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. 27, 1983
Filed:
Jul. 02, 1980
John L Hockensmith, Chambersburg, PA (US);
JLG Industries Inc., McConnellsburg, PA (US);
Abstract
A multi-section telescopic lifting boom which is extended and retracted at least in part by chains having their ends secured to one section, engaging sprockets carried by another section and connected at an intermediate point to a third section. Telescopic elements which are completely separated during boom extension are provided with inclined guide surfaces to insure entry of the smaller element into the surrounding element. Extension and retraction is effected by a linear hydraulic motor connected to a cylinder box which is pivoted to section adjacent the the base section; anti-friction pads are carried at the bottom of the outer end of the cylinder box and engage longitudinally extending tubes on the bottom plate of the next section, the tubes extending higher than the extension and retraction chains, which are positioned between the tubes. The chains are provided in parallel, at least one end of each chain being connected to a yoke which is adjustably secured by a threaded member.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile