Flat key for a tumbler-containing locking cylinder of a lock apparatus
US6145357A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1998 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Feb 12, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/787
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A flat key for a tumbler-containing locking cylinder of a locking apparatus, with a key grip and, attached thereto, a key shank for locking grooves cut into the shank towards the end surface, the shank having a basic profile exhibiting an essentially T-shaped cross-sectional configuration, of which the T-bar forms a guide bar with guiding surfaces, and of which the T-stem extending in the longitudinal mid-plane provides the end surface and has wide side surfaces for the provision of profile ribs that have curvilinear cross-sectional contours. The opposite disposed wide side surfaces (5, 6, 12, 13) each exhibit at least one longitudinal groove (7, 8, 15, 16) with a groove base extending beyond the longitudinal mid-plane (M--M), in which the groove side walls (7", 7'", 8", 8'", 15', 15", 16', 16") and the end surfaces (4, 14), seen in cross-section, extend circularly or elliptically tangentially from the wide surfaces (5, 6, 12, 13) in such a way that all of the profiling--profile ribs (17, 18, 19, 20), grooves (7, 8, 15, 16) and the end surfaces (4, 14)--of the wide side key surfaces have rounded front and flank portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.