The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1993
Filed:
Sep. 16, 1991
Robert B Barnett, Mobile, AL (US);
Stanley J Wisniewski, Lincroft, NJ (US);
Sea-Land Service, Inc., Edison, NJ (US);
Abstract
An apparatus for securing shore crane spreaders to extension frames is disclosed. The apparatus comprises a plurality of rotatable twist locks installed on the extension frame which mate with lifting fittings located on the crane spreader. These twist locks are all connected together through a linkage system to an actuator located on the extension frame. The actuator consists of a lever, connected to the twist lock linkage and a shaft coupled to the top portion of a torque tube that extends down from the dock. When a stevedore located at dockside rotates the torque tube, the actuator is simultaneously rotated which rotates the twist lock of the extension frame within the fittings of the crane spreader, thereby locking the extension frame to the spreader. By lifting the crane spreader and the extension frame off of the dockside stowage frame, a safety mechanism is automatically activated which prevents the actuator and rotatable twist locks from rotating any further while the spreader/extension frame is handling cargo. Only when the extension frame is supported on the dockside stowage frame are the twist locks freely rotatable.