Improvements in and relating to Pipe-couplings.
Year: 1899

page_text: Date of Application, 24th Oct., 1899--Accepted, 9th Dec., 1899
COMPLETE SPECIFICATION.
Improvements in and relating to Pipe-couplings.
We, CHARLES ALEXANDER BAILEY, Mechanic, and GEORGE WHITEFIELD STEVENS,
Gentleman, both of Cromwell, in the County of Middlesex, and State of Con-
necticut, United States of America, do hereby declare the nature of our invention
for improvements in pipe-couplings and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:—
This invention is an improvement in pipe-couplings, and it relates more
especially to peculiar means for attaching collars to soft metal pipes, in order to
provide a cheap, simple and durable connection, and also form a tight and secure
joint between the parts. To this end the invention contemplates the formation
of a peculiar thread in the collar which will readily cut or swage its own way upon
the soft metal pipe without twisting the latter or otherwise affecting the same.
The invention embodies the feature of slightly tapering the interior or bore of
the collar, and after screwing said collar on the pipe is expanded by means of
a tapered plug in order to further swage the threads and insure a tight, secure
and durable joint.
The following specification enters into a detail description of the invention,
reference being had to the accompanying drawings and to letters thereon which
designate the different parts.
In the drawings: Figure 1 is a sectional view showing the application of
the invention. Fig. 2 is an enlarged detail sectional view illustrating one form
cf thread. Fig. 3 is a perspective view of the collar. Fig. 4 is a sectional
view of a modification of the invention, illustrating the disposition of the parts
before the pipe is expanded. Fig. 5 is a sectional view, with the pipe expanded
embedding the threads thereinto. Fig. 6 is a modification, using the ordinary
V-thread.
Referring to said drawings, and more particularly to Figs. 1, 2 and 3, the
collar, designated by the letter A, is provided interiorly with a comparatively
thin thread a, running spirally around the innerside of said collar and leaving
plane surfaces a¹ at the base of said thread or rib. The beginning point of the
thread or rib a is preferably cut abruptly, as shown at a, and being sharp will
readily enter the pipe to start the thread thereon. The outer surface of the
collar is octagonal or formed with plane surfaces for the engagement of a wrench
which is to be used in turning the collar upon the pipe.
It will be understood that the collar is to be applied to a soft metal or lead
pipe, and the thin female thread or spiral rib will, when the collar is turned
upon the pipe, cut its way thereon or be swaged therein, massing the metal of
the pipe between the thread or rib to form a tight, secure and durable joint. By
the particular formation of the thread or rib in the collar no special tool is
required for forming a thread upon the pipe and therefore the operation of
coupling a soft metal pipe can be quickly and conveniently accomplished. This
construction of collar forms a simple, cheap and effective means of securely

page_text: attaching a collar to a soft metal pipe, the disposition of the thread or rib per-
mitting the operation to be effected without twisting or otherwise injuring the
pipe.
In the modification illustrated in Figs. 4 and 5 of the drawings, the interior
or bore of the collar B is slightly tapered in order that the thread or rib b, which
is similar to the thread a in Figs. 1, 2 and 3, will not fit tightly upon the pipe
when the collar is turned thereon, and before said pipe is expanded into the
threads or space between them. In applying this style of collar, the end having
the larger diameter is first screwed upon the pipe to start the thread thereon,
and then the collar is reversed or turned end for end and screwed on, as shown
in Fig. 4, after, which a tapered plug C, is driven into the end of the pipe to
slightly expand the latter and form a more secure joint. It will be noted of
course that but a slight expansion of the pipe is required. In this modification
of the invention I may use the ordinary V-thread, as the operation of forming
a tight and secure joint is performed by expanding the pipe, while in the form
shown in Figs. 1 and 2 it is intended that the straight collar fit tightly on the
pipe.
The practical advantages of such a collar forming a coupling with a soft
metal pipe will be apparent to those skilled in the art to which the invention
relates, the important advantage being that a coupling can be effected with ease
and rapidity, and having the collar swage its own thread a tighter and more
secure joint can be had. It is also contemplated to employ the tapered collar
in making a hose-coupling, and in this application of the invention the tapered
plug shown in the drawings would be supplanted by an oppositely tapered
hollow plug which would serve to embed the ends of the hose into the tapered
collars or threads therein.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a pipe-coupling, the combination with a soft metal pipe, of a collar
provided internally with a comparatively thin spiral rib, adapted to swage a
thread on the pipe, substantially as shown and for the purpose set forth.
2. A collar for coupling on to a soft metal pipe, said collar having internally
a spiral rib or thread and a plane surface between said rib or thread, substantially
as shown and for the purpose set forth.
3. A collar for coupling to a soft metal pipe, said co lar having internally
a spiral rib or thread and a plane surface between the rib or thread, the outer
surface of the collar being provided with plane surfaces, substantially as shown
and for the purpose set forth.
4. A collar for coupling to a soft metal pipe, said collar having an internal
spiral rib or thread with a plane surface between the same, the collar being
slightly tapered internally from one end to. the other and the outer surface pro-
vided with flat surfaces as herein shown and described and for the purpose
set forth.
Dated 1941 "
1000
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.