US1749723A - Ingot stripper - Google Patents

Description

5 Sheets-Sheet 1 INVENTOR MarCh 4, 1930- R. H. STEVENS INGoT sTRI'PPER Filed Aug. 25, 1928 www@ Rie/aard l @nv/wm.

R. H. STEVENS INGOT STRIPPER March 4, l 930.

Filed Aug. 23, 1928' 5 Sheets-Sheet 2 Iza/ard Af. Stevens'.

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March 4, 1930. R H STEVENS 1,749,723

ING-0T STRIPPER mhafdszyem.

March 4, i930. R. H. STEVENS INGOT STRIPPER Filed AHL 25, 1928 5 Sheets-Sheet 4 INVENTOR March 4, 1930. R, H, STEVENS 1,749,723

INGOT STRIPPER Filed Aug. 23, 1928 5 Sheets-Sheet 5 5K i il i INVENTOR kar-l E 1576061219.

Patented Mar. 4, 1930 UNITED STATES PATENT oFFIcE RICHARD E. STEVENS, F WESTMONT BOROUGH, PENNSYLVANIA, ASSIGNOR TO IBETHLEHEM STEEL COMPANY INGOT STBIPPER Application filed August 23, 1928. Serial No. 301,471.

My invention relates to apparatus for stripping ingots from molds and is more particularlyY designed for use in stripping big end up ingots having sinkhead top portions.

It is customary when casting ingots, with the big end up, to place a refractoryl top or sinkhead mold, of suitable material to form an extension for the mold proper, as by this arrangement ingots more free from piping and segregation are formed, the result being that the metal in the upper or larger end of the ingot and the sinkhead remains fluid for a longer time than the smaller lower end, thus allowing the shrinkage cavity to localize itself in the sinkhead top portion of the ingot. After the ingot becomes suilieiently cooled the refractory to is preferably removed so that this part o the ingot projects out of 2o the mold at the top.

It is the object of my invention to provide a. device for gripping the projecting portion of the ingot and means for exerting a pressure on the mold and an oppositely directed pressure on the ingot so as to overcome its resistance to separation from the mold.

Another object of my invention is to provide a sim le device for stripping a bi end up ingot om its mold, which is easi y at 3o tached, with slight changes, to a crane adapted to strip big end down ingots.

Having thus given a general description of my invention, I will now, in order to make the same more clear, refer to the accompanying five sheets of drawings, which form part of this specification and in which like characters of reference indicate like parts.

Fig. 1 illustrates diagrammatically the general arrangement of a stripping crane with my improved tongs attached thereto in the position they will assume when they are about to grip the sinkhead top portion of the ingot;

Fig. 2 is a side elevation of my invention `drawn on a larger scale showing the tongs suspended over the mold of a large top ingot having a projecting sinkhead top, and 1n position to begin to grip the sinkhead portion of the ingot, the cradle being shown in its lowered position;

Fig. 3 is a side elevation but showing the tongs after the sinkhead portion of the ingot has been gripped and the main and auxiliary levers have been moved to extreme travel by means of raising the ram and cradle while the ingot has been raised slightly to begin the stripping operation;

Fig. 4 is an end elevation of the tongs and lower end of the ram illustrated in Figs. 1 t0 3, but drawn on a slightly larger scale;

Fi 5 is an end elevation similar to Fig. 4 but sowing a modified form of tongs, with parts broken away to more clearly illustrate the manner of construction;

Fig. 6 is a side elevation of the tongs detached as used with the construction shown in Fig. 5

Fig. 7 is a side elevation of the crosshead 111sed4with the construction shown in Figs.

Fi 8 is a view similar to Fig. l, but showing t e ingot stripped and raised clear of the mold;

Fig. 9 is a vertical sectional elevation through the cradle and the lower portion of the ram, illustrating the usual manner of stripping ingots larger at the bottom than at the top; and

Fig. 10 is an end elevation of the parts shown in Fig. 9.

Referring now to the characters of reference on the drawings and first to Figs. 1, 2,

3, 4, 7 and 8, the numeral 1 indicates the ingot mold seated on a stool 2 with the largeend up, having lifting lugs 3 near the top and bottom edges for lifting the same when re quired. The ingot 4 is cast in the mold with a projecting sinkhead top portion 5, which is accomplished by mountin a refractory eX- tension on top of the mold in any approved manner as indicated in dotted lines in Fig. 2 by the numeral 6. After the ingot has been cast and suiliciently cooled the refractory to is removed thereby allowing. my improve stripping tongs to engage and strip the ingot from the mold.

