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. 23, 2012
Filed:
Mar. 05, 2007
Xiang Shi, Jiangsu, CN;
Yu Gu, Jiangsu, CN;
Wenping Liu, Jiangsu, CN;
Guannan Xu, Jiangsu, CN;
Baogang Chen, Jiangsu, CN;
Bangrong NI, Jiangsu, CN;
Xiang Shi, Jiangsu, CN;
Yu Gu, Jiangsu, CN;
Wenping Liu, Jiangsu, CN;
Guannan Xu, Jiangsu, CN;
Baogang Chen, Jiangsu, CN;
Bangrong Ni, Jiangsu, CN;
Nanjing Kangni Mechanical & Electrical Co., Ltd., Jiangsu, CN;
Abstract
A powerless helical locking mechanism for a door includes a screw with a variable lead angle connected with a power source, and a self-adaptive nut connected to the door. The helical slot of the screw is divided into a working segment with the helical lead angle greater than the friction angle, a closing segment with the helical lead angle smaller than the friction angle, and a transition segment between the closing and working segments. The power source actuates the screw to rotate bidirectionally.