Year: 1886

page_text: Date of Application, 5th Nov., 1886.
Complete Left, 29th July, 1887.
Complete Accepted, 7th Oct., 1887.
I JAMES ANDERSON of 100 Clyde Street, Glasgow in the County of Lanark, North
Britain, Engineer, do hereby declare the nature of this Invention to be as follows,
that is to say :-
My said Invention has for its object to improve the construction and operation of
machinery for making corrugated shells for boiler furnaces.
In carrying out my Invention I subject a flat plate of steel or wrought iron for
forming a furnace shell or part of one to a combined rolling and pressing operation
by which corrugations are formed in the plate. And the plate thus corrugated by the
first operation is subsequently passed through another part of the same or a similar
machine and is by a second operation bended into the cylindrical form, after which
the longitudinal edges of the plate are welded or riveted together.
The machine for carrying out my Invention comprises, a base frame with end
standards or housings for three rolls, two of which are in the same horizontal plane
whilst the third is above the other two and in the middle. The rolls are shaped with
corrugations corresponding to those intended to be formed in the plate, the projecting
parts of the lower rolls being opposite each other whilst those of the upper or third
rolls are opposite the depressed parts of the other rolls. On the base frame there is
carried on suitable guides a traversing table like that of a planing machine, and the
upper surface of this table or that of a changeable plate fixed upon it has corrugations
formed in it with the projecting parts opposite the depressed parts of the two lower
rolls. The gear giving the traversing movement is connected with that driving the
rolls so that the surface velocities of the rolls and corrugated plate may agree. The
steel or wrought iron plate to be corrugated is placed upon the traversing table and is
carried by it under the lower rolls which are forced downwards so as to apply the
pressure requisite for forming the corrugations in the plate; and after the plate has
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page_text: been corrugated it is passed between the two lower rolls and the third or upper roll to be
bended into the cylindrical form. The upper roll and its bearings are arranged so
that it can be withdrawn endways from the bended furnace shell.
The lower rolls are carried in movable bearings through which the necessary
pressure is applied to force them downwards or upwards as required. The pressure
may be applied by means of hydraulic cylinders acting directly on the bearings of the
rolls; I however prefer to arrange the hydraulic cylinders to act through levers or
eccentrics on the bearings in such manner that the effective pressure increases as the
rolls are moved down towards the traversing table or up towards the upper roll.
Dated this Fourth day of November 1886.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Machinery for Making Corrugated Shells for
Boiler Furnaces.
I, JAMES ANDERSON, of 100 Clyde Street, Glasgow, in the County of Lanark,
North Britain, 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, that is to say:-
My said Invention has for its object to improve the construction and operation of
machinery for making corrugated shells for boiler furnaces.
In carrying out my Invention I subject a flat plate of steel or wrought iron for
forming a furnace shell or part of one to a combined rolling and pressing operation
by which corrugations are formed in the plate. And the plate thus corrugated by the
first operation is subsequently passed through another part of the same or a similar
machine, and is by a second operation bended into the cylindrical form, after which
the longitudinal edges of the plate are welded or riveted together.
The machine for carrying out my Invention is represented on two accompanying
sheets of explanatory drawings, of which figure, 1, is a plan, figure, 2, a vertical
section, and figures, 3, and 4, sectional elevations. In these drawings the same
reference numerals are used to mark the same or like parts wherever they are
repeated.
On a base frame, 5, there are placed two massive end standards or housings, 6, 7,
for three rolls, two, 8, 9, of which are in the same horizontal plane, whilst the third, 10,
is above the other two and in the middle, One, 7, of the housings, hereinafter termed the
inner housing, is fixed, but the other, 6, is movable on the base frame, 5, for a purpose
hereinafter explained, being. moved when required by means of two screw shafts, 11,

