Combination lock with an additional security lock
US4904984A · kind A · utility
Inventors
Key dates
| Filing date | Jun 10, 1988 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Jun 10, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7424
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A combination lock is provided with an additional security lock wherein an electrically operable solenoid, having an armature post normally biased outwardly of a solenoid body is mounted to the combination lock housing so as to position the armature post normally to block movement of either the combination lock bolt or the bolt release lever associated with the bolt. An electrical signal generator which may be an electrical switch, electronic lock mechanism or other electrical signal generating means, is provided for selectively operating the solenoid to retract the post from a bolt and/or bolt release lever blocking position to thereafter allow operation of the combination lock in an otherwise standard mechanical manipulation or electronic digital input of the main combination lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.