A New or Improved Mandril or the like for Bending Metal Tubes thereon in the Manufacture of Certain Musical Instruments, also applicable for Bending other Tubes and Pipes.
Year: 1893

page_text: Date of Application, 13th Feb., 1893
Complete Specification Left, 13th Nov., 1893-Accepted, 23rd Dec., 1893
PROVISIONAL SPECIFICATION.
A New or Improved Mandril or the like for Bending Metal Tubes
thereon in the Manufacture of Certain Musical Instruments, also
applicable for Bending other Tubes and Pipes.
I, CHARLES JOHN EDWARD SMITH of 45, Wilson Street, Finsbury, in the
County of Middlesex, Manufacturer of Military Musical Instruments, do hereby
declare the nature of this invention to be as follows:-
This invention consists of a new or improved flexible metallic mandril or the
like appliance for bending metal tubes thereon in the manufacture of brass or other
metallic musical instruments such as cornets, horns, and the like instruments and
such mandril according to my present invention is also applicable for use in bending
other pipes and tubes as desired.
In the manufacture of brass or (the like) musical instruments-heretofore it has
been usual to prepare the pipe or tube ready to be bent into shape by filling the
interior of such tube with an easily fusible material (such as lead pitch or resin)
which when " set hard prevents the tube from collapsing when same is being bent
or formed into the desired curves or shapes. After the tube has been bent or
formed into shape the material is readily fused and run out.
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Now this process as heretofore adopted is both tedious and expensive beside
having other drawbacks such as the leaving behind in the interior of the tube some-
times of some part or particles of the fusible material by which the tone of the
instrument is injuriously affected.
Now according to my present invention 1 entirely dispense with such filling or
stopping of easily fusible material and instead thereof I have invented and use a
flexible metallic mandril constructed as follows:-
My flexible mandril is formed of a closely spirally wound or coiled metal rod
strip or wire (which latter may be of either a round square or other suitable shape
in cross section) and of a conical or tapering form down the sides thereof so as
to exactly fit and correspond with the taper or cone of the pipe or tube to
be bent.
The closely wound or coiled mandril thus produced while being very flexible
and free to be bent about in all directions yet keeps the tube perfectly round and
to a large extent reduces the puckering so noticeable in the old process.
A loop or hook or other suitable device is advantageously formed on the larger
end of my said flexible mandril so that after same has been inserted in the tube
or pipe and the latter bent or formed into any desired form or shape with the
flexible mandril inside the latter, can. then be seized and readily withdrawn
(owing to its very flexible character) from the interior of the bent or curved tube
For pipe.
DL: 1h 1 of 1902
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
A New or Improved Mandril or the like for Bending Metal Tubes
thereon in the Manufacture of Certain Musical Instruments, also
applicable for Bending other Tubes and Pipes.
I, CHARLES JOHN EDWARD SMITH of 45 Wilson Street, Finsbury, in the
County of Middlesex, Manufacturer of Military Musical Instruments, 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 consists of a new or improved flexible metallic mandril or the like
appliance for bending conical or taper metal tubes thereon in the manufacture of
brass or other metallic musical instruments such as cornets, horns, and the like
instruments and such mandril according to my present invention is also applicable
for use in bending other tapering pipes and tubes as desired.
In the manufacture of brass (or the like) musical instruments-heretofore it has
been usual to prepare the pipe or tube ready to be bent into shape by filling the
interior of such tube with an easily fusible material (such as lead pitch or resin)
which when "set" hard prevents the tube from collapsing when same is being bent
or formed into the desired curves or shapes. After the tube has been bent or
formed into shape the material is readily fusible and run out.
Now this process as heretofore adopted is both tedious and expensive besides
having other drawbacks such as the leaving behind in the interior of the tube of
some part or particles of the fusible material by which the tone of the instrument
is injuriously affected.
Now according to my present invention I entirely dispense with such filling or
stopping of easily fusible material and instead thereof I have invented and use a
flexible metallic mandril constructed as follows:-
My flexible mandril is formed of a closely spirally wound or coiled metal rod
strip or wire (which latter may be of either a round square or other suitable shape
in cross section) and coiled or spirally wound of a conical or tapering form down
the sides thereof so as to fit and correspond with the taper or cone of the pipe
or tube to be bent and usually of a greater length than such tube.
The closely wound or coiled taper mandril thus produced while being very
flexible and free to be bent about in all directions yet keeps the tube perfectly
round and greatly facilitates and expedites the bending of tubes.
A loop or hook or other suitable device is advantageously formed or mounted on
the larger end of my said flexible taper mandril so that after same has been inserted
in the tube or pipe and the latter bent or formed into any desired form or shape
with the flexible mandril inside the latter can then be readily withdrawn (owing
to its very flexible character) from the interior of the bent or curved tube
or pipe.
And in order that my present invention may be easily understood and readily
carried into practice I will proceed to describe same with reference to the drawings
hereunto annexed :-
Fig. 1 is a longitudinal view of a conical or tapering flexible mandril according
to my present, invention.-Fig. 14 being an end view of the larger end of the
mandril and Fig. 1B being similar view of the smaller end.
Fig. 2 is a longitudinal section of Fig. 1.
Fig. 3 shows a piece of conical tubing upon a flexible taper mandril (and bent
round to a semi-circular form) according to my invention.
Fig. 4 is a cross section on line 1-1 Fig. 3.
In the taper mandril illustrated c is a flat wire wound spirally on a rigid
taper mandril with the flat sides of the wire lying adjacent throughout this wire o
running from end to end of and forming the flexible taper or conical mandril

page_text: according to my invention; or this mandril may be formed in any other desired
manner suitable to produce a tapering flexible metallic mandril for the purposes
described.
d is a piece of taper metal tubing which after being placed over the taper
mandril c has been bent round to a semi-circular form upon such mandril see Figs. 3
and 4.
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The bending being finished the mandril c can be drawn out of the tube d in a
moment.
This mandril may be round oval or other suitable shape in cross section.
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 :-
A mandril or the like for bending internally-tapering or coned metal tubes
thereon consisting of a wire or the like spirally and closely wound so as to form a
tapering or conical shaped flexible metallic mandril substantially as and for the
purposes set forth.
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11: 19th dow of November 1893
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.