US1474949A

US1474949A - Flexible tubing

Info

Publication number: US1474949A
Application number: US364295A
Authority: US
Inventors: Sundh August
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-12-20
Filing date: 1919-12-20
Publication date: 1923-11-20
Anticipated expiration: 1940-11-20

Description

NOV. 20, 1923.

A. SUNDH FLEXI BLE TUBING Filed Dec. 20 1919 INVENTOR AT ORNEYS- Patented Nov. Zfl, F1923.

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AUGUST SUNDH, 01F HASTINGS-ON-HUDiSON, YORK.

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Apol'lcation filed. December 20, 1919. Serial No. 364,29t5.

To all whom it may concern: Be it known that 1, AUGUST SUNDH, a citi- '--zen of the United States, and a resident of Hastings-on-Hudson, in the county of Westch'ester and State of New York, have invented certain new and useful Improvements in Flexible Tubing, of which the following 'is a specification.

My invention relates to flexible, metallic tubing constructed of corrugated, metal strips helically wound to form a corrugated, flexible, metallic tube.

In the, present invention I have provided an inner, metallic member comprising a helically wound, corrugated, metal strip which when wound forms a metal tube having inwardly and outwardly extending loops. ll envelop this member in a helically wound, metal strip which when wound also forms a corrugated tube having inwardly and outl. wardly extending loops. The adjacent edges of the strips are attached to each other by solder which may be fused as the tubing is.

being formed or applied in any other suitable way, and also the loops of thetwo membars are secured to each other at all points by solder or other fusible, metallic binder. In the accompanying drawings, Fig. 1 is a part sectional elevation of an embodiment of my invention;

Fig. 2 is an enlarged, sectional, elevational view of the tubing of Fig. 1; and

Fig. 3 shows diagrammatically a modifi-.

cation of the tubing of Figs. 1 and 2. Referring to the drawings in detail, 1 designates ,3. corrugated, metal strip helically wound to -form inwardly extending,

loops 2 and outwardly extending loops 3. Enveloping the strip'l is a helically wound, metal strip 4, this strip be ng corrugated and wound to fotm outwardly extending loops 5 and inwardly extending loops 6.

The adjacent edges of the helically woundstrip 1 approach each other at the point 7 which is beneath the base of the inwardly extending loops 6 of the outer strip 4. The adjacent edges of the outer strip approach each other at the point 8, immediately above the outwardly extending loops 3 of the inner member. The inwardly and outwardly extending loops of the two members 1 and 4 are shaped so as to conform to each other and are secured to each other at'every point by a fusible,metallic binder 9 such assolder fused during the forming of the tube, this binder c'tioning not only to secure the two strips to, each other but also to secure the adjacent edges of each strip to each other at the points 7 and 8.

Other methods of securing these strips to each other may be employed such as, for example, .coating the surfaces of each strip to be joined with solder, then bringing the two strips together and applying heat to fuse the solder, thereby securely joining the two strips to each other at all points to form a unitary flexible tubing.

In the embodiment of my invention illus trated in Fig. 3 l have shown diagrammatically a. flexible tubing comprising an inner flexible, metallic strip 10 helically wound to form inwardly and outwardly extending loops 11 and 12, respectively. This strip 10 is enveloped by a helically wound, metal strip 13 having inwardly and outwardly ex tending loops 14: and 15, respectively. En-

veloping the strips 11 and 13 is a helically wound, metal strip 16 having inwardly extending loops 1'? and outwardly extending loops 18. The inwardly and outwardly extending loops of all three members are secured to each other at all points by a fusible, metallic binder such as solder as in the case of the tubing of Fig. 1. llt will be noticed that the adjacent edges of the inner strip 11 approach each other at the point 19; the adjacent edges of the strip 13 approach each other at the point 20' which is in a different part of theloops of the tubing as a whole; and that the adjacent edges of the strip 16 app-roach each other at the point 20 at the base of the inwardly extending loops. @In other words, the pointsof approach of the adjacent edges ofthe strips are staggered so as not to weaken the tubmg. I

It'will be seen from the foregoing that I have provided what may be considered as a double-walled, flexible, metallic tubing, the corrugations or inwardly and outwardly extending loops of each wall being secured to each other at all points by means of fusible, metallic binder whereby leakage of the tubing, due to leaky joints, is eliminated, the flexibility of the tubing, however, being maintained.

I am aware that flexible tubing has been made by merely corrugating a metal tube or vmetallic binder for securing the loops of both members to each other extending to all points of theloops.

What I claim asnew is:

1. The method of making a flexible II18-' tallic tubing consisting in helically winding a corrugated metal strip to form a tube having inwardly and outwardly extending loops, Winding a second corrugated metal strip about the first strip so as to bring the inwardly and outwardly extending loops of the one strip in register with the similar loops of the other strip to form a double walled tube, and permanently and rigidly uniting the face of the inner strip to the a jacent overlying face of the outer strip throughout their entirety.

2. A flexible metallic tubing comprising navaeie a metal tube composed of a helically wound corrugated metallic strip surrounded by a corrugated metal strip wound helically so that the loops thereof register with the loops formed by the corrugations on the inner tube, the two strips being permanently united to each other throughout their entire length. v

3. A flexible, metallic tubing comprising a corrugated metal strip helically wound to form inwardly and outwardly extending loops, the adjacent edges of said strip approaching each other at the base of the inwardly extending loops, a helically wound, corrugated, metal strip enveloping thefirstnamed strip and having inwardly and outwardly extending loops, the adjacent edges of the enveloping strip approaching each other at the base of the outwardly extending loops of said strip, and a fusible binder between adjacent edges of both strips and between the walls of th inner member and the enveloping member'for binding the two metal strips to each other at all points and to prevent separation of the adjacent edges of each strip.

This specification signed this 17 day of December, 1919.

AUGUST SUNDH.