US1064432A - Flexible metallic tubing. - Google Patents

Description

W. BERRYMAN &"A. REDGRAVE. FLEXIBLE METALLIC TUBING. APPLICATION FILED DBO. 24, 1910.

1,064,432,, Patented June 10,1913

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Specification of Letters Patent.

Patented June 10,1913.

- To all whom 2'5 may concern:

Be it known that we, WILIJAM BERRYMAN, engineer, and ARTHUR RnncnAvE, engineer, 'both subjects of the of Great Britain, both residing at The United Flexible Metal- 110 Tubing Company Limited,'Penders End, in the county of hfid'dlesex, England, have jointly inventedcertain new andusefuhlmprovements' in Flexible Metallic Tubing, of which the following is a specification.

Flexible metallic tubing is manufactured byyhelically coiling a strip of metal corrugated in various forms but in such a man nor that the successive convolutions, when to or in the course of the coiling of the tube such a manner thatwhen coiled there are one or more additional channeled convolutions-provided between the actual convolutions the edges of which serve to interlock the coiled strip, in forming the additional convolutions of a shape similar to that of the interlocking convolutions, and in parallelism therewith.

In the accompanying drawings Figure,:, l is a sectional view of the spirally wound tube showing one such additional convolution and Fig. 2 a snnllar' View showing a plurality of such additional convolutions.

Hitherto such tubing has. been manufactured from a strip of metal corrugated so that ,it consists of two channels a and 5 turned in opposite directions, the one channel a having its convex side toward the exterior of the tube and the other channel Z).

.liayifig its concave side toward the exterior. This strip being spirallywound, the outer edge-a otthe next" convolution is laid in the channel 1).. A strip or band'c' of packing material such as india rubber is also wound at the same time with tllfifitl'll), the said packing being inclosed between the two adjac'ent overlapping edges o f themetal strip,

thus forming a tight joiiit, while at the same time giving a certain flixibility to the tube.

The present invention consists in so corrugating thestrip, that in addition to the interlocking convolutions there are one or more additional channeled convolutions such as one at (Fig. 1) or two outer convolutions d, d and two inner convolutions d (Fig.

that the greater width of strip employed causes a greater length of tube to be formed with each coiling, thus expediti g the'manufacture while the intermediate corrugations preserve the strength. In addition to this, packing is necessary only at greater distances apart, thus lessening the quantity required, sothat the cost 'of manufacture is considerably reduced. f

Although the invention is shown. as applied to one particular formation of strip for boiling a tube, it {is equally applicable toemany other fermationsof strips used for manufacturing flexible metallic tubing in which the coils are interlocked. Having thus described the nature of th said invention and the best 'means we know of carrying the sameinto' practical efiect, we claim V 1. A flexible metal tubing consisting of a metal strip helically coiled to form a series edge, andan outwardly directed and simi: larly shaped channel on the other edge parallel with the first channel, so that the ehan neled edges of two adjoining convolutions of the strip interlock, each convolution also having an inwardly directed channel'and an outwardly directed channel between the interlocking channels and parallel th e-' with, and a packing stri seated in the interlocking channels; so stantially as described. w 7 b l 2..A flexible metallic tubing, consisting of of convolutions, saidastriphaving an inwardly directed channel formed on one larly shaped channel on the other edge pan allel with thefirstlchannel, so that the Chenneled edges of two-adjoining convolutions having a plurality: of inwardly directed 2) or there may beanore. 1 It will be seen 7 a metal strip helically coiledto-form a series of convolutions, said strip having -an inwardly di'rected channel formed on one edge, and an" outwardly directed-and simis otthe. strip interlock,each-convolution also g emme channels ancla plurality of cutwei'dlly dinames to this specification in the'presence meted channels of similar shape in the in: of two subscribmg Witnesses. terloching channels and parallel therewith,

Y WILLIAM BERRYN .the last mentioned channels bemg located 5 between the interlocking channels, and & ARTHUR BEDGRAVE' packing strip seated in the interlocking Witnesses: channels; substantially as described. JOSEPH MILLARD,

. In testimony whereof we have signed our WALTER J. SKERTEN.

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