The stripping tongs consist of two pairs of main levers of the bell- crank type 7, 8, 9 and 10. Each pair being connected together intermediately at opposite sides by means of similar to Fig. 2,

l bolts 11 and 12 forming fulcrum points for the main levers. These bolts extend through eyes 13 in a crosshead 14 thereby maintaining the pairs of levers in spaced relation to each other and are adapted to take the loads directly resulting from the gripping action of the' tongs. `The upper ends of the bellcrank lmain levers have a longer leverage than the lower ends. The levers 7 and 8 being connected together at their upper outer ends by means of a bolt 15, having links 161 and 17 attached thereto and secured by means of a pin 18 to the cradle 19.

The links 16 and 17 being spaced apart on the bolt 15 andpin 18 by sleeves 20. The longer ends of the main levers 9 and 10 are also connected together in a similar manner l by means of a bolt 21 and attached to the cradle 19, as at 22 byglinks 23 and 24 spaced apart bysleeves 25. etween the lower shorter ends ofthe main levers 7, 8, 9 and 10 are fulcrumed as at 26 and 26 auxiliary levers 27 and 28 to which are attached or integrally formed, bits 29 for gripping the sinkhead top portion of the ingot. The auxiliary levers 27 and 28 have their outer ends each connected as at 30 to a pair of links 31 and 32, having their-upper ends pivoted as at'33 and 34 to the base casting on the lower end of the ram 35, which also carries the plunger 36 adapted to slide in an opening 37 in the crosshead 14 and forming a guide for the same.

The cradle 19 carries a plurality of sheaves 38 around which wire cables 39 are reeved and extend to sheaves 40 mounted near the upper end .of the ram 35, the ends of which extend to the winding drums 41 and 42 011l the trolley'43, indicated diagrammatically in Figs. 1 and 8 which is mounted on the traveling crane bridge -44 and enables the tongs to be moved laterally and longitudinally.

The ram 35, has a vertical rack-bar 45 attached to its upper end, meshing with a pinion 46 connected with suitable gearing and drivingmechanism, on the trolley 43 by means of which it islraised or lowered to the required height, while the Cradle 19 is adapted to slide vertically, in ways 47 on the ram and is raised or lowered by the winding drums 41 and 42 which are connected together by gearing to allow them to rotate at the same .rate of speed.

The operation of my device is as follows 1- Assuming that the parts are in the posit-ion illustrated in Figs. 1 and 2 of the drawings with the tongs suspended from the trolley 43 on the traveling crane bridge 44 the weight of the tongs being carried by the links 16, 17, 22, 23, 31 and 32 will assume a position such that the auxiliary levers 27 and 28 will bear on the main lever bolts l1 and 12 forming fulorum points therefor. By raising the -cradle 19 the bits 29 will come together to grip the sinkhead top position 5 of the ingot and as the load increases on the links. the

tionary and the cradle 19 continues torise,

carrying with it the main tong levers 7, 8, 9 and 10, raising both the ingot and the mold.

The auxiliary levers 27 and 28 having their outer ends connected by links to the ram are thus rotated on their fulcrums 26 and 26. As the auxiliary levers rotate, the lower arcshaped ends 48 of the main levers 7, 8, 9 and 10 are forced downwardly on the top of the ingot mold, while the bits 29 as they sink into the ingot, are forced upwardly, thus producing two opposing forces, one operating against the mold as a fulcrum and the other pullin the ingot upward and having the effect ol forcing the ingot out of the mold thereby assuming the position indicated in Fig. 3 of the drawings.

In the stripping operation both the ingot and the mold will be lifted, but the ingot due to the leverage will be raised at a greater rate of speed than the mold thereby separating the ingot from the mold. y f

As the auxiliary levers 27 and 28 are rocked the gripping forces are increased thereby stripping the ingot from the mold as indicated in Fig. 8. 'lhe ingot can then be transferred directly to the soaking pit furnace or elsewhere as desired. To release the ingot the ram 35 is lowered until the lower end of the ingot engages the floor of the soaking pit furnace or other support,'the cradle is then lowered allowing the tongs to move further apart and assume a' position similar to that shown in Figs. 1 and 2.

