Improvements in and relating to Screwed Joints for Combination with Metal Pipes and their Fittings.
Year: 1893

page_text: Date of Application, 13th Dec., 1893
Complete Specification Left, 13th Sept., 1894-Accepted, 13th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Screwed Joints for Combination
with Metal Pipes and their Fittings.
I, JAMES CHISHOLM of The Saracen Tube Works Washington Street Glasgow
in the County of Lanark North Britain Metal Tube Manufacturer, do hereby
declare the nature of this invention to be as follows:-
:-
This invention relates to the couplings or union joints for combination with hard
metal pipes which pipes are jointed together in various lengths and otherwise
connected by means of to and with such screwed couplings: also to taps valves
cocks and other fittings similarly connected to such pipes and has for its objects :
First, to render each such screwed joint proof against leakage under high
pressure.
Second, to effect perfectly tight joints in pipes occupying positions which are
difficult of access.
Third, to effect perfectly tight joints in pipes and fittings with ease and
rapidity.
In carrying out this invention in connection with the screw threaded couplings
and all kinds of fittings for steam or other metal pipes I construct a plain turned
recess at each open end of such fittings, which recess is slightly larger in diameter
than the screw threaded part and is of suitable depth to contain packing. When
the coupling piece is fitted upon the pipe each of these recesses is adapted for
effecting and serving the purposes of a stuffing box.
The screw threaded portion of the pipe usually extends outwards beyond the
end or ends of the coupling piece and is fitted with a screw threaded nut having a
turned projection thereon of corresponding dimensions to the recess before named
which projection adapts this nut for the purposes of a "gland" when the pipe is
inserted within the coupling piece and packing is fitted within the recess.
The parts being thus united this gland nut is then screwed up into the recess
pressing the packing up to the face of the joint at its rear end and therewith makes
a joint of exceptional strength and impenetrability.
As an alternative method instead of the gland nut just described a metal ring is
sometimes inserted in the recess after the packing is put in and the ring is pressed
inwards by means of an ordinary back nut fitted upon the screw threaded portion
of the pipe.
The devices herein described are applied either singly or in multiple arrangements
and not merely in connection with the particular two ended pipe coupling piece
herein described.
My invention is designed for application to the joints of metal pipes whether they
are made of iron brass or copper and is also applicable to valves and other kinds of
cast metal or wrought iron pipe fittings.
Dated this Twelfth day of December 1893.

page_text: Improvements in and relating to Screwed Joints for Combination
with Metal Pipes and their Fittings.
1, JAMES CHISHOLM of The Saracen Tube Works Washington Street Glasgow
in the County of Lanark, North Britain Metal Tube Manufacturer, 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 the couplings or union joints for combination with hard
metal pipes which pipes are jointed together in various lengths and otherwise
connected by means of, to and with such screwed couplings: also to taps valves
cocks and other fittings similarly connected to such pipes, and has for its objects;
First, to render each such screwed joint proof against leakage under high
pressure.
Second, to effect perfectly tight joints in pipes occupying positions which are
difficult of access.
Third, to effect perfectly tight joints in pipes and fittings with ease and
rapidity.
In carrying out this invention in connection with the screw threaded couplings
and all kinds of fittings for steam or other metal pipes I construct a plain turned
recess at each open end of such fittings, which recess is slightly larger in diameter
than the screw threaded part and is of suitable depth to contain packing. When
the coupling piece is fitted upon the pipe each of these recesses is adapted for
effecting and serving the purposes of a stuffing box.
The screw threaded portions of the pipes usually extend outwards beyond the
cnds of the coupling piece and each pipe is fitted with a screw-threaded nut having
a turned projection thereon, the dimensions of the projection being suited to the
recess before named which projection adapts this nut for the purposes of a "gland"
when the pipe is inserted within the coupling piece and packing is fitted within the
rccess.
These parts being united and the stuffing box suitably packed the gland nut is
then screwed up into the recess pressing the packing up to the face of the
joint at its rear end therewith making a joint of exceptional strength and
impenetrability.
As an alternative method to the above, instead of the gland nut just described, a
metal ring is sometimes inserted in the recess after the packing is put in and the
ring is pressed inwards by means of an ordinary back nut fitted upon the screw-
threaded portion of the pipe.
The devices herein described are applied either singly or in multiple arrangements
and not merely in connection with the particular two ended pipe coupling herein-
before described.
My invention is designed for application to the joints of metal pipes whether
they are made of iron, brass or copper and is also applicable to valves and other
kinds of cast metal or wrought iron pipe fittings.
The invention will be better understood if reference is made to the accompanying
drawings in which :-
Figure 1 is a sectional view shewing a straight coupling or joint piece uniting two
screwed metal pipes.
Figure 2 is a sectional view of a curved knee or bend coupling piece joining two
screwed metal pipes together in accordance with this invention.
Figure 3 is a sectional view shewing a three-way or T coupling piece made in
accordance with this invention.

page_text: Referring to the drawings A represents a screwed coupling piece made in
accordance with this invention for uniting screwed pipes together and the parts
marked B are screwed pipes for combination therewith. The parts marked a¹ are
stuffing box recesses, a are gland nuts, as are ordinary screwed back nuts, a is soft
packing and a is a metal ring for pressing it into the recess a¹.
The parts are operated in the following manner :-
The screwed pipes B, B,. are united to the screw threaded coupling piece A as
shewn in Fig. 1: soft packing at is then put in the recesses a' and pressed inwards
by means of the projecting parts as of the gland nuts a previously fitted upon the
pipes B. The recesses a¹ are sometimes plain as drawn and at others screw
threaded and the gland nuts a are made plain or screw threaded to correspond
therewith. Figure 2 represents an elbow coupling piece made in accordance with
this invention united to two pipes B, B, having one of the joints packed and
screwed up tightly with the gland nut a².
Alternative means for making up this kind of joint are shewn in Fig. 3, which
represents a three-way or T coupling piece with pipes B inserted: a is an ordinary
back nut and as a metal ring interposed between the packing a' and the back nut.
When the back nut is screwed up to the coupling it presses this ring and packing
into the recess and makes an exceptionally tight joint within the recess.
I am aware that stuffing boxes, glands and packing therefor have been combined
with machinery and various appliances for effecting tightness in spindles shafts and
rods working in journals prior to my invention: it will therefore be understood that
I do not claim these things broadly as my invention.
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 :-
First. In a screwed coupling piece for joining metal pipes together the combination
therewith of a stuffing box recess a¹ as and for the purposes herein described with
reference to the drawings.
Second. In a screwed coupling piece A for uniting metal pipes together the
combination therewith of a gland shaped nut a², a as and for the purposes herein
described with reference to the drawings.
Third. In a metal coupling or joint piece A for uniting screwed metal pipes
together the combination therewith of one or more recesses a¹ or gland nuts a as
and for the purposes herein described with reference to the drawings.
Fourth. In the screwed joints which unite metal pipes to their fittings the
combination therewith of the recess a¹ or gland nut a² a³ as and for the purposes
herein described with reference to the drawings.
Dated this Twelfth day of September 1894.
JOSEPH
LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Applicant.