direction as far as the corrugation extends, from the
minimum on one side through the maximum or maximums to the minimum on
another side, and then will turn back to the starting point. This necessary motion
may be accomplished in various ways, but by preference I employ gearing wheels gg
in connection with pulleys hh, which are driven by straps in the ordinary way.
The centre pulley runs loose while the two outside pulleys are fixed to the shaft.
The straps are used one open and one crossed, and the straps are slided to and fro
by the well known method (not necessary to be shewn) as employed in planing
machines and other machine tools now in use. When rolling hot or cold plates,
I prefer to construct the machine with the corrugated rollers mounted one above
another as shewn; but this is not essential, as they may be mounted at any
convenient angle with the horizon, and indeed when viscid or semi-molten metal is
desired to be passed through the rolls, they will be best mounted at a considerable
angle. To enable the bent plates or rings to be taken off the roll when completed,
the sliding journal is capable of being drawn off the end of the roll, when the bent
plate or ring may be drawn through the opening in the framework. This is most
conveniently done at the end opposite the gearing or driving end. The true face
of the sliding journal is held up to the sliding bar jj, by means of a cotter in the
shaft kk, or it may be by a large nut screwed on to the shaft, or by an adjustible
collar, or other means. It will be convenient to provide the sliding journal with
handles, or other means for taking the same off and on. The roll may be tempo-
rarily supported by means of a wedge or wedges, or by a crane and sling during
the operation of taking off one ring or bent plate and putting on another. Or the
plates may be put in straight in front of the rolls.
In case of using viscid or semi-molten metal, extra guides for preventing the
lateral spreading of such metal may be employed, and for seperating the plate from
the roll; or the roll may be constructed for this purpose collapsible. And in such
case of using viscid metal, the to and fro motion of the rolls may be somewhat
extended, by which means the two ends when formed may be welded together,

page_text: thus producing seamless corrugated tubes of any desired form of corrugation.
The corrugated rollers themselves may be constructed either solid, hollow, or be
built up in sections of one or more corrugations, and the rollers may be corrugated
their whole length or may have flat portions therein, according to the kind of plate
desired; and may be constructed to roll one single corrugation or more upon a
plate, tube, or hoop. The rolls may also be constructed conical in form, when
required for the rolling of flues tubes or plates for the same intended to be cone
shaped. And may be constructed for any size of plate, flue tube, or ring desired,
for land marine or locomotive purposes.
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
1st The employment of rollers or bowls formed with taper or graduated corru-
gations upon their surfaces for the purpose of imparting by pressure like taper or
graduated corrugations to plates, or metal, or tubes, or rings, whether such plates,
tubes, or rings are cold or hot, or the metal viscid, or semi-molten, in manner and
for the purpose substantially as shewn and described.
2nd The so arranging such taper corrugated rollers that they shall have a to and
fro, or reciprocating rolling motion upon their respective axes, in manner and for
the purpose substantially as shewn and described.
3rd The employment of viscid or semi-molten metal in conjunction with the
mechanism shewn with taper corrugations, whereby the tubes formed are made
seamless, or welded, or joined up, or not, in the machine; for the purpose and
substantially as described.
Dated this 27th day of December 1004
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester,
Agent.