In' Figs. 5 and y6 I have shown the tongs A constructed in a` slightly different manner although the operation -is substantially the same. In this construction I dispensewith' the crosshead 14 and plunger 36 and space the main side levers 7, 8, 9 and 10 apart by means of thimbles 49 through which the bolts 11 and 12 for the main side levers pass, the outer ends of the bolts extending through cheek- plates 50 and 51 and instead of using a pair of links for connecting the outer ends of the auxiliary levers 27 and 28 I use a single link as at 52 and 53 each having a bifurcated upper end 54 attached to the ram, the lower end of each link being connected to the outer bifurcated ends 55 of the auxiliary levers. Otherwise the construction is similar to the first pair of tongs described in detail and the same reference numerals will apply thereto.

As above stated my tongs are adapted to be appliedto the usual standard stripping cranes now in use for stripping large end down ingots as indicated in Figs. 9 and 10, the only alteration necessary is to remove the gripping` links 56 and substitute my tongs in place thereof by attaching the upper ends of which stick in the mold.

My invention may be easily operated to engage different sized ingot tops as by simply raising the cradle the bits will come nearer together to grip the'ingot or by lowering the cradle the b1ts will move farther apart.

Although I have shown and described my invention 1n considerable detail, I do not wish to be limited to the exact and specific detailsy thereof, as shown and described, but may use such modifications" in, substitutions for, or equivalents thereof as are embraced within the scope of my inventionor as pointed out in the claims.

Having thus described my invention, what I claim and desire to secure by Letters Patl. An ingot stripping mechanism, comprising two pairs of main levers each pair connected together to form a fulcrum in lixed spaced re ation to each other at an intermediate point, ingot gripping means pivoted between each pair of main levers, means for operating the main levers and the gripping mechanism, and means adapted to exert a downward pressureon the top of the mold and an upward force on the ingot.

2. An ingot stripping apparatus, the combination of two pairs of main levers having pivotal points inxed spaced relation to each other, plvoted ingot gripping means attached to the main levers, hoisting means for operating the ingot gripping means and adapted to initially raise both the ingot and mold simultaneously and' to exert a downward pressure on the mold and an upward force on the ingot, and means lfor initially raising the ingot ata greater Arate of speed than the mold.

3. An ingot stripping apparatus, comprising. oppositely opposed main levers connected together to form a fulcrum at an intermediate point, ingot gripping means pivoted to the main levers, hoisting means connected to the main levers and the ingot gripping means, and means adapted to exert a downward pressure on the mold and an upward force on the ingot.

4. In an ingot stripping apparatus comprising two pairs of oppositely opposed main levers, each pair connected together to form a fulcrum at an intermediate point, ingot gripping means pivoted to the main levers,

' operating mechanism secured to the main levers and the ingot gripping means adapted to exert a downward pressure on the top of the mold and an upward force on the ingot,

and means for initially raising the ingot at a greater rate of speed than the mold.

5. In an ingot stripping apparatus comprising two pairs of oppositely opposed mainl levers, each pair connected together to form a fulcrum at an intermediate point in fixed spaced relation to each other, ingot gripping means ivoted to the main levers below their pivoted) point, hoisting means vhaving separate connections adapted to operate the main levers and gripping means together, and means adapted to exert a downward pressure on the top of the mold and an upward force on the ingot.

6. In an ingot stripping apparatus, comprising two pairs of oppositely opposed main levers, `each pair connected together to form a fulcrum at an intermediate point, auxiliary levers pivoted to the main levers having ingot gripping means formed thereon adapted to engage an ingot, hoisting means for raising and lowering the levers, independent connections between the hoisting means and the main and auxiliary levers, means for initially raising both the ingot and the mold simultaneously, and 'means for exerting a downward pressure on the top of the mold and an upward force on the ingot.

7. In an ingot stripping mechanism, the combination with the ram, a cradle slidably mounted thereon, oppositely opposed main levers attached to the cradle and pivoted at an intermediate point to form a fulcrum point therefor, auxiliary levers pivoted to the main levers having ingot gripping means thereon adapted'to engage an ingot, a connection between the auxiliary levers and the ram and hoisting mechanism for 'raising and lowering theram and cradle together and independently of each other.

