US967012A - Mold. - Google Patents

Description

H. GASGHE & K. WENSKSI'.

HOLD.

APPLIOATION rn.nn JAN. 27, 1910.

Patented Aug. 9, 1910.

H. GASGHE & K. WENSKY.

MOLD.

APPLIOA'IION IILED JAN. 27, 1910.

967,012. PatentedA 1910.

2 BBIEBT HEET 2.

HEINRICH GASCI-IE AND KARL WENSK, O]? FRANKIE'ORT-ON-TI-IE-MAIN', GERMANY.

Speeification of Letters Patent.

Patented Aug. 9, 1910.

Application filed January 27, 1910. Seria1 N0. 540,570.

T0 all whom z't may concem:

Be it known that we, IIEINRIOI-I GASCI-IE, residing ab Solmstrasse, und KARL VVENSKY, residing at 17 Nauheimerstrasse, Frankfortonthe-Main Germany, botl1 citizens of the German Empire, have invented a certain new und useful Improvement in Molds, of Wl1ich tl1e following is a specifieation.

Defective metall1c castings, which result from th0 entrance of slag 130 the m0ld during the casing operation are 0f daily occurrence in large foundries, the trouble being largely clue t0 an insuflicient quantity 0f metal in the ouring ladle. When a m0ld is 0nly part1ally filled und the ladle empty, the slag enters the mold, und although an additional charge of metal is poured into the mold, the result is a defect in the casting Which in m0st cases renders it worthless. It is a coinmon practice t0 provide a pouring gute with a plurality of compartments 0r cavit1es which aue connected together by a narrow channel designed 130 hold back impurities, but such devices do 11015 obviate tl1e trouble above referred t0.

This invention relates t0 improvements in pouring gutes of the clmracter above' indicated, the object being to prevent the entrance 0f slag 0r other impurities t0 the mold, and 130 accomplish this object We make use 0f the diflerence in specific gravity between molten metal und slag by providing a float Which Will be raised 0r lifted loy the metal for opening the gate, but Which Will 11013 be lifted by the slag, so that as 50011 as the metal passes from beneath the fioat the latter Will settle doWn ancl operate to hold back the slag.

T0 1nore particularly describe 0111 invention vve Will refer 130 the accompanying drawings in which Figure 1 is a vertical section through a porti0n 0f' a m0ld illustrating our invention. *ig. 2 is a lan view 0f Fig. l. Figs.3 4 und 5, respectively illustrace the fi0at in side, 011d and top views. Fig. 6 is a view similar t0 Fig. 1 shovving a slightly modified forma 0f our invention and Fig. illustrates still anothr form of' our invention.

Referring to Fig. 1 the mold there shown is provided with a gate a having the usual enlarged mouth a which is cut into the mold und made suificiently lauge 130 receive the fl0at b. A cavity a is also cut i11t0 tl1e mold for receiving the molten metal from the laclle, the bottom Wall c 0f this cavity forming the pouring surface. lthe mouth a of the p0ur1ng gute :ue cou- Said cavity a und necteclby a narrow channel d through which the metal passes t0 tl1e gute a. The float b is made of such size as will properly regt upon the bottom Wall of the mouth a. to c0ver the gate a, und as illustrated in Fig. 2 the float is so shaped as t0 extend into the channel (Z so as t0 reduce the possibility of slag entering the mouth a. As hereinbefore indicated the fl0at b has a specific gravity less than that 0f themolten metal but greater than the specific gravity 0f the slag, so that it Will be raised by the metal to enable the latter to enter the mold, but Will sink as s0on as the surface of the metal falls below the mouth of the gate, und thus operate to shut out the slag. The float may be made of sand, clay, chamotte, graphite, 0r any othe1 suitable 1i1aieri2il,- und may, if necessary, be vveighted with metal. Topermit a speedy run 0f the liquid metal when the ascension of the float is slight, the bottom surface 0f tl1e latter should be comparatively large, und f0r this reason its bottom surface is made concave, and to permit tl1e escape of gases small vertical h0les are made through the float, as clearly shown. Bars e, e, a1e secured above the float t0 limit its upward rnovement.

In Fig. 6 vve have illustrated the float Z) Which is arranged to extend across the channel 03 t0 prevent slag from flowingfrom the cavity a t0 tl1e mouth a 01'? the gate a, as Will be readily understood.

In Fig. 7 we have illustrated a form 0f 0ur invention in which ehe float may be raised mechanically and then allowed to sink down with the gradually lowering surface 0f the liquid metal. In this case the fi0at is helol down u11flil tl1e filling cavity contains a suflicient amount of the liquid 1netal, and 1'tor tl1is purpose vve provide a two-arm lever f, q, Which is pivotally supported 0n a suitable frame anal connected by a link 2' 110 a guide rod 7c, which latter is secured t0 anal forms a guide :E01' the floac b. The float is held down 0r raised by means of tl1e lever arm f, ehe downward Inovement 0f the arm being lim ited by means of a pin Z, Wl1ich in turn limits tl1e upward movement 0f the float. The lever und float may be more or less balanced by means 0f a Weigl1t as shown, so that the buoyancy 0f the fi0at may be adjusted 130 close the gate befole a certain layer 0f the molten metal which carries slag is run oft.

the slag t0 close the same, substantially 213 described.

In testimony whereof we have signed 0111 narnes t0 this specification in the presence of 15 two subscribing witnesses.

HEINRICH GAS CHE. KARL WENSKY.

VVitnesses JEAN GRUND, CARL GRUND.

Images