US1184654A

US1184654A - Coating sheet metal.

Info

Publication number: US1184654A
Application number: US63270811A
Authority: US
Inventors: Eric G Lindhe
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-06-12
Filing date: 1911-06-12
Publication date: 1916-05-23
Anticipated expiration: 1933-05-23

Description

E. G. LINDHE.

COATING SHEET METAL.

APPLICATION FILED JUNE 12, 191:.

Patented May 23,1916.

2 SHEETSSHEET @Mniar:

9 of. QI Md .6. Z3 12 M Mb 0mm w an ERIC G. LINIDHE, OF NEW YORK, Y.

' COA'JLING SHEET METAL.

illJWTJH-d ll.

Application-filed June 12, 1911.

To all whom it may concern:

Be it known that I, ERIC Gr. LINDHE, a

subject of the King of Sweden, residing in the city of New York, borough of Manhattan, in the county and State of New York, have invented a certain new and useful Improvement in Coating Sheet Metal, of which the following is a specification.

The invention relates tothe treatment of metal sheets preparatory to joining them in superposed condition in the production of shims or spacing-plates.

In U. S. Letters Patent No. 969,709, dated Sept. 6,1910, is shown and described a shim of this character composed of a number of thinsheets joined on their adjacent faces toforrn a unitary mass which may be reduced in thickness when required by stripping one or more sheets from such mass.

The object "of the present invention is to provide apparatus in which the cleansing of the sheets, coating with. sollder or other binder, and the application of a covering adapted to protect the surfaces from oxidation, may be performed rapidly and economically, with the necessary uniformity of deposition.

The invention consists in certain novel features of construction and arrangements of parts by which the above objects are at tained, to be hereinafter described and pointed out in the claims.

The accompanying drawings form a part of this specification and show the inven tion as it has been carried out in practice.

Figure 1 is a side elevation of the entire apparatus. Fig. 2 is a corresponding vertical longitudinal section. Fig. 3 is a plan view of the same. Fig. 4 is a transverse vertical section through the cleaning tank as on the line 4-4 of Fig. 2. Fig.5 is a similar view through the melting-pot, taken on the line 5-5 in Fi 2. Fig. 6 is an end elevation of the feedlng "mechanism, with certain portions omitted. Fig. 7 is an end view of the melting p'ot. Fig. 8 is an elevation of a pair of feeding rolls or pulleys. Fig. 9 is an end view showing a detail of the feeding mechanism. Fig. 10 is a corresponding plan view. The remaining figures are on a larger scale. Fig.,11 is an elevation of the-cutting-ofl mechanism. Fig. 12 is a corresponding vertical section. Fig. 13, is

Specification of Letters Patent.

Patented May 23, 191%. Serial No. 632,708.

an elevation of the mechanism employed for applying the non-oxidizing covering. Fig. 14: 1s a corresponding vertical section.

Similar letters of reference indicate the same parts in all the figures.

The material to be treated may be understood to be thin brass which is fed or drawn from a roll, passed through an acid or other cleaning bath, then coated on both faces with a binder of soft solder, and the protecting covering cut off in the desired short lengths.

When piled for the uniting treatment, the coated sheets are alternated with uncoat'ed sheets, the solder on both faces of the former being suflicient to join them to the latter, and therefore the apparatus is arranged to be easily changed for a run of material through the cleaning bath, heated, but not coated, and the protective covering applied as before and the strip cut to lengths. -As the material is extremely thin it is preferably fed by drawing it through the several parts of the apparatus to the point of cuttin o l is .a frame or table carrying at one end notched standards A receiving screwthreaded rods B extending through nuts B and having conical heads B adapted to engage the opposite ends of a tubular core M on which the'roll M of thin material is closely wound, and thus hold the latter in position to be drawn off by revolving between the conical heads B serving as centers, and bymeans of the nuts B permitting the tension to be controlled.

Mounted in the table A is a tank or receptacle (3 containing dilute acid or cleaning solution, and provided with a cover C having on its under face a depending frame C in which is supported two transverse tubes C C one, C is slotted longitudinally along its upper face, and the other, C, similarly slotted along its lower face, and-both loosely filled with wickin which protrudes through the slots, and at t e ends of the tubes dips intothe acid. The wicks serve to apply acid to both faces of the thin metal strip which enters beneath the rear end of the cover C passes over and in wiping contact with the wick in the tube C, under the tube C", across its wick, and emerges beneath the front end of the cover and passes over a rod C to the applied; the strip is then 25 Each has a longitudinally arranged fin D melting-pot D mounted in the same table A.

