USRE9649E - Fbedebick n - Google Patents

Description

F N DU BOIS Machine for Ma,nufacturing Lead Tra ,ps..

No. 9,649. Reissued Apr il 12; I881.

UNITED STATES PATENT OFFICE.

FREDERICK N. DU BOIS, OF NEW YORK, N. Y.

SPECIFICATION forming of Reissued Letters Patent No.,9,649, dated April 12, 1881.

Original No. 167,076, dated August 24, 1875. Application for reissue filed April 6, 1880.

To all whom it may concern:

Be it known that I, FREDK. N. DU BDIS, of the city, county, and State of New York, have invented'a new and useful Improvement on a Process and Machine for Making Plumbers Lead Traps and I do hereby declare that the following is afull,-clear, and exact description of the construction and operation of. the same, reference being bad to the annexed drawings, making a part of this specification.

The nature of my improvement consists in making lead traps in their finished state substantially in the same general manner that lead pipe is made, by means of very strong cyl-' inders for holding .the lead and powerful hydraulic pressure for forcing it out through an orifice havi-ngthe' shape of the pipe required, but with this essential difler'ence, that in making ordinary lead pipe the lead is supplied in equal amount to all parts of the orifice at the same time, and the pipe comes out straight',-

while, to make lead traps by this improvement, the lead is furnished in greater quantity, first on one side of the orifice and then on the other, as it may be desired to make the pipe or trap bend either way;

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation in detail.

Figure 1 is an end elevation of what may be called the cylinder, and which is to be a thick casting of steel of great strength. Fig. 2 is a sectional longitudinal elevation of the same. Fig. 3 is a cross-section. elevation. Fig. 5 is a sectional elevation of a trap in its finished state.

The same letters refer to corresponding parts in the different figures.

The method of operating the machine is as follows: The steel cylinder Fig. 2, of which there must be one for each size of trap to be made, is. held in a fixed horizontal position, as represented in the drawings, by suitable fastenin'gs. It is then heated by any convenient means to about 400. The ends A and A are now filled with melted lead, which is allowed to cool until the heat is a little below the melting-point, when a plunger or ram (not necessarily shown in the drawings) attached to a hydraulic water-cylinder is brought against the lead in each end. The force exerted by one, which will be from twenty thousand to Fig. 4 is an thirty thousand pounds per square inch on the surface of the lead, is counterbalanced by the other, and drives the lead into and fills the two upward passages to the circular orifice e and e, Figs. 2 and 3. These two streams of hot and soft, but not melted, lead are kept separate from each other until they arrive near the orifice by the steel. core B, Figs. 2 and 3; which has a nut on the bottom to prevent its being forced upward, and a projection around the top, which forms the inside of the .orifice; also by the partition P, (shown by the dotted lines in Fig. 2, and the top of which is shown at 'e and e, Fig.'3.) These two parforce forward the lead, are'under easy control 'of the person operating the machine.

The operation of forming a trap such as is represented at Fig. 5 is to move forward the two streams'of lead with equal speed, and supplying an equal amountof lead to all parts of the'orifice, when the lead will be forced out through it, forming a round smooth pipe that will be straight, the soft, hot, and clean leadof the two streams having united inseparably in the space between the top of the partition and the orifice under a pressure varying with difierent degrees of heat from fourteen thousand to eighteen thousand pounds per square inch. The part of the trap now formed is represented from a to b in Fig. 5, and by the dothaving furnished lead for half of the circumference of the pipe. The speed of the righthand stream A is now reduced and the speed of the left-hand stream increased,lthe eifect of which is that the sidehof the orifice ate is tedlines at the top of Fig. 2, each stream supplied with only enough lead to form the short side of a-curved pipe, while the other side of the orifice, at e, is supplied with enough lead inform the long side o'fgthe curved pipe and a little more than half'lof the circumference, the lines of union between the two streams of lead moving toward the side that supplies the least leadJ Hence the pipe is formed bya natural and easy distribution of the metal, and is free from waves or imperfections. The curve being thus formed from b to v c, the order of'speed of the two streams of lead is now reversed, when the same eifect" takes place in the opposite direction, forming the pipe or trap from c to-d, after which the speed of bothstreams is again made equal, when a straight part is formed, as at first, and which is sawed ofl at the orifice, a finished lead trap without a seam and of equal thickness in all its parts.

The operation above described is repeated until the leadin the cylinder is exhausted,

- when the rams are withdrawn and more lead introduced, as at first.

In Ounninghamspatent, No. 139,946, issued June 17, A. D. 1873, there is shown a device to be attached to the reservoir holding the hot'lead or composition ,to be forced through the die by any suitable power. The core in that case is represented as supported within the external shell by wings, which willdivide the stream of lead as it enters what he calls the die, and below the movable diaphragm, which is intended, as set forth in his specification, to increase or diminish the quantity of lead or composition passing through the die on either side alternately, and so cause, as he asserts, the emerging trap to assume any desired curve. My invention is distinguished from that set forth in said Letters Patent in this, that the partitions P extend along the core, forming, with the shell, the twoupward passages, and (as set fprth herein) complete the separation of the two streams of lead until it is desired to unite them 'just below the orifice. 'This is done by the unionof the passages in a short annular chamber at the base of the swell on the outer end of the core,

whereas in' said Cunninghams machine, as

set forth in his patent, the lead flows along the entire length of the cylindrical core in an annular chamber in a single stream. The action in his machine is on astream formed asa pipe between the shell and the core, and entirely surrounding the core, while in my machine the streams, moving at different velocities, are not united until they meet in the annular chamber, just before passing out at-the orifice of discharge.-

What I claim as my inventionis- 1. As an improvement in the art of making lead traps for plumbers use,.the ejectment of two or more convergent streams ofmetal moving with unequal velocities through an annular orifice or die, substantially as herein shown and described.

2. The improved apparatus herein shown and described, combining in its construction independent cylinders A A, a core, B, partitions P,and' an annular discharge orifice, e c,

for forming traps by the union of independent,

ly-actuated streams of lead, substantially as set forth.

3. In a machine for makinglead traps by controlling the efflux of the metal on opposite sides of a contra-L core, in combination with the core and external shell which form ,the

annular orifice, through which the metal is dis-. charged in the form of a pipe, two passages.

be-united in an annular space just below'the orifice of discharge, substantially as set forth. In testimony whereof I have hereunto set my hand in presence'of two subscribing witnesses.

FREDERICK N. DU BOIS.

Images