Shrinkable sleeve adapted for cable and tubing gas flow blocking

Claim 1

A compact one-piece shrinkable sleeve made from a recoverable material having an elastic memory and in an expanded state is able to be securea to the end of an electrical cable and/or tubing bundle having one or more conductors and/or tubes extending from the end thereof to provide a barrier of minimal outside dimension to the flow of gas or vapors through the bundle, said sleeve in the expanaed state having an opening disposed at one end thereof that is adapted to permit insertion of the end of the bundle into a cavity disposed within the sleeve communicating with said opening, said cavity enclosed by the wall of the sleeve and in said expanded state adapted to receive the end of the bundle and having a length thereof extending along the length of the sleeve that is sufficient to insure the securement of the sleeve to the bunale; one or more channels disposed internally within the sleeve that extend along the length thereof between the cavity and the end of the sleeve opposite to said end into which the bundle is inserted, said channels having an opening at one end thereof communicating with the cavity and an opening at said opposite end, said channels enclosed by walls of the sleeve that are integrally related directly or indirectly with the wall forming the remainder of the sleeve, said channels in the expanded state adapted to receive the conductors and/or tubes from the cavity in the combinations thereof desired and having sufficient length to permit the conductors and/or tubes to extend therethrougn and emerge from the opening thereof at said opposite ena; and said sleeve dimensionally adapted such that when the sleeve is caused to shrink from said expanaea state onto the end of the bundle the cavity wall is able to contract against the outer surface of the bundle to secure the engagement therebetween and the channel walls are able to constrict against the outer surface of the conductors and/or tubes contained therein to provioe a barrier to the flow of gas and vapors through the bundle.