IMPROVEMENTS IN THE METHOD OF AND APPARATUS POR MANUFACTURING CYLINDERS, PIPES, TUBES, AND SIMILAR ARTICLES
Year: 1864

page_text: PROVISIONAL SPECIFICATION left by Michael Henry at the Office of
the Commissioners of Patents, with his Petition, on the 5th August
1864. A communication from abroad by Victor Henry Sophie Frederic
Gueldry, of 33, Boulevart Saint Martin, Paris, France.
I, MICHAEL HENRY, of 84, Fleet Street, in the City of London, Patent
Agent, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN THE METHOD OF AND APPARATUS POR MANUFACTURING CYLINDERS, PIPES, TUBES,
AND SIMILAR ARTICLES," communicated to me from abroad by Victor Henry
Sophie Frederic Gueldry, of 33, Boulevart Saint Martin, Paris, France, to be
as follows:-
This Invention relates to the operation of drawing, and is chiefly applicable
to cylinders, seamless tubes, and other articles of copper, brass, or alloys, and
mixtures thereof, taken in a rough state after casting to be drawn while cold.
Heretofore the metal has been drawn through the die or drawplate by
means of the mandril, that is to say, by applying power, traction, or pressure
to the mandril, and thereby moving the metal though the hole, whereas
according to this Invention the power, pressure, or traction is applied to the
metal tube or other article to be drawn or shaped, which is thereby drawn or
forced through the hole, die, or drawplate. This may be done according to
one method by placing two blocks on the mandril, one at or near one end of
the tube or article to be drawn, a ring or collar being interposed between
them, and the other is behind the die or drawplate; power may be applied
to one or other of these blocks to force or draw the metal through the die,
drawplate, or hole.

page_text: Heretofore also dies, drawplates, and wordles have been so constructed that
the inside of their hole or opening, that is to say, the surface intended to press
on or be in contact with the metal to be drawn has been made very short or
shallow, in some instances almost a line's depth, so as to offer very little
contact or squeezing surface to the tube or other article, and so that it grips
or meets only a small portion thereof at a time as it passes along, or, in other
words, the contact surface may be described as annular, whereas according
to this Invention the die or drawplate or its equivalent is constructed with an
elongated hole, opening, or contact surface, or an elongated hole, opening, or
surface is provided, through which the metal is drawn or forced, that is to
say, the inside of the hole, or opening, or surface intended to press or be in
contact with the metal is made long and cylindrical, or of such other shape
as would correspond with the required external shape to be imparted to the
tube or article; and in contradistinction to annular, it may be described as
tubular, so that every portion of the outer surface of the tube or other
article is subjected to a protracted pressing action, the said tube or article as
it passes along being pressed, forced, or brought into contact with the pressing
or squeezing surface for sufficient time to reduce or remove the elasticity of
the metal or tendency thereof to crack.