US1708412A - Apparatus for treating sheets for tinning - Google Patents

Description

April 9, 1929.

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Mingus APPARATUS FOR TREATING SHEETS FOR .TINNING Filed Oct. 26, 1927 s Sheets-Sheet 2 WITNESSES INVENTOR April 9, 1929. s. E. DIESCHER 1,703,412

APPARATUS FOR TREATING SHEETS FOR TINNING I Filed Oct. 26, 1927 3 Sheets-Sheet 5 WITNESSES INVENTOR Patented Apr. 9, 1929.

UNITED STATES 1,708,412 PATENT OFFICE.

SAMUEL E. DIESCHER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 S. DIESCHER &, SONS, OF PITTSBURGH, PENNSYLVANIA, A PARTNERSHIP CONSISTING OF SAM- UEL E. DIESC HER AND AUGUST P. DIESCHER.

APPARATUS FOR TREATIN SHEETS FOR TINNING.

Application filed. October 26, 1927.

The invention has to do with the removal of liquid adhering to sheet metal, particularly that used in the manufacture of tin plate.

In the preparation of sheet metal for tin plating it, the sheets are black piclned in an acid solution and are then washed or swilled. The acid of the pickling liquid acts upon the iron of the sheets to produce copperas, which is held in solution in the liquid, and when the sheets are removed from the pickling to'the swilling bath, some of this copperas, as well as acid, is carried with them, and is not entirely removed from them in the swilling operation. i Vhen the sheets are subsequently annealed, the acid content of the water adhering to and lying between the plates attacks the iron and forms copperas in addition to that held in suspension in the water. If the plates are not highly heated, this copperas forms a deposit on the sheets which materially interferes with their subsequent proper tinning, and, if the plates are highly heated, there is danger of their sticking together.

The object of this invention is to provide a method for treating sheet metal subsequent to its having beenpickled, whereby water, and its content of copperas and acid adhering to it, may be efiectively removed, and to-provide a simple and practical apparatus for practicing the method.

In the practice of the invention a pack of sheet metal, having swillbath water adhering to its faces and lying between the sheets, is subjected to high pressure in such a manner as to effectively force the water to the edges of the plates from which it drains and is further removed by a drying air blast.

For thus pressing a pack of sheet metal, I have provided a machine, the preferred embodiment of which is illustrated in the accompanying drawings in which Fig. 1 is a vertical central sectional view of the machine; Fig. 2 a plan view; Fig. 3 a transverse sectional view-taken on the line IIIIII, Fig. 1; Fig. 4 a plan view of the bottom of a cradle support for a pack of sheet metal; and Fig. 5 an end view of the support shown in Fig. 1.

The machine comprises a pair of heads spaced apart to form a gap for receiving a pack of sheet metal, and includes a support for holding the pack between the heads.

Serial No. 228,813.

One of the heads is preferably supported by a fixed frame and the other by an element, preferably in the form of a hydraulic plunger movable towards the fixed head to close the gap between the heads and apply pressure to the pack. To maintain the center lines of various packs coincident with the central line of action of the plunger regardless of the width of plates forming a particular pack and tothereby avoid binding of the plunger, provislon is made for adjusting the pressure applying heads as well as the pack support with relation to the line of action of the plunger. Also, provision is made for moving the pack support to place the pack between the heads and to maintain the edges of the sheets in proper alignment with the heads both prior to and during a pressure applymg operation.

Having reference now to the illustrative embodiment of the invention, the machine comprises two fixed frames 1 and 2 rigidly connected to each other by heavy rods or shafts 3. Mounted in frame 2 there is a hydraulic pressing ram comprising a cylinder t attached to the frame and a tubular plunger 5 movable longitudinally of the cylinder. At its outer end plunger 5 is attached to a yoke 6 which is slidably mounted upon rods 3. Adjacent to the outer end of plunger 5 and to the outer face of yoke 6 there is a pressure applying head 7, and a similar head 8 is arranged adjacent to the inner face of frame 1. These heads are supported for vertical adjustment by the lower ends of rods 18 and 9 provided at their upper ends with worm wheels 10 and 11. Meshing with worm wheel 10 there is a worm 12 splined for longitudinal movement upon a shaft 13, the ends of which shaft are mounted in brackets 14 and 15. A second worm 16 is attached to shaft 13 and meshes with worm wheel 11, and the shaft is provided with a hand wheel 17 so that the rotation of the shaft causes simultaneous and equal rotation of head-suspending rods 18 and 9. The lower ends of these rods are threaded and engage nuts 19 mounted in and held against rotation by pockets formed in heads 7 and 8.

