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:
Jan. 24, 2023
Filed:
Jul. 04, 2019
Applicant:
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 8/04 (2006.01); H02H 3/32 (2006.01); H01H 3/02 (2006.01); B60W 50/00 (2006.01); H01H 83/16 (2006.01); H02H 1/00 (2006.01); H02H 3/04 (2006.01);
U.S. Cl.
CPC ...
H01H 3/022 (2013.01); B60W 50/0098 (2013.01); H01H 83/16 (2013.01); H02H 1/0061 (2013.01); H02H 3/042 (2013.01);
Abstract
A safety switch input diagnosis device includes a circuit formed from a series connection of an emergency stop switch and a line having a resistor. A connection state of the emergency stop switch and failure modes of the lines are diagnosed on the basis of a voltage value at one end of the circuit. Consequently, an operation of the switch and failure modes of a circuit relating to the switch can be diagnosed.