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:
Apr. 19, 2016
Filed:
May. 16, 2012
Makoto Sugaya, Narita, JP;
Takeshi Takahashi, Tsukuba, JP;
Takayuki Shimodaira, Ryugasaki, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
An arm of a hydraulic excavator is formed as a box-shaped structural body surrounded by left and right side plates, an upper plate, a lower plate, and a thick rear plate. An upper end of the thick rear plate is protruded upward from an outer surface of the upper plate. Upper ends of a pair of arm cylinder brackets joined to an outer surface of the thick rear plate are arranged higher than the outer surface of the rear thick upper plate and lower than the upper end of the thick rear plate. As a result, in each of the arm cylinder brackets, a joint area with the thick rear plate can be ensured large, and joint strength can be improved.