Improvements in the Manufacture of Welded Iron and Steel Tubes for Telegraph Poles and other Poles and Posts, for Hollow Shafts, and for other Purposes.
Year: 1886

page_text: Date of Application, 10th Aug., 1886.
Complete Left, 22nd Apr., 1887.
Complete Accepted, 27th May, 1887.
Improvements in the Manufacture of Welded Iron and Steel Tubes
for Telegraph Poles and other Poles and Posts, for Hollow
Shafts, and for other Purposes.
I JOHN CLARKE JOHNSON of No. 19 Bridge Street Wednesbury in the County of
Stafford Manager of Works do heroby declare the nature of this Invention to be as
follows:-
In welded iron and steel tubes for telegraph poles and other poles and posts it is
desirable that that end of the tube which forms the lower part of the pole should be
of greater strength than the other part. And in welded iron and steel tubes for
shafts and for various other purposes it is desirable that the tube should be stronger
at one or both ends than at the other parts.
My invention consists of the improvements hereinafter described in the manufacture
of welded iron and steel tubes whereby the said tubes may be strengthened at one or
both ends the said strengthening extending from the end of the tube to any required
distance towards its middle.
I will describe my invention in connection with a welded iron tube for a telegraph
pole.
I take a strip or plate of iron such as would be used in the ordinary manufacture
of a tube of the same size excepting that the said strip or plate is longer than the
strip or plate ordinarily employed the additional length of the strip or plate being
equal to the length of the part of the tube it is intended to strengthen. I fold or
double the additional length of the strip or plate upon the other portion so that there
is a double thickness of metal for a length equal to the length of that part of the tube
about to be made which it is desired to strengthen. I heat the strip or plate described
to a welding heat and bend it into a tubular form and weld its edges together in the
ordinary way the folded part being preferably inwards. The welded tube produced
has a double or nearly double thickness of metal at and near the end at which the
strip or plate was folded as described. The thickened and strengthened end of the
tube is made the lower end of the telegraph pole.

page_text: In the tube made as described there is a slight seam or additional thickening
running along the interior of the thickened part of the tube owing to the overlapping
of the edges of the folded part. Where it is necessary or desirable to prevent the
formation of the said seam its formation may be prevented by making the folded part
of the strip or plate a little narrower than the other part of the strip. When the strip
or plate is bent into a tubular form the edges of the strengthening part do not overlap
or overlap only to the slight degree necessary to produce a good weld.
When it is wished to strengthen the tube at both ends each end is treated in the
way described with respect to one end.
Dated thin Th 1
Ր .
1000
W. T. WHITEMAN,
Agent for the Applicant.

page_text: Improvements in the Manufacture of Welded Iron and Steel Tubes
for Telegraph Poles and other Poles and Posts, for Hollow
Shafts, and for other Purposes.
I JOHN CLARKE JOHNSON of No. 19 Bridge Street, Wednesbury, in the County of
Stafford Manager of Works, do hereby declare the nature of my Invention and in
what manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
In welded iron and steel tubes for telegraph poles and other poles and posts it is
desirable that that end of the tube which forms the lower part of the polo should be of
greater strength than the other part. And in welded iron and steel tubes for shafts
and for various other purposes it is desirable that the tube should be stronger at one
or both ends than at the other parts.
My invention consists of the improvements hereinafter described in the manufacture
of welded iron and steel tubes whereby the said tubes may be strengthened at one or
both ends the said strengthening extending from the end of the tube to any required
distance towards its middle.
I will describe my invention in connection with a welded iron tube for a telegraph
pole.
I take a strip or plate of iron such as would be used in the ordinary manufacture of
a tubo of the same size excepting that the said strip or plate is longer than the strip
or plate ordinarily employed the additional length of the strip or plate being equal to
the length of the part of the tube it is intended to strengthen. I fold or double the
additional length of the strip or plate upon the other portion so that there is a doublo
thickness of metal for a length equal to the length of that part of the tube about to be
made which it is desired to strengthen. I heat the strip or plate described to a
welding heat and bend it into a tubular form and weld its edges together in the
ordinary way, the folded part being preferably inwards. The welded tube produced
has a double or nearly double thickness of metal at and near the end at which the
strip or plate was folded as described.
The thickened and strengthened end of the tube is made the lower end of the
telegraph pole.
The said
Figure 1 of the accompanying Drawing represents in elevation and longitudinal
section the foot or end part of a welded iron or steel tube for a telegraph pole
strengthened according to my invention; Figure 2 represents a cross section taken
through the strengthened end or part of the tube and Figure 3 represents a cross
section taken through the tube above the strengthened end part.
strengthened end or part of the tube a is marked b the said end or part 6 having a
thickness of metal about double that of the part a of the tube as will be seen by
referring to the cross sections Figures 2 and 3. The strengthened part 6 of the tube
may extend from the end of the tube to any required distance towards its middle.

page_text: In making the strengthened tube Figures 12 and 3 I take a strip or plate longer
than the strip or plate ordinarily used the said additional length of the strip or plate
being equal to the length of the part of the tube to be strengthened and I fold or
double the additional length of the strip or plate upon the other portion as represented
in plan and edge view in Figure 4, where the doubled part of the strip or plate is
marked c, c. By the folding of the additional length of the strip or plate a double
thickness of metal is given to that part of the strip from which the strengthened end
of the tube is to be made. The strip or plate Figure 4 being heated to a welding heat
is bent into a skelp or partly made tube as represented in plan and cross section in
Figure 5 and the edges of the skelp or partly made tube are welded together in the
ordinary way. The pressure applied to the partly made tube for effecting the welding
of its edges together also effects the welding together of the doubled parts c, thereby
producing at that part a double thickness of solid metal as represented at 6 in the
sections Figures 1 and 2. A welded steel or iron tube of the kind represented in
Figures 1, 2 and 3 is thus produced. It will be seen that the strip or plate is bent
into a skelp with its folded part inwards but it may be bent into a skelp with its
folded part outwards. I prefer however the arrangement represented in the drawing.
The end of the tube when the said tube is used for making a telegraph pole
constitutes the lower end of the telegraph pole.
In the tube made as described there is a slight seam or additional thickening
running along the interior of the thickened part of the tube owing to the overlapping
of the edges of the folded part. Where it is necessary or desirable to prevent the
formation of the said seam its formation may be prevented by making the folded part
of the strip or plate a little narrower than the other part of the strip. When the strip
or plate is bent into a tubular form the edges of the strengthened part do not overlap
or overlap only to a slight degree necessary to produce a good weld.
Instead of making the strengthening piece e from an additional length of the strip
or plate as represented in the drawing the strengthening piece may be made at the
side of that part of the strip to be made into the strengthened part of the tubo, the
lateral strengthening piece of the strip being folded in the direction of the length of
the strip instead of cross wise as described and represented.
When it is wished to strengthen the tube at both ends, each end is treated in the
way described and illustrated with respect to one end.
Having now particularly described and ascertained the nature of my invention and
the manner in which the same is to be performed I declare that what I claim is :-
Strengthening one or both ends of welded iron and steel tubes for telegraph poles
and other poles and posts, for hollow shafts and for other purposes by the process of
manufacture hereinbefore described and illustrated in the accompanying Drawing;
that is to say, taking a strip of the proper length folding or doubling the end or ends,
or a portion or portions of the sides, of the strip upon the other portion so as to form
a double thickness of metal for a length equal to the length of that portion or portions
of the tubo which is or are to be strengthened, bending the strip or plate heated to a
welding heat into a tubular form and welding its edges and the doubled or folded part
or parts together substantially as described and illustrated.
Dated this Sixteenth day of April 1887.