IMPROVEMENTS IN MANDRELS FOR MANUFACTURING LEAD ARMORED ELECTRIC CABLES
Year: 1884

page_text: I RICHARD SOLOMON WARING of Pittsburg County of Allegheny, State of
Pennsylvania United States of America, Electrical Engineer do hereby declare the
nature of my Invention for "IMPROVEMENTS IN MANDRELS FOR MANUFACTURING
LEAD ARMORED ELECTRIC CABLES" and in what manner the same is, to be
performed to be particularly described and ascertained in and by the following
statement:-
My Invention relates to mandrels for manufacturing lead armored electric cables
and is illustrated in the accompanying Drawing in which.:—
Figure 1 is a side elevation of my improved mandrel.
Figure 2 is a longitudinal central section of the same.
Figure 3 is a transverse section on the line x Figure 2.
Figure 4 is a section similar to Figure 3, but with the central plug removed.
Figure 5 is a top plan view.
Figure 6 is a top plan view of the perforated plug or cylinder.
Figures 7 and 8 are sectional and side elevations of the removable nipples.
Figure 9 is a side elevation of my improved mandrel showing the outer row of
nipples inclined towards the central nipple.
Figure 10 is a longitudinal central section of Figure 9.
Figure 11 is a view similar to Figure 9, but showing a modification of the
manner of retaining the nipples.
Figure 12 is a transverse section on the line y y Figure 11.
Figure 13-is a longitudinal central section showing the nipples arranged parallel
and retained in place in the same manner as in Figure 11.
Figure 14. is a transverse section showing the manner of interlocking the flanges
of the nipples.
Figure 15 is a transverse sectional view of the perforated plug or cylinder.
Figures 16 to 19 are detail views of the nipples.
My Invention relates to that class of mandrels used in lead presses for making
lead covered cables, said mandrels being provided with passages therethrough for
the electric conductors, the passages terminating in nipples at the end of the
mandrel.
In mandrels in which the nipples are formed integral with the body, of the
mandrel I have found by experience that it is not only difficult and expensive to
make these mandrels, but that these nipples are liable to be broken off or damaged

page_text: while in use, and that in case of the breakage or damage of one of these nipples
which are formed integral with the mandrel the entire mandrel is rendered
useless.
The object of my Invention is to produce a mandrel which is not only more
easily made and less expensive, but can also be easily repaired in case of-the
destruction of one or more of the nipples, and in general terms my Invention
consists in the construction and combination of parts all as more fully, hereinafter
described and claimed.
A is a tapering mandrel of steel or other suitable metal having a screw threaded
socket a at its lower end for attachment to the core bar B of a lead press.
Above the socket a is formed another socket b which is somewhat larger in
diameter than the opening in the core bar B. From this socket b extend two,
three or more small passages c through the upper end of the mandrel A. Through
these passages c are inserted steel or other suitable metal tubes e which are
provided with flanges e' at their inner ends, and are of. length sufficient to
protrude a short distance beyond the end of the mandrel. These tubes e are held
in place by means of a plug or cylinder f provided with longitudinal perforations f¹
each showing a diameter at least equal to the diameter of the openings in the
tubes e, but should be less than the outside diameter of the flanges e¹. After the
tubes e are inserted in the passages c and their flanges e¹ have been firmly pressed
up against the top of the socket 6 the perforated plug or cylinder f is placed in the
socket with its perforations registering with the tubes e, and the edges of the
perforations bearing against the flanges el. Then the mandrel with its parts
adjusted as above stated is screwed into the core bar B, and as the diameter of
the opening in the core bar B is less than the diameter of the plug or cylinder f,
the inner peripheral edge of the core bar will bear upon the outer peripheral edge
of the plug, thereby holding the plug firmly in place and this plug in turn holds
the tubes e in place.
It is obvious that in case the ends of any of the tubes or nipples of a mandrel
constructed as above described, should become broken or damaged that said nipple
or tube can be easily replaced.
In case it is desirable to form a cable, of smaller diameter and with thinner
walls between the electric, conductors, the outer row of passages can be made so
as to incline from their inner ends towards the central passages as clearly shown
in Figures 9, 10 and 11, and the flanges el of the tubes e should in such case be
formed at an angle to the tubes as shown in Figure 16.
It is frequently desirable that there be no openings or spaces between the
flanges e of the tubes e when arranged in their places in the mandrel, in such
case I construct the flanges e¹ as shown in Figure 14, so that their meeting edges
shall abut and match forming what is practically a smooth, unbroken surface at
the end of the socket b.
:
The construction of my mandrel may be so further modified so that the tubes e
may be held in place by the end of the core bar without the interposition of the
perforated plug or cylinder f, this may be effected by making the extreme end of
the core bar solid and then forming perforations in said solid end, the perforations.
being so arranged as to register with the tubes e when the mandrel is screwed
onto the core bar. But I prefer to attain the same end i.e. omitting the perforated
plug or cylinder, in the following manner.:-
The core bar is constructed as usual, and the mandrel is provided with its usual
threaded socket a and a shorter socket or recess b having a depth only equal to
the thickness of the flanges e¹, into which socket the passages c open as in the
other construction described: The tubes e are provided with flanges e¹ as before
but, the flanges in this case are made thicker, the outer row of tubes e are held
in place by the inner periphery of the core bar and the central tube e is held in
place by the flanges of the outer row of tubes such flanges lapping over the flange
of the inner tube for that purpose as shown in Figures 11, 12, 13, and 14. In
order that the flanges of the outer row of tubes may bear upon the end of the

page_text: socket b they are cut away in one place on their inner surface as shown at e²,
Figure 17 for half their thickness, and the outer surface of the flange of the central
tube is scalloped or circularly recessed around its entire periphery for half its
thickness as shown at e³ Figure 19. The tubes having flanges as just described,
may be arranged parallel to each other as shown in Figure 13 or the outer row
may be inclined towards the central tube as shown in Figure 11.
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
First. In a mandrel for lead presses, the combination of the body A having
longitudinal openings therethrough, the removable nipples e forming the passages
for the wires, and mechanisms described for holding the nipples in place,
substantially as set forth.
Second. In a mandrel for lead presses, the combination of the body A having
longitudinal opens therethrough, the removable nipples e provided with a flange
at one end thereof, the perforated plug f and the core bar, substantially as set
forth.
Third. In a mandrel for lead presses, the combination of the body A having
openings therethrough, the removable nipples e forming passages for the wires
having interlocking flanges as described, the perforated plug fand the core bar,
substantially as set forth..
.
Fourth. In a mandrel for lead presses, the combination of the body A having a
series of openings therethrough arranged as described, the removable nipples e
having flanges at one end, the flange of the central nipple having recesses formed
in its outer side at intervals around its circumference, the flanges of the outer
nipples having a recess formed in their inner sides at one point of their cir-
cumference whereby the central nipple is supported by the outer nipples, and
mechanism as described for holding the outer nipples in place, substantially as set
forth.
Fifth. In a mandrel for lead presses, the combination of the body A having a
series of openings arranged around and inclined towards a central opening the
removable nipples e having flanges e¹ the perforated plug f and the core bar,
substantially as shown and described.
Dated this 4th day of March 1884