Process and Apparatus for Fixing Sheet Metal Rings on Metallic Tubes.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Process and Apparatus for Fixing Sheet Metal Rings on Metallic
Tubes.
I, CURT MAQUET, Engineer, of Eppelheimer, Landstrasse, 17-19, Heidelberg,
Germany, do hereby declare the nature of this invention to be as follows:-
This invention relates primarily to the manufacture of heat radiators consist-
ing of thin metal tubes carrying a series of thin metal rings or gills, but is
applicable generally to the manufacture of thin-walled gill-tubes.
The object is, to provide suitable means for fixing the rings or gills on the tubes,
without soldering or brazing, in order that such tubes may be used with advantage,
instead of cast-iron gill tubes.
Rings having a clear diameter slightly less than the diameter of the tubes are
punched out of sheet metal and then pressed on to the tube by suitable appliances,
after the edge of the opening has been bent out sideways, so as to form a conoidal
bur or projection which exactly corresponds to the diameter of the tube. Fig. 3*
of the accompanying drawings shows such a ring, produced from the flat ring
shown by Fig. 3.
The bulged rings are then mounted on the tube, and by means of suitable press-
ing or stamping appliances, the conoidal bur is pressed back into the
plane of the ring. This process may, however, be reversed, the ring
being mounted on the tube in a flat state, and then the wall of the tube
pressed outward by means of a conical or annular mandrel, so as to produce an
intimate joint between the rings and the tube wall. These mandrels, which are
movable in the tube, may be adapted to turn like a screw spindle.
In the accompanying drawings;
Fig. 1 is a longitudinal section of the apparatus for pressing the rings on to the
tube.
Fig. 2 is an end elevation,
Figs. 3 and 3 show the rings or gills in different stages of manufacture.
Fig. 4 is a side view, of a finished gill tube.
Figs. 5 and 6 represent two modifications.
As illustrated by Fig. 1, one of the flanges of the tube a is fixed to a table by
means of suitable screws c, subsequently a ring b is slid on to the tube, and then a
scissor shaped anvil or holder is laid around the ring.
As represented by Fig. 2, the holder has two cheeks d, e, which are hinged
together like scissor blades and provided with balance weights, so that the cheeks
of the holder will close together automatically, after it has been laid on to the tube.
Subsequently one of the rings g, as shown by Fig. 34, is slid on to the tube a and
compressed by a tubular press block A moving in the direction of the arrow, so
as to flatten the conoidal bur or rim of the ring g, and to join it with the tube a.
When this is done, a second ring 6 is passed over the tube, the holder c applied
to the ring b, and the operation repeated.
According to the modification illustrated by Fig. 5 the rings or gills are passed

page_text: over the tube a in a flat state, while a conical mandrel B is introduced through
the tube. As the diameter of the mandrel is slightly larger than the bore of the
tube, the latter will be widened, and the walls of the tube will be pressed against
the inner edges of the gills.
In Fig. 6 the conical mandrel B is replaced by a ring C, which turns on its axis, 6
like a screw, while advancing through the tube, and produces the same effect.
Dated this 8th day of August 1898.
Process and Apparatus for Fixing Sheet Metal Rings on Metallic.
Tubes.
I, CURT MAQUET, Engineer, of Eppelheimer Landstrasse, 17-19, Heidelberg,
Germany, 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 primarily to the manufacture of heat radiators consist-
ing of thin metal tubes carrying a series of thin metal rings or gills, but is
applicable generally to the manufacture of thin walled gill tubes.
The object is to provide suitable means for fixing the rings or gills on the tubes
without soldering or brazing, in order that such tubes may be used with advantage
instead of cast-iron gill tubes.
Radiators made by my new process are lighter than those made of cast iron, and
can be conveniently made of any desired size, and their heat conducting power is
greater than that of cast iron radiators.
Rings having a clear diameter slightly less than the diameter of the tubes are
stamped out of sheet metal and then pressed on to the tube by suitable appliances,
after the edge of the central opening has been bent out sideways, so as to form a
conoidal bur or projection which exactly corresponds to the diameter of the tube.
Fig. 3 of the accompanying drawings shows a ring, produced from the flat ring
shown by Fig. 3.
The bulged rings are then mounted on the tube, and by means of suitable press-
ing or stamping appliances the conoidal bur is pressed back into the
plane of the ring. This process may, however, be reversed, the ring
being mounted on the tube in a flat state, and then the wall of the tube
pressed outward by means of a conical or annular mandrel, so as to produce an
intimate joint between the rings and the tube wall. These mandrels, which are
movable in the tube, may be adapted to turn like a screw spindle.
In the drawings filed with the Provisional Specification:
Fig. 1 is a longitudinal section of the apparatus for pressing the rings on to the
tube; Fig. 2 is an end elevation; Figs. 3 and 34 show the rings or gills in different
stages of manufacture; Fig. 4 is a side view of a finished gill tube; Figs. 5 and 6
represent two modifications.
As illustrated by Fig. 1, one of the flanges of the tube a is fixed to a table by
means of suitable screws i, subsequently an annular stay b is slid on to the tube,
and then a scissor shaped anvil or temporary base plate is laid around the ring.
As represented by Fig. 2, the anvil c has two cheeks, d, d, which are hinged
together like scissor blades and provided with balance weights z, so that the cheeks
of the anvil will close together automatically, after it has been laid on to the tube.
Subsequently one of the rings g, as shown by Fig. 34, is slid on to the tube a and

page_text: compressed by a tubular press block A moving in the direction of the arrow, so
as to flatten the conoidal ridge or rim of the ring g, and thereby to join it with the
tube a.
When this is done, a second stay 6 is passed over the tube, a holder c
applied to the stay b, and the operation repeated. The axial width of the rings b
depends on the number of gills g to be mounted on a given tube.
According to the modification illustrated by Fig. 5, the rings or gills are passed
over the tube a in a flat state, while a conical mandrel B is introduced through
the tube. As the diameter of the mandrel is slightly larger, than the bore of the
tube, the latter will be widened, and the wall of the tube will be pressed against
the inner edges of the gills. The gills g may be placed any desired distance apart.
In Fig. 6 the conical mandrel B is replaced by an inclined ring C, which turns
on its axis like a screw, while advancing through the tube, and produces the same
effect.
The loose ring C may, however, be perpendicular to the axis of the tube and
drawn through the same like the conical mandrel B.
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 process for fixing sheet metal rings on thin-walled metal tubes, for the
manufacture of heat radiators and for other purposes, which consists in first widening
the internal diameter of the flat sheet metal ring by pressing it sideways, so as to
form a ridge or conoidal flange having a clear width equal to the diameter of the
tube, then mounting the ring on the tube and pressing the conoidal flange or ridge
back into the plane of the ring, so as to form a permanent joint between the wall
of the tube and the ring, substantially as described.
2. Apparatus for pressing sheet metal rings on metallic tubes by the method
specified, chiefly comprising a tubular press block or die A, annular stays 6 and
temporary anvil plates c, substantially as described.
3. The process or means for fixing sheet metal rings on thin-walled tubes, which
consists in mounting the said rings on the tube at the required distances apart,
and then expanding the tube by causing a conical mandrel B to pass through the
same, substantially as described.
4. The process or means for fixing sheet metal rings on thin-walled tubes, which
consists in mounting the said rings on the tubo at the required distances apart-
and then expanding the tube by causing a ring C to pass through the same, sub-
stantially as described.
Dated this Orth day of August 1900
FAIRFAX & WETTER,
Agents, 37 and 39, Essex Street, Strand, London.