| 摘要 |
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 device, and such key-operation (with the drive screw removed) will also disable the trim linkage operation of the device, selectively.
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