|Publication number||US434748 A|
|Publication date||Aug 19, 1890|
|Filing date||Apr 24, 1890|
|Publication number||US 434748 A, US 434748A, US-A-434748, US434748 A, US434748A|
|Inventors||Thomas R. Almond|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (12)|
|External Links: USPTO, USPTO Assignment, Espacenet|
T. R. ALMOND.
No. 434,748. Patented Aug. 19, 1890.
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UNITED STATES- PATENT OFFICE.
THOMAS R. ALMOND, OF NEW YORK, N. Y.
srncrrron'rron forming part of Letters Patent No.'4s4,74s, dated; August 19,1890.
Application filed April 24, 1890. Serial No. 349, 3- (No model) To all whom it may concern:
Be it known that I, THOMAS R. ALMOND, a resident of the city, county, and State of New York, have invented an Improved Flexible Tube, of which the following is a specification.
This invention relates to improvements on the flexible tube for which Letters Patent of the United States No. 4243M: were granted to me March 25, 1890.
The invention consists, mainly,in combininga coil of triangular cross-section with an inner coil, between the convolutions of which the triangular windings of the outer coil are forced, all ashereinafter more fully described.
The invention also consists in concaving the faces of said triangular coil; also in combining therewith peculiar shapes of the innercoil, as hereinafter specified.
In the drawings, Figure 1 represents a longitudinal central section of a flexible tube made according to this invention, showing it on a mandrel; Fig. 2 is a similar View on a a larger scale of said tube partly in face view. Figs. 3, 4, and 5 are sectional diagrams showing different forms of parts.
In my Letters Patent No. 424,0il, I show a flexible tube composed mainly of two coils of wire, one of which is placed around a man- (1 rel, the other being forced into the interstices between the convolutions of the first coil, so as finally to enter between the convolutions of the first coil and reach contact with the mandrel. This arrangement is departed from in the present instance in thatI use an outer coil A of triangular cross-section,which outer coil I force between the convolutions of the inner coil D while the same bears on the mandrel B, so that thus the tapering or wedgelike edges of the outer coil A will serve to at all times keep the convolutions of the inner coil D under tension, seeking to spread them apart, where otherwise they would tend to approach one another. By imparting to the outer coil A this triangular formI obtain the additional advantage of securing a larger contact-face than is obtained by the cylindrical wire shown in my former patent and of insuring a more perfect closure while the flexible pipe is bent.
The triangle of the outer coil A may be equilateral and straightsided, as in Fig. 4.; but I much prefer to make the contact-faces a a, which butt against the coil D, of concave form, the curvature being on a circle of which the center lies in the axis of the mandrel B. This curved or concaved triangle in contact with the inner coil D is shown in Fig. 3 and has the advantage of giving a still greatercontact-face and of producinga tighter joint when the tube is bent; but Fig. 5 shows a stillbetter form in that the inner coil D has contact-faces b on the same curve as the contact-faces a of the concave triangles A.
One way of making this improved tube is to first place around a mandrelB the coil D and then to force between the convolutions of that coil the triangular coil A, so that the wedge-like convolutions of this coil A will enter between the convolutions of the coil D, tending to spread them apart, and insuring therefore a tight joint, which will be maintained tight even when the tube is bent to a reasonable degree. 7 In using the tube the mandrel is of course removed.
lVhat I claim, and desire to secure by Letters Patent, is- A 1. The flexible tube composed of an inner coil combined with the outer coil A, of triangular cross-section. whose convolutions are in* terposed between the convolutions of the inner coil, substantially as herein shown and described.
2. The flexible tube composed of the inner coil D, combined with the outer coil A, of trlangular cross-section, having concave faces a, the coil D having curved faces I) corresponding'to the concave faces a of the coil A, the convolutions of the coil A being interposed between the convolutions of the coil D, so that the concave faces a a are in contact with the convex-faces Z2, substantially as herein shown and described.
THOMAS E. ALMOND.
HARRY M. TURK, LIVINGSTON EMERY.
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