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:
Oct. 11, 1977
Filed:
May. 27, 1976
Lyle B Jensen, Cedar Rapids, IA (US);
C Wayne Powers, Cedar Rapids, IA (US);
FMC Corporation, San Jose, CA (US);
Abstract
An extensible boom has a base section that is pivotally connected to a machinery platform and at least one section that is movable axially relative to the base section. A cable system is provided for extending and for retracting the movable sections. The boom sections can be jammed together in either an extended position or a retracted position to resist compression axially of the boom, and to resist bending transversely of the longitudinal axis of the boom in a generally vertical plane. A live mast is offset from the base end of the boom in a vertical plane. Boom carrying ropes extend between the distal end of the base section and the live mast, while a boom pendant extends between the live mast and the distal end of the tip section of the boom. Support of the boom can be transferred by alternately tensioning and slackening the boom carrying ropes and the boom pendant. The boom is supported by the boom carrying ropes during traveling, unpinning, extension, retraction, and pinning of the boom sections, while the boom is supported by the boom pendant when the boom sections have been pinned together and are ready for supporting loads with the boom.