Improvements in and relating to Flexible Pipes or Tubes.
Year: 1894

page_text: Date of Application, 25th Aug., 1894
Complete Specification Left, 24th May, 1895-Accepted, 29th June, 1.95
PROVISIONAL SELERATION.
Improvements in and relating to Flexible Pipes or Tubes.
I, SALOMON FRANK, of 2 Bleichstrasse, Frankfort-on-the-Main, in the Empire
of Germany, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to flexible metallic pipes or tubes.
A metallic pipe or tube constructed according to my said invention is flexible
similarly as a hose of india-rubber, hemp or the like, and at the same time ensures
absolute tightness.
The pipe or tube is rendered flexible by providing it with spiral or annular
bulging folds. For the sake of greater safety 1 may place wires in the folds
turned inwards.
I may effect the folding of the pipe or tube in various manners. It is expedient
to repeatedly bend the wall of the pipe or tube by means of rollers, balls, or the
like, each time increasing the bend, and then to compress the folded pipe or tube
in the direction of its longitudinal axis, thereby producing bulging folds of the
desired shape.
•
Dated this 25th day of August 1894.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in and relating to Flexible Pipes or Tubes.
I, SALOMON FRANK, of 2 Bleichstrasse, Frankfort-on-the-Main, in the Empire
of Germany, 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 :—
My invention relates to flexible pipes or tubes.
The production of flexible and tightly-closing metal pipes or tubes has heretofore
been effected in two different ways, namely, first by connecting separate pieces by
means of flanging, indiarubber-tightening, soldering and similar methods and
second by forming a flexible pipe by means of pressure.
By means of the first mentioned method more or less flexible pipes are obtained,
but such pipes are very expensive and are not reliable as regards tightness of
the walls.
The second method has hitherto only been tried or carried out in the manner
illustrated in Figure 1 of the German Specification No. 41626, from which it can
be easily seen that such pipes though fulfilling their purpose as regards tightness,
do not possess the desired degree of flexibility, when produced in the manner
specified.
Supposing to indicate the radius of the inner and outer bulges, the distance
measured parallel to the axis of the pipe between the centres of the inner and
outer bulges in Figure 1 of the Specification referred to, is equal to 2r; in this

page_text: manner the corrugated sheet plates, which have been in use for a long time
especially in the manufacture of boilers, are obtained.
In the construction forming the object of this invention, the distance between the
centres is always smaller than 2 r, that is to say: the arcs are always larger than
the corresponding semi-circles; these circles are connected with one another by
means of transverse pieces which tangentially engage the arcs. As the arcs are
larger than the semi-circles, these transverse pieces will always be inclined to a
certain augle against the axis of the pipe; the length of the transverse pieces
varies considerably according to requirement and may decrease to a minimum, when
the arcs pass almost directly into one another; but in this latter case also the
tangent at the transition from one arc into the other will in no case present itself
at a right angle against the axis of the pipe but will be inclined with regard to the
same. It is only owing to this fact that the pipes receive the desired flexibility,
fulfilling at the same time the other important requirement namely that of a
perfect tight-closure.
Referring to the accompanying drawing,
Figure 1 represents a flexible metal pipe with parallel rings.
Figure 2 a flexible pipe wound helically; in both instances the outer bulges are
indicated by the letter a, the inner folds or recesses by the letter b and the
-connecting transverse pieces by the letters a b.
Figure 3 illustrates the direct transition from one are into the other and
Figure 4 represents a pipe in bent position into the inner bulge of which a wire
is inserted.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. A flexible metal pipe with bulging folds which are wound spirally or form
parallel rings; the cross section of the wall of the pipe presenting outer arcs (a a)
forming bulges, and inner arcs (6 b) forming the folds or recesses, the arcs being
larger than their normal semicircles and being so connected by transverse pieces a b,
that the lines formed by the said transverse pieces a 6 do not pass right angularly
but obliquely with regard to the axis of the pipe or tube.
2. In pipes or tubes, such as described in the first claim, the arrangement of
wires inserted into the folds or recesses (bb) said wires surrounding the pipe or
tube at its narrowest part.
Dated this 24th day of May 1895.
Dated this 24th day of May 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.