page_text: driven by means of spurwheels, 12, from a central shaft, 13. The rolls, 8, 9, 10, are
shaped with corrugations corresponding to those intended to be formed in the plate,
the projecting parts of the lower rolls, 8, 9, being opposite each other, whilst those of
the upper or third roll, 10, are opposite the depressed parts of the other rolls.
On the base frame, 5, there is carried on suitable guides, 14, a traversing table, 15,
like that of a planing machine, and the upper surface of this table (or it might be
that of a changeable plate fixed upon it) has corrugations formed in it with the
projecting parts opposite the depressed parts of the two lower rolls, 8, 9. The gear
giving the traversing movement of the table, 15, is connected with that driving the
rolls, 8, 9, so that the surface velocities of the rolls and corrugated plate may agree.
The steel or wrought-iron plate to be corrugated is placed upon the traversing
table, 15, and is carried by under the lower rolls, 8, 9, which are forced downwards
so as to apply the pressure requisite for forming the corrugations in the plate; and
after the plate has been corrugated it is passed between the two lower rolls, 8, 9, and
the third or upper roller, 10, to be bended into the cylindrical form. The upper roll, 10,
and its bearings are arranged so that it can be withdrawn endways from the bended
furnace shell.
The lower rolls, 8, 9, are carried in movable bearings through which the necessary
pressure is applied to force them downwards or upwards as required. The bearing, 16,
at each end of each lower roll, 8, 9, is fitted in the inner arms, 17, of two-armed
levers, 17, 18, carried loosely on a shaft, 19, having bearings in the housings, 6, 7,
these housings which are of a hollow or box-like construction being formed with
recesses at the sides for the inner lever arms, 17, bearings, 16, and the end journals
of the rolls, 8, 9. The outer lever arms, 18, are connected by links, 20, to levers, 21,
on rocking shafts, 22, of which there is one at each side extending from one housing
to the other. Each rocking shaft, 22, has fixed on it at its middle a lever, 23, which is
connected to the ram or piston rod, 24, of an hydraulic cylinder, 25; and on admitting
water under pressure to one end or the other of each cylinder pressure is transmitted
through the connections which have been described to the rolls, 8, 9, so as to force
them downwards when the plate is being operated on between them and the traversing
table, 15 and so as to force them upwards when the plate is being passed between
them and the upper roll, 10, in order to be bended into a cylindrical form. The lower
rolls, 8, 9, are driven by means of spurwheels, 26, on their inner end journals in gear
with spurwheels, 27, fast on the shafts, or short spindles, 19, which carry the
levers, 17, 18, and which have fixed on them bevil wheels, 28. in gear with bevil
wheels, 29, on the upper ends of inclined shafts, 30. With this arrangement the wheels
keep equally in gear in all positions of the levers, 17, 18, and rolls, 8, 9. The inclined
shafts, 30, are driven by means of bevil wheels, 31, from a central main or first-motion
shaft, 13, which extends horizontally under the principal parts of the machine and
may be driven by means of fast and loose pulleys and a belt or in any other convenient
This same shaft, 13, has on it spurwheels or pinions, 32, for moving the
traversing table, 15, these pinions, 32, gearing with racks, 33, fixed to the underside
of the table; and the gearing is proportioned so that the surface velocities of the
table, 15, and of the lower rolls, 8, 9, may agree. Clutches are provided for engaging
and disengaging the various wheels on the shaft, 13.
way.
For the purpose of withdrawing the upper roll, 10, from the bended cylindrical
furnace shell, this roll is made with the journal, 34, which works in a bearing in the
inner housing, 7, as large as the projecting parts of the corrugations so that the roll
can be completely withdrawn through the bearing. And the upper roll, 10, is made
with a neck, 35, extending beyond its inner bearing, and having fitted to it loosely
two crossheads, 36, which rest on guide rails, 37, and serve to support the roll when
it is drawn away from the housings. The guide rails, 37, have their inner ends fixed
on the inner housing, 7, and their outer ends upon a frame standard, 38. The upper
roll, 10, is made hollow its interior, 39, being made to serve as an hydraulic cylinder,
and having in it a piston, 40, which is fixed on the inner end of a rod, 41, having its
outer end fixed to the frame standard. 38. The rod, 41, is made with two passages
through it, which passages communicate one through the piston, 40, with the inner

page_text: end of the cylinder, 39, and the other with the outer end, whilst the outer ends of the
passages communicate with suitable valve gear (not shown) by means of which water
under pressure can be directed so as to move the roll, 10, outwards or inwards as
required.
The rolls, 8, 9, 10, and the table, 15, are shaped so as to leave flat uncorrugated
borders along the sides of the plate for conveniently rivetting or welding one plate to
another or to a part of the boiler; and in order that a machine may be used for
operating on plates of different widths, the rolls, 8, 9, 10, and table, 15, are made with
movable pieces, 42. and rings, 43, which can be removed or applied to suit the width
of plate required. It is in order to facilitate the changing of the rings, 43, on the
rolls, 8, 9, 10, that the outer housing, 6, is made movable as hereinbefore described.
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-The improved combination of machinery for making corrugated shells for boiler
furnaces and comprising parts for corrugating flat plates and parts for subsequently
bending the corrugated plates cylindrically substantially as hereinbefore described and
as shown on the accompanying drawings.
2-The combination of a traversing table and a pair of rolls all having corrugated
surfaces for corrugating flat plates substantially as hereinbefore described.
3-The combination of three corrugated rolls for bending corrugated plates
cylindrically the said rolls being arranged and operated substantially as hereinbefore
described.
EDMUND HUNT,
Applicant's Agent.