US1661835A - Method of forming mexible tubing - Google Patents

Description

March 6, 1928.

- ATTORNEYS.

II-IIIIIIIII-IIIIIIIIII-IIIIIIIII II-IIIIIIIII-III"UNI-HUN!!! v H. KELLER METHOD OF FORMING FLEXIBLE TUBING Filed April 9, 1927 III=IIIIIIIIII IIIIIII-IIIIIII IIIIIIII-IIIIIII Patented Mar. 6 192 UNITED STATES HEBMANNVKELLER, on HILTON, NEW JERSEY. Assmnon 'ro nons'rivnn CHAIN CORPO- RATION, or mvrne'ron, new JE SEY/A. oonronerron on new JERSEY.

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Applicationfiled April 9, 1927. Serial in. 182,325.

This invention relates to a method of forming a flexible tube from a plurality of helic'ally Wound strips of material and hasfor its object to provide amethod by which 6 tl eco'ils are spaced apart by an intermediatefilling strip and this strip removed after the coils are formed. p I I v A' further object of the invention is the use of a filling strip to support the coils against pressure for operations on the surc face of the outer coils to enhance the appearc Figure 2 is a fragmentalsection showing the finished tube.

Figure 31s a -fragmental sectionshowing the intermediate. filling strip as interposed pbetween'thefouter and inner coils before the same has beenremoved.

' -Figure 4 is a side elevationrshowing the plurality of strips placed sideby side upon an arborito form a tube of difle're'nt appean ance. A r v f Figure 5' is a sectional view illustrating the tube as being [drawn through die to cause the outer surface to have, a uniform ap- Peamnce- Figure 6 is afsectional endview of the tub- ]ingflatte'ned. I

Figure 7 is a sectional fragmental view of the coilsafter being pressed on theirouter surfaces for ornamentation. 1

Figure 8 is a View similar to Figurel7 with the intermediate filling strip removed.

, Figure 9-is a.perspectiveviewof.thefilling strip. 1 Figure 10 is, aperspective, fragmental viewof the fillingstrip located in one of the channel stripsfl'; I c 7 a It is found incpractice in. the makingof helical tubing for ornamental purposes such as bracelets, chokers and the like desirable to a make the same extremely flexible and, at the same time ornament the outer surface of the router 0011s by pressmgrecesses therein and in order to'accomplish these results, I have.

la d a stamp ofv aI-ummum or some material these and other objectsin view, the

different from the inner and outer coils in the channels of the strips of either the inner or outer coils to support the coils during the operations thereon and then chemically remove thisfilling strip by dissolving it to leave a greater space between the coils for I. increasingtheir flexibility; and the follow ing' is a detailed description of the present .method by which these advantageous results maybe accomplished: I p

Vlhth reference to thc drawings, 10 designates the outerstrip and 11 the inner strip of material, each channelshaped' in cross i section with the flanges 12 of two adjacent outer strips lying within the channel between the flanges 13 of one of the inner coils and with a filling strip l'disposed in the channel ofthe inner strip to support the outer strip. The construction illustratedin Figures 2 and 3 consists of a single inner strip and asingle outer strip wound into helical formation one about the other over an arbor such as 15 with thefianges in the inner strip. extending outwardly andfthe flangeson the outer strip extending inwardly and straddling the point between adja- J cent coils of the inner strip, by a process well known, however, I have added in the channel of one of these coils a filling strip '14v illustrated in Figure 3 in the inner coil,

which provides a supportcfor the outer coil so that its outer surface which may be roughened or uneven, as illustrated'at 16 in Figure 5 may besmoothed by drawing the same throughv a suitable die 17 and at the same time this drawing operation may cause Ya change in the shape of the vtube from round to elliptical as illustrated at 18 in Figure 6, it being necessary that the outer coils should be supported by the filling strip in order that the change inshape', illustrated at 1.8, may be formed.

In someinstances, it is desirable to ornaw ment the outer strip 10 which I maydo only when the-filling strip is used vby pressing re- V cesses 19 in its outer surfaceasillustrated in Figure 7 which may offthemselves be of an ornamental configuration. to enhancethe appearance of the bracelet or which may receive further ornamentation such asgems or the like After the drawing operation and ornamental formations are completed the filling strip 14- having served its usefulness is then removed from between the inner and outer coils by chemically disno I i solving it 7 The filling strip is of amaterial different from the inner and outer coils, aluflanges of the outer strips and inner strips 11 to allow greater freedom of the coils and flexibility of the tube when in use.

