Improvements in Joints for Pipes and Tubes.
Year: 1893

page_text: Date of Application, 26th Aug., 1893-Accepted, 7th Oct., 1893
COMPLETE SPECIFICATION.
Improvements in Joints for Pipes and Tubes.
I, HENRY OLDROYD of Sagan, in the Empire of Germany, 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:-
As a result of the modern developments in boilers and machinery the motive
power is now supplied and used at a much greater pressure than heretofore. This
increased steam or other fluid pressure necessitates the use of stronger pipe and
tube joints than formerly and my invention has for its object to meet this necessity
by making a joint capable of resisting very great pressures.
The old forms of joint are not lasting as they are in direct contact with the
steam, water etc. and are thereby exposed to destruction. Moreover any increase
of pressure is liable to break them.
The new joint is durable, economical, and effective.
In carrying out my invention I insert, at the junction of the pipes or other place
of connection, a metal ring or cylinder which has a collar on its exterior surface
capable of being fixed between the abutting ends or flanges of the pipes or tubes.
And in order that my said invention may be properly understood I have hereunto
appended an explanatory drawing whereon:-
a, a shows, in section, the tubes to be connected.
b is the metal cylinder or ring which, as shown, is placed in the interior of the
tubes at their junction.
6' is the collar which extends around the exterior of the cylinder and is at right
angles thereto.
c, care packing washers.
When making the joint the cylinder is so inserted in the tubes a, a at their
abutting ends that the collar projects up between the flanges and packing
washers c, c.
The cylinder is, preferably, coated, before insertion, on its outside
with red lead so as to adhere firmly to the interior surface of the pipes.
The cylinder or ring may be made of any suitable metal and if lead, zinc, or
pewter is used the packing washers c, c may be dispensed with.
To insure a firmer hold the collar may be roughly punched or indented with
holes to right and left the frayed or torn edges of which grip into the packing
washers c, c as shown.
The pipe flanges are or may be, as usual, drawn tight together by bolts.
With my improved joint the fluid pressure in the pipe presses the cylinder, with
its red lead coating, tightly against the interior surface of the pipe and thereby
ensures a tight joint. The cylinder is prevented from lateral movement by the
collar. The washers c, c are protected and kept out of contact with the steam or
other fluid.
It may be mentioned that the packing washers are always retained in position
and are prevented, when tightly screwing up the flanges, from protruding on the
inside and lessening the effective internal diameter or passage way of the pipes.
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 :-
A tightening joint for pipes and tubes consisting of a cylinder or ring having an

page_text: external collar which is inserted between the abutting ends of the pipes or tubes,
substantially as hereinbefore set forth.
Dated this 25th day of August 1893.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.