Tumbler lock having peripheral key
US4578969A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 1984 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Nov 26, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7881
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A peripheral key for a tumbler lock, the key being transversely curved concentrically with the axis of the lock, and having an L-shaped groove to pass a sentry lug on a lock. The L-shaped groove has a longitudinal leg opening longitudinally at the free end of the lock, and a lateral leg communicating with the inboard end of the longitudinal leg and opening laterally to enable the sentry lug to pass along and out of the L-shaped groove to free the key for further operative movement. A tumbler lock having code discs and actuating discs, and a pusher plate having a lost-motion connection with a mounting plug to pick up the plug after predetermined movement of a curved peripheral key. A key as first described above, together with a lock having a sentry lug for accommodating insertion of the key into the lock. A lock and peripheral curved key wherein the key has concentric inner and outer surfaces engaging mating curved surfaces on a lock housing and central internal components to maintain the key in a longitudinal position while being used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.