Sealed wall lead-through means for cables in particular for junction boxes

Claim 1

In a fluid-tight wall lead-through packing and gland assembly for cables more particularly for the connection of electric cables within a hole in a wall of a junction box, comprising a bushing having a threaded portion securable within said hole and advanceable axially therewithin, said bushing terminating at one of its axial ends in circumferentially spaced and axially extending teeth radially tiltable with respect to said threaded portion, each of said teeth forming a lever one free end of which projects radially outwardly of the surface of said bushing, an annular collar adapted to axially abut the wall and positionable coaxially and externally of and about said one axial end of said bushing and comprising circumferentially spaced longitudinal cuts provided on a portion of the inner surface of said collar, said cuts being positioned and dimensioned to receive corresponding teeth of said bushing, one end of each said cut forming an abutment for bearing engagement by the free end of the corresponding tooth of said bushing, and an annular deformable sealing packing positionable concentrically about said cable and having a medial portion entering said one axial end of said bushing and a radially outer portion engaging with said annular collar; thereby said teeth are radially inwardly pivotable upon engagement of said teeth with said abutment and engagement of said collar with the wall in response to axial advancement of said bushing into the hole so as to deform said sealing packing into sealing engagement with the outer surface of the cable.