US1843491A - Pneumatic metal pump - Google Patents

Description

* Feb. 2, 1932. TORNBERG 1,843,491

PNEUMATI C METAL PUMP Driginal Filed April 2 O 1925 2 Sheets-Sheet l Feb. 2, 1932.V l. TORNBERG i 1,843,491

PNEUMATIC METAL PUMP Original Filed April 20, 192e 2 Sheets-Sheet 2 Patented Feb. 2, 1932 UNITED STATES PATENT OFFICE ISIDOR TORNBERG, OF PLAINFIELD, NEW JERSEY, ASSIGNOR TO WOOD NEWSPAPER MACHINERY CORPORATION, OF NEW YORK, N. Y., A CORPORATION 0F VIRGINIA 'PNEUMATIG METAL PUMP Application filed April 20, 1926, Serial This invention relates to a pneumatic pump. Although capable of other uses it is designed particularly for use in stereotype casting machines for filling the molds with molten metal.

The principal objects of the invention are to provide an improved pneumatic means for insuring the delivery of the metal to the mold; to provide a pneumatic pump which can be operated in a plant in which there is no source of compressed air or in which it is not desired to use the same; to create pulsations of compressed air on the metal and under the control of the operating mechanism to maintain a constant supply for the casting operation; and to do away with the necessity for using the valves for controlling the air pressure, thus simplifying the construction and providing for great reliability.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. 1 is a plan of a part of a melting pot and mold including the air supply means;

Fig. 2 is an elevation, partly in section, of the air pump;

Fig. 3 is a sectional view of the metal pump in the melting pot; and

Figs. 4 and 5 are central sectional views showing a modication with the parts in two positions.

This constitutes an improvement over the construction shown in my pending application for patent on a pneumatic ladle pump, Serial No. 85,570, iiled February 2, 1926.

In that case the same kind of a metal pump is used as I now employ but instead of depending on the air pressure in a compressed air system and admitting it to the metal pump periodically by means of a valve, I provide for creating the air pressure by the mechanism of the casting machine and producing pulsations which act on the metal in No. 103,198. Renewed .Tune 17, 1931.

the pump to force it out in substantially the same way as in that case.

Referring to the drawings, I have shown a pump 10 located in the melting pot 11 near lone side and mostly below the level of the molten metal. Extending up from the pump 10 is a discharge tube 14 which enters a swinging spout 15. The interior of `this spout is not shown in this case, as it is fully described and claimed inmy above mentioned pending case. At any rate the construction shown therein can be used with this invention and does not constitute a part thereof.

In the bottom of the metal pump 10, is a valve 16 which is provided with a stem 19 extending downwardly and guided in a guide 18 forming a part of a removable valve seat 17 which is secured in the'bottom of the pump. This valve is free to rise and fall. It opens by the aid of the suction on top and the pressure of the metal in the pot on the outside and closes by gravity assisted by the rush of metal toward it caused by the air pressure above.

The casting box 25 is provided with .the usual rotating core which has a gear 26 on its top, operated by a pinion 27 on a rotating horizontal shaft 28. This shaft is connected by a clutch 29 to ashaft 30 driven constantly from a vertical driving shaft 24. Thus the core will be rotated when the clutch is thrown in as usual.

On the shaft 30 is a crank 31 operating a Vpiston rod 32 having a piston 33 thereon.

my above identified application. The action ot the air pump delivers an intermittent but a practically uninterrupted flow of air to the metal pump 10 and forces the metal up into the discharge spout 15, whence it flows by gravity into the mold 25. Means can be provided, as in my said case, for storing and delivering a single charge of metal to the mold when needed.

When the pressure of air is released by the raising of the piston 33, there is an opportunity for the metal in the pot 11 to flow into the pump 10 by pressure against the lower side oi the valve 16. ln this way enough metal is introduced into the pump constantly to keep its level up so that it can be used for the casting of plates.

In this way, it will be seen that the device can be used in places where there is no source of compressed air or independently of it, if there is any. The same results as secured in the above identified application are secured automatically without any valve for controlling the introduction of air into the metal pump. This constitutes a simpler construction and has the utmost reliability. lt is independent of the degree of pressure in any air supply and its operation is uniform.

