US 1781574 A
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1930. o. A. FREDERICKSON PROTECTED ARMORED CABLE OR CONDUIT Filed Oct. 18. 1928 awvwnboz 01gb zdwlcm a E a g 5 3 rfffflll'fl Patented Nov. 11, 1930 UNITED STATES PATENT OFFICE OTTO A. FREDERICKSON, OF BEN AVON, PENNSYLVANIA, ASSIGNOR TO NATIONAL ELECTRIC PRODUCTS CORPORATION, DELAWARE OF NEW YORK, N. Y., A CORPORATION OF PROTECTED ARMORED CABLE OR COND'UIT Application filed October 18, 1928. Serial No. 313,204.
This invention relates to improvements in armored cable and corrosion resisting protecting coverings therefor.
At the present time armored cable is large- 1y employed in electrical wiring installations. Frequently, such cable is used in places where corrosive fumes or liquids are present such as in packing houses or the like. In such cases these fumes or liquids corrode and eat into the metal armor and this in time not only produces an unsightly condition, but also may even wholly eat the armor away rendering it liable to breakage, etc. Furthermore, the corroded surface of such cable detracts from making proper ground connections to the armor itself.
It is accordingly, one of the objects of this a protective covering which is corrosion resisting and which is particularly adapted to guard the armor against the attacks of corrosive substances such as corrosive gases or liquids.
It is a further object of the present invention to provide a protective covering for armored cable of such nature that the protective covering may be readily cut from the armor leaving underneath a clean surface which is adapted for forming a good electrical connection with outlet boxes or other fittings.
It is a further object of the present invention to provide a protective covering for an armored cable which can be removed and which after removal requires no scraping of the armor to establish a clean surface condition of the armor.
Other objects and advantages of the present invention will be hereinafter set forth in the accompanying specification and claims and shown in the drawings, which by way of illustration show what I now consider to be a preferred embodiment of the invention.
In the drawings, 7
Figure 1 shows a partly broken away View of an armored conduit incorporating my improved protecting covering.
Fig. 2 shows the protecting covering cut and folded back and indicates that a clean surface is left upon the armored cable or conduit.
Fig. 3 is a detail view of one end of the conduit like Fig. 1, but with a different form of wire cable disposed therein.
In the drawings, 10 designates a flexible armored metallic conduit. Disposed over this conduit there is first wrapped a wrapping or serving of fibrous material 11. Preferably this material is transversely crumpled paper. 12 designates a braided, woven 01' knitted jacket which is disposed outside of the serving 11. After this jacket is applied, the cable is placed in a saturator and the braided wrapping is saturated with asphaltic material 13. This material penetrates and fills the inter- I stices of the wrappings and also penetrates invention to provide an armored cable with into the outer pores of the serving or wrapping 11. The penetration does not, however, extend to the metallic armor 10 itself, being prevented from reaching this metallic surface by the paper or fibrous wrapping 11. After the asphaltic saturation is carried out there is a further saturation or covering with a layer of sterine pitch 14 and eventually this sterine pitch layer 14 is covered over with a non-sticker composition 15. The resulting article will be of such characterthat the metallic armor 10 is completely protected from the action of corrosive substances by a flexible covering. The outer surface of the metal of the armor will be maintained clean and uncorroded at all times and if it is desired to cut off a section of the protecting corrosion resisting covering this can be done in the 1 manner indicated in Fig. 2. It will be found that the paper serving or wrapping keeps the impregnating material away from contact with the metal surface of the armor and the protecting wrapping can be merely folded back whereupon an attachment could be made to the armor without any preliminary cleaning of the surface of the armor.
It will be understood that the final article can be used as armored conduit per se or if desired it can be marketed with conductor wires already disposed therein as shown in the drawings.
In Fig. 1, 16 represents the metallic conductors which are suitably insulated with insulation 17. If desired, over these insulations portions 17 there can be a paper wrapping 18. When it is desired to provide a finished end for one end of the cable the paper \vrappings 18 can be unwrapped back a short distance within the armor 10, then torn ofl' as shown in Fig. 1 and afterwards a suitable bushing 19 can be placed in position within the end of the flexible armored conduit.
Fig. 3 shows an alternative embodiment wherein the paper wrapping 18 is omitted. It will be obvious, however, that the cable can be marketed without any wires in position therein and that such wires can be afterwards drawn into the cable or conduit by the user. By the employment of the corrosion resisting flexible covering the armored cable will be protected against the effects of corrosion, and use may be made of such flexible conduit in places where such conduits heretofore could not be used on account of the corrosive effects of liquids or gases in the atmosphere.
Furthermore, the covering is flexible and permits the conduit to be curved'and bend as desired. The non-sticker finish coat also is advantageous as it obviates a tacky condition of the outside of the cable.
What I claim is: 4
1. A flexible metallic armored 'cable for electrical wiring uses provided with a wrapping of transversely crumpled paper therearound disposed directly upon the flexible metallic armored conduit, an outer protecting covering disposed directly upon and about said transversely crumpled paper wrapping having impregnating compounds therein which penetrate the interstices of the covering and outer pores and outer surfaces of the transversely crumpled paper wrapping but which are prevented from access to the flexible metallic armor by said transversely crumpled paper wrapping so that the protecting covering may be removed leaving a clean surface upon the armor.
2. A new article of manufacture comprising a metallic armored flexible conduit, a wrapping of transversely crumpled paper thereover, a jacket over said transversely crumpled paper wrappmg with insulating and corrosion resisting compounds saturated and impregnated therein, a further sterine pitch covering-over said impregnated jacket and a. non-sticker material over said pitch layer for the purpose described.
3. A new article of manufacture comprising a metallic armored flexible conduit, a transversely crumpled paper wrapping thereover to maintain a clean surface upon the armor and to prevent the access of impregnating compound thereto, a jacket saturated and impregnated with asphaltic material over said transversely crumpled paper wrapping with the asphaltic material penetrating only to the outer pores and surfaces of the transversely crumpled paper wrappings and kept away from the metallic conduit by said wrappings whereby the covering for the armored conduit may readily be removed leaving a clean and exposed surface of the metal of the conduit.
4. An armored flexible spiral conduit provided with a flexible covering thereon including a jacket saturated with corrosion resisting material to protect the armor against the effects of corrosion, and including within said jacket and directly abutting the armor a supplemental fibrous jacket of transversely crumpled paper which is adapted to prevent the permeation of the saturating ma terial to the armor itself whereby cleaning of the surface of the armor upon removal of portions of the covering may be obviated.
5. A covered armored metallic conduit having a spiral metallic member portion and a composite covering therefor and thereover, said composite covering including a serving of transversely crumpled paper laid directly over the surface of the metallic armor and another covering jacket disposed directly over said serving and saturated with a corrosion resisting saturating compound, said serving of transversely crumpled paper maintaining the surface of the metallic armor clean and preventing access thereto of the saturating compounds which would otherwise adhere to the metal and provide an unclean surface thereupon and render removal of the covering difficult.
6. An armored flexible metallic conduitprovided with a flexible outer covering comprising an asphalt saturated jacket covered over with stearine pitch and with a final covering of non-sticker material, said covering for the armor including a serving of transversely crumpled paper laid directly over the surface of the metallic armor for maintaining said surface clean and for preventing access thereto of the saturating compounds which would otherwise adhere to the metal and provide an unclean surface thereupon and render the removal of the cover difficult;
In testimony whereof I hereto aflix my signature.
OTTO A. FREDERICKSON.-