Combination lock
US4376380A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1981 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | Jan 21, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7401
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A combination lock to be installed on a panel such as a safe door, with a manually operable knob and dial at the front of the panel and the main part of the combination mechanism at the rear of the panel. A rotary operating spindle attached to the dial and a stationary bushing surrounding the spindle extend through the thickness of the panel and are made of non-metallic material having low heat conductivity, such as nylon. An operating or driving wheel or disk fixed to the rear end of the spindle has a projection for engaging and rotating a locking wheel or disk rotatable on the bushing in front of the operating disk, and this locking wheel engages and rotates another locking wheel in front of it. When radial slots in the locking wheel and the operating wheel are all in a predetermined alignment, a spring moves a finger on a slide member into the aligned slots, and this moves the latch bolt to an unlocked position. A cam portion on the operating disk moves the slide member back to normal locking position when the dial is turned. A spring connection between the latch bolt and the slide member allows the latch bolt to retract even though the locking disk slots are not aligned for unl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.