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Publication numberUS456376 A
Publication typeGrant
Publication dateJul 21, 1891
Filing dateAug 15, 1890
Publication numberUS 456376 A, US 456376A, US-A-456376, US456376 A, US456376A
InventorsMaurice Delafor
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Maurice delafor
US 456376 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)


y GONDUIT EUR ELECTRIC CABLES. No. 456,376. l PatentedJulyZl, 1891.

. lu l i Mau'r/L'ce elqfor l ,By my@ MMMMM UNITED STATES PATENT OFFICE.-


CONDUIT FOR ELECTRIC CABLESQy SPECIFICATION' forming part 0f Letters Patent N o.' 456,376, dated J' ulyl` 21, 1891.

Application led Allgnt 15, 1890. Serial No. 362,132. (No model.) Patented in France March 29, 1890,

and in Belgium June 4, 1890.

May 30,1890, No. 8,392,

To a, whom, it may concern:

Be it known that I, MAURICE DELAEOE, a citizen of the French Republic, residing at 14 Quai de la Rape, Paris, in the Republic of France, have invented certain new and useful Improvements in Tubes or Oonduits for Electric Cables, (for which I have applied for Letters Patentin Belgium, dated June 4, 1890; in France, dated March 29, 1890, N o. 204,711, and in England, dated May 30, 1890, No. 8,392,) of which the following is a specification.

The conduit herein described is intended to remove the disadvantages inherent in conduits in use hitherto for central'stations for electric lighting or for transmission of motive force.

'Its advantages consist, among others, in' its affording a simple conduit as little cumbersome as possible, easily laid, solid, absolutely tight, having perfect insulation, capable of being' easily inspected, allowing without any diculty of the current being tapped, and of secondary ramifications. The conduit is made of any suitable insulating material, so long as by its composition it allows of the construe# tion and arrangement hereinafter described to be carried out. It allows with advantage and security of naked electric cables being used.

This conduit is operculated, preferably rectangular in shape, having the corners slightly rounded. The upper part iits on the lower part, the joint following a broken line, the shape of which is shown in the drawings and forms a covering com pletelyj oined. This lower part is itted with insulating-supports, which have a longitudinal groove for receiving the cable, a circular iiuting (or neck) for insuring the insulation, and fastening-tenons for insu ring the fixity of the cables. These supports can be fixed or movable. Each conduit, the length of which varies according to requirements, has a male screw at one end and a female screw at the other, so that the conduits may be easily connected with one another.

To overcome absolutely the disadvantages inherent in all subterranean passagesnamely, damp, absorption ofgas, and loss of electricity-the following arrangements are employed.

In the annexed drawings, Figure l is aseo- No. 204,711; in England tion of the conduit; and Fig. 2 is aside view,

part of the exterior covering being removed which the conductor is adapted to be connected in any suitable way so as to hold it firmly and prevent slipping. f f are the grooves in which the cables are placed. c and c are the lateral wallsv of the groove; g, the insulating neck or iiuting. d d is the lower part of the insulator, forming a flange. P is the insulator-foot, which may be primarily made one with the conduit (as is the case with P) or fitted in afterward, as P.

In Fig. 2, A is the lid; B, the bottom or lower part of the conduit; yI and I', the insulating-supports; O, the lateral parts of the groove; e, the attaching-tenen; d, the lower part of the insulator, forming a flange; g, the neck of the insulator; P and P', the feet of the insulator; p, the male screw at the end; p', the female screw at the other end, the upper part forming the lid, which fits on by a broken line (the shape of which is shown as as an illustration in the drawings, Fig. 1, letter m) in place of a straight one. Any other form of broken or curved line so as to avoid a straight one can equally well be employed. The worm at the end is also made inabroken line, like the arrangement, Fig. 2, making the same reservations as in the preceding case, the arrangement of the joint of the lid and the connection of the extremities allowing, if required,a crossing (or breaking) of the joints, which insures a perfect water-tightness by means of any suitable impermeable material, cement, insulating mastic, clay, dsc.

It is stated above that a rectangular form is preferable, but with the suitable insulators, as described before, a circular, oval, or any other form can be used.

I declare that what I claim is- 1. A conduit of suitable insulating material having a removable cover, the joint between the cover and conduit following a broken line, whereby tightness of the conduit TOO is assured, said conduit being also provided with a series of insulators, each having a groove f, an insulating-neck g, anges d d, and a lower support or foot attached to the body of the conduit, substantially as described.

2. As an article of manufact-ure, a conduit composed of sections, each section provided with a removable cover and fitted with insulators made integral with the body ofthe conduit, substantially as described.

3. In a conduit, an insulator for carrying the conductors, said insulator being provided with a groove f, an insulating neck orfluting, as g, flanges cl d, and a lower support or foot attached to the body of the conduit, substantially as described.

4. In a conduit, an insulator for carrying the conductors, said insulator being provided with a groove f, having' lateral Walls 0,2m insulating,` neck or fluting g, anges d d, tenons e, and a lower support or foot attached to the body of the eonduit,substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4228825 *Jan 9, 1979Oct 21, 1980Kabelschlepp Gesellschaft Mit Beschrankter HaftungTransmission line carrier
Cooperative ClassificationF16L7/00