US2182403A - Melting pot - Google Patents

Description

. 5, 1939. N. LE TER- 21 2403 MELTING Po'r Filed April 7, 1937 INVENTQR.

BY 710172471 i625 er 5%. Ma 9 ATTORNEY?- Patented Dec. 1 939 UNITED STATES may;

PATENT oFFicsf 1 Claim. (01. 22-70) The present invention-relates to a new and improved construction for a melting pot best adapted to be used in pressure casting machines.

The general object andnatur'e or my invention is to provide a construction wherein those parts of the melting pot which are subjected to the greatest stress and severest usage are removable and replaceable so that the entire melting potneed not be discarded in the event that one or more of the parts subjected to the severest con-' ditions of usage should fail.

Briefly outlined, my invention comprises a metal pressure casting cylinder and a pressure delivery conduit or gooseneck, both of which are made separable from the melting pot propeiy'but are in normal operation adapted to be mounted in the interior of such melting pot. In addition to the advantages heretofore outlined, the construction embodying the principle of my invention possesses the further advantage in that the walls of the melting pot are of uniform thickness throughout their horizontal cross sections thereby insuring uniform transmission of heat to the metal within the pot and eliminating the presence of any possible cold spots in the walls oi the melting pot due to irregularities and thickness.

My invention also provides means for transmitting force directed against the discharge end of the separable gooseneck to the rim of the scrlption set forth in detail certain structure em-- bodying the invention, such disclosed'means con stituting, however, but one or various structural forms in which the principle of the invention may be used.

In said annexed. drawing:

Fig. l is a top plan View of a. melting not contion; Fig. 2 is a vertical cross section taken substantially along line 22 of Fig. l; and Fig. 3 is a vertical cross section taken substantially along line 3-3 of Fig. l.

Now referring more particularly to the drawing, there is shown therein a melting poti having a rim flange 2. A pressure conduit or gooseneci; 3 having a central passage 3 has a discharge end 5 adjacent the rim of the melting pot i and an 5: enlarged annular reed emit adapted to rest on melting pot instead of against the bottom of thestructed according to the principle of my inventhe bottom of the melting pot l and to support the pressure cylinder 1. A plunger 8 is adapted to reciprocate in the central bore IQ of the cylinder 1. Inlet passages 9 lead from the melting pot I into the central bore Ill of the cylinder I. 5

The central bore i0 is enlarged as indicated at H and decreased as indicated at H to a diameter equal to that of the passage 4 in the gooseneclr 3. The meeting faces of the annular end 8 of the gooseneck 3 and of the cylinder 1, as indicated at 10 H, are finished, close fitting surfaces; and a pro jecting boss M, with tapered sides on the cylinder 1, extends into a correspondingly shaped recess in the top of the gooseneck feed end 6. The latter in turn has an annular bearing surface on 15 its bottom and a central projecting boss l5 fitting in the bottom of the melting pot i. Thus the projections Hi and it serve as means not only for properly aligning and locating the gooseneck portion d and the cylinder 5, but also the projection 20 M, together with the finished meeting surfaces it, serves as means for sealing the interior of the cylinder i and the gooseneck 3 to prevent leakage of molten metal when subjected to pressure.

Projections or lugs i'l extend from the bottom as of the melting pot i to a point near its top and are adapted to be threadably engaged by the studs it which in turn hold the clamping members is in place. As will best be seen from Fig. 3, the clamping members 19 bear against the rim 2 or so the melting pot i and against the top-of the cylinder "i and thereby clamp the goosenech 3 and cylinder 7 in positionin the interior of the melting pot.

The rim 2 of the melting pot has a recem 2d for the reception of the discharge end d of the gooseneck 3. A groove at is provided inthe recess it and is for the purpose of receiving a packing or sealing material such as fire clay so that the upper end of the gooseneck 3 can be sealed so as to pre- 4g vent leakage of liquid metal through therecess 26. A lug 22 an the discharge end 5 of the gooseneck 3 carries thethreaded studs 83 which in turn are adapted to abut against the l 2 9 up= standing on the rim 2. Since the melting pot is 45 carried by a supporting frame and the discharge end 5 of the gooseneck 3 is connected to a mold, such as indicated in the apparatus shown in my copending application Serial No. 66,551, filed Mar. I 2, 1936, some force will be exerted against such an discharge end o. Hence the abutment means comprising the lugs 22, 24 and the studs 23, pre vent such force or pressure from being transmitted through the intermediate portion of the gcosenec'r; a to the bottom of the melting pot i. as

The studs 23 of course provide means for adjust]- ably regulating the abutment point of the end of the gooseneck 3 with respect to the meltingpot the liquid level of the metal in the melting pot can normally extend as high as possible in the interior 4 of the gooseneck 3, thus eliminating as much air as possible therefrom. As will be seen from Fig. 2, the liquid level of the metal in the melting pot I is maintained substantially at the line L, L. Leakage of metal out through the opening 20 is of course prevented by the fire clay packing materialin the groove 2|. 1

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the structure herein disclosed, provided the means stated by the following claim or the equivalent of such stated means be employed.

I therefore particularly point out and distinct- 1y claim as my invention:

In a melting pot the combination of a vertical pressure cylinder and a pressure delivery conduit, bothseparable from each other and from said melting pot, said conduit being entirely supported at its feedend by the bottom of said melting pot and having its discharge end directly supported by the rim of said melting pot, said cylinder being entirely supported and superimposed upon said feed end of said conduit, interfitting projections and recesses on said cylinder, on said feed end of said conduit and on said melting pot respectively, for locating and aligning them in assembled position, said-recesses and projections being in alignment with each other and located centrally of said cylinder, of said feed end of said conduit, and of the bottom of said melting pot, and means for clamping said cylinder and said conduit to said melting pot in such position, the

entire cross sectional area of said cylinder and said feed end of said conduit being substantially the same.

NATHAN LE TER.

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