Patent ID: 6651961
Filing Date: 2003-11-25
Classification: B66C,B66D

Abstract:
A multiple block system for a hoisting device for a load, comprising:a boom head sheaving; said boom head sheaving oriented generally above an upper rigging unit and a lower rigging unit; said upper rigging unit oriented generally above said lower rigging unit; an upper load block set; said upper load block set having an upper load block upper sheaving and an upper load block lower sheaving; said upper rigging unit comprising said upper load block upper sheaving, at least one upper load line and an upper reeving line termination point; each said upper load line reeving around said boom head sheaving and said upper load block upper sheaving, attaching to said upper reeving line termination point and attaching to an upper load line winch; a lower load block having lower load block sheaving; said lower rigging unit comprising said upper load block lower sheaving, at least one lower load line and a lower reeving line termination point; each said lower load line reeving around said boom head sheaving, said lower load block sheaving and said upper load block lower sheaving, attaching to said lower reeving line termination point and attaching to a lower load line winch; said upper load line operable independently of said lower load line; and said lower load line operable independently of said upper load line.