Improvements in the Manufacture of Heat-distributing or Radiating Pipes or Tubes.
Year: 1897

page_text: Date of Application, 2nd Apr., 1897-Accepted, 5th June, 1897
COMT DIE STECIFICATION.
Improvements in the Manufacture of Heat-distributing or Radiating
Pipes or Tubes.
We, JULES GROUVELLE and HENRI ARQUEMBOURG, trading as La Société
Jules Grouvelle et H. Arquembourg, of 71, Rue du Moulin-Vert, Paris, in the
French Republic, Manufacturers, do hereby declare the nature of this invention
aud 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 manufacture of pipes or tubes, intended for use in
heating apparatus, having their exterior surfaces fitted with a number of discs or
gills" with a view to increasing the radiating surface of such pipes; the objects
being to facilitate the application of said dises or "gills," to reduce the weight of
the pipe, and to lessen the cost of production.
In the accompanying drawings, we have illustrated, as an example, a mode of
producing a disc or "gill" fitted pipe or tube according to our invention.
Figs. 1 and 2 are face views and Fig. 3 is a corresponding side elevation, of a
sheet or plate of metal (preferably possessing a certain degree of clasticity)
intended to form a disc or "gill," showing the progressive stages of manufacture;
Fig. 2 representing the disc as it appears when ready for being punched or
stamped out.
Fig. 4 is a perspective view of the sheet or plate, after being punched or stamped
out, and showing it in the form it assumes when finished, and adapted for being
applied to the exterior of a malleable metal pipe as a disc or "gill."
Fig. 5 is a view, partly in elevation and partly in longitudinal section, of a
portion of a pipe furnished with our improved "gills."
As will be seen by reference to the drawing, the plate A is first pierced in its
centre with a hole a. Theu four other holes a' are formed equidistantly along the
line of a circle struck from the centre of the plate, each hole a' being connected
with the central hole a by means of four radial slits; the holes a' and radial slits
being formed simultaneously by stamping or other convenient means. When
punched or stamped out, the sheet or plate A (Fig. 4) presents on one of its
surfaces the appearance of a divided collar or boss (formed by the four triangular
projections a) which is capable of passing easily along the smooth external surface
of a pipe B; the requisite number of "gills" being thereby rapidly applied
without difficulty and their adjustment on the said pipe B readily effected. This
last operation having been performed, the internal surface of the pipe B is
" worked " upon in such a manner as to cause the external surface of the said
pipe B to adhere closely to and be compressed into the internal surface of the boss
of each of the discs or "gills," whereby the latter are solidly fixed and retained in
position, as well as in perfect contact with the outside of the said pipe B, the heat
of which is to be transmitted and distributed. The "working" of the internal
surface of the pipe B, for producing the effect just referred to, may be
accomplished, in any case (that is to say, whether the pipe B be of ductile metal
or not), by means of a mandrel or expanding tool; and it will be necessary to
operate successively in the same manner on each of the pipes destined to receive
the heat-distributing discs'or "gills." Should the pipe B be composed of metal
possessing ductility, the effect in question may be brought about by means of fluid
pressure (liquid or gaseous); the operation being performed simultaneously on all

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the pipes to be fitted with the discs or "gills" whether their number be small or
large. It will be easily perceived that, by the mode of manufacture herein
-described, the discs or gille aro mounted in the most perfect manner; the
surface of the boss of the disc in contact with the pipe being reduced to the
smallest convenient dimensione.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, we claim :—
1. The improved manufacture, substantially as herein described, of gilled pipes
for heating purposes, and consisting in threading upon a malleable metal pipe
malleable metal gills produced in the manner set forth, the gills being secured
upon
the pipe by expanding the latter by hydraulic pressure, or by mechanical or other
.\neans.
2. The improved manufacture of gills from plate metal, substantially as herein
described, and consisting of punching and slitting a plate in the manner set forth
and bending the portions between the slits at right angles so as to form a divided
collar which embraces the heating tube.
Dated this 12th day of March 1897.
For the Applicants,
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.