Cylinder lock
USRE30198E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1977 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Dec 13, 1997 |
Classification
- Technology area (CPC —)General
Abstract
A cylinder lock with a key plug rotatably mounted in the cylinder shell is described. The key plug has a plurality of tumblers that are set by the V bits of a key inserted in the key plug. The key is cut at three different levels and cut at three different angles. Each tumbler in the key plug may be positioned by the properly bitted key reciprocally to clear the shear line and also positioned rotationally to allow the fence to be cammed out of engagement with the cylinder shell. The key plug may then be rotated. A side bar cylinder lock is also described with the same key cut at three different levels and cut at three different angles. The tumblers are positioned reciprocally and rotationally by the properly bitted key to allow the fence to be cammed out of engagement with the cylinder shell. The key plug may then be rotated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.