Double-lock cable and flexible conduit gland

A double-lock cable and flexible conduit gland for securing a cable, or, a cable and a flexible conduit, to a box member, comprising:

• a shell, said shell having an axial through hole surrounded by an inside wall thereof, a tapered inner surface formed on the inside wall of said shell and an inner thread formed on the inside wall of said shell;
• a collar inserted in said shell, said collar having an axial through hole, a beveled outer end edge suspending outside the axial through hole of said collar and stoppable against the tapered inner surface of said shell and a protruding inner stop portion suspending inside the axial through hole of said collar;
• a packing ring inserted through the axial through hole of said collar and compressible by said collar to hold down the inserted cable or the insertable flexible conduit and cable, said packing ring having a first packing ring segment, a second packing ring segment axially formed integral with one end of said first packing ring segment and an axial through hole surrounded by said first packing ring segment and said second packing ring segment for the insertion of a cable, or a flexible conduit and a cable in the flexible conduit, said second packing ring segment defining a tapered outer surface, said first packing ring segment having an outside annular groove extending around the periphery thereof for receiving the protruding inner stop portions of said collar;
• and
• a connection ring sleeved onto said collar and said packing ring and connectable between said shell and the box member, said connection ring having a tapered inner surface formed on an inside wall thereof and stopped against the tapered outer surface of said packing ring and a first outer thread extending around the periphery thereof and threaded into the inner thread of said shell.