Crane with self-raising mast

US6695158B2 · kind B2 · utility

Assignee

• Manitowoc Crane Companies, LLC · US

Inventors

• John N. Taylor · St. Louis Park, US
• Arthur G. Zuehlke · Manitowoc, US

Key dates

• Filing date: Feb 4, 2002
• Grant date: Feb 24, 2004
• Expiry date: Feb 4, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66C23/82
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An apparatus and method of self-raising a mast for a crane having an upper works rotatably mounted on a lower works and a boom pivotally mounted on the upper works, the boom being supported by boom hoist rigging and a mast pivotally connected to the upper works. The crane further includes a self-raising mast assembly for controlling the position of the mast when the mast is not connected to the boom and is not supportable by the boom hoist rigging. The self-raising mast assembly comprises a mast raising yoke pivotally connected to the upper works, a hydraulic mast raise cylinder pivotally connected between the upper works and the mast raising yoke, and a hydraulic system for controlling the mast raise cylinder.