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:
Mar. 01, 2016
Filed:
Feb. 12, 2013
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Toshikazu Minoshima, Ushiku, JP;
Yuusuke Shibue, Noda, JP;
Yohei Nakate, Tsuchiura, JP;
Takanobu Ikari, Tsuchiura, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
Front wheels (L,R) a steering operation of which is possible by a steering mechanism () are mounted on a vehicle body (). Steering cylinders (L,R) of the steering mechanism () extend and contract in response to an operation of a steering handle () provided in a cab () to perform the steering operation of the front wheels (L,R). The steering mechanism () is provided with a rotation angle sensor () for detecting a steering angle θ of the left front wheel (L) and a proximity switch () for detecting whether or not the front wheel (L) is in a straight-ahead state. A controller () determines that the rotation angle sensor () or the proximity switch () is abnormal when the steering angle (θ) detected by the rotation angle sensor () is different from the detection result by the proximity switch ().