Method of making a rubber lined impeller

Claim 1

IN THE METHOD OF FORMING A RUBBER MOLDED CLOSED TYPE IMPELLER HAVING A SKELETON COMPRISING AN ANNULAR RING AND A DISK SPACED THEREFROM BY PLURALITY OF VANE MEMBERS THE STEPS OF: POSITIONING SAID SKELETON IN A TANK MOLD WITH A BLADE CORE BETWEEN EACH VANE MEMBER IN SPACED RELATION THEREFROM AND FROM SAID RING AND SAID DISK, EACH BLADE CORE BEING COMPOSED OF TWO SECTIONS IN CONTACT ALONG A PLANE SUBSTANTIALLY PARALLEL TO THE PLANE TO SAID DISK; INTRODUCING AN AMOUNT OF RUBBER INTO SAID TANK MOLD TO FORM AN INTEGRAL COATING ABOUT SAID SKELETON; CURING SAID RUBBER; LATERALLY WITHDRAWING THE CORE SECTIONS ADJACENT SAID DISK FROM BETWEEN SAID VANE MEMBERS; MOVING THE REMAINING CORE SECTIONS TO THE POSITIONS ORIGINALLY ASSUMED BY THE REMOVED CORE SECTIONS FOR LIKE LATERAL WITHDRAWAL AND LATERALLY WITHDRAWING SAID REMAINING CORE SECTIONS FROM BETWEEN SAID VANE MEMBERS.