US2163727A - Removable top for soaking pits - Google Patents

Description

' Patented June 27, 1939 2,103,121 REMOVABLE 'ror son soAnrNo rrrs William Dean, Gary, ma. Original application October 12, 1936, Serial No.

Divided and this application May 17,

1937, Serial No. 143.220 4 3 Claims. (cl. 288-10) This application is a division of my application Serial No; 105,336, filed ,.0ctober 12, 1936, for Soaking pits and like heating furnaces, and the invention relates specifically to covers or doors for said pits and the means for retracting the same.

Retractable covers or doors as heretofore builtv leave much to be desired in point of life and insulation. Where such covers are supported by a truck carried on rails along the'side of the pit,

sumcieht space for overlap is lacking; the view or the pit by the cra'neman is limited; and high cover and pit top repairs follow. Wherefthe covers are carried on trucks, it is impossible to secure good sealing because, if the cover be lowered to seat well, the weight is oi! the axles and no traction remains. Unless covers are well sealed, they permit serious heat losses as well as infiltration at times and damage to the cover edgecastings and channeling vofpit tops. For small pits, covers may be made with a cast steel frame lined with a spherically shaped arch of fire brick. For large pits, however, it is necessary to use structural cover frames, for which 2 spherical arches are not suitable because of the difllculty of providing for the arch thrusts and because of the volume of space formed beneath such arches. This has forced the-useof flat or ,suspended arches of refractory units, supported by special hanger castings that rest upon the structural frame members. This type of cover is expensive in first cost and short lived because there is no means of keeping the brick elements tight, and further insulation cannot be applied as the hanger vcastings becomes overheated. The racking of such-covers due to movements accentuate the difllculties.

One object of the present invention is to provide. a multiple arched cover which will afford a readyaccess to recuperators for inspection and cleaning and which may be insulated; also a cover that will remain tight in spite of, movements, reducethe number of special brick shapes 1 required, and eliminate hanger castings sus-,- ceptible to damage by heat.

Other objects are to provide means for lowering and sealing covers on pit tops; to avoidthe use of retracting mechanism in hot zones; and

" to eliminate hydraulic cover operating mechi Inthe accompanying drawing-- Figures '1 and 2 are, respectively, a vertical longitudinal section of a portion of t h e pit, and a top plan view of the same together'with its as portable cover andthe carriage through means of which the said cover is transferred from open to closed position; and

Figure 3 is a detail sectional view, on an enlarged scale, of one of the intermediate suspending skews employed in the cover organization 5 shown in Fi ure 1.

Referring to Figure 1 which shows a partial sectional elevation of a soaking pit with an improved cover II, to Figure 2 which shows a partial plan view of same, and to Figure 3 which 10 shows a section through one of the intermediate skew backs 28b and alloy supports for said cover, the cover comprises a series of short arches 28a across the short dimension of the cover. The end skew backs 280' are supported by the end 15 frames "list each end and by suspended alloy bars Be at intermediate poirits. The arch thrust is taken by the side frames of the cover supple- .meiited by a heavy central arch tie rod 28f. The

skews] are made from first quality fire brick and are the only special shapes required. The arch brick 38a may be standard 9" brick or may be 2500 degree insulating brick, requiring no extrar'ieous insulation and greatly reducing the total weight of a cover. If standard fire brick arches be, used. additional insulation may be added withoutfear of destroying the supporting hangers. As shown in Figure v3, skews 28b are made in two mated parts that embrace the alloy hanger bar 28c, while copper radiator bar 289 is welded 30 to the alloy hanger bar between the supporting alloy bolts 2th and projects above the brick skews for exposure to atmosphere in giving oil its heat and preventing overheating of the alloy bar which is entirely surrounded by brick. O In practice, the alloy bar is rolled from chrome-nickel 1 (18/8) one and one-half by two inches and the radiator bar is one-quarter inch by six inches.

1 The cover frame comprises structural channels and beams Hi with bar cross bracing Illa 0 (Figure 2), all securely welded. A series of simple steel or alloy castings 28L along the ends, bolted to the frame members, support the end skews 2.0, while similar castings along the sides support standard flre brick blocks 28m and close the ends of the cross arches. v The completed cover is supported pivotally on its transverse center line from a pair of cantilevers 2! extending from a truck 30 placed at one end of the pit,'as shown. The truck is providedwith four wheels "a, Ilb, keyed to axles 30c and partially counterweighted and actuated by a motor drive comprising a motor 3i, reducer {la and chaindrive lib to one rear axle 30c. Wham-the cover is in place as shown, its weight 5 June 27, 1939.

I w. T. DEAN REMOVABLE TOP FOR SOAKING PITS Original Filed Oct. 12, 1936 v Jzuemi'on fflam: I @244 r RI E .INIIIIIIII 'r A.

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