Improvements in the Manufacture of Leaden Traps and Curved Pipes and in Apparatus therefor.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Leaden Traps and Curved
Pipes and in Apparatus therefor.
I, WILLIAM WOODWARD ROSENFIELD, a citizen of the United States, residing
at 132 Nassau Street, New York City, in the County of New York, and State of
New York, U.S.A., Inventor, 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 :-
Heretofore such traps have been made by a somewhat difficult process of
bending a straight section of pipe; or by casting; or in a lead-pipe machine
having a peculiar arrangement for supplying the lead from opposite sides in
varying quantities, or under varying pressure, whereby the lead, as it emerges
from the die of the press, is caused to assume, by reason of the unequal pressure
of lead on opposite sides, the desired bent or sinuous form.
In my invention, the lead pipe emerging from the press is directed into a mould
around a core having the desired curve, and the pressure upon the lead causes it
to assume the desired form. In this way, I form one half of the S-trap, two of
such halves being subsequently soldered or welded together to form the complete
trap.
In the accompanying drawings.
2
Figure 1 is a horizontal section on the line 11 of Figure 2, through a machine
and apparatus for carrying out my invention;
Figure 2 is a vertical section of the same on the line 22 of Figure 1;
Figure 3 is an elevation of the mould-block;
Figure 4 is a section through the same on the line 4 4 of Figure 3 ;
Figure 5 is a similar section showing a modified construction;
Figure 6 shows two half-traps ready to be soldered or welded together,
electrically or otherwise, and
Figure 7 is a view of a complete trap.
A is the cylinder and B is the plunger of a lead-press. The cylinder is bored
from the back for the insertion of a hollow mandrel or core-bar C. In order to
support this bar against the direct pressure of the lead, it lies upon a raised bed C¹,
in the bottom of the cylinder. The lead pipe die in which the pipe is formed
around the core-bar is shown in this instance as formed by the opening D, bored
through the front wall of the cylinder. With an organization of this kind straight
lead pipe may be formed. In order, however, to give it the curve or half-circle
turn, required in the formation of S-traps. I force it into a curved mould and
around a curved core held therein. This mould may be composed of two
blocks E, E, bolted together by two through-bolts E'. Dowel-pins e, on one
block, enter corresponding sockets in the other. In each block there is formed
the longitudinal half of the mould curved to form a half-circle. Within this
curved mould, which is of circular cross-section as shown, a correspondingly curved
core F is supported in the following manner: A rod C, passing through the
hollow mandrel C, screws into the end of the core bar at c, and holds it up firmly
against the end of the mandrel. The upper end of the core is similarly supported
by a screw g, passing through the rear face of a block G, which, when the mould
is in position, is seated in a recess in the face of the lead cylinder, as clearly
shown in Figure 2. Dowels 4, on the mould-block, are similarly seated in corre-
sponding sockets in the face of the lead cylinder. A small passage-way or outlet i,
in the face of the mould-block lying against the cylinder extends from the mould
to the top of the block, and when the mould is full and formation of the lead
therein is completed, the squirt or flow of lead from this outlet indicates the fact.

page_text: A bed-plate A¹, extends from the front of the base of the lead cylinder, and is
connected at each side with the cylinder by a yoke or arch A². A removable
block or beam A lies upon the bed-plate across the opening between the two
yokes A2, and through it a screw-bolt'A'; passes. Between the end of the bolt
and the mould block a plate?A is interposed.
By this construction, which is merely illustrated. as one way of practising my
invention, I am enabled to accomplish the following operation. The mould-block
being held up against the lead cylinder, as shown in Figures 1 and 2, the lead-pipe
issuing therefrom enters the mould F, around the core F', and is by the pressure
compelled to assume the shape of the mould. The squirt or ribbon of lead that
will then emerge from the opening i, indicates the completion of this operation.
The bolt A, is then retracted, and the plate A³, removed. The press being
again started, the mould-block is, by the pressure of lead, forced away from the
cylinder, and a straight section of pipe of the desired length formed. This is
then cut off, the rod C2 withdrawn from the core F¹, and mould-block removed,
opened, and the curved half-trap X taken out.
In order to facilitate the extraction of the core F¹ from the curved lead pipe,
it is made in sections, as indicated at f, one section having a dowel seated in a
corresponding socket in the other section. As shown at f¹, the upper end of the
mould is formed with an annular enlargement to produce the flange x, on the end
of the half-trap. It is sometimes desirable that the wall forming the bottom of
the trap proper, or that part which holds the fluid seal, should be thicker than
the other parts of the trap. To accomplish this, I may form the mould F, deeper
at the point marked 2, in Figure 4. The pressure upon the lead being sufficient to
cause it to flow and fill every part of the mould, the thicker part of the pipe occupying
the part 2, of the mould, will be perfectly solid and homogeneous. In Figure 6
I have shown two half-traps X, formed in the manner above described. They
may be welded together at their flanged ends .c, the completed trap being illustrated
in Figure 7.
E
Sometimes it is desired to form a hub or lateral extension on the outer curved
wall of one or both half-traps, as shown in Figure 7. One of these hubs Y,
serves for the reception of a removable plug; to permit the removal of sediment
from the trap, and the other, Y', serves for the attachment of a valve or ventilating
pipe. This may be done in the mould by forming the block E, with the laterally-
extending mould E2, (Figure 5), the core of which is formed by a sleeve E³,
extending through the mould-blocks and bearing upon the core F¹, the sleeve
being held rigidly by a bolt E, passing through a block E, (lying against the
front of the mould-block), through the sleeve, and screwing into the core F'.
corre-
So far as I am aware 1 am the first to suggest the method of operation consisting
in forming hollow curved pipes or traps by forcing a tube of lead or like metal
"capable of being flowed under pressure into a curved mould around a
sponding curved core, and the advantage attending the manufacture of traps: in
this manner is that the metal is perfectly solid and homogeneous and flaws or
imperfections, such as are liable to occur in castings are avoided, and I am,
the same time, able to produce the traps readily and economically.
at
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 :
1. The hereinbefore described method of manufacturing curved metal pipes and
traps, which consists in first forming a tube of the material, and then forcing
such tube, under pressure, into a curved mould around a correspondingly curved
core.
2. The combination of a press adapted to: form pipe from lead or like metal,
of a curved mould having a curved core into which mould the pipe is forced by
the press, and means for holding the mould in position during this operation, and
-releasing it, substantially as set forth.

page_text: 3. The combination of the mould-blocks having the mould F formed therein,
the curved core arranged in said mould, the lead cylinder and plunger, the hollow
mandrel around which the lead pipe is formed, a rod extending through the hollow
mandrel and supporting one end of the core F', and means for supporting the
opposite end of the core, substantially as set forth.
4. The combination with the mould-blocks having the mould formed therein and
made deeper at f², of the curved core arranged in the mould, the lead press, and
means for holding the mould in position, whereby the lead pipe, as it emerges
from the press, is forced into the curved mould around the curved core, sub-
stantially as set forth.
5. The combination of the mould-blocks, the curved mould formed therein, the
sectional curved core, the lead cylinder, the hollow mandrel, a rod C³, supporting
one end of the core, the block G, a bolt g), supporting the opposite end of the
core, and means for holding the mould in position to receive the lead pipe
issuing from the press substantially as set forth.
Signed, at the City of New York, N.Y., this 4th day of May 1891.
Witnesses:
WYRE H. FRANK.
EDWARD C. DAVIDSON.
WILLIAM WOODWARD ROSENFIELD.