US910814A - Covering metals. - Google Patents

Description

G. HELLMIGH. COVERING METALS. APPLICATION FILED MAB. 10, 1906.

Patented Jan. 26, 1909.

mwb: I L01 UNITED STATES PATENT O FFICE. GARlL HELLMICH, OF DETROIT, MICHIGAN, ASSIGNOR O-F ONE-HALF Tf) JOSEPH KAUFMANN,

OF DETROIT, IVIIGHIGAII.

COVERING METALS.

Specification of Letters Patent.

Patented Jan. 26, 1909.

Application filed March 10, 1906. Serial No. 305,266. I

'- ferent from that of the core, an exam l e being the brass or copper covered rod or 'ar used in the manufacture of various useful and ornamental articles.

Sheathed bodies of the character described are very desirable on account of their bei rustless and by reason of the superior .finis and ornamental appearance the sheathing or covering provides, and are extensively used in place of solid non-oxidizable metals by reason of-the relatively small cost of production, the core forming the major portion of the body being of an inexpenslve metal,

'- covered rods or bars,in which the seam or as iron. The difficulty that has existed in the past,, however, has been the production of a sheathed body in which the sheathing or covering would not crack or en at the joint during the bending of the ody into the desired article of manufacture, and a further drawback has been the conspicuousness of the seam or joint.

The present invention resides in a method of forming compound articles,particularly joint is inconspicuous and is re'vented absolutely from opening during t tion of bending.

In the drawings,-Figure 1 is a diagrammatic view illustrating the steps of my method; Fig. 2 is a perspective View, showing details of the process for forming the compound body; Figs. 3,4 and are sectional views 1 taken on lines 3.3, 44 and 55 of Fig.

2; Fig. 6 is a vertical central section through the mechanism employed in carrying. out the method; Fig. 7 is a front view of one of the dies; Fig. 8 is a front elevation of the positioning or guide plate; Fig. 9 is a front elevation of" the drawing die; and Fig. 10 is a sectional view, illustrating a modified form of comp ound'body.

e opera- In general, the method may be said to consist in applying a sheet metal strip or sheathing about the exterior of a channeled core or blank and over the outer side edges ofthe walls, in then folding the blank or core upon itself longitudinally, thereby abutting the marginal clamping t e same between the core sides, and finally reducing the covered core-for the purpose of increasing the clam ing effect exerted by the blank upon the s eathing to prevent the opening of the seam' orjoint upon subsequent bending of the article.

In carrying out the method commercially, I preferably first form'the blank or core and so fashion the same that it will be capable of exerting a maximum clam ing effect upon the sheathing when reduce and this without cutting the abutting portions of the covering. The core I make preferably of soft ortions of the sheathing and iron, and in the form shown in Figs.,3 and 4,

which I find is the bestshape to produce the results desired. It will be seen that the blank, indicated by the reference-letter a, is

ractically' of half-round metal, channeled lbngitudinally as at I), having the tops of its side portions or walls fiat, as indicated at a b, and each top provided with sharp marginal edges 0 (1. Further, the core is of such substance or thickness that it will be capableof being folded longitudinally in the manner described, and subsequently reduced without being crushed.

The strip of covering materialor sheathing c is applied by suitable mechanism hereinafter described to the exterior of the blank, and the strip is preferably of such width that it will extend not only-over the flat to s of the blank sides but artially within the c annel 1). Subsequent y, the blank is folded longitudinally u on it, the flat top portions meeting and c amping therebetween the marginal portions of the covering. The inner marginal edges-d serve to first grip during the folding movement the sheath ng sides, and prevent the same from -sl1 ping until the operation of folding is comp eted. The sharp outer edges 0 are then-inclose proximity, and serve to form a joint of minimum size. Finally, the covered blank passes' tent that subse uent opening of the joint by bending "is abso utely prevented. Further,

the flat meeting portions of the blank, in addition to producing the maximum clamping effect desired, prevent the cuttin of the sheathing during the reducing of the core.

It will be obvious fromthe steps of the method described that the reduction of the core, in addition to increasing the clamping effect of the latter u on the sheathing, also serves to minimize tiie size of the joint, the more tightly the meeting portions of the core are brought together the less conspicuous the' seam. After the covered body has been reduced in the manner described, it is in readiness to be bent into any desired form without sheathing are arranged preferably upon suitable reels, as d and e, in such relation to one another that as the material passes to the dies the sheathingmay be properly applied 3 over the core.

represents the form of die employed for fo ding the sheathing over the core, consisting of upper and lower die plates, indicated by the numerals 10 and 11, suitably secured together by bolts g. The die plates are formed respectively with channels forming a passage, indicated at h, through which the core and covering plate or stri are drawn, the arrangement of the parts be such that as the core and covering pass through the diethe marginal edges of the latter will be bent over the edges of the core and between the meeting faces of the side tops, as illustrated, and the core folded on its lon itudinal axis.

0 produce the additional clamping re-- quired to prevent the seam opemng, the core is passed through a drawing or narrowing die '11 lprovided with an orifice j. The dies may e mounted. upon a suitable bed, as k, which in turn is provided with a flange 1 against which the drawing die '11 engages, said being provided with an orifice 'm through which the completed work is drawn.

Afterwards, the article may be coiled upon a 4 suitable drum or reel indicated at n. The

die f is provided with a positioning or guide plate, indicated at g, constructed with a suitably-she ed channel 1' which serves to make the imtial fold of the marginal edges of the securing strip in starting the stri or cover upon its passage through the ies. The positioning member also serves to keep the Work from vibrating sidewise, and hold the parts so that the core will be exactly the'center of the covering strip.

' It will be readily understood from the ,fore oing description of the method that the finis ed article need' not necessarily be a solid rod or bar, as the'hollow or tubular rod indicated in Fig. 10 can as Well be produced. It is merely essential that the core or blank should be of suflicient substance to permit of its being finally reduced in diameter to obtain the additional clamping effect without its being crushed. It is also to be understood that the form of blank described is the one I preferably emplov, but that it is susceptible of various modifications without in any manner de arting from the spirit of my invention. or instance, the inner edges, as d, may be dispensed With, but I prefer to use the same in orderto obtain the est results. Also, the sheathing need not necessaril extend entirely over the to portions of t e blank or into the channel this is preferable as abetter gripping of the sheathing by the blank or core is obtained.

Attention is further directed to the fact that the sheathing or covering, While in most instances of a metal different-from the core,

but

is not necessarily so, it being immaterial from the standpoint of the invention as to what metal the blank is sheathed With.. What I claim as my invention is,-j

1. The-herein-des'cribed method ofmaking compound metal bodies, consisting in forming a channeled blank, in applying a metal covering strip about the exterior of the blank and, over the blank edges, folding the blank along its longitudinal axis and abutting and clamping the mar 'inal portions of the covering strip, and fina y reducing the covered blank by pressure.

2.. The herein-described method of makin compound metal bodies, consisting informing a blank, in apply' g a .metal covering strip .aboutHthe exterior of theblank an over the blank ed es, folding the blank .along its longitudina axis and abutting and clamping the marginal portions of the coverin strip, and finally reducing-the covered blan by pressure.

In testimony whereof, I have signed this specification in the presence of two 'sub scribing witnesses.

- 1 CARL HELLMICH'.

Witnesses: v

N. S. WRIGHT,

E. SI IELBURG.

Images