US781353A - Conduit for electric wires. - Google Patents

Description

No. 781,353. PATENTBDJAN.31,.1905.'.

. s. PALMER.

GONDUIT FOR ELECTRIC WIRES.

APPLIGA'TIOR FILED no'v. 1'1, 1993.

I I l/VfE/VTOR- 44 $4M Allorriey UNIT D STATES;

Patented January 31, 1905.

PATENT OFFICE.

STEPHEN PALMER, OF TROY, NEW YORK, ASSIGNOR TO MARCUS M. WATERMAN, JAMES K. P. PINE, JAMES J CHILD, HERBERT E. NORTHRUP, AND GEORGE W. DAW, OF TROY, NEW YORK.

CONDUIT FOR ELECTRIC WIRES.

SPECIFICATION forming part of Letters Patent No. 781,353, dated January 31, 1905. Application filed November 17, 1903. Serial No. 181,539.

To all whom, it may concern: I

Be it known that I, STEPHEN PALMER, of

Troy, in the county of Renss'elaer andfState of New York, have invented certain new and useful Improvements in Conduits for Electric 'Wires; and-VI do hereby declare the following to be a full, clear, and exact description of the invention, suchas will enable others tain novel features of construction and combinations and arrangements of parts, as will' be more fully hereinafter described, and pointed out in the claim. y

In the accompanying drawings, Figure 1 is a View in cross-section, illustrating my improvements. Fig. 2 is a View in longitudinal section, and Fig. 3 illustrates the inner fabric tube with my improved open braiding thereon.

1 represents an inner tube of woven fabric fireproofed in any approved manner and having an inner coating 2 of refractory materialsuch, for instance, as asbestos,mica, and the like. The tube 1 is formedfrom astrip I curved longitudinally to bring its longitudinal edges together, and while in such position my improved open braiding 3 is located around the same. Awaterproof adhesive material 4:such, for example, as asphaltum-is then applied over open braiding 3, and it will be observed the braiding 3 not only serves to hold the edges of fabric 1 together and the fabric 'in cylindrical form, but also provides a great number of openings, into which the adhesive I material 4 (which is applied in a plastic conand it will be understood that the tube can be built up to any desired thickness by applying "alternatelayers of fabric 5 and fire and waterproof material 6 until the desired thickness is produced.

By constructing a conduit as above described a tube of great textile strength is produced, one which owing primarily to the longitudinal disposition of the threads of the inner woven fabric 1 cannot stretch longitudinally. vThe open braiding 3 insures a tube of perfect formation and one in which the several coatings are securely locked into "The conduit is fireproof, waterproof, and sufficiently flexible to perform all the necessary functions of a device of this character.

Slight changes might be made in the general form and arrangement of the severalparts described without departing from my invention, and hence Ido not restrict myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

As a new article of manufacture, a conduit for electric wires, comprising an inner tube of woven fireproofed'fabric having an inner coating of refractory material, an open braiding inclosing said fabric tube, waterproof adhesive material inclosin g said open braiding and entering the interstices thereof, a closelywoven braided fabric inclosing said adhesive material, and a coating of adhesive material inclosing said closely-woven braided fabric. In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' STEPHEN PALMER. Witnesses:

S. W. FosTER, S. G. NOTTINGHAM.

practically one integral mass.

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