In an ingot stripping mechanism, the combinatiop with a ram, a cradle slidably mounted thereon, two pairs of oppositely opposed main levers attached to the cradle, each spaced apart and pivotallyconnected together to form a fulcrum at an intermediate point, auxiliary levers pivoted to the main levers below their fulcrum point having ingot gripping means formed thereon at their inner ends and ada ted to engage the sides near the top end oi) the ingot, a connection between the auxiliary levers and the ram, and means for raising and lowering the ram and cradle together and independently of each other.

9. In an ingot stripping mechanism, comprising two pairs o oppositely opposed main levers pivoted together to form fulcrum points therefor at intermediate points and la apted to contact with the top of the mold, means for connecting and spacing the main levers apart, an auxillary lever pivoted to each pair of the main levers having gripping means formed thereon for engaging the sides near the top of an ingot, hoisting means llO ;necting the two pairs of` bell-crank main levers together, auxiliary levers pivoted t0 and rotatably mounted between each air of the belLcrank main levers having its on; their inner ends VJforl engaging the sides near the top of the ingot, and hoisting means con-1y nected to the main fand. auxiliary levers adapted whenv raised to impart a downward pressure on the top of the mold yand an upward force on the ingot.

11. In an ingot stripping mechanism comprising two palrs of oppositely opposed bellcrank main levers, spaced apart and pivoted together at an intermediate point and adapted to have their lower ends engage the top of the mold, cheekplat'es lfor connecting the two pairs of bell-crank main levers together, auxiliary levers'pivoted to and rotatabl mountedbetween each pair of bell-crank mam levers having bits on their inner ends for engaging the sides near the to of the ingot, ho1sting means connected to t e main and auxiliary levers for initially raising both the ingot and mold simultaneously and thereby exerting a downward pressure on the mold and an upward force on the ingot.

12. In an ingot stripping mechanism, comprising two alrs of oppositely opposed bellcrankmain evers, spaced apart and pivoted together at an intermediate oint, said belle' crank main llevers having ong horizontal arms and short vertical arms adapted to have their lower'ends engage the top of the mold, cheek-plates for connecting the two pairs of bell-crank main levers together, auxiliary vlevers pivoted to and rotatably mounted between the vertical short arms of each pair cf bell-crank main levers having bits o n their inner ends for engaging the sides near the top of the ingot, hoisting means connected to the main land auxiliary levers for initially7 l raising both theingot and the mold simulthe top o taneously and apated to exert a downward pressure on the mold and an upward force-cf greater speed on the ingot.

13. In an ingot strlpping machine, the combination with a ram, a reciprocating cradle mounted thereon, tongs comprising oppositel opposed main levers for engaging ,the mold, means for connecting the v.nain levers together and form a pivotal point thereon, means for connecting the main levers to the cradle, auxiliary levers pivoted to the main levers for engaging the ingot, and means :for connecting the auxiliary levers to the ram.

a vvl5. In an ingot strlppmg combina tionv vwith the ram, a reciprocating cradle mounted` thereon, tongs comprising of main vlevers and adapte 14. In an in got stripping machine, the combination wlth a ram, a reciprocating 'cradle mounted thereon, tongs comprisingl two pairs of oppositely opposed spaced. mam levers for engagi the top of the mold,

gether and form a pivotalr pintthereon, inks for' 'connecting-the mainfleversvto the auxiliary levers and the ram.

che plates' the main levers and the cradle, an auxiliary and the ram.r

larranged to have their 'lower plates crank main levers' together and adaptedj'to.

. Y 0 means foi-connecting the mam levers to,-

machine; they twopairs o f oPpositely *opposed-,mainfleversfg or connectinv the two" 'pairs y to'form a pivlfl otal point` thereon, link connections between" Y lever pivoted to each pair'ofmaiil levers, rand link connections between the' auxiliary levers vform a fulcrum point thereon, link connec` tions betweenthe bell-crank main levers and the cradle, and auxiliary lever pivoted be-v tween the lower ends of each'pair of the bellcrank main levers adapted te form a fulcrmn point thereon andhaving ingot means frmed on their inner` ends, `an connectlons between the auxlliary levers and the ram.

