Tamper resistant combination lock
US5640860A · kind A · utility
2Cited by
13References
14Claims
0Family size
Inventors
Key dates
| Filing date | Jan 11, 1996 |
| Grant date | Jun 24, 1997 |
| Priority date | — |
| Expiry date | Jan 11, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/5053
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tamper resistant combination lock including a housing having a through bore receiving a locking plunger with a plurality of integral spaced obstructions thereon, the housing having a plurality of transverse slots each receiving one of two identical blocking slides that snap between three distinct positions, one passing the obstructions and plunger, and two blocking the obstructions and plunger. Lock picking is minimized by flexible fingers in the slides that engage the plunger obstructions when the slides are in the plunger passing position to simulate the slide blocking positions as the lock picker tugs the plunger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.