Protective sheath for cable

A protective sheath for cable comprising:

• a series of casings coupled in series with one another, each casing comprising a first end formed thereon, a second end formed thereon and located opposite to the first end, and a neck portion disposed between the first end and the second end;
• the first end having a recess defined therein, the recess having an inner surface formed in a concave shape, a groove defined in a bottom of the recess;
• the second end having an outer surface formed in an approximately spherical shape, the recess having an inner diameter being equal to or greater than an outer diameter of the second end for correspondingly receiving the second end of the adjacent casing;
• the neck portion having an outer diameter being less than the outer diameter of the second end;
• a passageway an axially defined therein and extending from a bottom of the groove to the second end for communicating the first end with the second end, an inner diameter of the passageway near the recess being less than an inner diameter of the passageway near the second end, the passageway located near the second end having an inner surface outwardly formed into a flared shape;
• and
• a washer disposed in the groove and having a through hole defined therein for communicating with the passageway, the through hole having an inner diameter being less than an inner diameter of the passageway, the washer being flexible;
• wherein the second end of each casing is completely and swivelably inserted into the recess of the first end of the adjacent casing, the neck portion of each casing partially received in the recess of the first end of the adjacent casing, the casings coupled to one another and forming a continuously series-connected protective sheath for admitting a cable, the cable passing through the through hole of each washer to be gripped and protected by each washer elastic cushion.