Improvements in the Making of Joints in Metallic Pipes or Tubes.
Year: 1898

page_text: Date of Application, 7th Jan., 1898-Accepted, 26th Feb,, 1898
COMPLETE SPECIFICATION.
Improvements in the Making of Joints in Metallic Pipes or Tubes.
I, REINHARD FELSCHE, of 20, Abendstrasse, Magdeburg-Newstadt, in the German
Empire, 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 improvements in means for effecting the junction of one
length or piece of metallic tube or piping with that of another, which is usually
accomplished by the means of soldering or brazing, which is expensive, tedious, and
to some extent uncertain and unreliable, but according to my invention I am enabled
to make such joints in less time, at less cost and with greater strength and durability
than is possible by the means above stated, and although the method of and means
for making such joints according to my invention applies to all metallic pipes or tubes
not afterwards exposed to an intense heat, the same is particularly adapted for
effecting the joints in cycle frames and the like.
The principle of my invention consists in forming an annular groove or channel
upon the outer surface of the ends of the smaller or male tube or length of pipe, and
a like or similar groove or channel upon the inner surface of the end of the larger or
female tube or length of pipe, a hole or holes being made in the larger or last named
tube or pipe communicating with the said groove or channel therein, and when the
respective grooves or channels of the two said tubes or pipes are brought together,
the annular space formed thereby I fill with molten metal, passed thereinto through
one of the said holes in the larger pipe, and the said metal when cold forms a strong,
durable and tenacious key for holding the said two tubes or pipes in firm and lasting
contact with each other.
As an example of my invention, and as an illustration of one method of carrying
the same into effect, I have hereunto appended a sheet of drawings, in which I have
chosen to delineate the principle of my invention as applied to the junction of the
ends of two lengths of tubing or pipes A and B, with a casting having two cylindrical
members C and D, as used in the building of cycle frames.
For the purposes of my invention, in such a case, in which the tube A is to be
inserted within and joined to the member C, and the tube B to the member D, I
provide upon the inner surface of the ends of C and D an annular groove or channel E
and E respectively which may be of any shape or configuration in cross section, and
either plain or smooth as at E, or grooved, threaded, serrated or otherwise roughened
as at E, and upon the outer surface of the ends of A and B I form, or provide by
indentation or other means, grooves or channels such as F F¹, in such positions as to
coincide with E and E¹ when A and B are placed within or forced into C and D as
shewn, and the said grooves or channels F may be of such formation as to correspond
with E or E' as may be desired.
In the members C and D, and communicating with the grooves or channels E
and E¹, I bore or otherwise provide any desired number of holes such as G, and into
one or the other of these I pour molten metal until the annular cavities or chambers
formed by the junction of F and E and F¹ and E¹ are filled, and the said molten
metal when cold forms an annular key which serves to bind A with C and B with D

page_text: firmly and securely, from which neither can be moved until heat has been applied
sufficient to remelt the metal occupying the said channels.
I may find it convenient or desirable to strengthen the ends of A and B before
being fixed within C and D, which I attain by welding, shrinking or otherwise fixing
in each a metallic lining such as H, preferably only of such width as to extend
from the end of A or B so far thereinto as to be level or thereabouts with the
ends of C and D as shewn.
In like manner I am enabled to form a junction between any two pieces or lengths
of tube or pipe capable of fitting one within the other.
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 :-
The improved method of and means for joining together any two pieces of
metallic tube or piping capable of fitting one within the other, consisting of the
forming of a groove or channel upon the outer surface of the smaller, and upon the
inner surface of the larger, and filling with molten metal the annular chamber thus
provided by the junction of the two said grooves or channels, substantially as herein
described and shewn by the accompanying drawings.
Dated this 7th day of January 1898.
GEO. THOS. HYDE,
1, Broad Street Buildings, London, E.C., Agent for the Applicant.