| 摘要 |
A busway system having several parallel bus bars arranged in a housing with a plug-in opening in a front wall of the housing employs a cover assembly with a plug-in unit over the plug-in opening. The cover assembly has a brick mounted onto the front wall of the housing, and a shutter attached to the brick. The brick has a plurality of cavities each of which receive a stab of one of the bus bars, and has a guide opening along its bottom wall on opposed ends. The shutter extends across the front of the brick, is positionable over the several cavities of the brick, and has a configuration corresponding to the arrangement of the cavities. A cam-linkage assembly located on opposed sidewalls of the brick is spring biased and allows the shutter to be moved along tracks of the brick for opening and closing the cavities. The plug-in unit has guide probes which enter the guide openings along the bottom of the brick as the plug-in unit is being installed onto the busway system. The guide probes contact cams of the cam-linkage assemblies, causing the cams to rotate to move the links and, therefore, the shutter in an open positioning for the cavities. Removal of the plug-in unit from the busway system removes the guide probes from the guide openings of the brick, thereby allowing the springs to move the shutter to its previous positioning to close the cavities in the brick.
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