The melting-pot is received in a holder or heating-chamber D and is heated by suitable gas-burners D orotherwise. The pot is provided with a cover I) having depending arms'd on its under face in which are supported a transverse rod D and transverse tubes D D.' This cover acts'to retain the heat of the molten bath immediately over the surface thereof, so that the metal strip moistened by the cleaning solution is heated at its surface before being immersed in the molten solder, which-removes the cleaning solution and coats the freshly cleaned surface out of contact with the air. 'The strip from the rod C passes beneath the rear edgeof'the cover D and thence under the rod D lying beneath the surface of the melted solder and on leaving,

the latter passes beneaththe tube D and over the tube D; the tubes D D are preferably of copper :and are heated-by radiation from the melted metal and by-currents Copper is preferred for the tubes 5D. D, because of its go-odzheat."conduct ingprops.

ertiesf whi'ch serve in" keepingup the tem- 7 If the stripis not'tobe. coated sequentlycut'up into lengthsto .be piled "between two coated lengths, it-is ledthrough,

of hot products of combustion passing through them from I the heating-chamber.

preferably of aluminum; serving as a scraper, the on the tube D projecting downwardly and the other on the tube D"- upwardly. d is a .tubular .connection' from the heatingchamber D as seen in Fig. 5,

heat from the I said chamber passes-beneaththe' tube D and'over the Surplus solder is removed by .the 'finsD' and falls back into" the "pot,-.the fins" remainlng' clean by'reaso'n of the 'fact that solder will not adhere readily to aluminum.

perature of, the fins or scrapers. 'i

but i the cleaning'bath as beforelbuti'passes immedlately belowthe cover of .thejmeltingpot, and not through the bath of v meltedv metal. The, utility of passingthe material below the cover without immersing is that some stripsa're not tobe coated withsolder but are to ,lieibetween two solder-coated sheets, such sheets are drawn through below the cover to heat them or rather the strip to be cut into sheets, so that they will be'warm enough to melt the resin and thus protect their cleaned surfacesfrom oxidation, ready. to join the soldered surfaces by the adjacent sheets. In' either case it is necessary to apply a covering or film to protect the surface against oxidation and 1 thus insure uniform adhesion .over the entire surfaces when the solder .is melted tounite the mass. This protection may be attained by the use of various materials; thin cakes or plates E of resin suitably mounted to contact with both faces of the strip as it is drawn between them while stillwarm will serve the purpose. As the strip is very thin it is extremely diflicult to guide, and it has been found preferable to mount the plates or cakes E with liberty to follow the lateral movements of thestripsrather than attempt to control the latter.

E is a vertical frame or flat pocket adapted to receive loosely the two cakes E -E,

mounted on grooved rollers E running on a track E on a supporting plate E having apertures e 0 adapted to receive fixed horizontally extended rods on which the plate is carried. A transverse slot e in each face of the frame E receives the strip M with one cake above and the other below it and the cakes are pressed against the surfaces by a loop or belt E lying upon the upper edge of the upper cake and beneath the lower edge of lower cake with the bight E". at each side' passed over a pulley E mounted on the frame E and partially encircling a free pulley. E from which is suspended a tension weight E.

' E E are braces on the supporting plate E1" and having rollers' E on their upper ends arranged to roll. upon the upper portion of the forward face of thejframe and permit the latter to move laterally, and E E are similar braces fastened to the rear face of the plate E with-their upper ends lying against the rear face of the frame. Thus arranged the strip is pulled through the slots e? between the. adjacent edges of the resin-cakes. with its temperature high enough to melt the .resin 'slowly while in TCOIltitCt therewith and thus completely cover "both faces -of the strip with athin film sufiicient to protect the surfaces against oxi dizing or. harmful results'of handling. The belt E and its weights E serve to hold .;the cakes yielding'ly against the strip with uniform pressure and feed-"them toward "ea-ch other as they are slowly consumed. ,"The-rollersjl l permit the frame to move laterally in accommodating itself to "the movements of the thin stri 'M.

I The rods on which the p ate E ed may be those marked A A on'the front of the ,table' A,..to be'used when the strip is tobe cleaned and warmed but notcoatis mounted with solder, and .is' therefore mounted near the melting-pot so that the strip will retain suflici'e'nt heat to affect the cakes, or, in the case of the coatedfistrip. in which the temperature is higher, theqrods may be those marked A A located at a greater distance from the melting-pot on the stand A to allowthe temperature to lower enough to harden the coating before passing benieaeta tween the cakes. The location and length of the rods A A permit the frame E to be adjusted to present the strip in either case at the desired temperature. The supporting plate 1E and pocket or frame thereon may be easily transferred to either pair of rods as found necessary or desirable.

The stand A carries the feeding and cutting-ofl mechanisms. Experiment has demonstrated the great difficulty of guiding strips of the extremely thinmaterial used, two one-thousandths of an inch being the preferred thickness, and the impracticability of running such material in straight paths by means of gripping rolls. The feeding mechanism shown comprises. two pairs of horizontal pulleys F F mounted in standards A A with a belt F running on the uppermost of each pair and a similar belt F running on the lowermost; the'pulleys', F F of each pair are separated sufliciently to avoid gripping the strip M between them, as are also the adjacent faces of the belts. The midlength portion of the upper member or stretch of the lower' belt F is slightly raised and supported on a plane bed F having its ends curved slightly downward, and the lower member of the upper belt F is pressed downward toward the bed F by rollers F F mounted in pivoted arms F F drawn downward by springs F into contact with the other belt member. The belts travel at the same speed and are driven by a shaft F through a pinion, not shown, in mesh with a gear-wheel F on the shaft of the lower forward pulley F which in turn is in mesh with a similar gear-wheel F on the shaft of the upper pulley F of-the same pair. The strip M is engaged frictionally by the fiat adjacent surfaces of the belts, thus lightly grasping the strip between broad areas of the moving belts which are flexible enough to be unaffected by slight surface corrugations or irregularities in the strip and successfully carry the latter forward in the straight path of the belts even though the edge of the strip may be waved or otherwise irregular, with a grip of Suficient force to pull the strip from the roll at the rear end of the apparatus and through the various parts in which it is treated.

