Clean-room suspended ceiling

DETAILED DESCRIPTION FIG.
1 shows a runner system generally at 20 for a suspended ceiling for a clean room.
The system 20 includes the main runners 21 occuring in the middle of the room as well as the runner 22 occuring at the room's edge.
The main runners 21 and 22 connect to the end runner 23 which also has a location at the edge of the room.
As FIG.
1 shows, the runners 21, 22, and 23 have substantial length and form the main components of the system.
The system 20 also includes the cross runners 24 to 27.
The cross runners 24 to 27 only have sufficient length to extend the distance between two of the main runners 21 and 22.
In particular, the cross runners 24 extend between the edge main runner 22 and the middle main runner 21.
The other cross runners 25 to 27 only extend the distance between the two adjoining interior main runners 21.
Various types of connections occur between the different runners shown in FIG.
1.
Thus the corner connection 30 shown in the dotted circle, adjoins the main runner 22 to the end runner 23.
One end connection 31 adjoins the main runner 21 to the end runner 23 while the second end connection 32 adjoins the cross runner 24 to the main runner 22.
The two end connections 31 and 32 clearly have the same configuration.
Lastly, the cross connection 33 adjoins the cross runners 25 and 26 to the main runner 21.
Clearly, the runner system 20 will include enough of the different connections 30 to 33 to form a grid that will cover the ceiling of the clean room.
FIG.
2 provides the details of the extrusion forming the runners 21 to 27 as well as the corner connection 30 and the end connection 31.
Specifically, to form the corner connection 30, the main runner 22 connects to the end runner 23 along the 45 degree miter 37.
The miter 37 permits the meeting of the various components of the extrusions forming the runners 22 and 23 in a continuous, smooth fashion.
The corner cover plate, appearing in phantom at 38, helps secure the two runners 22 and 23 at their connection 37