US1672728A - Metal pot - Google Patents

Description

A. N. OTIS METAL POT Filed Oct. 12 1925 p fi wo Wm, W m A Tmm. A H

Patented; June 5, 1.928.

' umrrao STATES ALBERT it. one, or

' METAL row.

1 fiftaizazs PATENT-- OFFICE.

scnnuno'ranr, mzw Yo'nx, ASSIGNOB T emu. lax-norms Germany, a oom'omrrou or new 2033..

Application filed 0mm- 12,1925. Serial Io. 51,895.

My invention relates to pots for containing molten 'metals, and has for its object the provision of means whereby the metal may be conveniently'poured ofi so as to leave-in the pot the dross and other impurities floating on the surface.

showing a modification of my invention.

a My invention has particularapplication to lead melting pots although it obviouslyhasapplication to pots for melting or containing various other metals or alloys of metals. In carrying out my invention in one form I connect the pouring spout with the bottom of-the pot and force the molten metal out through the spout by applying a fluid pressure to the surface of the molten metal.

For a more complete understanding of my invention reference should be had to the accompanying drawing in which Fig. 1 is a sectional view of a lead melting pot embodying myyinvention; Fig. 2 is a plan view of the device shown in Fig. 1 with the cover removed; while Fig. 3 is a sectional view Referring to the drawing, I have shown my invention in one form as applied to a lead melting pot -of substantial capacity such as may be used, for example, in supplying molten leadto machines for applying a lead sheath'to cables. The metal melting pot comprises a receptacle 10 which may be of any suitable shape and is shown as being substantially cylindrical with itsaxis vertical. A pouring spout 11 is provided near the top of the receptacle. This spout is connected through a duct 12 with the bottom of the receptacle. Theduct 12 extends vertically. along the side of the receptacle adjacent the spout 11, its upper end being open -for convenience in cleaning, and, its

lower end communicating through an inlet,

orifice 13- with a depression or groove 13 forming the lowest point of the receptacle.

- As shown thereceptacle is provided with a concave or substantially semispherical 'bottom, the depression l3 being formed by ex tending the bottom wallvoutward laterally at a point just below the duct .12.

The receptacle is. provided with a substantiallyvertical partition wall 14 which divides it into two chambers 15 and 16 communicating with each other at the bottom of the receptacle through an opening 17. The chamber 16 is shown somewhat smaller thanthe chamber 15 although it may be of any suits -able size, and it is provided with a ti ht cover 18, shown as a plate which is secure in place b clamping screws 19. A pipe .20 extends t roughthe cover 18 through which a suitable fluid, preferably a gas, such as air, Y

may be admitted under pressure into the chamber 16 when it is desired to pour molten metal from thespout 11. When the air under pressure is admitted through the pipe 20 the molten metal in the chamber. 16 is forced out through the opening 17' into the chamber 15; Consequentl the molten metal in the chamber 15, and ikewise in the duct 12, rises and consequently the-metal when poure is w free from dross'and other impurities floating on the top. It will also be observed that. with this arrangement it is unnecessary to tilt the pot in order to pour. This is a decided advantage particularly where large quantities of metal are being handled. When all or a substanti' lpart of the metal in the chamber 16 has been forced 0ut,'the

pipe 20 may be connected to the outside air.

This relieves the pressure in the chamber 16' and the molten metal in the chamber 15 accordingly flows into the chamber 16 until the metal in the two chambers assumes the same heador leveL After the pot has been recharged, additional metal maybe poured.

In the particular arrangement shown electric heating means is associated with the receptacle' 10 so that the metal ma be melted in the receptacle, although it wi. understood thatmy invention may be used mdependently of the heating means. In fact no heating means may be used in certain applications, for example, in case the pot/1s used as a mixing device, such as in the making of alloys.

