Improvements in Flexible Tubes.
Year: 1887

page_text: Date of Application, 26th July, 1887.
Specification Accepted, 26th Aug., 1887
[Communicated from abroad by HERBERT KNIGHT of the City, County, and State
of New York, in the United States of America, Engineer.)
Improvements in Flexible Tubes.
1, JAMES YATE JOHNSON, of 47 Lincolns Inn Fields in the County of Middlesex,
Gentleman 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 relates to a flexible metallic tube and consists of two continuous
strips of metal and independent strips of packing, the metallic strips having flanges at
their edges, between which the strips of packing are inserted, one of the metallic strips
forming the inner part of the tube, and the other the outer part as hereinafter
described.
Referring to the accompanying drawing which forms a part of this Specification.
Figure 1 is a side elevation of the tube showing also how the parts are assembled
together.
Figure 2, is a longitudinal section of a portion of the tube.
In this Drawing, A represents a metallic strip having its edges turned outwardly
thereby formning Hanges B, C, as shewn in Figure 1. D is a similar strip having
flanges E F, turned the opposite direction to B, C. These two strips are assembled
together as shewn in the Drawing, the strip A with the outwardly extending flanges
being first turned and bent into shape, the strip D being bent around it afterwards.
Between the flanges E, C and B, F respectively are wound two strips of elastic
packing P, so that the joints will be secured from leaking and serve to prevent the
water, steam, air or other fluid that is passing through the pipe, from escaping.
The edges of the several flanges are made slightly rounded, so that when the pipe
is bent the edges will turn on the opposed flat surfaces of the metallic strip without
unnecessary friction.
The inner strip A is made of such a size as that it will press ontward, and the outer
strip D is made so that it will press inward, so that a continuous tight joint is always
maintained.

page_text: Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is :-
First. A tube formed of two or more continuous strips of metal which are helically
wound one upon the other and made to interlock with each other, and independent
strips between the flanges of the strips of metal providing an elastic packing at the
joints, substantially as shewn and described.
Second. The combination of the metallic strip A having outwardly extending
flanges B, C, and the corresponding strip D having the inwardly extending
flanges E, F with the elastic packing P, all arranged substantially as and for
the purposes set forth.
Third. The combination of the metallic strips over-lapping each other as shewn and
provided with the elastic packing between the contiguous flanges, the said flanges
having rounded edges whereby they are adapted to turn on the opposite flat surfaces
of the strips without unnecessary friction.
Fourth. The combination of the inner metallic strip wound helically and having
the outwardly extending flanges, the outer strip with the inwardly extending flanges
wound around the inner strip, and the two strips of elastic packing located as shewn,
the two metallic strips being so formed as to press towards each other for the purpose
of maintaining a tight joint.