Patent ID: 7363848

Claim:
Rotating or pivoting device comprising: a housing; at least one working piston disposed in said housing; means for loading said working piston with a pressurized medium; a pivoting member mounted for rotation in said housing; a coupling mechanism cooperating with said working piston and said pivoting member to enable said working piston to rotatably drive said pivoting member; a cylinder mounted in said housing, said working piston being displaceably mounted in said cylinder; abutment means cooperating with said housing and with said working piston to limit a stroke of said working piston at at least two positions; means for locking said abutment means, independent of said working piston, in at least an axially inner, intermediate position; an axially displaceable locking piston cooperating with and mounted within said abutment means; spring means cooperating with said locking piston; and means for loading said locking piston with pressure in opposition to said spring means and in said intermediate position of said abutment means to displace said locking piston to lock said abutment means in a locking position thereof.