Lock
US4376381A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1980 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | Nov 13, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7768
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention relates to a pin tumbler cylinder lock comprising an outer cylinder, an inner cylinder rotatably arranged in a cylindrical opening in the outer cylinder, a key-way intended for a key and at least two rows of parallel bores arranged in the outer cylinder, in which bores spring loaded tumbler pins are slidably arranged. The at least two rows of bores have different number of bores, whereby the key will be prevented from retraction in one or more angular position of the inner cylinder. The present invention relates further to a key for such type of locks, the key having notches along its edge, the depth of which being interrelated with the length of the bottom tumbler pins. At least the notch at the extreme end of the key is removed, whereby the key may be retracted in both positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.