US459227A - Hydraulic pipe - Google Patents

Description

(No Model.)

A. H. MoILVAIN. HYDRAULIC PIPE.

No. 459,227. Patented Sept. 8, 1891.

UNITED STATES PATENT Clarion..

ALFRED H. AWLICILUIIW, OF PHILADELPHIA, PENNSYLVANIA.

HYDRAULIC PIPE.

SPECIFICATION forming part of Letters Patent No. 459,227', dated September 8, 1895..

Application liled May 8, 1891. Serial No. 392,062. (No model.l

T0 all whom, may concern:

Be it known that I, ALFRED Il. MCILVAIN, a citizen of the United States, and aresident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and usefulImprovements in Hydraulic Pipe; and I do hereby declare that the following is a full, clear, and exact description ot' the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying` drawings, which form a part of this specification, and in which- Figure l is a perspective view of a section of my improved hydraulic pipe. Fig. 2 is a cross-section of the same, and Fig. 3 isaperspective view of the pipe with a portion of its outer covering loosened and turned down at two corners.

Like letters of reference denote corresponding parts in all the figures.

This invention relates to pipe for hydraulic and other purposes of that type which consists practically of two concentric pipes of cement or similar material, each incased in a jacket and one inserted within the other, so as to form a compound pipe, so to speak; and my iml'irovement consistsin thepeculiarconstruction of the outside pipejacket, as will be hereinafter more fully described and claimed.

Referring' to the accompanying' drawings, the letter A designates the inside pipe or conduit proper, which is made of hydraulic cement or its equivalent, and surrounded by a casing or jacket B of sheet iron or othersuitable metal. Around this metallic jacket is molded a concentric pipe C, also of cement or some similar material, and this outside pipe is incased in a jacket D, composed of one or more thicknesses of paper, felt, vulcanized liber, or some other similar flexible substance which is not affected to any appreciable extentbyeither heat or cold. This exterior jacket or covering D has its meeting edges dovetailed, as shown at d, so that the vdovetails along one edge will interlock with the dovetails along the other edge, as illustrated in Fig. l. In this manner the outside jacket is not only made very stron and durable, but it is formed without any projecting seam or rib, being per'- fec-tly smooth and cylindrical and with a close and perfect joint. It desired, two or more rows of rivets c may be driven through the outside jacket into the cement C while the same is yet in-a plastic state, so as to firmly unite the cement pipe C to its jacket or cas-v ing D.

In practice I prefer to coat the insidejacket B with a thin layer of coal-tar, paint, or varnish for the twofold purpose of preserving it from rust and causing the better adhesion to itof the cement, which does not adhere well to smooth sheet-iron. Similarly, the outside jacket or envelope D is coated or painted with a layer of some suitable varnish or composition which is impervious to water, or the material from which this outside jacket or envelope is made may be impregnated with asphalt, coal-tar, or some similar protective composition. i

I am aware that it is not new to construct a hydraulic pipe consisting of two concentric metallic shells with an inside cement lining and intermediate solid filling, as described and claimed in the patent to Daniel G. Phipps, No. 227,830, dated May 18, 1880; but. I have found by experience that the alternate expansion and contraction ofthe outside sheet-metal pipe due to heat in summer and frost in winter will soon crack and disintegrate the intermediate filling, causing it to crumble, and thus sooner or later rendering it useless. This I etliectuallyavoidby makingthisoutside jacket or casing of some elastic material which is not affected by changes in the temperature, thereby adding greatly to the lite and eiciency of the pipe.

Having thus described my improvement, I claim and desire to secure by Letters Patent of the United Statesl. As an improvement in hydraulic pipe, the herein-described compound pipe comprising the inside cement pipe or conduit A, having metallic jacket B, in combination with the outside casing-pipe C, of cement or similar material, having a jacketD ort` one or more layers of paper, felt, or analogous material not appreciably affected by changes in the temperature, substantially as an d for the purpose shown and set forth.

2. In a compound pipe of the described construction, the outside waterproof jacket or Io vided with rivets c, projecting` through the jacket into the casing-pipe, substantially as and for the purpose shown and set forth.

In testimony that I claim the foregoing as my oWnI have hereunto affixed my signature in presence of two Witnesses.

ALFRED H. MCILVAIN. Vtnesses:

J No. W. BOILEAU, W. G. RoLTs.

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