Tumbler wheels for combination locks
US4142388A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1977 |
| Grant date | Mar 6, 1979 |
| Priority date | — |
| Expiry date | Mar 30, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7345
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The tumbler includes a connection between an outer gate ring and an inner drive member of a tumbler wheel together. The gate ring includes a leg on the gate ring with a gripping portion thereon. The leg normally biases the gripping portion to a securing position against the drive member to grip it so that the gate ring and drive member normally rotate together. An opening is provided in the gate ring adjacent the leg having a curved portion about its periphery for receiving a key having a curved portion about its periphery. The key rotates against the curved surface of the opening, and a cam section of the key cams a cam follower portion of the leg when the key is rotated to a releasing position for urging the gripping portion away from the drive member. The camming surface, opening and cam follower are so provided that on rotation of the key in the opening to the releasing position, the biasing effect of the leg is prevented from tending to return the key to the securing position. An aperture through the case is aligned with the openings in the gate rings when the arm is in each gate for passage of the key therethrough. The key has a cut-out portion which is located in the apertur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.