17. In an ingot stripping machine, the;

combination with a ram, a 4reciprocating cradle mounted thereon, tongs comprising two pairs of oppositely opposedbe'll-'crank 'main levers, each having a comparatively long horizontal arm and a short vertical arm arranged to have*their lower ends contact with the ltop of a mold, thimbles *for spacing the bell-crank main levers apart, cheek-plates for connecting the two pairs of bell-crank 'main levers together and adapted to form a fulcrum therefor at the point of juncture-between the -horizontal and vertical arms, links connecting the outer ends of the bellcrank main levers with the cradle, an auxiliar 1ever pivoted between the vertical arms o the lbell-crank main levers below their pivotal oint and adapted to form a fulcrum there or, ingot gripping means formed on the` inner ends of the auxiliary levers, and link connections between the outer ends of the auxiliary levers and the ram.

18. In an ingot stripping machine, the combination with a ram, a reciprocating cradle mounted thereon, tongs comprising two pairs of oppositely opposed bell-crank main levers each having a comparatively long horizontal arm and a short vertical arm arranged to have theirlower ends Contact with the top of a mold, thimbles for spacing the bell-crank main levers -apart, cheek-plates for connecting the two pairs of bell-crank main levers together and adapted to form a fulcrum therefor at the point of uncture between the horizontal and vertical arms around which the arms are rocked, links connecting the outer ends of the bell-crank main levers with the cradle, an auxiliary lever pivoted between each of of the bell-crank main levers below their pivotal point and adapted to form a fulcrum therefor around which the said auxiliary arms may rock, ingot gripping bits formed on the inner ends of the auxiliary levers adapted to engage the ingot, link connections between the outer ends of the auxiliary levers and the ram, and means for raising the ram and cradle thereby exerting a downward pressure on the top of the mold and an upward force on the ingot.

19. An ingot stripping mechanism comprising a hoist, a ram, main levers and a rotatably mounted vingot gripping device attached thereto having link connections depending from said ram and operatively connected to said hoist.

ingot stripping mechanism comprising a hoist, a ram, a pair of pivoted tong members, an ingot gripping jaw pivoted to each tong member, a link connecting each jaw to said ram, and a link connecting each tong member to said hoist.

21. An ingot stripping mechanism comprising a hoist, a ram having a guideway, a member slidingly mounted on said guideway, a pair of tong members pivoted to said member, an ingot gripping jaw pivoted to each of said tong members, a link connectin each tong member to said hoist, and a connecting each jaw .to said ram.

22. An ingot stripping mechanism comprising a hoist, a ram de ending therefrom, a. cradle slidably mounted) thereon, a pair of tongs connected to the cradle, a jaw pivoted to said tongs, means to operate said ton and means connected to the ram to rock saitglsj aw.

23. An ingot stripping mechanism comprising a hoist, a ram depending therefrom, a cradle slidabl mounted thereon, a pair of tongs connectedy to the cradle, a j aw rotatably mounted to said tongs and connected to the ram, said jaw having an ingot gripping face eccentric to its axis of rotation, means to operate said tongs, and means to rotate said jaw.

24. A. device for stripping an ingot from its mold comprising main lever members for engaging the mold, means rotatably mounted on said main lever members adapted to grip the ingot, and means to rotate said means to move the ingot relatively to the mold.

the vertical short armsv 25. A device for stripping an ingot, a pivoted member for engaglng the end of a mold, means for supporting said pivoted member, a jaw member pivoted to said pivoted member adapted to grip the ingot, said jaw member having its gripping face eccentric to its axls of rotation, and means to rotate said jaw.

26. A device for stripping an ingot, a pair of tongs adapted to rest on the end of the mold in its open position, a j aw member plvoted to said tongs and having an ingot gripping face eccentric to its axis of rotatlng, means to close said tongs, and means to rotate said jaw.

27. An ingot stripping mechanism comprising means to grip an ingot, pivoted means for supporting the ingot gripping means adapted to engage the top of the mold and -to withdraw the ingot from a mold, and means to move said ingot relatively to said Withdrawing means.

28. An ingot stripping mechanism comprising means to grip an lngot, pivoted main means to engage the top of the mold and to move the ingot, and auxiliary means pivoted to the main means for moving the ingot independent of said main means.

29. An ingot stripping mechanism comprising means to grip an ingot, pivoted lever means adapted to engage the ingot mold top while moving the ingot, and means adapted to simultaneously apply pressure on the ingot mold and an oppositely directed pressure on the ingot actuated by the movement of the ingot.

In testimony whereof I hereunto ax my signature.

RICHARD H. STEVENS.

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