Helical locking mechanism for doors
US8291783B2 · kind B2 · utility
4Cited by
14References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2007 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Aug 3, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18704
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.