An Improvement in Sealing or Perfecting the Joints of certain kinds of Metal Pipes or Tubes used for Conveying Liquids, Steam, Gas, or Compressed Air.
Year: 1891

page_text: Date of Application, 25th Nov., 1891
Complete Specification Left. 23rd July, 1892-Accepted, 27th Aug., 1892
PROVISIONAL SPECIFICATION.
An Improvement in Sealing or Perfecting the Joints of certain
kinds of Metal Pipes or Tubes used for Conveying Liquids,
Steam, Gas, or Compressed Air.
I ROWLAND WATKIN LEWIS, of the firm of Edwin Lewis and Sons of
Patent Tube Works Wolverhampton, in the County of Stafford, Tube Manu-
facturers do hereby declare the nature of this invention to be as follows:
My said invention has reference to such metal pipes or tubes as are connected or
joined together by their ends being screwed into a tubular screw socket. The
screw ended metal pipes or tubes to which my invention is principally applicable
are the wrought iron service pipes or tubes used for conveying liquids, steam, gas
or compressed air but my said invention is also applicable to pipes or tubes made of
other metals or alloys and for other purposes.
The ordinary method of sealing the screwed parts of the connected pipes or tubes
by the use of white or red lead or other sealing cement is imperfect and the object
of my invention is so to seal the screw joint, by the use of white or red lead or
other sealing cement as to ensure the production of a very perfect liquid, gas, steam
or air tight joint by the act of screwing home the pipe.
Instead of screwing the pipe or tube to its extreme end as usual I reduce the
diameter of the extreme end so as to give the said extreme end a conical or concave
figure externally which reduced part when the pipe is screwed into the screw socket
leaves an annular recess or chamber for receiving a layer ring or packing of white
or red lead as hereinafter described.
In sealing the screw joint of the pipe according to my invention the white or red
lead or other sealing cement having been smeared upon the interior of the screw
socket, the screw ended pipe is screwed home in the said socket in the ordinary
way. As the screw ended pipe advances in the tubular socket the superfluous
white or red lead or other sealing cement is removed by it from the screw socket
and deposited in the annular space or recess between the conical or concave end of
the pipe and the socket. On the complete screwing home of the pipe there is
formed a ring, layer or packing of white or red lead or other sealing cement
between the extreme reduced end of the pipe and the interior of the socket so as
to fill up or seal the interstices between the screwed end of the pipe and socket and
thereby form a perfect joint.
The pressure of the liquid steam gas or air within the pipe and socket assists
in holding the packing or sealing material in its place at the reduced end of
the pipe.
Dated this 25th day of November 1891
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Sealing or Perfecting the Joints of certain
kinds of Metal Pipes or Tubes used for Conveying Liquids,
Steam, Gas, or Compressed Air.
1 ROWLAND WATKIN LEWIS, of the firm of Edwin Lewis and Sons, of
Patent Tube Works, Wolverhampton, in the County of Stafford, Tube Manu-
facturers do hereby declare the nature of my invention and in what manner the
D
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page_text: “
same is to be performed to be particularly described and ascertained in and by the
following statement:―
My said invention has reference to such metal pipes or tubes as are connected or
joined together by their ends being screwed into a tubular screw socket. The
screw ended metal pipes or tubes to which my invention is principally applicable
are the wrought iron service pipes or tubes used for conveying liquids, steam, gas
or compressed air but my said invention is also applicable to pipes or tubes made of
other metals or alloys and for other purposes.
The ordinary method of scaling the screwed parts of the connected pipes or
tubes by the use of white or red lead or other sealing cement is imperfect and the
object of my invention is so to seal the screw joint, by the use of white or red lead
or other sealing cement as to ensure the production of a very perfect liquid, gas,
steam or air tight joint by the act of screwing home the pipe.
Instead of screwing the pipe or tube to its extreme end as usual I reduce the
diameter of the extreme end so as to give the said extreme end a conical or concave
figure externally, which reduced part when the pipe is screwed into the screw
socket leaves an annular recess or chamber for receiving a layer, ring or packing of
white or read lead as hereinafter described.
In sealing the screw joint of the pipe according to my invention the white or red
lead or other scaling cement having been smeared upon the interior of the screw
socket, the screw ended pipe is screwed home in the said socket in the ordinary
way. As the screw ended pipe advances in the tubular socket the superfluous
white or red lead or other sealing cement is removed by it from the screw socket
and deposited in the annular space or recess between the conical or concave end of
the pipe and the socket. On the complete screwing home of the pipe there is
formed a ring layer or packing of white or red lead or other sealing cement between
the extreme reduced end of the pipe and the interior of the socket so as to fill up
or seal the interstices between the screwed end of the pipe and socket and thereby
form a perfect joint.
The pressure of the liquid, steam, gas or air within the pipe and socket assists
in holding the packing or scaling material in its place at the reduced end of
the pipe.
Figure 1 of the accompanying drawing represents in elevation the ends of two
screwed pipes to be joined to the screw socket represented in section, the extreme
end of each pipe being made according to my invention.
Figure 2 represents in longitudinal section the two screwed pipes represented in
Figure 1 screwed home in the screw socket and the joints of the pipes sealed or
perfected according to my invention.
The same letters of reference indicate the same parts in both figures.
a, bare the two screw ended pipes and is the screw socket for receiving the
screwed ends of the pipes. The reduced extreme end of each pipe is marked d, the
said reduced end having either a concave figure as represented, or a conical figure,
externally. The reduced ends d of the pipes a, b, when the said pipes are screwed
home in the socket, leave annular recesses or chambers for receiving the layers,
rings or packings of white or red lead or other sealing cement, such for example as
.asbestos paint or plaster of Paris. In Figure 2 the sealing material filling the said
annular recesses or chambers is marked e.
In sealing the screw joint of the pipes the white or red lead or other sealing
material is smeared upon the interior of the screw socket c and the screw ended
pipes ab are screwed home in the said socket e as represented in Figure 2. By
the advance of the screw ended pipes in the screw socket, the superfluous white or
red lead or sealing cement is removed from it and deposited in the annular spaces
or recesses between the conical or concave ends d of the pipes and the socket so as
to form rings, layers or packings of white or red lead or other sealing cement
marked e, e in Figure 2 in the said annular spaces or recesses.
The interstices between the screwed ends of the pipes a band the socket care

page_text: thus filled up or sealed and a perfect joint formed as will be understood by an
examination of Figure 2.
Having now particularly described and ascertained the nature of my inven-
tion and the manner in which the same is to be performed I declare that I
claim as my invention :-
The improvement in sealing or perfecting the joints of certain kinds of metal
pipes or tubes used for conveying liquids steam, gas or compressed air hereinbefore
described and illustrated in the accompanying drawing; that is to say, sealing or
perfecting the joints of those kinds of metal pipes or tubes which are joined
together by being screwed into tubular screw sockets by causing the superfluons
white or red lead or other sealing cement in the interior of the screw socket to be
deposited, on the screwing home of the pipes or tubes in annular recesses left
between the reduced conical or concave ends of the pipes and the interior of the
socket, thereby forming rings layers or packings of white or red lead or other
sealing cement between the reduced ends of the pipes and the interior of the socket,
which rings, layers or packings filling up or sealing the interstices between the
screwed ends of the pipes and the socket form a perfect joint substantially as
described and illustrated.
Dated the Nineteenth day of July 1892.