The cutting-off mechanism is at the forward end of the stand Af and consists of a fixed lower knife G mounted on the stand with its cutting edge flush with a rearwardly extending shelf G and a slide G? mounted on vertical pillars A A, carrying a spring presser-foot G and the upper knife Gr. At the top of each pillar A is an extension or stud A of smaller diameter, encircled by a helical spring G abutting at the upper end against the interior of the slide and having sufficient strength to raise the latter and its attachments.

G G are links pivoted one oneach side tothe slide G near the top, and pivotally connected at the lower ends to levers G Gr pivoted to the stand at 9. Each lever carries a roller G in the path of a nose or projection G on a cam-disk G mounted on the shaft of the forward upper pulley 18. At each revolution the projections G strike the rollers G and depress the levers which through the links G draw the slide G downward, the spring presserfoot momen tarily arresting the forward movement of the strip M during the descent of the upper knife G by which the strip is severed; the end of the thin strip between the contacting portions of the belts F F and the presserfoot G may buckle slightly during this cutting-off movement but as it is almost instantaneously performed is not injurious. The slightly buckled end immediately straightens by its own elasticity and passes on between the knives to be cut off at the completion of the next revolution. The severed length is received in a chute A and directed to any suitable'receptacle or to a traveling apron, not shown, to be delivered for further treatment.

Runs are made by the apparatus to produce a desired number of lengths of cleaned, solder-coated, and covere d material, and is then changed, as before described, to produce the desired number of lengths of.

other spacing-plates may be cut by dies or otherwise.

In the present apparatus the steps of the process include, in one case, cleaning in a suitable bath, heating to a degree sufficient to melt the material serving as a protecting covering, applying such covering, and cutting into lengths. In the other case or arrangement the steps comprise, the cleaning, coating with solder, and while heated aplying the protective covering, and the tutting-ofi.

I claim 1. The process of coating a sheet which comprises applying a molten coating material to the strip, heating the strip thereby, and softening a second material by contact with the heated, coated strip to form a second coating.

2. The process of coating a sheet which comprises applying a cleaning solution to the surface of the sheet, coating -the strip with molten metal, and then applying a second coating material by contact with the heated strip to soften said second material and spread it over said first coating.

3. The process of coating a strip which comprises applying a molten coating to said strip, cooling the coating slightly, and then lllltt applying a second coating material by contact with the strip to soften said second material and spread it over said first coating.

4. The process of applying a composite coating to a metal sheet which comprises coating the sheet with a molten material of relatively high melting point and then fusing a second coating of relatively low melting point on said first coating by the residual heat'of said first coating.

5. The process of applying a composite coating to a metallic sheet which comprises coating the sheet with a molten metallic material of a relatively high melting point and heating the strip, partially cooling said coating, and then fusing a second coating of non-metallic material of relatively low melting point by the residual heat of said first coating. 6. The process of applying a composite coating to a sheet which comprises applying a cleaning solution to the surface of the sheet, then coating the sheet with a molten material of relatively high melting point to remove the cleaning solution and heat the" strip, partially cooling the coating, and then formmga second coating of lower melting point by fusing it on said first coating by the residual heat of said first coating.

7. The process of cleaning and coating a metal sheet which comprises applying a cleaning solution to the sheet, heating the sheet, and then applying a coating material to the sheet while moistened by the cleaning solution to simultaneously remove the impurities and coat the sheet.

8. The process of cleaning and coating a metal sheet which comprises applying a cleaning solution to the sheet, heating the sheet while moistened by the cleaning solution, and then coating the sheet while heated and moistened.

9. The process of cleaning and coating -metal. sheets which comprises applying a cleaning solution to the surface of the sheet,

heating the sheets while moistened by the cleaning solution, and softening the coating material by contact with the heated strip to form a coating therefor.

10. The process of treating continuous strips of thin metal, which consists in cleanby the heat thereof softening the same and causing it to adhere while in such condition to the surfaces of said strips.

12. The process of coating sheet metal which comprises passing the sheet through a bath of molten metal of relatively high melting point, partially cooling the coating passing the sheet through a second coating material.

of relatively low melting point and utilizing theresidual heat of the first coating operation in effecting the, second coating operation.

In testimony that I claim the invention above set forth I afiix my signature, in presence of two witnesses.

ERIC G. LINDHE. Witnesses:

CARLTON N. ABORN, CHARLES R. SEARLE.