An Improved Method of and Means for Joining Metallic Tubes.
Year: 1898

page_text: Date of Application, 15th Aug., 1898-Accepted, 29th Oct., 1898
COMPLETE SPECIFICATION.
An Improved Method of and Means for Joining Metallic Tubes.
I, RUDOLF RODERWALD, of 45, Kaiserstrasse, Magdeburg, in the German
Empire, Merchant, 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 a firm but elastic
junction between the end of one metallic tube or pipe and that of another of
larger or smaller diameter, which renders the said means particularly adapted
for use in the construction of the frames of cycles. +
Fig.
is a longitudinal section of one end of a metallic pipe or tube adapted
to fit within, and be connected (according to my invention) to, the end of a tube
or pipe of larger cross sectional diameter, as illustrated by Fig. 2 and herein-
after explained.
For the purposes of my invention I form in so much as may be necessary of
the end of the tube or pipe A intended to be the inner of the two to be united,
any number of external grooves or channels B, which may be in the form of
distinct and separate rings or annular channels, or one such continuous channel
or groove in spiral form, the said groove or grooves, channel or channels being
then filled, or partly filled with any suitable hard setting cement C, or metal
or metal composition, that may be melted at a low temperature, such for instance
as lead or lead composition. The second or other tube or pipe D is of such
cross sectional diameter that its end may be passed freely over, and fit upon the
prepared end of the tube A, and when in the desired position pressure or force
is brought to bear upon the outer surface of the tube or pipe D immediately
over the cement laden channel or channels, groove or grooves B, thus forming
upon the outer surface of the tube 1), a corresponding groove or grooves, channel
or channels E, and causing the corresponding portion or portions F upon the
inner surface of D to dip into the said cement-laden channel or channels B, as
at Fig. 2, the said cement when set hard forming a perfect, firm, but elastic
joint between the tubes A and D), such elasticity depending to some extent upon
the nature of the cement C, and when metal is used for the latter purpose, heat
must be applied to the inner surface of D for the purpose of melting the said
metal prior to forming the channel E, and protuberances F in the tube D.
It is obvious, that when the tube or pipe D is of such cross sectional diameter
as to fit within the tube A, the channel or channels, groove or grooves B may
be formed upon the inside of A, and be filled with suitable cement, in which case
the groove or grooves, channel or channels E would be formed upon the inside
of D, while the protuberances F would be upon the outside of same, so as to
engage in like manner with the cement C.

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:-
1st. The improved method of joining the ends of metallic tubes or pipes,
substantially as herein described and shewn.
2nd. The herein described method of joining together the ends of metallic
tubes or pipes by forming a groove or grooves, channel or channels, such as B
in the one, and filling the same with suitable cement, and a groove or grooves
channel or channels such as E, and protuberances such as F in the other, the
latter adapted to dip into the said cement-laden channel or channels B, sub-
stantially as set forth and shewn.
GEO. THOS. HYDE,
1, Broad Street Buildings, Liverpool Street, London, E.C.,
Agent for the Applicant.