Pipe casting apparatus having vibrating means in physically separated adjacency to the core

Claim 1

A SYSTEM FOR CASTING HOLLOW CONCRETE MEMBERS, COMPRISING A HOLLOW TUBULAR MOLDING STRUCTURE FOR CONFINING A CONCRETE MIXTURE IN PLASTIC CONDITION IN ITS INTERIOR AND HAVING SUFFICIENT ELASTICITY TO WITHSTAND VIBRATION IMPACTS WITHOUT SUBSTANTIAL DEFORMATION, MEANS IN PHYSICALLY SEPARATED ADJACENCY TO THE TUBULAR MEMBER AND HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED CONTACTING SURFACES FOR DIRECTING IMPACT FORCES AGAINST THE INNER CONFINING SURFACE OF THE STRUCTURE THROUGHOUT ITS LENGTHWISE AND CIRCUMFERENTIAL EXTENT IN A CYCLIC ACTION PRODUCING BENDING MOVEMENTS IN SAID SURFACE, AND MEANS FOR INITIATING SAID FORCES FROM AN INDEPENDENTLY-SUPPORTED SOURCE AT A FREQUENCY AND AMPLITUDE MAINTAINING VIBRATING COMPACTION ON THE CONFINED PLASTIC MATERIAL DURING THE CYCLIC ACTION.

Claim 2

A SYSTEM FOR CASTING HOLLOW CONCRETE MEMBERS, COMPRISING A HOLLOW TUBULAR MOLDING STRUCTURE FOR CONFINING A CONCRETE MIXTURE IN PLASTIC CONDITION IN ITS INTERIOR AND HAVING SUFFICIENT ELASTICITY TO WITHSTAND VIBRATION IMPACTS WITHOUT SUBSTANTIAL DEFORMATION, MEANS IN PHYSICALLY SEPARATED ADJACENCY TO THE TUBULAR MEMBER AND HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED CONTACTING SURFACES FOR DIRECTING IMPACT FORCES AGAINST THE INNER CONFINING SURFACE OF THE STRUCTURE THROUGHOUT ITS LENGTHWISE AND CIRCUMFERENTIAL EXTENT IN A CYCLIC ACTION PRODUCING BENDING MOVEMENTS IN SAID SURFACE, AND MEANS FOR INITIATING SAID FORCES FROM AN INDEPENDENTLY-SUPPORTED SOURCE AT A FREQUENCY AND AMPLITUDE MAINTAINING VIBRATING COMPACTION ON THE CONFINED PLASTIC MATERIAL DURING THE CYCLIC ACTION.