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Dec. 11, 41945. ‘c. ‘E. BENNETT 2,390,823 APPARATUs FOR IMPREGNATING ELECTRIC POWER CABLES Filed Dec. 31,‘ 1940 INVENTOR . J E,‘ .3‘ ATTORNEYS I . 2,390,823 Patented Dec. 11, 1945 UNITED STATESVPATENT OFFICE _ APPARATUS FOR IIVIPREGNATING ELECTRIC - POWER CABLES ' Charles E. Bennett, Ridgewood, N. J., assignor to The Okonite-Callender Cable Company, Incor porated, Paterson, N. 1., a. corporation of New Jersey > Application December 31, 1940, Serial No. 372,695 ' 1 Claim. This invention relates to’ a process and an ap paratus for use in connection'with the impreg nating of electric power cables, that is to say, cables composed of~one or more conductors in sulated with oil permeable material such as paper, (01. 91-46) I8 and I8 which extend toward and terminate just beneath the outer ends of the stuffing boxes l0. Each end of the conduits l6 and I8 con veniently is provided with a cup 20. for example,- the invention having for its object the provision of equipment and. method whereby ‘ While the cable may be sheathed‘ any time after being superimpregnated, I prefer to super impregnate and sheathe the cable in a contin uous operation. For this reason, therefore, the pressure chamber 8 at its discharge end is con quence a more thorough impregnation of the cable is obtained than is possible by the methods 10 nected by a ?exible metal pipe 22 to a lead press 24. The press 24 has merely been illustrated employed up to the time of this invention. diagrammatically inasmuchvas the same con In one aspect of my invention, the same in stitutes no part of this invention and inasmuch volves impregnating the cable initially in the as the presses for sheathing cables are well, usual way and thereafter, and before the appli cation of the sheath thereto, the'cable is sub 15 known by those skilled in this art. The ?exible connection 22 between the chamjected to another impregnating step, although it her 8 and lead press permits of a certain amount is to be understood that the invention compre of movement of the press with respect to the hends superimpregnating a dry cable. pressure chamber. ‘ Equipment for the practice of my invention Before the process is started in operation the 20 may take various forms. conduits l4, l6 and I8 as well as the pressure In the accompanying drawing 1 have illus cylinder 8 are charged with the insulating fluid trated one type of equipment which I have 9. This ?uid will be an oil similar to the oils found suitable for the practice of my invention. employed in impregnating electric power cables. Referring to the drawing in detail: 2 desig nates a reel of cable. For the purposes of illus 25 I prefer that it be slightly heated and degasi?ed. As the cable is drawn continuously through the tration I have simply shown a single conductor pressure cylinder it will be subjected to super cable. This cable on the reel 2 comprises a con impregnation because of the fact that the oil 9 ductor 4 and oil permeable insulation 6, which is under pressure. Inasmuch as the intake con may be the usual paper tape, for example. This cable may be dry or it may have been 30 duits I6 and i8 terminate just beneath the outer‘ ends of the stu?‘lng boxes l0 it will be appre impregnated in the usual way by methods usually ciated that any oil which passes the cable at employed in this art and familiar to all skilled the stumng boxes drips into the cups 2!] to be in the electric power cable industry. ‘As above returned to the system so that the stu?ing boxes mentioned, it is an object of this invention to Ill need not be a tight ?t on the insulation 6 superimpregnate this cable. Accordingly the of the cable even though the oil in the cylinder cable is drawn off the reel Zand passed con 8 is under high pressure, and danger of injury tinuously into and through a pressure cylinder 8. to this paper or other material employed for in This cylinder is of steel or any other suitable sulating the cable is avoided. material capable of withstanding high pressures. The pressures which I intend to employ may vary 40 Inasmuch as the cable ‘always projects from the ends of the'pressure cylinder, it will be ap from say thirty pounds to the square inch to sev parent that the pressure on the cable due to the eral thousand pounds. pressure ?uid 9 will be exerted radially of the The pressure cylinder 8 is provided at each cable so that the oil will be driven into the in end with a stu?lng box III, the cable being led the cable is superimpregnated and as a conse through these stu?ing boxes. As will be brought 45 sulation and into the conductor itself to insure. that evenvthe minutest spaces within the cable [out more in detail hereinafter, these stu?ing will be ?lled with oil thereby producing a super boxes in are not a tight ?t about the cable in-v impregnated or thoroughly impregnated cable. sulation despite the fact that the pressure cyl As the superimpregnated cable passes into the inder 8 is to be maintained ?lled with an insu lating ?uid under the pressures above mentioned. 50 lead press 24 the lead sheath 2B is applied thereto l2 designates a pressure pump, the discharge side of which is connected by a conduit M to in the usual manner, all in a continuous opera tion. ' ' . the interior of the pressure cylinder 8, approxi mately midway ‘of the length of the cylinder. At It will be seen from all of the foregoing that my invention provides an improved method and the intake side of the pump .1 provide conduits 55 apparatus for use in the manufacture of im- n ' v 2,890,828 . . pregnated electric power cables wherein the cable is subjected continuously to superimpreg to! a previously oil impregnated papcr’insulated ' nation in order that the minutest spaces in the ' a pressure cylinder containing oil, a pump for cable will be-iilled with oil, as above mentioned, and the operating characteristics oi’ the cable improved. ‘It is to be understod that changes may be made in the details oi’ construction and arrangement of parts so far as the apparatus illustrated and described herein is concerned without departing , ' from the spirit and scope of my invention. What I claim is: An apparatus for the further impregnating cable, said apparatus comprising in combination maintaining this oil under superatmospheric pressure, stu?ling boxes at the ends or the cyl inder through which the cable, is continuously ted lengthwise with the ends oi.’ the cable pro iecting from the ends oi! the cylinder, and intake conduits’ for the pump terminating at said stu? 0 ing boxes whereby any pressure oil passing the stumng boxes willbe returned to the pressure’ cylinder. CHARLES vIlil. BENNETT.