Improvements in Apparatus for Coiling Metallic Pipes.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Coiling Metallic Pipes.
1, EDWARD NICHOLSON BESZANT, of 91 Belgrave Road, St. Michaels,
Liverpool in the County of Lancaster, Plumber, do hereby declare the nature of
this invention to be as follows:-
This invention relates to apparatus for coiling metallic pipes, and more especially
for coiling copper piping into the form of a helical tubular boiler suitable for a
domestic fire-place, such for example as the boiler described in the Specification to
Letters Patent granted to me, numbered 1370 and dated January 21st 1895.
In such boilers the convolutions of the coil are somewhat larger at one end than
at the other and instead of being circular, as in an ordinary helix, they are of
rectangular configuration with rounded corners; this renders the construction
somewhat difficult as the pipe cannot be coiled on a solid helical mandrel inasmuch
as it could not be subsequently removed therefrom.
In carrying out my invention therefore, I construct the mandrel of a central
rotatable piece adapted to carry and rotate the parts forming the peripheral
portion of the mandrel, on which a helical groove is formed such that as the pipe
is coiled therein, as the mandrel rotates, the pipe assumes the required shape; the
peripheral pieces, with the coiled pipe in position thereon, are then withdrawn
axially from the central part of the mandrel, and subsequently removed from the
coil through the centre thereof.
I prefer usually to make the central part of the mandrel of square cross-section,
and to form the periphery thereof of four pieces which fit on the four sides of the
centre part; these four pieces are so shaped that when in position a continuous
helical groove is formed of the desired configuration.
The central portion of the mandrel is mounted in suitable bearings, and is
rotated by a handle and spur gearing after the manner of a winch barrel, or, if
desired, by power.
In order to press the pipe into the groove as the mandrel rotates, instead of
depending upon tension, in which case the pipe would be apt to be distorted at the
rounded corners of the coil, I prefer to use a grooved wheel pivoted on a lever
which is adapted to press it against the pipe as the mandrel rotates; the lower
end of the lever is articulated to a nut traversed in a direction parallel to the axis
of the mandrel by a screw driven by suitable gearing.
The action of the apparatus is as follows;-
One end of the pipe is secured to one end of the mandrel so that it lies in the
helical groove, the mandrel is then rotated, and the grooved wheel is arranged to
press the pipe into the groove; as the mandrel rotates and the pipe is coiled
thereon, the lower end of the lever carrying the grooved wheel is traversed axially
by its screw an amount equal to the pitch of the helix for each revolution of the
mandrel, and as the wheel is pivoted on its lever it accommodates itself to the
angle of the helix, the edges of the wheel are arranged to bear on helical ridges
on the mandrel so that the pressure applied does not tend to flatten the pipe.

page_text: Suitable means are, of course, provided to secure the peripheral pieces in
position on the central portion of the mandrel.
Dated this 22nd day of August 1895.
SLOAN & LLOYD BARNES,
Castle Chambers, 26 Castle Street, Liverpool,
Agents for the Applicant.
Improvements in Apparatus for Coiling Metallic Pipes.
I, EDWARD NICHOLSON BESZANT, of 91 Belgrave Road, St. Michaels,
Liverpool in the County of Lancaster, Plumber, 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 to apparatus for coiling metallic pipes, and more especially
for coiling copper piping into the form of a helical tubular boiler suitable for a
domestic fire-place, such for example as the boiler described in the Specification.
to Letters Patent granted to me, numbered 1370 and dated January 21st 1895.
In such boilers the convolutions of the coil are somewhat larger at one end than
at the other and instead of being circular, as in an ordinary helix, they are of
rectangular configuration with rounded corners; this renders the construction
somewhat difficult as the pipe cannot be coiled on a solid helical mandrel inasmuch
as it could not be subsequently removed therefrom.
2
In carrying out my invention therefore, I construct the mandrel of a central
rotatable piece adapted to carry and rotate the parts forming the peripheral
portion of the mandrel, on which a helical groove is formed, such that as the pipe
is coiled therein, as the mandrel rotates, the pipe assumes the required shape; the
peripheral pieces, with the coiled pipe in position thereon are then withdrawn
axially from the central part of the mandrel, and subsequently removed from the
coil through the centre thereof.
