LONG-STROKE HYDRAULIC MECHANISM Russian patent published in 1999 - IPC

FIELD: mechanical engineering; delivery of core to and extracting it from moulding machine; other industries where long-stroke power mechanisms are required. SUBSTANCE: mechanism has power cylinder with outer cover and hollow plunger installed for axial movement on one of supports, plunger extreme positions fixing mechanism, fixed supports, hollow stepped rod one end of which is secured on outer cover of power cylinder and the other is installed for axial displacement in other support, crossmember installed on outer end face of hollow plunger at side of support. Mechanism is made in form of double-acting plunger cylinder. Outer hollow plunger is installed for axial displacement on two supports inside fixed housing of cylinders-sleeves, ends of outer hollow plunger being simultaneously single-acting plungers, and movable supports of fixed housing of cylinders-sleeves are made in form of single-acting plungers. Power cylinder with outer cover and hollow plunger, hollow stepped rod and crossmember are arranged axially inside outer hollow plunger. EFFECT: simplified design and manufacturability. 3 dwg