Lock including means for sensing position of bolt and for indicating whether or not bolt is extended from lock case
US6212923A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1998 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Jul 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7915
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dead bolt lock automatically blocks the extended bolt to prevent externally-applied force from thrusting the bolt back into the lock case, and in the event of physical attack the lock responds by prolonging or perpetuating the dead bolt blocking condition. A push-pull lock has a bolt whose motion in both directions is stopped in response to detection of a rise in motor current above a certain level: a cushioning arrangement allows the current-limiting feature to be implemented without risk of damage to the motor, gear teeth or other drive components. A re-locker arrangement includes an angled flange that is part of a motor-supporting bracket; when forcibly pressed, the flange breaks plastic pins to release a spring-biased re-locker wire to block the bolt from being withdrawn, and when the wire is in the dead bolting position an extension of the re-locker wire engages a ridge in the lock's case to prevent the re-locker from being manipulated back to its original position. Either lock can control the position of a bolt works blocking element that selectively engages a lever-driven mechanism that blocks and unblocks the door from being opened. A sensor switch, especially for use on …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.