Improvements in the Manufacture of Pipe Bends.
Year: 1891

page_text: Date of Application,. 21st. Oct., 1891
Compl te Specification Left, 21st July, 1892-Accepted, 15th Oct., . 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Pipe Bends.
.I, FREDERICK JOSIAH JONES of 61, Goldington Road, Bedford, Engineer, do
hereby declare the nature of this invention to be.as-follows:-
This invention consists in the manufacture of pipe bends, particularly those
intended to withstand internal pressure, from a spirally-wound strip of sheet metal
of a varying width suited to the diameter and radius of sweep of the pipe bond
to be made, the. edges of the strip being, preferably, of oppositely-sinuous form.so
that when the strip is wound spirally into a curved tubular form. the-abutting edges
will make a close joint.
The invention consists particularly in outwardly flanging the said edges: previous
to winding the strip and uniting them when wound by-electric or other welding.or
by brazing or rivetting together the abutting flanges with or without an inter-
mediate packing strip.
The invention further consists in combining with the said flanges a cap strip of
U-section wound upon and embracing the two flanges and secured by rivets passing.
through the sides of the cap strip and the enclosed flanges.
Instead of a separate cap strip the latter may he rolled in one with the:flange
at one edge of the tube-strip.
Dated this 21st day of October 1891.
F. J. JURED,
By. A. M. & W.m. Clark,
53; Chancery Lane, London, Chartered. Patent. Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Pipe Bends.
'I FREDERICK JOSIAH JONES of 61 Goldington Road, Bedford, "Engineer, 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 in the "manufacture of pipe bends, particularly those
intended to withstand internal pressure, from a spirally-wound strip of sheet-metal
(copper or steel) of a varying width suited to the diameter and radius of sweep of
the pipe bend to be made, the edges of the strip being, preferably, of oppositely
sinuous form so that when the atrip is. wound spirally into a curved tubular form
the abutting convolutions will make a close joint.
The invention consists particularly in outwardly flanging the said edges previous
to winding the strip.. and. uniting them when wound by rivetting together the
abutting flanges.
Reference is to be had to the accompanying drawings forming part of this
Specification, wherein Figure 1 represents partly in section a pipe bend constructed
according to my invention. Figure 2 is a face view, and Figure
a part sectional
side elevation of a machine suitable for making such bends. The strip having
been cut with its two edges of oppositely sinuous or wavy form, or with one
edge straight and the other edge sinuous, the pitch of the sinuosities depending
on the width of the strip and the intended diameter of the pipe, a flange is
turned up along each edge by passing the strip through suitable flanging rollers.
The width of the flange need only be sufficient for the purpose of rivetting, and
I find that a flange one inch wide is suitable for a pipe of 12 inches diameter.
ID 1

page_text: The strip is coiled into the form of a pipe bend by winding it on
a short
revolving mandrel A. For this purpose the end of the strip is secured to clamps b
on another mandrel carried by an arm B pivoted at a point c (coincident with
the radial centre of the intended bend) to a ring. C surrounding and concentric
with the mandrel A. This ring C is fitted to be revolved within a stationary
guide ring D by being geared by means of spur or other gear with the shaft A' of
the mandrel A, whereby the ring C is caused to turn simultaneously therewith.
An adjustable spring clip on the arm B which grips a friction quadrant E carried
by the ring C and concentric with the pivot c of the arm B causes the latter to
offer sufficient resistance to ensure the close winding of the strip. The mandrel A
is of about sufficient length .to receive two convolutions of the strip which as it
winds on abuts against a stationary guide fence or face plate F around the
mandrel. A whereby the portion of the strip being wound on, is caused to wedge
itself between the previously wound portion and the fence thus pressing the
abutting flanged edges into close contact and causing the coiled strip to slip off
the mandrel as fast as it is coiled, into tubular form. The pressure necessary
to bend the flanged strip, and cause it to. conform to the mandrel is applied by
rollers, carried by pressure levers, or equivalent means. Concurrently with the
winding of the strip on the mandrel A holes are punched in the abutting
flanges fat proper intervals apart, and rivets are inserted and rivetted therein
by any suitable portable punching and rivetting tool so that the coils are united
into a complete tube before being forced off the mandrel. When the pipe bend
is completed, the spiral joint between the flanges may if necessary be made
perfectly steam tight by being brazed internally or externally by means of a gas
blow pipe.
The necessary end flanges for coupling the bend to other pipes are affixed to the
ends of the bend so formed, by rivetting and brazing.
In some cases I may combine with the said flanges a cap strip of U section wound
upon and embracing the two flanges as illustrated in Figure 4 the said strip being
secured by rivets passing through the cap strip and enclosed flanges. This cap
would be a strip of. U section wound on to the flanges of the flanged strip at the
same time that the latter is wound into a spiral form.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The manufacture of pipe bends by spirally coiling a flanged sheet metal strip
of regularly varying width and uniting the abutting outwardly turned flanges,
substantially as specified.
Dated this 21st day of July 1909