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:
Jul. 07, 2009
Filed:
Jul. 06, 2004
Nozomu Tanaka, Tsuchiura, JP;
Yasuo Koide, Niihari-gun, JP;
Hiroyuki Isobe, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A swivel frame structure for a hydraulic excavator, said swing frame structure being to be arranged in a swing upperstructure, has a center framecomposed of side platesand a reinforcement platejoined to each other. The swing frame structure is provided with mating portions for bringing the side platesand the reinforcement plateinto engagement with each other. These mating portions comprise plug-in structure portions, which in turn comprise holesformed through the respective side platesand lugsarranged on opposite side edge portions of the reinforcement plateand to be inserted into the holesof the corresponding side plates. The center frame can be fabricated without needing any jigs for fixedly holding the side plates and a bottom plate together.