US1161164A - Internally-protected sheet-metal receptacle. - Google Patents

Description

W. A. SEXTON.

INTERNALLY PROTECTED SHEET METAL RECEPTACLE.

APPLICATION FILED DEC-26.19l4.

Patented Nov. 23, 1915.

ii a T WILLIAM A. sfn'xron, or NEWTON, MASSACHUSETTS.

INTERNALLY-PROTECTED SHEET-METAL RECEPTACLE.

To all whom it may concern:

Be it known that I, WILLIAM A. SE) (TON, a citizen of the United States, and resident of Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Internally-Protected Sheet-Metal Receptacles, of which the following is aspecification.

This invention relates chiefly to metal receptacles or cans made of tin plate or other metallic sheet material, tin plate being sheet iron coated with tin.

It is a well-known fact that sheet metal receptacles or cans, if used for containmg certain materials, such as liquid shellac, discolor the contained material.

It is also well known that protective layer of material which is insoluble by the alcohol in liquid shellac, and is capable of resisting the action thereof will not adhere to a metal surface, so that a sheet metal can cannot be protected by applying a protective layer, such as that hereinafter described, which is insoluble by alcohol, directly to its internal surface. It is therefore customary to store material such as shellac in non-metallic vessels of earthenware or glass, such vessels beingobjectionable on account of their frangibility, cost and weight. I

I have discovered that a sheet metal receptacle, adapted to hold liquid shellac and other like material without discoloring the same, can be produced by cementing a nonmetallic sheet material, such as paper, to

the inner surface of the metal, such nonmetallic material being adapted to adhere closely to metal surfaces, and then apply- -i ng to the non-metallic lining thus formed a protective coating which is adap ed to resist the action of shellac and other materials liable to discoloration by contact with tin or other metal, said protective coating adhering inherently "to the non-metallic lining.

My invention consists in the improved 1nternally protected sheet metal receptacle hereinafter described and claimed.

Of the accompanying drawmgs forming a part of this specification: Figure 1 represents a perspective viewv of a sheet metal plate of indeterminate area coated on one side with non-metallic sheet material and adapted to be cut up into blanks forming the members of a sheet metal receptacle or can; Fig. 2 represents a vertical section of Specification of Letters Patent.

a sheet metal can made from the laminated sheet shown by Fig. 1; Fig. 3 is a sectional view showing portions of the three can members before they are united; Fig 4: is ail-enlargement of a portion of Fig. 2, showing the protective coating hereinafter described.

The same reference characters indicate the same or similar parts in all the views.

In carrying out my invention I prefer to proceed as follows: Taking a sheet a of ordinary tin plate, or other metallic sheet material, I cement to one side of the same a non-metallic lining layer 6, preferably of paper. 1 have used for the layer Z) the socalled Kraft paper, but I do not limit myself thereto. I find that paper may be permanently united to a metal surface by various kinds of paste, glue or cement. The lining layer 6 entirely covers one side of the metallic layer a 1 next cut up the laminated sheet constructed as above described, to form blanks for the members of a sheet metal can, the form of the members depending on the form of the can. I have indicated by dotted lines in Fig. 1 the lines along which the laminated sheet may be cut. It will be seen that each member cut from the metal sheet is wholly covered on one side by non-metallic sheet material.

Fig.2 illustrates a can formed by assembling members out from the laminated sheet, 12 representing the body, 13 the bottom, and 14 the top or head of the can, there being at least three members, and the form of both ends of the can being determined by the joints which unite said members.

The members out from the laminated sheet are formed and united in accordance with the ordinary practice of making sheet metal cans, said membersbeing preferably united by seamed joints 15, and each member and its lining layer being handled as one piece or part during the operation of assembling the, members. The non-metallic lining layers of the can members, being co-extensive with the inner sides of said members, eXtend through the joints and pack the latter,as shown by Figs. 2 and 4, the material of the non-metallic layers being compressible, and compressed by the joint forming portions of the can members, and therefore contributing to the tightness of the joints. 4

A can constructed as thus far described may be used for various purposes Without Patented Nov. 23, 1915.

Application filedJJecember 26, 1914. Serial No. 879,177.

the protective coating hereinafter described, but said protective coating is essential-for cans intended to contain materials liable to discoloration by contact with metal and capable of seeping through the non-metallic lining layers.

To complete the internal protection of the can, I apply to the non-metallic lining tective coating is shown insolid black, and

is designated by the reference letter 0.

' It should be borne in mind that while the described coating will not adhere satisfactorily to a metal surface and is liable to flake or peel therefrom, it is firmly maintained by the-non-metallic lining layer 5 in the form of a continuous protective layer covering all parts of the inner surface of the can and entering the crevices adjacent to thejoints 15. Owing to the fact that a part of the material of the protective layer is absorbed, as above stated, by the lining layer, the protective layer may be said to be reinforced by the lining layer, and prevented from crackingas well as frompeeling or flaking off.

I have found that a sheet metal can protected as described is capable of holding shellac for along. period without the slightest discoloration. i p

My invention is not limited to the mate- I rials herein described for the lining layer and the protective coating. Neither is my invention limited to the protection of tin plate in the manner described, it being obvious that other varieties ,of sheet metalmay be similarly protected.

As above intimated, the sheet metal may be-protected and its joints packed only by the non-metallic lining, the protective coating being omitted when the can is intended to hold materials which will not be discolored by contact with the metallic surfaces due to seepage through the non-metallic lining.

I am awarethat it hasbeen proposedto coat the interior of a sheet metal can with asphaltum cement composed 1 of. asphaltum dissolved in a suitable solvent. While asphaltum cement may adhere firmly to sheet metal, it is soluble in alcohol, and is therefore incapable of protecting the metal against liquid shellac, the fact being that a coating of asphaltum cement would be speedily dissolved by the alcohol contained in. liquid shellac,.so that the shellac would be discolored not only by contact with the sheet metal, but also by the dissolved cement.

I have found that a coating of material such as linseed oil varnish, which is insoluble in alcohol, will not adhere to sheet metal and will adhere to'paper, which in turn is adapted to be firmly cemented to sheet metal. Having described my invention, I claim:

1. An internally protected sheet metal receptacle formed of a plurality of interengaged blanks, and having a non-metallic layer of flexible fibrous material possessing a substantial degree of toughness and strength cemented to and coextensive with the blanks of which the receptacle is formed, said layer being extended into and packing the joints where said blanks are interengaged in the completed receptacle.

2. An internally protected sheetmetal receptacle formed of a plurality'of interengaged blanks, and having a non-metallic layer of flexible fibrous material possessing a substantial degree of toughness and strength cemented to and coextensive with the blanks of which the receptacle is formed, said layer being extended into and packing the joints where said blanks are interengaged in the completed receptacle, and a protective coating which is inherently adherent to said lining and partly absorbed and reinforced thereby.

3. An internally protected sheet metal rcceptacle formed of a plurality of interengaged blanks, and having a non-metallic layer of flexible fibrous material possessin a substantial degree of toughness an strength cemented to and coextensive with the blanks of which the receptacle isformed, said layer being extendedinto and packing the joints Where said blanks are interengaged in the completed receptacle, a protec-' tive coating which is inherently adherent to said lining and partly absorbed and reinforced thereby, said coating being insoluble in alcohol andnon-adherent to the metal of which the receptacle is constructed.

In testimony whereof I have aflixed my signature, in presence of two witnesses.

WILLIAM A. SEXTON. Witnesses:

P. w. PEzzETTi, C. F. BROWN.

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