In the accompanying drawings which illustrate my invention, Fig. I is an end
elevation, the mandrel being in section and a coil being shown in position in
process of formation, a part of the coil being broken away in order to more clearly
show the action; Fig. II is a side elevation, and Fig. III is a fragmentary plan,
in section on the line A. A. of Fig. I.
Throughout the drawings the same parts are indicated by the same reference
figures.
1 is the central part of the mandrel, of rectangular cross section, and 2 are the
peripheral parts of the mandrel, which are detachably secured thereto; the means
of attachment consist, at the inner end, of the recessed flange 3, and at the outer
end, of the detachable recessed cap 4 which is secured to the part 1 by the set
screws 5. It will be seen that as the ends of the parts 2 are adapted to fit within
the recesses, they can be firmly clasped on the central part 1 by affixing the cap 4
by means of the screws 5. The central part 1 is tapered in order to facilitate the
withdrawing of the peripheral parts, and is either made integral with or rigidly
secured to the shaft 6. This shaft is carried in bearings ou the main frames 7,
and is adapted to be rotated by means of the handle 8, the motion being conveyed
in the ordinary way through the shaft 9, spur pinion 10, spur wheel 11, shaft 12,
spur pinion 13 and spur wheel 14.
In order to press the pipe into the groove as the mandrel rotates, instead of
depending upon tension, in which case the pipe would be apt to be distorted at the
rounded corners of the coil, I provide the grooved wheel 15, carried in the jaw 16,
pivoted on the lever 17, which is adapted to press the wheel against the pipe as
the mandrel is rotated. The lower end of the lever is articulated to the nut 18 by

page_text: means of the cylindrical part 19, fitting within the socket 20 on the nut, and is
kept in place by the piece 21, pinned to the lever and forked so as to loosely
embrace the web on the nut, so as to limit the rotation of the lever 17 in the
socket 20 within narrow limits.
The nut 18 is mounted on the screw 22 which is rotated from the shaft 12 by
the chain gearing 23, 24 being a straining pulley carried on one of the main
frames 7.
The action of the apparatus is as follows;-
One end of the pipe is secured to the mandrel by the clamp 25 so that it lies in
the helical groove, the wheel 15 is arranged to press the pipe into the groove, the
necessary pressure being applied by means of a loaded chain attached to the upper
end of the lever 17, and the mandrel is then rotated. As the pipe is coiled
thereon, the nut 18 and with it the lever 17 and wheel 15 are traversed axially by
the screw an amount equal to the pitch of the helix for each revolution of the
mandrel; the object of the pivotal articulations between the wheel 15 and the
lever, and between the lever and the nut 18, is to accommodate variations in
the angle of the helix and any want of exact conformity between the axial
movement of the nut and that of the helix; the apparatus, is for example, shown
as operating on a helix in which the part of the convolution at present in gear
with the wheel is perpendicular to the axis of the mandrel.
The edges of the wheel 15 are arranged to bear on the ridges 26 between the
helical grooves, (see Fig. III) so that the pressure applied may not tend to flatten
the pipe.
While I have shown the apparatus as adapted to be operated by manual labour,
it is obvious that, if preferred, a pulley and belt, or any other of the well known
means of applying mechanical power, may be substituted for the handle 8.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. The hereindescribed improved apparatus for coiling metallic pipes, which
consists of a mandrel composed of a central rotatable part and helically grooved
peripheral parts adapted to be secured thereon; a grooved wheel adapted to
elastically press the pipe into the groove as the mandrel is rotated and capable of
accommodating itself to variations of pitch and angle of the helix; and means for
rotating the mandrel and traversing the grooved wheel; substantially as described
and illustrated.
2. In apparatus for coiling metallic pipes, in combination, the mandrel with
detachable peripheral parts, the grooved wheel, the weighted lever to which the
wheel is pivotally attached and which is pivotally attached to a nut adapted to
traverse axially as the mandrel rotates; substantially as described and illustrated.
3. The combination and arrangement of parts forming the improved apparatus
for coiling metallic pipes; substantially as described and illustrated.
Dated thi. 02nd der of Ma 1806
SLOAN & LLOYD BARNES,
Castle Chambers, 26 Castle Street, Liverpool,
Agents for the Applicant.
SLOAN & LLOYD BARNES,
Castle Chambers, 26 Castle Street, Liverpool,
Agents for the Applicant.