In some cases a plurality of strips for the inner and outer coils may be wound simultaneously about the arbor 1511s illustrated in Figure l. A pair of strips Ql and 22 each having a filling 14 of difierent material, are woundas a pair simultaneously to form the inner coils and a pair of strips 23 and 24 having different outer surfaces are wound simultaneously side by side about the inner coil to form the outer coil of the tube each of the strips being channel shaped with their inwardly extending flanges on the outer coil interlocked with r the outwardly extending flanges on the inner coil to limit the closing movement of the coils with relation toeach other. V c

It will be seen from the foregoing process that I have provided a method by which :certain operations to increase the ornamental appearance of the tube may-be performed after which the filling strip necessary in order that such operations may be performed is removed .to increase the flexibility of the bracelet which is also an improved and desirable result in the finished product. Having thus described one illustrative embodiment of my invention and the best mode known to me for carrying out my method, I desire it to be understood that although specific terms are employed, they are used in a generic and descriptive sense and not for the purpose of limitation, the scope of the invention being defined and limited only by the terms of theappended claims.

Iclaim: V 1. A method of forming an ornamental tubing, which consists in windinga plurality of channel-shaped strips of metal into helical coils one upon theothcr with the inwardly-extending side flanges of each outer coil extending intothe channels between outwardly extending side flanges of adjacent inner coils and at the same time winding into helical form a filling strip of a diflerent material than that of the inner and outer coils and positioned inthe channels of one of them, and then removing the filling strip after the coils are formed. 7

2. A method of forming an ornamental tubing, which consists in winding a plurality of channel-shaped strips of metal into helical coils one upon the other with the in wardly-extending side flanges of each outer coilextending into the channels between outwardly extending side flanges of adjacent inner coils, and at the same time winding into helical form a separate strip of a material difierent than the material of either inner or outer 0011s and posltioned in the channels of the inner co1l 'when wound, drawing -:the tube when wound through a die to 'into helical coils one upon the other with the inwardly-extending side flanges of each outer coil extending into the channels be tween outwardly-extendinge side flanges of adjacent inner coils, and at the same time winding into helical form a separate strip of a material different than the material of either the inneror outer coils and positioned in the channels of the inner coil when wound, drawing the tube when wound through a die to smooth the outer surface, pressing the outer surface of the outer coils for ornamentation and then removing the filling strip.

4. A method of forming an ornamental tubing, which consists in winding a plurality of channel-shaped strips of metal into helical coils one upon the other'with theinwardly-ext'ending side flanges of each outer coil extending into the channels between outwardly extending side flanges of adjacent inner coils and at the same time'winding into helical form, a separate strip of a material difi'erent'than the material of either inner or outercoils the strip being positioned in the 7 channels of the inner coil when wound, pressing the outer surface of the outer coils for ornamentation and then removing the filling strip.

5. A method of forming an ornamental tubing, which consists in winding a plurality of channel-shaped strips of metal'i'nto helical coils one upon the other with thehinwardly-extending side flanges of each outer coil extending into the channels between outwardly extending side flanges of adjacent inner coils and at the same time winding into helical form a filling strip of a difierent material than that of the inner and :outer coils and positioned in the channels of one of them, and then dissolving the filling strip after the coils are formed.

outer surface of the outer coils for ornamen= 115 6.'A method offorming an ornamental I tation and then dissolvingthe filling strip tubin which consists in winding a plurality 0 channel-shaped strips of metal into helical coils one upon the other with the inwardly-extending side flanges of each outer coil extending into the channels between outwardly extending side fianges of adjacent 10 inner coils, and at the same time winding into helical form a separate strip of a material 'difierent'than the material of either inner or outer coils the strip being positioned in the cha-nnels of the inner coil when wound, drawing the-tube when wound through a die to smooth the'outer surface and change the shape of the tube from cylindrical, and then removingthe filling strip. v I

- In testimony whereof I afiix my signature.

HERMANN KELLER.

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