Universal key blank and key duplication method
US5167171A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1991 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Feb 4, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T409/303696
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A universal key blank incorporates special geometry enabling it to be used as a blank for duplicating a variety of related but geometrically dissimilar keys. The universal key blank functions with a lock having a lock entrance slot with opposing sides and first and second opposed key interface ribs protruding from the sides of the slot with relative vertical alignment to rib geometry configured to engage first and second grooves formed in opposing sides of the blade of the universal key blank. A novel method duplicates keys by measuring and reproducing a reference distance defined by the spacing between the bit notch pattern and the key reference surface forming the first groove of the master key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.