Lock cylinder having two sets of tumblers and key therefor
US4638651A · kind A · utility
46Cited by
3References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 7, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Aug 7, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7932
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The usual pin tumbler lock core is provided with an additional set of security disc tumblers adapted to engage contours on the bottom rail of a key and in so doing the security tumblers are rotated as the key is inserted in the lock so that when the key is fully inserted, gates on the security tumblers all align to permit the inward movement of a side bar. The invention also envisions the key which is an otherwise conventional key having a bevelled tip and a security contour on a lateral surface for activation of the security tumblers of the lock of the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.