Remote controlled auxiliary lock
US6750568B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2002 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Oct 19, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7028
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
With an auxiliary lock operated by a built-in battery, it is desired to prevent the door from being kept locked even if the battery dies. The auxiliary lock body is provided with first and second voltage detecting means for detecting that the voltage of the battery has lowered to predetermined voltages. If the first voltage detecting means detects that the voltage of the battery has dropped to a predetermined voltage, the fact is alarmed. Then, if the second voltage detecting means detects that the voltage of the battery has dropped further, the actuator is activated to open the lock by pushing down the bolt inside the lock surface before the battery dies, thereby preventing the door from being kept locked even if the battery dies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.