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:
Oct. 22, 2019
Filed:
Jun. 30, 2016
Shanghai Yangtze 3-map Elevator Co., Ltd., Shanghai, CN;
Zhiyong Yang, Shanghai, CN;
SHANGHAI YANGTZE 3-MAP ELEVATOR CO., LTD., Shanghai, CN;
Abstract
A middle-drive type elevator has a lift car, tractor, wire rope, guide pulley and counterweight device. The tractor is installed between the lift car and guide pulley. Both the tractor and guide pulley are disposed above the lift car. The tractor is located below the guide pulley. One end of the wire rope connects to the top of the counterweight device, and the other end connects to the top of the lift car after passing through the guide pulley and a traction wheel on the tractor successively. To make the tractor arranged in the middle, the guide pulley bears the majority of the weight of the lift car and counterweight device, while the tractor only bears the minority of the weight of the lift car and counterweight device. It can effectively reduce the load borne by the tractor and greatly improve the service life of the tractor.