To the end that pressure may be progressively applied from a mid portion of a pack of plates outwardly to its edges, at least one of the pressureapplying heads is provided with an outwardly bowed spring plate so attached to the head that during the pressure applying operation it may be displaced into a plane. As illustrated in the drawings,

. both heads are preferably provided 'with such plates, head 7 with aplate 20 and head 8 with a plate 21. As seen in Fig. 2 the central portions of these plates, which are made of heavy spring metal, are bowed outwardly, and their ends are loosely engaged by brackets 22 which permit the plates to be displaced into planes.

For supporting a pack of plates between the heads, there is preferably provided a suspended cradle. As shown in the drawings this comprises a plurality of bars 25 having eyes at their ends for receiving rods 26, the bars being longer than the widest gap between the pressing heads 7 and 8, as seen in Fig. 1. Each end of each cradle rod 26 is pivotally attached to a bell crank lever having a vertically disposed arm 30 and a hori-' zon'tally disposedarm 31, the upper ends of arms 30 being'pivotally attached to cross beams32 and 33, and the inner ends of arms 310i adjacent levers being connected to each other by a compensating link 34. At its center, beam 32 is engaged by theupperend of a tubular plunger 35, the lower end of which extends into a pressure cylinder 36 formed in head 7. Similarly, beam 33 is supported at its center by the upper end of a tubular plunger 37, the lower end of which extends into a pressurecylinder 38 formed in head 8. For raising plungers 36 and 37 to elevate cradle 25, pressure fluid, preferably compressed air, is led to cylinders 36 and 38 through ports 39 and 40 formed in their walls. At their centers beams 32 and 33 are provided with upwardly extending racks 40 and 41 which mesh with pinions 42 and 43 attached to a rotatable shaft 44, pinion 42 being splined for longitudinal movement upon the 6 rearwardly, the outer end of cylinder 4 is provided with a plunger 46 adapted to move longitudinally in a cylinder 47 arranged centrally within the main cavity of cylinder 4.

7 Pressure fluid is let into cylinder 47 through a beam 49 and rods 50, yoke 6 and plunger 5 are also moved rearwardly, the yoke sliding upon the frame connecting rods 3.

ln'the operation of the press when used for removing water from pickled sheet metal, pressure applying heads 7 and 8 are first adjusted vertically sothat, depending upon the width of plates to be pressed, their centers will lie in the center line of movement of plunger 5, such adjustment being indicated in 1 fora pack of plates 55. This adjustment is effect-edby rotating shaft 13 by its hand wheel 17 the rotation of the shaft being effective through worms 12 and 16 and worm wheels 10 and 11 to rotate rods 18 and 9 in their nuts 19. Thereafter cradle 25 may be lowered somewhat for receiving the plates, although it may, if. desired, be held in its uppermost position with the cradlebars bearing on the lower faces of heads 7 and 8. For moving the cradle upwardly and maintaining it'in its upward position, pressure fluid is let into cylinders 36 and 38 of the heads throughtheir ports 39 and 40, it being understood that downward movement of the cradle is effected by gravity when the pres.

sure in cylinders 36 and 38 is reduced or removed. lVhen a pack of plates 55 is arranged upon cradle 25 between heads 7 and 8, fluid pressure is let into cylinder 4 through pipe 45 to cause plunger 5 and its attached yoke 6 to move head 7 toward head 8. During this pressure-applying movement, the yoke 6 slides upon rods 3, worm 12 upon shaft 13 and pinion 42 upon shaft 44, this worm and pinion being splined upon their respective shafts to permit, of the movements of the plunger yoke. I

As head 7 is thus moving towards head 8 the upper ends of the arm 30 of the cradlesus )ending bell crank levers move toward each other tending to a lowering of the cradle, which is counteracted by upward movements of tubular plungers 35 and 37 through pressure fluid constantly applied'in cylinders 36 and 38. The cradle is maintained in its proper horizontal position by reason of the compensating link connections 34 between the inner ends of hell crank'lever rods 31, the effect of which is to maintain the lever arms 30 on opposite sides of the cradle at uniform inclinations to the vertical.

By reason of the outwardly bowed spring plates 20 and 21, pressure is first applied to the central portion of a pack. As hear 7 is moved further towards head 8 these spring plates yield inwardly to progressively apply pressure towards and to the ends of he plates, with the result that the water and its content 'of copper-as and acid'is gradually forced to the edges of the pack. Cradle25 may then be lowered by permitting pressure fluid to escape'from cylinders 36.and 38, and when the cradle is thus lowered all sides of the pack are freely exposed. J ets' of compressed air may then be applied to the edges of the plates to remove the water adhering to them, after which the cradle may be again raised to support the pack while plunger 5 and its attached yoke 6 is moved rearwardly by applying pressure to cylinder 47 through pipe 4:8. If desired, or found necessary, the pressurenpplying operation may be repeated, first spreading the plates so that air may be entrapped between them to assist in expelling the remaining water when pressure is again applied.

so treating sheet metal after it has been pickled, practically all of the water adhering to and between its faces, and its content of copperas and acid, is removed from the sheets 'ith the result that the copperas will not later interfere with proper subsequent tin ning of the sheets.

