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. 29, 2019
Filed:
Nov. 17, 2016
Crrc Qingdao Sifang Co., Ltd., Qingdao, Shandong, CN;
Buzhao Niu, Shandong, CN;
Jinghai Jiao, Shandong, CN;
Xinkai Fang, Shandong, CN;
Donghua Wu, Shandong, CN;
Guidong Tao, Shandong, CN;
Guimei Deng, Shandong, CN;
CRRC QINGDAO SIFANG CO., LTD., Qingdao, Shandong, CN;
Abstract
An interlocking control device for a multiple-unit safety circuit is provided, which includes: a protective grounding switch control branch which includes: a pantograph rising pneumatic circuit cut-off valve, a protective grounding switch turn-off pneumatic circuit cut-off valve and a protective grounding switch turn-off solenoid valve which are connected in series. When high-voltage equipment of a multiple-unit train is under maintenance or is powered by an external power supply, a protective grounding switch is turned on, cocks of the pantograph rising pneumatic circuit cut-off valve and the protective grounding switch turn-off pneumatic circuit cut-off valve are rotated to open a cover of a key box, the protective grounding switch control branch is disconnected, the protective grounding switch turn-off solenoid valve connected in series in the protective grounding switch control branch is powered off to maintain the protective grounding switch in an on state.