Improvements in Mandrils for Use in the Manufacture of Boller Tubes with Internal Ribs.
Year: 1894

page_text: Date of Application, 26th Feb., 1894
'
• Complete Specification Left, 26th Nov., 1894-Accepted, 29th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Mandrils for Use in the Manufacture of Boller
Tubes with Internal Ribs.
I WALTER EYRE of the Atlas Steel and Iron Works, Sheffield in the County
of York: Engineer do hereby declare the nature of my invention to be as
follows:-
It has heretofore been found difficult to roll-weld ribbed boiler tubes on account
of the mandrils used sticking inside the tubes as the tubes are passed through the
rolls for welding them longitudinally.
My invention consists in an improved mandril by the use of which in the
manufacture of the said tubes this objection is overcome or almost overcome.
My improved mandril has longitudinal ribs arranged in numbers and distance
apart to suit the ribs in the tubes to be welded. The ribs of the said mandril are
placed so that the ends which first enter the tubes in the process of welding do not
come level with each other or in one plane at right angles to the axis of the mandril
but each succeeding rib is a short distance back from each preceding rib the first
rib being preferably longest, the next one shorter and the next to that shorter still
and so on successively round the mandril the shortest rib and the longest rib
preferably but not necessarily coming side by side.
Dated this 26th day of February 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Mandrils for Use in the Manufacture of Boiler
Tubes with Internal Ribs.
1 WALTER EYRE of the Atlas Steel and Iron Works, Sheffield, in the County
of York, Engineer, do hereby declare the nature of the said invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
It has heretofore been found difficult to roll weld ribbed boiler tubes on account
of the mandrils used sticking inside the tubes as the tubes are passed through the
rolls for welding them longitudinally.
My invention consists in an improved mandril by the use of which in the
manufacture of the said tubes this objection is overcome or almost overcome.
My improved mandril has longitudinal ribs arranged in numbers and distance
apart to suit the ribs in the tubes to be welded. The ribs of the said mandril are
placed so that the ends which first enter the tubes in the process of welding do not
come level with each other or in one plane at right angles to the axis of the
mandril but each succeeding rib is a short distance back from each preceding rib
the first rib being preferably longest, the next one shorter and the next to that
shorter still and so on successively round the mandril the shortest rib and the
longest rib preferably but not necessarily coming side by side.

page_text: Figure 1 is a side view and Figure 2 an end view of a mandril made according
to my invention. The ribs a having their ends a³ which first enter the tubes in the
relative positions hereinbefore described and as shewn in the drawing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
Mandrils for use in the manufacture of internally ribbed tubes the said mandrils
having the ribs placed so. that the ends which first enter the tubes in the process
of welding are in different planes at right angles to the axis of the mandril
substantially as herein before described.
Dated this 26th day of November 1894.
JOHNSONS & WILLCOX,
Agents.