A ccording to the provisions of the patent statutes, I have explained the principle and mode of operation of my invention, and have illustrated and described what I now consider to be the best form of apparatus for practicing it. However, I desire to have it understood that, within the scope of the appended claims, the invcnt-ion may be practiced with other forms of apparatus than that specifically illustrated and described.

I claim as my invention:

1. Apparatus for removing liquid from a pack of sheet metal, comprising a pair ot plate-engaging heads spaced laterally trom each other, vertically adjustable means for supporting a pack of sheetmetal on its edge between heads, and means for closing the gap between said heads to apply pressure to the pack.

2. Apparatus for removing liquid from a pack of sheet metal, comprising a pa1r of plate-engaging heads spaced laterally from each other, vertically adjustable means for supporting a pack of sheet metal on its edge between said heads, and a horizontally movable ram for closing the gap between said heads to apply pressure to the pack.

3. Apparatus for removing liquid from a pack of sheet metal, comprising a pa r of plate-engaging heads spaced laterally rrom each other, a cradle pivotally suspended from above said heads for supporting a pack of sheet metal on itsedge between the heads, means for closing the gap between said heads to apply pressure to the pack, and means for urging said cradle upwardly as said heads.

approach each other. v j

4. Apparatus for remov ng liquid fro m a pack of sheet inetaheomprising a pair or oppositely disposed heads, 'an outwardly bowed spring plate mounted on the face of one or said heads for displacement into a plane, means for supporting a pack of sheetmetal with its faces parallel to said heads; and means for closing the gap between the heads to progressively apply pressure through said spring plate from a mid portion to edges of the pack.

5. Apparatus for removing liquid from a pack of sheet metal, comprising a pair of oppositely disposed heads, each provided on its face with an outwardly bowed spring plate mounted for displacement into a plane, means for supporting a pack of sheet metal with its faces parallel to said heads, and means for closing the gap between said heads to progressively apply pressure through said spring plates from a mid portion to edges of the pack.

6. Apparatus for removing liquid from a pack of sheet metal, comprising a pair of oppositely disposed heads, an outwardly bowed spring plate mounted on the faces of one of said heads for displacement into a plane, means for supporting a pack of sheet metal with its faces parallel to said heads, and a reciprocable ram for closing the gap betwee said heads to progressively apply pressure through said spring plate from a mid portion to edges of the pack.

7. Apparatus for removing liquid from a pack of sheet metal, comprising a fixed frame and ahorizontally reciprocable ram each provided with a head having a vertical plateengaging face, means for simultaneously adjusting said heads vertically, and means for supporting a pack of plates between said heads with their lower edges flush with the bottoms of said heads.

8. Apparatus for removing liquid from a pack of sheet metal, comprising a fixed frame and a horizontally reciprocable ram each provided with a head having a vertical plateengaging face, means for simultaneously adjusting said heads vertically, and a vertically movable cradle for supporting a pack of plates between said heads with their lower edges flush with the bottom of said heads.

9. Apparatus for removing liquid from a pack of sheet metal, comprising a fixed frame and a horizontally reciprocable ram each provided with a head having a vertical plateengaging face, means for simultaneously adjusting said heads vertically, a suspended cradle for supporting a pack of plates between said heads, and means for moving said cradle upwardly to maintain the bottom of the pack flush with the bottom of said plateeng ging heads when said ram moves towards raid fixed plane.

10. Apparatus for removing liquid from a pack of sheet metal, comprising a fixed frame and a horizontally reciprocable hydraulic ram each pro *iCletl with a head havlng a vertical plate-engaging face, means for simultaneously adjusting said heads vertically, a suspended cradle for supporting a pack of plates between said heads, and pressure actuated means for moving said cradle upwardly to maintain the bottom of the pack flush with the bottom of said plate-engaging heads when said ram moves toward said fixed frame.

11. The method of treating Wet sheet metal after it has been pickled, which comprises 5 subjecting a pack thereof to high pressure to remove Water and its content of copperas and acid from the surfaces of the plate.

12. The method of treating Wet sheet metal after it has been pickled, which comprises subjecting a pack thereof to high pressure to remove Water and its content of copperas and acid from the surfaces of the plate; the pressure being applied progressively from a mid portion to edges of the pack.

In testimony whereof, I sign my name.

SAMUEL E. DIESCHER.

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