An Improved Method of Jointing Tubes.
Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Comptroller General of the 17th day of October 1898.
Date of Application, 7th May, 1897
Complete Specification Left, 7th Mar., 1898-Accepted, 7th May, 1898
An Improved Method of Jointing Tubes.
ALFRED RENÉ UPWARD, Consulting Engineer, and ROBERT DALMER, Gentleman,
bath of 19, Old Queen Street, Westminster, S.W., do hereby declare the nature of
this invention to be as follows:-
This invention relates to a mechanical method of jointing tubes. Within the
inner tube of those to be jointed we insert a plug (box wood may be used) the
inner tube is now placed within the outer tube, socket or collar to which it is to
be joined. We now apply sufficient mechanical force to punches or teeth suitably
shaped, and mounted, causing these punches or teeth, by embracing the outer tube,
to force both it and the inner tube into coincident indents, perforations or partial
perforations, thus rigidly locking the tubes together the above mentioned plug
acting both to enable the tubes to withstand the great mechanical force used in
producing the indents, perforations or partial perforations, and also permanently
adding to the rigidity of the joint. If for any purpose it is wished to get rid of
the plug after the joint is completed, it may either be burned out, or formed of a
hard substance moulded on its outer surface in the form of a screw, so that it can
be withdrawn by unscrewing, in this latter case the indentations would be of
screw form.
100
A. RÉNÉ UPWARD.
R. DALMER.
An Improved Method of Jointing Tubes.
We, ALFRED RENÉ UPWARD and ROBERT DALMER, both of 19, Old Queen
Street, Westminster, London, S.W., Consulting 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:-
-
This invention relates to a mechanical method of jointing tubes. Within the
inner tube of those to be jointed we insert a closely fitting plug (which may be
of box or other hard wood and which may be saturated with any well-known
preservative substance) the inner tube carrying this plug is now placed within the
[Price 8d.]

page_text: outer tube socket or collar to which it is to be jointed; punches or teeth actuated
by sufficient mechanical force are now applied to the outer surface of the outer tube
or socket producing indents or perforations thereon, which indents or perforations
produce coincident indents or perforations in the inner tube, thus rigidly locking
them together, the plug above described acting both to enable the tubes or tube
and socket to maintain their true form during the punching process and also
permanently adding to the rigidity and strength of the joint..
In order that this invention may be fully understood we proceed to describe a
joint formed in accordance therewith without of course limiting the invention to
the particular case described; supposing the outside diameter of the tube which is
to be jointed to the socket or outer tube to be one inch, and the lap of the socket
over this tube to be say one inch and a quarter, the total length of plug used
may be about two inches and a quarter, so that it extends in both directions con-
siderably beyond the point of juncture of the tubes. The inner tube into which
the closely fitting plug has been inserted may now be placed within the tube or
socket to which it is to be jointed and a series of indentations formed on the face
of the outer tube or socket which series of indentations may consist of two rows
of three indents or partial perforations at equal distances apart around the
circumference of this tube or socket, the two rows being separated by about say
five-eighths of an inch. The indents, perforations or partial perforations may be
formed by that which is known as an ordinary steel punch driven by a hand
hammer, or if the metal of the tubes be specially thick, any of the well-known
methods used in punching or stamping machinery may be used, and when
required in such cases, these punches may take the form of clamps studded with
projections and thus being capable of producing a number of indentations or per-
forations at one stroke.
Referring to the drawings hereto Fig. 1 represents a section of a general example
of joint made in accordance with this invention: --
A, is the plug of wood or other suitable non-metallic material, it will be seen
that this plug extends some distance down the inner tube B, beyond the point of
junction of this tube B, with the outer tube or socket I), thus imparting stiffness
and rigidity to the joint at its weakest point.
c, c, are the rows of indentations.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we wish it to be under-1
stood that we are aware that it has been previously proposed to join tubes or.
tubes and sockets by means of internal liners or strengthening pieces, prepared
with grooves or indentations into which portions of the tubes or tubes and sockets
are pressed and we make no claim to such devices but we declare that what we
claim is...
1. The method of jointing, and rendering rigid the point of juncture of tubes
and tubes and sockets by the use of an internal solid non metallic plug, such plug
acting substantially as set forth and described.
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