In Figs. 4 and 5 I show another method of ,accomplishing the same purpose, except that means are provided for the retention of the column of metal within the discharge tube 14, so that it is necessary for each pulsation of air to raise only the amount of metal which it is desired to ej ect into the ladle. As will be clear from a study of the construction shown in Figs. 1 and 9., each pulsation of the air pump will cause the metal within the discharge tube 14 to rise and empty some of its contents into the ladle 20. At the release oi the air pressure at the end of each pulsation the metal in the discharge tube 14, which has not been ejected into the ladle, falls baclr and returns into chamber 10.

In Figs. 4 and 5, l show the addition of a ch eck valve 38 to what constitutes the bottom of the discharge tube 14. Fig. 4 shows the relative positions of the parts when the piston of the air pump rises to the top of the cylinder, thereby withdrawing whatever air happens to be trapped in the tube 37, connecting Ythe air pump with the metal pump. In this position the valve 16 is opened by the inrush of metal from the pot into the upper chamber 40, as well as by the diti'erence in specific gravity of the iron of which the valve is composed and the comparatively heavier metal constitutingthe melt. By the same action and because ,of the pressure due to the head within the discharge tube 14the valve 38 is brought up against its seat in the bottom oi a chamber 40. rlhe chamber 40 thereby iills with metal from within the melting pot. `When thel air pump descends on its downward stroke, as shown in Fig. 5, the

pressure of air created thereby enters through a tube 41 into the chamber 40. This closes the inlet valve 16 and opens the check valve 38, forcing metal within the chamber 40, past the check valve 38 and into the discharge tube 14, and ejecting some of it into the ladle. By means of this construction, it is evident that it is necessary only to raise the comparatively small amount of metal which is to be ejected at each pulsation of the air pump into the ladle 20 instead of raising the comparatively larger quantity of metal required by the construction shown in Fig. 3.

Although I have illustrated and described only two forms of the invention l am aware of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore l do not wish to be limited in these respects, but what l do claim is i 1'.. The combination with a casting mold, means for operating it, and a pneumatic pump for introducing metal into the mold, of means connected with said mold operating means for compressing air and introducing it into the pump intermittently throughout the time'of operation of said operating means, and means for disconnecting the mold from the operating means without stopping the air compressor.

2. rlhe combination with a pneumatic metal pump for introducing molten metal into a mold, of means operative continuously for compressing air and supplying the airl to the metal in the pump intermittently to force the metal therefrom continuously.

3. ln a pneumatic metal pump, the combination of a pot for molten metal, a pump casing submerged therein having a discharge tube for the metal, a valve adapted to be seated by gravity for preventing the'metal from escaping past the valve, said valve being adapted to be forced from its seat by the pressure of the metal in the pot when there is reduced air pressure on the metal in the pump casing, with. an oscillatable cylinder connected with the metal pump for delivering compressed air thereto, a piston in the cylinder, and a shaft having an eccentric pin connected with the piston for operating it, whereby when the pump oscillates the piston will reciprocate to produce pressure in the pump casing. l

4. ln a pneumatic metal pump, the combination of a pump casing submerged in a metal pot and having a valve adapted to be seated by gravity and by the rush of metal past it for preventing the metal from 4escaping past the valve, said valve being adapted to be .torced from its seat by the pressure of the metal in the pot when there is reduced air pressure on the metal in the pump casing to introduce metal into ythe pump casing, and the pump having a delivery spout, and check valve between said easing and the spout arranged to close when the air pressure is released to hold the metal in the spout until the pressure is again applied.

5. The combination with a pneumatic metal pump submerged in the metal in a melting pot and having a discharge tube open at the top for delivering metal, of a single acting air pump outside the pot and connected to deliver air under pressure intermittently to the surface of the metal in the pump to force the metal therefrom up the discharge tube and force some of it out of the open top thereof at each pulsation.

ln testimony whereof I have hereunto afiiXed my signature.

ISIDO'R TORNBERG.

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