US171686A - Improvement in apparatus for coating metal plates - Google Patents

Description

E. MOREWOOD & I. H. ROGERS. APPARATUS FOR COATING METAL PLATES.

Patented Jan.4, 1876.

lumen/2227's: W

Wiiwessea Mm% d am MPETERS. PHOTO LITHUGRAPMEFL WASHINGTON. D. C.

. sheets of metal with tin, terne, or other metal,

one side, and, after having passed between the rollers E E. zis a pan or vessel, made of crukept heated more evenly throughout, and that side the bath to keep up its temperature, and

'UNITED STATES PATENT OFFICE. I

EDMUND MOREWOOD, or LLANEDLY, AND JOHN HENRY ROGERS, OF LLA'NGENNEGH ARK, NEAR LLA ELLY, GREAT BRITAIN.

IMPROVEMENT IN APPARATUS FOR COATING METAL PLATES.

Specificationforming part of Letters Patent No. 171.686, dated January 4, 1876; application filed January 15, 1875.

To all whom it may concern:

Be it known that we, EDMUND MOREWOOD, of Llanelly, and JOHN HENRY ROGERS, of Llangennech Park, near Llanelly, Oarmarthenshire, Great Britain, have invented certain Improvements in Coating Metals with Tin, Terne, or other Metals or Alloys,.and in apparatus therefor,of which the following is a specification:

Ourinvention relates to an improvementin the bath containingthe melted metal, whereby a portion of its surface is excluded from the atmosphere by a pan containing sand or other slow conductor of heat, and the under surface of this pan is provided with a sheet-metal scraper for removing dross or scurf. We also employ an improved flux-pot, for rendering theaction of the flux more uniform upon plates that are cold or wet ;'said improvement relating to receptacles for sand, applied between th e flux-pot and thebath of melted metal at each side of the space through which the plate passes.

In the drawing, Figures 1 and 2 are vertical sections of the pots or baths for coating said views being transversely of the coatingrollers and Fig. 3 is a plan, and Figs. 4 and 5 are vertical sections, of the flux-pot. v

The bath 0 contains coating-metal, and also a series of pairs of rollers, D D, and guides g. The plates to be coated are made to enter at pairs of rollers D D and guides g, are delivered at the other or opposite side, where the plate, on leaving the last pair of the said coating-rollers D D, is caught by the finishingciblcearthenware or other suitable material, and placed in the bath, as shown, so that. it rests upon, and sinks more or less into, the melted coating-metal. This pan 2 is filled with sand or other slow conductor of heat; and the effect of this arrangement is, that the metal is the heat of the metal bath is better retained. Hence, a less degree of heat is required outthe bath is rendered more durable. The pan is out of the way of the rollers and the guidingframes 9; and this pan 2 may readily be applied to other descriptions of vessels used for containing coating-metals. F is a sheet or plate, which is moved occasionally during the working of the apparatus, in order to prevent scurf or other foreign matters from accumulating upon the pan-bottom. It may be drawn right through, entering at one side, and coming out at the other. It has loops for taking hold of it, or hands made of sheet metal, fixed at one end for drawing it through. This plate will collect on its surface orsurfaces the scurf or other foreign matter, which can readily be removed from the pot. The rollers D D D ,D, Fig. 2, are so arrangedv as to efl'ect what may be termed an alternately over and under action as to form a supply or channel of melted coating-metal above the nip of these rollers, and

the sheets pass out through this exit-channel,

thereby givinga further coating to those parts which may have been imperfectly coated in the previous part of the process, or which would have had their surfaces too heavily covered or coated by passing through the nip of said rollers if entirely above the coating-metal, and without any channel of coating-metal between them. The scurf (especially in the case of tin) which is contained in the bath, and, by

the rollers, is carried upto the surface, and

which, by the re-entering of the rollers E E on the sides away from the nip, is left on back or exteriorside, can be easily withdrawn therefrom by means of a flattened rod of iron or other suitable means. I g

It is not advisable to keep a flux on the sur face of the exit-channel between these rollers. unless means are provided for readily removing it from the surface of the coated metal;

Hence, the coating-metal. rises above the nip of these rollers E E so far 1 around the edges, and so keeps it tight.

. grease on the outer sides of the rollers keeps a but when such means are provided, a flux in the said place enables the plates to be drawn out more rapidly, and bring out a thinner coatin g of metal on their surface, than if the sheets came out through clear coating-metal.

On the back or exterior sides of the rollers a suitable flux-such as tallow or grease-for tinpor terne metal is employed. The flux on the exterior sides of the rollers is keptfrom flowing toanyextent to the channel by means of the guard-plates G G, which fit loosely in and around-the grooves cut in the rollers E E.

The flux, on commencing work, soon thickens therollers hot, clean, and in proper order.

When the entering plates or sheets are wet,

. or: comparatively cold, they also tend to chill the flux or coating-metal as they enter.

In order to obviate the aforesaid inconveniencesweemploy an improved flux-box, in

which the lower part of the sides is made don ble, say, to aboutfive or six inches above the level of the coating-metal and between the pieces which form thesides of the box we place sand or other slow conductor of heat. Such flux-box may also be applied on the entrance side of the after bath.

Fig. 3 isa plan of our improved flux-box with'the circulating arrangements applied thereto. Fig. 4 is a vertical longitudinal sect1on, and F1g. 5 is a vertical cross-section.

A is the flux or grease box, comparatively of the flux-box.

2 a. ose

wide on the top, butnarrowing down to the bottom, which descends threewjor four inches: below the surfaceof theplnelted 3 coating metali I I are the chambers between the double sides In the chambers we place sand or other non-conductor of heat. C G is the coating-metal bath, into which theuplates or pieces of iron to be coated 'pass from the flux-box A. The circulating arrangement, in this case, consists of an overflow-gutter, d,

whichpasses along in a slanting direction,

as shown, and which allows the frothyoverflowing part of the flux to right itself during 1 its passage through said gutter, and to return EDMUND, MOREWOODJ JOHN HENRY ROGERS. a

Witnesses:

B. J ONES,

Solicitor, Llwnelly, South Wales.

HENRY THOMAS, his Clerk.

Images