Патент USA US2137813код для вставки
N_ov. 22, A193.8. l Y " c. H. scHRAMM l soAKINGAPIT TROLLEY Filed sept. 28, 1955 2,137,813' ' 3" Sheets-sheet 1 Even/for; Cflîöc/era/îzm. Nov. z2, 193.8.` ¢_ „_ @Hmm 2,137,813 SOAKING-PIT ‘TROLLEY Filed sept. 28, 1935 lo ` «l ` " 5 sheets-sheet 2 ' ' ä ßfyâg. Y 4my» ` '/7 mw' c. l-qlr. 'scHRAM-M y Nov. 22, 1938. 2,137,813 soAKING-PI'LTROLLÉY Filed sept. 28,l 1955 s sheets-’sheet s" No. 0?“, ßízéorîzîys. 2,137,813 - Patented Nov, 22, 1938 r STATES ÜF F EL l 2,137.8l3 i somme-mfr ’rocher Christopher- Henry Schra, uslregon, Mich., assigner, _by :mesme assignments, to ¿ i l s nell d Moore, lino., New Worin N. lí., poration ot New .Mersey » Application September 2d, i935, aerial lilo. ‘MM5 (imi. 26d-lili) lli'he object oi. this invention is to provide a combined hoisting and traversing mechanism especially adapted to raise, lower ‘and traverse the hre-brick cover of a high-temperature fur - d nace of the door-installed type for heating in gots in steel mills. ln the prior art the cover of a soaking pit was attached to a machine or carriage running upon rails some three feet above the door. The car lli riage was not provided With'any hoisting mecha nism, the cover beingl raised and lowered by pro viding declivities in the rails‘.- When the car trolley namely, that on which the traversing motor is located. In Fig. 3, a indicates the door level', h the,throat of the soaking pit, c an annular recess in the door encircling the throat of the soaking pit, said re cess being nlled with sand, and d the cover of the pit, said cover having a ñange e adapted to be embedded in the sand when the cover is'in closed position to form a sea‘l. Rails f are mounted on the floor at opposite sides of _the furnace. These rails extend far enough away from the furnace so that the 4cover »may be removed laterally suiiicientlyl to uncover the throat b and asmuch farther as may be de GRV a riage rolled down the declivities the cover'was lowered onto the top of the furnace. Being thus l il im lowered sidewise -onto the furnace and traveling, The trolley comprises a rigid frame of gener as it didfa distance of about two feet during the , lowering operation, vit was impossible to provide ally rectangular form consisting' of 4two girders l and i and two transverse beams d and i. This a seal around the furnace opening. Because oi frame is provided with rollers to that run ‘on the `the absence» one. seal, the brickworlr of the iur sired. . i , , 20 nace was exposed to‘i‘spalling and distortion, so rails f. The rollers d at one end of the frame are that in a short vtime openings were produced through which intense heat was radiated. -'ll‘he uneven application 'of heat in the furnace, due to the loss of heat through openings around the furnace throat, caused uneven heating of the in arranged .to be driven by means including . a gots and compelled the workmen to rearrange the _ ingots in the furnace by means of the overhead electric ingot-handling cranei ycommonly pro vided ior that purpose. Moreover, the heat escaping through the openings around the iur nace throat caused rapid destruction oi the metal partsbinding the furnace together and produced 3 transverse shait t journaled on the girds l and l. Drive chains 'l communicate power from sprocket wheels on the shaft to sprocket Wheels fixed on the axles of said rollers. The shaft t is driven through _bevel gears d l(Fig. 2) from a shaft il, the latter being connected through a speed re ducer lll and a flexible coupling ll to an electric Ímotor it. Il ilA is a magnetic brake of any desired construction for stopping the motor and thus arresting the travel of the trolley. , The cover d may be suspended from the trolley at four equidistant points by any suitable means, warping of the cast steel rails on which the car riage operated. This manner of removing andV , as, for example, lugs g (Fig. 2) fastened to the replacing the cover resulted in great loss of heat, cover. These lugs have a pîn-and-slot` connec 35 damage to the rails upon which the carriage moved, disorder and delays in production, and danger to the workmen. By means oi the present invention an effec 40 tive seal is provided at the furnace throat, thus conserving heat, eliminating ìthe rapid deterio ration of rails and other structures heretofore experienced, improving the quality of the ingots, 'promoting increased eñiciency of the operating 45 personnel, and reducing operating costs. In the accompanying 'drawings l Figure 1 is a perspective view of a soaking pit trolley embodying the features of my invention. Fig. 2 is a. plan view of the trolley, the cover 50 being‘indicated by a dotted circle. Fig. 3 is a fragmental end elevationk of the trolley in operative lrelation