Improvement in the Manufacture and Production of Cased or Covered Tubes.
Year: 1887

page_text: PROVISIONAL SPECIFICATION.
Improvement in the Manufacture and Production of Cased or
Covered Tubes.
I WILLIAM ALLMAN Manufacturer 45 Villa Road Handsworth Birmingham in the
County of Stafford, and also of the firm of Cope Allman & Co. Unity Tube Works
Icknield Square Birmingham in the County of Warwick do hereby declare the nature
of my invention for an "IMPROVEMENT IN THE MANUFACTURE AND PRODUCTION of
CASED OR COVERED TUBES" to be as follows:-
My invention consists in making and constructing a Mandrel drawn Cased Tube;
that is a Tube smooth inside and outside, made of 2 or more cases or metals
and consolidated by being made on a Mandrel; and also in the nature of the
materials used.
1 first form the inside or support by turning up a Tube out of flat zinc, steel,
or other suitable metal or alloy on a Mandrel, passing both metal and Mandrel
through a die.
I then put a case or Tube of brass or other suitable metal or alloy over the said
inside, the one fitting close to the other, in this form the combined tubes are again
passed through the die still internally supported by the Mandrel which consolidates
the casing and the inside making a strong and smooth yet light tube; when required
for heavier work, or for special purposes I put other cases or tubes either of the same
metal or any other kind of metal or alloy, on the outside of the other tubes and
repeat the process of drawing through the die until the Tubes are made of the required
strength and size.
Dated this 4th dow of Ion 1887

page_text: Improvement in the Manufacture and Production of Cased or
Covered Tubes.
WILLIAM ALLMAN Manufacturer 45 Villa Road Handsworth in the County of
Stafford 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:-
My invention consists in making and constructing a Mandrel drawn cased or
covered tube, either round or any other required section or shape, either plain or
ornamental, this tube is made of two or more cases of suitable metal or alloy, with the
first case, inside, or support formed on a mandrel, the second case pulled over the
first, and when they have passed through the round or shaped die, they form a
perfectly smooth tube both inside and outside, the several parts being consolidated
and finished before they are pulled off the Mandrel.
I first make the inside or support, by forming a case out of a flat strip of zinc,
steel, or other suitable metal or alloy, with an open or unsoldered joint, which is
produced by passing the flat strip of metal with a mandrel inside it through a die or
nole by means of an ordinary draw bench.
I then put a brazed or soldered case or cover of brass or any other metal or alloy
over the said inside or support while the inside remains on the Mandrel the case
fitting close over the inside, in this form the combined tubes or cases are again passed
through the die on the draw bench, still internally supported by the mandrel, this
process consolidates the said tubes and makes them form one strong and smooth cased
tube, the Mandrel is then extracted in the usual way and the tube is ready for
polishing.
ร
When I require stronger tubes for special purposes I repeat the above process and
put other casos either of the same or any other kind of metal on the outside of the
tube, formed of two cases as above, and again pass them through a die before
removing the Mandrel, repeating the process until the tubes are made the required
size, strength or shape.
In order that my invention and the method of putting the same into operation
may be thoroughly understood I will describe the drawings upon the sheet hereto
annexed which are to be taken as part of this specification and be read therewith.
Fig. 1 is a steel Mandrel used for forming the inside and making this tube
upon complete.
Fig. 2 strip of flat metal with one end cupped or bent up ready for the Mandrel
to be placed inside.
Fig. 3 strip after passing through the die closed on the Mandrel ready for the
case or cover.
Fig. 4 shews the case or cover pulled on the inside ready to pass through
another die.
i

page_text: Fig. shews the case or cover consolidated on the inside and either ready for
other coverings to be put on and passed through other dies, or ready for pulling off
completed with a singe cover.
Fig. 6 shews the tube after being pulled off the Mandrel.
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
First. The construction of a Mandrel cased tube, consisting of an inside and one
or more cases of metal consolidated altogether by being made and completed on the
same Mandrel.
Second. Forming the inside on a Mandrel out of flat strip metal.
Third. Using different metals for the cases and any required quantity over each
other, and consolidating them into one tube before they leave the Mandrel.
Dated this 4th dose of Ontaho 1047
WILLIAM ALLMAN.