Mold

Claim 1

A MOLD FOR CASTING A HOLLOW CYLINDRICAL THIN WALLED BODY WHICH COMPRISES: BOTTOM WALL MEANS, OUTER WALL MEANS HAVING AN AXIAL CYLINDRICAL BORE AND BEING SUPPORTED BY SAID BOTTOM WALL MEANS,M INNER WALL MEANS ARRANGED WITHIN AND IN RADIALLY SPACAED RELATIONSHIPO TO SAID OUTER WALL MEANS AND SUPPORTED BY SAID BOTTOM WALL MEANS, SAID INNER WALL MEANS BEING WITHDRAWABLE FROM SAID OUTER WALL MEANS AND TOGETHER WITH SAID OUTER WALL MEANS AND SAID BOTTOM WALL MEANS CONFINING AN ANNULAR CHAMBER FOR RECEIVING CASTABLE MATERIAL, SAID OUTER WALL MEANS COMPRISING A FIRST MEMBER FORMING THE MAJOR PORTION OF SAID OUTER WALL MEANS AND PROVIDED WITH A HEAD RADIALLY OUTWARDLY EXTENDING FLANGE MEANS, BOLT MEANS MOUNTED IN SAID FLANGE MEANS AND PROVIDED WITH A HEAD SPACED FROM SAID FLANGE MEANS IN A DIRECTION AWAY FROM SAID BOTTOM WALL MEANS, SAID OUTER WALL MEANS ALSO COMPRISING A SECOND WALL MEMBER DETACHABLY MOUNTED ON THAT END FACAE OF SAID FIRST WALL MEMBER WHICH IS REMOTE FROM SAID BOTTOM WALL MEANS, SAID SECOND MEMBER BEING PROVIDED WITH SLOT MEANS REGISTERING WITH SAID BOLT MEANS AND HAVING A FIRST PORTION LATER IN DIAMETER THAN THE HEAD OF SAID BOLT MEANS, AND ALSO HAVING A SECOND PORTION NARROWER THAN THE HEAD OF SAID BOLT MEANS WHEREBY SAID SECOND MEMBER WHEN ROTATED INTO A FIRST POSITION IS LOCKABLE TO SAID FIRST MEMBER AND WHEN ROTATED INTO A SECOND POSITION IS DETACHABLE FROM SAID FIRST MEMBER, SAID SECOND MEMBER HAVING CUTOUT MEANS CONFINING WITH THE ADJACENT END FACE OF SAID FIRST MEMBER RECESS MEANS COMMUNICATING WITH THE ANNULAR CHAMBER BETWEEN SAID FIRST MEMBER AND SAID INNER WALL MEANS.