Patent ID: 6502569
Filing Date: 2003-01-07
Classification: B28D

Abstract:
A rock splitter of oil hydraulic piston type which comprises a housing having a plurality of cylinder chambers formed on the upper portion and the first and second paths communicates with the cylinder chambers for supplying and discharging oil; a piston inserted into the chamber of the housing, the piston rising and falling depending on the inflow of oil; and a cap being capable of a vertical movement, the cap being connected to the upper surface of the housing, in such a manner that the inner surface thereof is in contact with the upper surface of the housing, the cap moving vertically depending on the movement of the piston,wherein the rock splitter further comprises: a cylinder detachably mounted inside the cylinder chamber of the housing in a sealing state; a collapsible member having a locking member detachably mounted in the cylinder chamber of the lower end of the piston, a plurality of members capable of a vertical extension, which are connected inside the locking member, inner and outer circumferences of the members having a gap for flowing oil, and an elastic member supporting the lower end of the central member of the members and providing the elasticity to contacting the upper end of the member to the lower surface of the piston; and a plurality of stepped portions formed on the inner and outer circumferences of the members, each upper or lower surface of the stepped portion being in close contact with each lower surface or upper surface thereof to stop the gaps between the members and to prevent the flow of oil when the collapsible member spreads completely.