US1478185A - Flexible tubing - Google Patents

Description

Dec. 18, 1923.

A. SUNDH FLEXIBLE TUBING Filed Dec. 20, 1919 INVENTOR BYl d m62 ATT RNEYS;

Patented Dec. E8, 1923. v

NETE@ STATES AUGUST SUNDH, 0F la Lamas TINGS-ON-HUDSON, NEW YORK.

I FLEXIBLE TUBING.

Application led December To all cello-m 'it may concern.

Be it known that I, AUGUST SUNDH, a

citizen of the United States, residing at- Hastings-on-Hudson, in the county of Westchester and Stateof New York, have invented certain new and useful Improvements in Flexible Tubing, of which the following is a specification.

My invention relates to an improvement in flexible. metallic tubing and it is an object thereof to provide a tube which will be easy to manufact-ure, one which will withstand high. internal pressures. and oner which may be easily repaired.

Briefly, the present invention comprises a flexible.y metallic tubing made up of a helically wound, corrugated, metallic strip surrounding a corrugated. metallic tube. the adjacent edges of the metallic strip being brought in proximity to each other ata point above the corrugations of the interior, metallic tube and heldI in place Eby a column oflsolder, which solder at the same time functions as a reinforcement for the tubing..

Referring to the accompanying drawings, wherein embodiments of my invention are illustrated,

Fig. 1 is a part sectional elevation of one form of my metallic tube;

Fig. 2 is an enlarged section of the tubing of Fig. 1.

eferring to the drawings in detail, 1 designates. as a whole. a corrugated. metal strip helically wound to form inwardly and outwardly extending 4loops 2 and 3, respectively. nveloped' or surrounded by the helically wound. metal strip 1 is an inner, corrugated. metal tube 4f, the adjacent edges 5 and 6 of the corrugated. metal strip be' ing brought in proximity to each other at a point above the corrugations 7 of the metal tube l. From Figs. 1 and Q it will be seen that the adjacent edges 5 and 6 of the nletal strip l form in part the-inwardly turned loops :2 of the tube. the adjacent edges 5 and 6 of the metal strip, however. being' separated from each other a short distance and the space between'these'edges being filled with a fusible. metallic -binder S. such as solder. This solder functions as a binder to prevent separation of the edges and 6 of the strip 1 and also to bind the strip 1 to the corrugations '7 of the tube 4, the solder also functionin as a reinforcing element for the inwar y turned loops 20, 1919. Serial No. 346,294.

of the tubing. The solder, as shown in Figs. 1 and 2, passes from the upper surface vof the adjacent edges 5 and'v 6 of the metallic strip 1 between the same at 9 and between the vmetallic strip and the corrugations 'a' .-of the tube 4, as designated atY 10. The solder gradually tapers outwardly from the bottom of the inwardly turned loops so as to cause the flexibility of the loops to progreively increase outwardly in order that thererwill be no danger of fracture of the tubing at the edge of the binder.

It will be seen, therefore, thatl have provided a flexible, metallic tubing wherein the outwardly turned loops 3 thereof are free to impart the desired flexibility to the tubing as a whole, and one wherein the inwardly turned loops 2 are more or less rigid at the bottom thereof by reason of the fusible, metallic binder 8 and the corrugated, metal tube 4, so that as a whole the tubing,

`while posseing thedesired flexibility, will at th same time successfully withstand high, internal pressures.

It will be seen also that the fusible binder 8 employed inthis construction tapers gradually to each side thereof so that the flexing ofthe inwardly turned loops or corrugations of the tubing will progressively increase from the bottom of the inwardly turned loops instead of taking place merely v at the junction of the binder and the walls of the loops.

It will be obvious also that in the event of rupture of the tubing at the inwardly turned loops. the same is accessible and may be easily repaired.

lWhat I claim as new is:

A flexible tubing` comprisinga corrugated. metal tube, a helically wound, corrugated, metal strip surrounding the same and forming inwardly and outwardly extending loops, adjacent edges of the strip approaching each other at a point above the corru- ^gations of said tube. and a fusible, metallic binder for preventing retraction of the edges of the strip and for bindingsaid edges of the metal tube. said fusible binder tapering outwardly from the base of the said inwardly turned loops to impart a grad-i AUGUST SUNDH. y

specification signed this 15 day of y

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