Year: 1887

page_text: Date of Application, 25th Apr., 1887
Complete Left, 25th Jan., 1888
Complete Accepted, 6th Apr., 1888
1, SAMSON Fox, of the Leeds Forge, Now Wortley, Leeds, in the County of York,
Engineer and Ironmaster, do hereby declare the nature of this invention to be as
follows:-
This invention has reference to the manufacture of certain tubular parts of steam
boilers and in particular to flues of circular cross section with corrugations or ridges
and undulations, which represent annular ridges and grooves. Such tubular parts may
be constructed in various ways and of various forms, the cross sections being in all cases
.circular, and the object of my invention is to ensure the completion of such flues or
tubular parts to circular cross sections, for which purpose the flue or tubular part is
whilst bot (as I prefer) treated between a series of three or more rolls, or between rolls
or a roll and longitudinally movable plates or plate, that are external to the flue or
tubular part under treatment, and which rolls or roll and plates or plate have formed
on their peripheries and surface or surfaces designed to act upon the flue or tubular
part of a boiler to be treated ridges and undulations, or are equivalently formed in
such a way that by causing the flue or tubular part to be moved in a rotary senso
whilst embraced by the rolls or rolls or roll and plate or plates the desired external
formation and circular cross section will be imparted to it or ensured.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Certain Tubular Parts of Steam
Boilers.
I, SAMSON Fox, of the Leeds Forge, New Wortley, Leeds, in the County of York,
Engineer and Ironmaster, 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 has reference to the manufacture of certain tubular parts of steam
boilers and in particular to those of circular cross section with corrugations or ridges
and undulations which represent annular ridges and grooves.
Such tubular parts may be constructed in various ways and of various forms, the
cross sections being in all cases circular, and the object of my invention is to ensure
the completion of such flues or tubular parts to circular cross sections, for which
purpose the flue or tubular part is whilst lot (as I prefer) treated between a series of
three or more rolls, or between rolls or a roll and longitudinally movable plates or
plate, that are external to the flue or tubular part under treatment and which rolls or
roll and plates or plate have formed on their peripheries and surface or surfaces
designed to act upon the flue or tubular part of a boiler to be treated ridges and undula-
tions or are equivalently formed in such a way that by causing the fluo or tubular
part to be moved in a rotary sense whilst embraced by the rolls, or rolls or roll and
plate or plates the desired external formation and circular cross section will be imparted
to it or ensured.
In the annexed drawings are shewn methods of corrugating tubular parts of steam
boilers whilst hot, by external pressure according to my invention, similar letters refer
to similar parts throughout the several views.
Figs. 1. 2. and 3, shew the operation by means of three or more suitably driven
rolls a, a, a, formed with ridges and grooves or undulations on their peripheries corre-
sponding with those required to bo produced on the said tubular parts, one or more of
such rolls being caused to approach the other rolls during the process of corrugating;
b, is the tubular part under treatment.
Figs. 4, and 5, shew the process by means of suitably driven rolls a, a, having ridges
and grooves or undulations and a longitudinally movable plate c, also with ridges and
grooves or undulations formed on its surface opposite to the rolls, and travelling to
and fro, the said plate c, being caused to approach the two rolls a, a, or the said
rolls a. a being caused to approach each other or the plate c, during the process o
corrugating.
Figs. 6, and 7. shew the process by means of longitudinally movable plates c. c
having ridges and grooves or undulations on their surfaces that are opposite each othe
and travelling to and fro, the tubular part under treatment being between them and
caused to rotate by their movement; a roll d, placed at right angles to, between, and
across the said plates c. c, ensures the tube under treatment being placed with its axi

page_text: at right angles to, (and in the line of movement of) the plates c. c, and the corruga-
tions produced on the tube at right angles to its axis, the plates c. c. are caused to
gradually approach each other during the process of corrugating, or one plate only may
be caused to approach the other plate as the corrugations are being produced upon the
tube under treatment.
One of the plates c, may be fixed and the other travel to and fro, and gradually
approach the other as above referred to.
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 :-
Forming corrugations upon the tubular parts of steam boilers such as fire-boxes and
flues, by external pressure only, applied by means of three or more rolls or by rolls
and a longitudinally movable plate, or by longitudinally movable plates alone; the
said rolls and plates having ridges and grooves or undulations corresponding to those
required to be produced upon the tubular parts under treatment, all substantially as
hereinabove described and shown.