Improvements relating to Pipe and Tube Joints.
Year: 1898

page_text: Date of Application, 1st Oct., 1898-Accepted, 7th Jan., 1899
.COMPLETE SPECIFICATION.
Improvements relating to Pipe and Tube Joints.
I, ELIAB Box, of 289, Broadway, Bexley Heath, in the County of Kent,
Architect and Surveyor, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:
This invention relates to an improved method of making pipe and tube joints,
for various purposes in the arts, by fluid pressure, and the chief feature of my
said invention is the employment of what 1 term a thimble for confining the
action of the fluid, so that substantially only so much of the pipe or tube is acted
upon as is within the socket to which it is to be secured. According to my
method, the joints are made singly and without involving extensive or expensive
plant, and the said method is therefore especially suitable for small manufac-
turers of cycles, for example, and others who cannot afford a great outlay in plant.
In the accompanying drawings, which illustrate one application of my inven-
tion by way of example,
Fig. 1 is a central longitudinal section of a tube A to be secured in a socket B,
the parts being assembled ready for the making of the joint.
68
"
Fig. 2 is a similar view of the same parts after the joint is made, and
Fig. 3 is a transverse section on the line x, x of Fig. 1.
The socket B is made barrel-shaped internally, or is otherwise recessed, but
studs b
in such a way as to have two or more projections or
on the inner
surface. This formation may be produced by casting or in any other suitable
manner. The thimble C for confining the fluid pressure is conveniently made
of thin steel, and shaped to conform to the interior of the pipe or tube. One
end is closed and preferably bulged inwards; the other end is open and may also
be bulged inwards, as shown, and has a screw-threaded neck c or other device
whereby it can be connected to the delivery pipe of a hydraulic pump by which
water or other fluid may be forced into the thimble.
To make the joint, the parts are assembled by placing the tube in the socket
and inserting the thimble in the tube as shown in Fig. 1, whereupon connection
is made with the pump and liquid is forced at a high pressure into the thimble
so as to press the walls of it together with the pipe or tube outward, thus forcing
the pipe to enter the recesses of the socket and engage all around with the wall
of the socket and with the studs where they occur, as indicated in Fig. 2. The
joint being thus completed, the pump is disconnected, but the thimble remains
permanently in the pipe or tube and by its presence greatly strengthens the joint.
By reason of the interlocking of the pipe or tube with the studs, it cannot turn
in its socket, nor can it push or pull out. Moreover, since the action of the fluid
pressure is confined to that portion of the pipe or tube within the socket, the
remaining portion of the pipe or tube is unaffected by the making of the joint.
and retains its original strength unimpaired. The joints are made one at a time.

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:-
1. The mode of securing a pipe or tube in a socket, which mode consists in
causing the pipe or tube to interlock with the socket by the insertion and enlarge-
ment therein of a metal thimble, substantially as, and for the purpose, set forth.
2. The use of a metal or like inextensible thimble having one end closed, in
combination with a pipe or tube and a socket having recesses and studs in its
inner surface, so that the walls of the pipe or tube may, by the expansion of the
thimble, be bulged into the recesses of the socket, and caused to interlock with
the studs, substantially as, and for the purpose, set forth.
3. A pipe or tube joint formed as described with reference to the accompany-
ing drawings.
GEORGE HARRISON,
35, Therapia Road, Honor Oak, London,
Agent for the Applicant.