Bonded metallic cable sheathing with edge forming
AssigneeEssex Group, Inc.
InventorsRusty L. Ramsey, Frederick M. Zinser, III
Life of this patent
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Abstract
A cable shielding system is disclosed wherein corrugated metal shielding has its edges bent to a predetermined configuration prior to being formed about the cable. Upon being formed around the cable, the sheathing with the pre-bent edges forms a closed passage way within the seam for receiving an adhesive. The pre-bent edge configuration reduces the possibility that the edge of the metallic sheathing will damage an externally applied plastic sheath.
Claims20
In the method of producing shielded cable of the type having a longitudinally seamed corrugated metal sheath overlaid with a bonded extruded plastic sheath the improvement which comprises:
- prior to encasing said cable with said corrugated metal sheath, preforming the edges of said corrugated metal sheath precursor strip so that upon the formation of the metal sheath, the longitudinal sheath seam includes a closed longitudinal recess adapted to receive an adhesive bonding agent, said recess being effective in containing said adhesive and said seam having a minimal tendency towards notch formation when the plastic sheath is applied.
A metal strip preform for forming a metal sheath about a cable, said preform having a longitudinal direction, being corrugated in the transverse direction and said preform having both longitudinally extending edges bend so that they cooperate to form a longitudinally extending recess when the metal strip having the preform is applied to the cable.
A shielded cable comprising:
- at least one transmission means;
- a metallic sheath means having preformed edges for enclosing said transmission means, said edges being preformed prior to said metallic sheath means enclosing said transmission means;
- a longitudinal seam formed by the junction of said edges, said seam including a closed longitudinal recess for receiving and retaining an adhesive means therein, said recess being formed by the cooperation of said preformed edges;
- adhesive means, operatively inserted into said recess between said preformed edges, for bonding said edges together;
- and
- a non-metallic sheath means, operatively connected to said metallic sheath means, for providing electrical insulation and water proofing, said seam having a minimal tendency towards notch formation when said non-metallic sheath mean is operatively connected to said metallic sheath means.
The shielded cable of claim 6 wherein a first edge forming said recess in said metallic sheath means is bent at an angle of at least 30 degrees.
A method for producing a shielded cable comprising the steps of:
- providing at least one set of wire means;
- enclosing the wire means in an insulation means;
- providing metallic sheath means;
- preforming the edges of said metallic sheath means;
- surrounding said wire means with said metallic sheath means having said preformed edges;
- joining said preformed edges to form a closed longitudinal recess for receiving and effectively containing an adhesive means;
- and
- extruding plastic sheath means over said metallic sheath means so that said wire means and said metallic sheath means are enclosed by said plastic sheath means.
A shielded cable comprising:
- transmission means;
- insulation mean surrounding said transmission means;
- a corrugated metal sheath for enclosing said transmission means, said metal sheath further comprising:
- a first preformed edge bent at an angle of at least 30 degrees;
- and
- a second preformed edge first bent at an angle of at least 15 degrees in the same direction as said firt edge and then bent at an angle of at least approximately 15 degrees in the reverse direction, said first and said second edges forming a longtitudinal metal sheath seam having a closed longitudinal recess for effectively containing an adhesive means therein;
- adhesive means, operatively inserted into said recess, for bonding said edges together;
- and
- outer sheath means, extruded about said metal sheath, for providing electrical insulatinn and waterproofing.
Dependencies are inferred from the claim text.