Fence lever control device for a combination lock
US4756176A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Jun 13, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7356
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fence lever control device for a combination lock provides a pivoted plate having an arm positioning a spring to normally bias the fence lever of the lock in a position out of engagement with the fence lever operating cam wheel, with an actuator roller mounted to the cam wheel which engages a follower surface on the pivoted plate once on each complete revolution of the cam wheel in a given direction in response to similar rotation of the dial shaft to which the cam wheel is mounted to thereby shift the pivoted plate and its associated spring mounting arm in an over center fashion to place the spring in a position to bias the fence lever toward the cam wheel, movement of the fence lever into engagement with the cam wheel being prevented by engagement between the fence member and the tumbler wheel assemblies when the wheel assemblies are not oriented in a predetermined relationship.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.