Improved Machinery for Manufacturing Metallic Tubes or Metallic Cased Tubes and Rods.
Year: 1886

page_text: Improved Machinery for Manufacturing Metallic Tubes or
Metallic Cased Tubes and Rods.
We, JOHN EARLE and GEORGE BOURNE, both of Hooper Street, Spring Hill,
Birmingham, in the County of Warwick, Tube Manufacturers, 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:-
.
In manufacturing what is known in the trade as cased tubing it is usual to take
an open jointed iron tube and to draw on to it a brass brazed covering thereby
giving it the appearance of a solid brass tube. Another and cheaper method is to
dispense with brazing the casing by hooking and interlocking the two edges of the
brass strip of which it is formed and by afterwards passing the said strip through
dies and finally drawing it on to an iron open jointed tube. By this process there is
produced a cased tube similar in appearance to the before mentioned one, but having
an opening at the junction of the edges of the casing. When finished such a tube
is usually placed with the joint out of view of the spectator. Altho' cheaper than
the brazed tube, the process of hooking, binding, turning up the casing, and finally
drawing on the iron tube and finishing as heretofore practiced has been expensive
and complicated. Now our invention has for object the reduction of the number
of processes required for producing the hook-jointed case tubing or for making a
thin casing tube, without brazing if desired.
We will now proceed to describe by aid of the accompanying sheet of drawings
the process of making a cased-tube or rod or casing according to our invention.
Fig. 1 is a plan of a complete machine for preparing the casing and covering
tube.
Fig. 2 an end elevation of same at the inlet.
Fig. 3 a sectional elevation at A' B¹ with view of the outlet.
Fig. 4 a longitudinal sectional elevation through the centre of conically formed
plug.
Fig. 5 sectional elevation through C. D showing the form of the hollow plug
and brass strip.
Fig. 6 form of brass strip at C. D..

page_text: Fig. 8 sectional elevation at E. F. showing form of die and tongue for hooking
the strip.
Fig. 9 a section showing the form of brass strip at E. F.
Fig. 10 sectional elevation of tube and casing as it leaves the machine
preparatory to redrawing.
Fig. 11 section of tube after redrawing and is now finished.
We take the inner or open jointed iron tube or rod place it just through a hollow
conically formed plug A conveniently for taking hold of it by a pair of tongs. We
then take a strip of the covering metal, such as brass of the desired width to form
a covering and hook joint and place it in a cavity B formed by the conical hollow
plug and wall of the outer die. It is then. drawn to the same distance as the iron
tube, the tongs of an ordinary draw bench are applied to the two metals to draw
them through the machine; in so doing the casing is turned and hooked as shown
at Fig. 9. Finally the cased tube is drawn through a finishing die producing a tube
as shewn at Fig. 11. It is obvious that by placing the finishing die in position a
tube could be finished at one drawing, but two drawings are preferable. For casing
rods the process is similar to that for tubes. If the strip be drawn onto a mandril
there will be formed a casing only, or an ordinary tube.
Having thus particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, we declare that what
we claim.is: -
1. In machinery for manufacturing metallic tubes or metallic cased rods or tubes
a hollow plug through which passes the inner tube, rod or mandril, and around
which the strip forming the tube or casing is bent and hooked substantially as
described. .
2. The improved machinery for manufacturing tubes or metallic cased rods.or
tubes substantially as described with reference to the drawings.