As shown the receptacle 10 is provided 3 I with a flange 21 near the top which rests upon a supporting wall made of heat re fractory bricks 22 surrounding the Est. A

heat refractory brick' bottom 23'is' a vided. The entire device is provided with a metal casing 24, suitable powderedv heat. re fracto'ry insulating material 25 being provided between the side wall of the casing and the bricks 22. Suitableheating resistors26 -are provided in the interior ofthe chamber,

pro-q these resistors being hung upon metallic pins the' cover through whic I charged, a chute 33 being providedfor this i 26 which are secured in the bricks 22. The heating resistors encircle the receptacle 10 in close proximity thereto. The terminals of theresistors are brought out to suitable connectors 28.

The metallic casing 24 extends upwardabove the flange 21 somewhat, and the annular space thereby provided is filled with loose sand 30 which forms an airtight seal for a cover 31, the lower edge of which sets" in the sand. 'An openingl 32 is provided in the pot may he purpose. v

In the modified form shown in Fig. 3 the chamber 35 to which compressed air is admitted through a pipe 36 is placed next to the pouring duct 37. The chamber 38 is connected to the chamber 35 ator near the bottom of the pot through an opening 39' which is provided with a one way valve 40. This valve is arranged to ermit the molten metal to flow from the c amber 38 into the chamber 35 until the metal has the same level in both chambers, it being assumed that the chamber 35 is open so that atmospheric pressure exists 1n that chamber.

- 5 much denser lead.

When the air pressure in the chamber 35 is increased by admitting air through the pipe 36 the valve 40 closes thus preventing the return flow of molten metal into the chamber 38 and the molten metal is, therefore, forced out through the duct 37. As shown the valve 40 is ivoted below the opening 39, which is pre ierable for a lead melting pot since the valve made of iron will float in the In this modified formoi my invention the wall 41 between the chambers 35 and 38 is shown as inclined so that the walls of the chamber 35 are divergent and the cross sectional area of the chamber. 35 gradually increases toward the bottom of the pot; This provides for a gradually increased pouring rate the chamber 35 is emptied. Obviously, the 'wall 14 of the form shown in Fig. 1 could likewise be inclined to provide fora gradual increasing crosssectional area of the chamber 16 toward the bottom of the pot.

While I havedescribed my invention as i embodied in concrete form and as operating in a specific-manner in accordance with the provisions of the patent statutes, it should be understood that I do not limit my invention j thereto since various modifications thereof will suggest themselves to those skilled in theart without departing from the spirit of my invention, the scope of which is set forth inthe annexed claims- W'hat I claim as new and desire to mcure my hand this 10th da by Letters Patent of the United States is 1. A molten metal pot comprising a receptacle, a partition in said receptacle di-.

vidingsaid receptacle into a plurality of chambers communicating with each other,

said receptacle being provided with an outlet duct extending downward into one of ,said chambers, and means for forcin the molten metal out of the other of said 0 amber's, into the first wherebysaid metal is caused to flow out through said duct.

2. A molten 'pot ,co'm'prising a receptacle, a. partition in said receptacle dividing said receptacle into a plurality of chambers communicating at their bottoms, an outlet spout near the to of one of said chambers,'-said said chambers being closed, and means for admitting a compressed gas into said closed chamber whereby'the molten metal therein ng said receptacle into a plurality of is forced into said first chamber and thereby caused to flow out through said duct.

4; A lead melting pot comprising a receptacle, a partition in said receptacle dividing said receptacle into a plurality of chambers communicating at their bottoms, a spout I opening into one of said chambers near the top thereof, said chamber being provided 1 with a duct connecting said spout with the bottom of said chamber, a tight cover for the other of said chambers, means for admitting a compressed gas into "said @second chamber whereby the molten metal therein is forced intosaid first chamber-and thereby'caused to flow out through said duct.

5. A molten metal potcom rising a re-' ceptacle provided with an out et duct communicating with said receptacle at the bottomthereof, said duct hav mg in near the top of said receptacle, and me ins for forcing the molten; metal in said receptacle out from the bottom of said receptacle through said duct, said receptacle having walls divergent toward the bottom to gradually increase the pouring rate as there ceptaclesis'emptied.

In witness whereof, I have hereunto set or October, 1925.

EBT N. OTIS." -c

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