Door locking methods and apparatus
US4570466A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1983 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | Sep 9, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/1028
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods and apparatus for releasably locking or blocking a door combine a first element with that door for blocking the door in an extended position of that first element and for alternatively releasing the door upon movement of the first element from such extended position. The first element is releasably blocked in its extended position by removably locating a second element in a path of movement of the first element. The door may be locked by locking the first element in its extended position and blocking such locked first element with the second element. The locked first element is released by selectively removing the second element from the path of movement of the first element, and the door is released by moving the released locked first element in its path of movement while the second element is removed from such path of movement. The first element may selectively be unlocked while it is blocked by the second element, and such blocked unlocked first element may be removed for a release of the door. The first element may be provided with an anisometric configuration against movement despite a removal of the second element from the path of movement of the first element. Altern…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.