to a soaking pit. Fig. 4 is an elevation of that side of the trolley . on which the hoisting motor is mounted. Fig. 5 is an elevation of the opposite side of the tion,‘as `shown in Fig. 3, to swiveling clevises lil. The latter are connected to rockers or bell cranks i5 and i6 which areY pivoted at Il in the beams 3 and t. The `pair of rockers on the beam 3 are connected to move together by means of a' reach 40 rod it, the rockers on the beam 4 being similarly connected. In _order that all four rockers shall swing in unison, the rockers .i6 ’are connected through pitmen i9 (Figs. 2 and 3) to a crank shaft 2li journaled in the beam-s 3 and 4. The- 45 shaft 20 is located at one side of the throat of the soaking pit, hence its bearings are some dis tance from the throat of the pit and thus some what removed from direct exposureto the heat. The crank shaft is driven through gears 2| from 50 a shaft 22. Power to drive the shaft 22 is ob tained from an electric motor 23 through a flex ible coupling 24 and a speed reducer 25. A mag netic brake 26 serves to stop the motor 23 when the cover has been raised or lowered, said brake ` 2,137,813 2 assisting t'o hold the cover elevated after it has been raised. A rotary type limit switch (not shown) of any preferred construction may be connected to the crank shaft 20 and adjusted to interrupt the circuit of the hoist motor 23 at the extreme points of crank throw, i. e., when the cover has been lifted to full height and when vthe cover has been allowed to rest >on the sand seal. . A limit switch 21 (Fig. 5) connected into the circuit of the traversing motor I2 and located adjacent to the soaking pit is arranged to be engaged by a cam 28 on the trolley as the latter reaches such a position that the cover dis directly 15 over the pit, thereby stopping the traversing ' motor in that position. It will be seen that the construction herein dis closed eliminates all overhead apparatus, with the dangers incident to the use and maintenance 20 of such apparatus; that the trolley is so con structed as not to be damaged by the high tem perature conditions to which it- is constantly ex posed; that the cover d is directly beneath and approximately enclosed by the trolley and is 25 raised and lowered and moved horizontally ñxed distances without attention on the part of the operator; thatl excessive pressure cannot be placed upon the cover when the latter is lowered onto its seat, as the cover has a Boating connec 30 tion with the trolley; and that by the use of con ventional electric switches the trolley may be easily and safely controlled to raise, remove, re turn and lower the cover without exposing the operator or other` workmen to danger. In prior-art instances wherein the cover was moved by a carriage, special apparatus was pro vided at one side of the soaking pit for supporting and traversing the carriage. The driving‘motor was stationarily located along or near the path of travel of the carriage. This arrangement en tailed loss of space in the building and placed limitations upon the location of the pits, it being understood that in practice a number of soaking pits must be accommodated in the building and provided with cover-handling means. My apparatus is compact and self-contained, the motors that raise, lower and traverse the cover being mounted on the carriage. Thus the' apparatus occupies a minium amount of space 10 and does not necessitate any uneconomical ar rangement of the pits. ‘ I claim as my invention: The combination with a soaking pit of the floor-installed type having a cover adapted to rest upon the floor, of rails located on the floor at opposite sides of the pit, a trolley mounted on said rails and adapted to be traversed -from a position directly over the pit to a position at one side thereof, said trolley comprising two girders 20 disposed parallel to respective ones of said rails, roller means on said girders engaging the rails to support the trolley‘thereon, and two transverse beams connecting the ends of said girders to form a rigid rectangular frame, means _on the trolley 25 for raising and lowering the pit cover comprising a pair of bell-crank levers pivotally supported on each of said beams and removably connected with the pit cover, means connecting each pair of bell cranks together for simultaneous operation, a shaft extending across the trolley and journaled on said beams, crank arms mounted on said shaft adjacent said beams, each crank arm being con nected with one of said bell crank levers whereby to rock the levers and thereby raise and lower the 35 pit cover in response to the rotation of the shaft, and vmeans including a motor mounted on one of said girders for rotating said shaft. . CHRISTOPHER HENRY SCHRAMM.