Improvements in Means for Making Joints in Metallic Tubing.
Year: 1897

page_text: Date of Application, 14th Apr., 1897-Accepted, 12th June, 1897
COMPLETE SPECIFICATION.
Improvements in Means for Making Joints in Metallic Tubing.
We RICHARD Bock of 6 Tauentzienstrasse, and PAUL MÜLLER of 10 Sharnhor
strasse, both in Magdeburg, in the German Empire, Engineers, 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 :-
Our invention relates to improvements in means for effecting the junction between:
one piece of metallic tubing and another, and applies particularly in connection with
making the joints in the frames of cycles, and has for its object to provide a neater,
quicker, and more effectual and sounder joint than obtains by the means of brazing
or soldering as hitherto.
The principle feature of our invention consists in forming upon the outer surface of the
end of the smaller, and the inner surface of the end of the larger of two pieces of tubing.
to be connected and fixed together, a coating of tin or other metal capable of being
melted at a lower temperature than that necessary for melting the said tubing, or
where the ends of two pieces of tubing of equal diameter are to be joined together
by both being enclosed by a metallic collar socket or sleeve, the outer surfaces of the
ends of the said pieces of tubing, and the inner surface of the said metallic socket,
collar or sleeve would be so coated, and we may effect the said coating by the means
of an electric plating bath, and we effect the junction between the parts so coated by
exposing both to a suitable degree of heat, or to the influence of an electric plating
bath.
In carrying our invention into effect in so far as relates to the joining of the end
of a tube of small diameter within the end of a tube, boss or socket of larger
diameter, we file or otherwise clean the outer surface of the end of the former, and
the inner surface of the latter, and after coating such other parts of both as may be
necessary with grease or other suitable material to render the same of non-electrical
conductivity, we expose both in a copper, tin, zinc or other electrical plating bath
or baths until the said cleaned parts have become sufficiently coated therewith that the
one may fit cleanly and evenly within the other, when both the said plated parts may
be exposed to a degree of heat sufficient to melt or fluidize the said metallic coatings,
so that the one may incorporate with the other, and when this has been allowed to
cool the joint would be effected. Or we may effect the metallic coating of the said
parts by the means of tinning in the usual way, or by dipping both in a bath of molten
metal.
In carrying our invention into effect in connection with the junction of two equal
sized butt ended tubes, the said ends after being cleaned and coated with metal as.
stated may both be enclosed within a collar or sleeve, the inner surface of which has.
been coated in like manner, the junction of the three parts being effected by exposure
to heat as stated until the coatings incorporate. Or in lieu of the outer surfaces of
the ends of the said butt ended tubes being so coated, the inner surfaces of the ends
may be so treated, and be joined by a short length of tube or solid metal capable of
fitting into the ends of both the outer surface of which said junction piece or plug has.
been coated with fusible metal.
Or we may effect the junction of two lengths of tubing so butted together, by
exposing the said ends to the influence of an electric plating bath until an electric
deposit of metal has been formed thereon sufficient to constitute a collar, socket or
sleeve of such thickness as to firmly hold the two said ends together.
Or as a further modification of our said improved system, the said butt ended pieces.

page_text: of tubing may be enclosed by a collar, socket or sleeve of the same metal as them-
selves, the three said parts being so provided electrically, that when exposed to the
influence of the said plating bath, a deposit of metal may be formed upon the outer
surface of the ends of the tubes, and the inner surface (and may be the ends) of the
said sleeve, collar or socket, until all the said parts are electrically brazed and firmly
held in connection with each other.
In either of the foregoing methods of carrying our invention into effect, we may
find it desirable to jag, indent, cut or otherwise roughen the surfaces to be connected
together, in order to form a key for the metal to be electrically or otherwise deposited
thereon.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
.claim is
1st. The herein described systems and methods of forming joints in metallic tubes
and tubing, characterized by forming upon the surfaces of the parts to be joined
together a deposit of fusible metal, by electrolysis or other means, and the
incorporating of the two or more said deposits by the application of heat or electrolysis,
and the employment of the said systems and methods in the manufacture of
the frames and other parts of cycles, and for other purposes, substantially as herein
.set forth and explained.
2nd. In an improved system of and means for joining metallic tubes and tubing
when placed end to end or butted together, the employment of an inner tubular or
solid plug, or an outer collar, sleeve or socket embracing the two said ends, and the
formation, by electrolysis or otherwise, of a deposit of fusible metal upon the surfaces
of the parts to be connected, and the incorporating of the two or more said deposits
by the application of heat, substantially as herein described.
3rd. In an improved system for joining metallic tubes or tubing when piaced end
to end or butted together, the formation by electrolysis of a metallic collar, sleeve or
.socket, of proportionate strength, embracing and holding the said ends together,
substantially as herein described.
4th. In an improved system of joining metallic tubes or tubing, the herein described
method of forming a deposit of fusible metal, by electrolysis or otherwise, upon the
outer surface of the smaller and the inner surface of the larger, and incorporating the two
said deposits by the application of heat or electrolysis, substantially as herein set forth.
Dated the
:1 1007
GEO. THOS. HYDE,
1 Broad Street Buildings, London, E.C., Agent for the Applicant.