Cable gland for use with unarmored electrical cables
OwnerFranz Lackingerinventor
Life of this patent
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Abstract
A flame-proof cable gland for use with an unarmored electrical cable having a sheath providing a tensile strength and wherein a flame-proofing seal and a clamping ring are provided for co-operation with the outer surface of an electrical cable passing therethrough. The hardnesses of the flame-proofing seal and the clamping ring are selected so that, upon axial compression of both of them to cause them to bulge into contact with the outer sheath of an electrical cable, the flame-proofing seal is rendered operative first followed by the clamping ring.
Claims14
An electrical cable gland comprising a pair of tubular body members defining a passage for an electrical cable therethrough, means on one of the body members for connecting the gland to an electrical connection box, a portion of said passageway having an enlarged internal diameter and receiving within said portion at least one tubular flame-proofing seal adapted to be compressed axially by relative movement between the two body members to cause the seal to be urged radially inwardly into firm contact with the outer sheath of a cable passing therethrough in use;
- a deformable clamping ring also located within said portion of the passage and adapted likewise to be compressed axially to cause it to clamp radially inwardly onto another portion of the outer sheath of an electrical cable passing therethrough, the tubular flame-proofing seal being appreciably softer than the clamping ring to ensure effective flame-proofing of the gland prior to function of the clamping ring upon movement of the two body parts towards each other to shorten the effective length of the said enlarged portion of the passage therethrough, and an intermediate axially movable member located between the flame-proofing seal and clamping ring, the intermediate member being held captive by, but rotatable relative to, one of the body members.
Dependencies are inferred from the claim text.