Patent ID: 7370570

Claim:
A fluid pressure cylinder comprising: a case main body in which a reciprocating rod is mounted so as to be reciprocable in a forward direction and a backward direction; a first lock unit including a first lock sleeve with a taper surface whose diameter is large toward a tip portion of the reciprocating rod, the first lock sleeve being mounted axially movably in the case main body, a first retainer holding a fastening member engaged with the taper surface and fitted axially movably in the reciprocating rod, and a first spring member applying a spring force to the first lock sleeve toward a rear end portion of the reciprocating rod; a second lock unit including a second lock sleeve with a taper surface whose diameter is large toward the rear end portion of the reciprocating rod, the second lock sleeve being mounted axially movably in the case main body, a second retainer holding a fastening member engaged with the taper surface and fitted axially movably in the reciprocating rod, and a second spring member applying a spring force to the second lock sleeve toward the tip portion of the reciprocating rod; a driving cylinder attached to the case main body, containing axially movably a driving piston provided with a rear end of the reciprocating rod, and having a advance pressure chamber and a retreat pressure chamber; and a fastening cylinder attached to the case main body and containing a fastening rod so as to be reciprocable in a fastening direction and a fastening release direction, a fastening surface contacting with respective inclined surfaces formed on the first and second lock sleeves so as to face to each other being formed on the fastening rod, wherein the fastening rod causes the first and second lock sleeves to move in reverse directions and fixes the reciprocating rod by the first and second lock units.