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:
Sep. 04, 1990
Filed:
Jun. 29, 1989
Yukio Koizumi, Akashi, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Abstract
In a crane capable of folding a strut type jib along a vertical side surface of a boom and also capable of stretching the jib from such a folded condition in a so-called twisting fashion, a jib stretching and folding device includes a twist shaft for jib stretching and folding operation located below a lower member of the jib under the jib folded condition, so as to fold the jib at an upper position aside the boom. Furthermore, the twist shaft is movable toward and away from the forward end of the boom, so as to fold the jib at a position shifted to the base end of the boom. The advance condition of the twist shaft to the forward end of the boom can be fixed so as to prevent movement of the jib to the forward end of the boom.