Latching device
US4427223A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1981 |
| Grant date | Jan 24, 1984 |
| Priority date | — |
| Expiry date | Aug 3, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/1097
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The device comprises a latching assembly enclosed within, and translatable relative to, a centercase housing; the housing is mounted on a chassis. The device is adapted for cooperative engagement with a locking cylinder, for actuating the latching assembly, and for operation of a thumbpiece lift, by an ancillary, external, trim linkage, for translating the latching assembly. The latching device has a master, locking cylinder cam or dowel, the latter having a removable screw, which (through a locking cylinder) either operates a night-latch cam plate, to translate the latching assembly or, upon removal of the screw, allows the cam or dowel to translate a tumbler which, in turn, frees a thumbpiece lift, for operation (then) of the latching assembly by the lift, instead of by the cam plate. Accordingly, with the drive screw in place, the external, operating trim linkage can not operate the device; it must be unlatched, externally, by a key in the locking cylinder. With the drive screw removed, the use of a key in the locking cylinder will not unlatch the device, rather, in this circumstance, key-operation of the locking cylinder will enable the external trim linkage to unlatch the devi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.