| 摘要 |
A header is provided for use with an automatic door that can form a door system including a door frame. A door operator is disposed in the interior of a header housing such that the operator is located above the door when the door is closed. A crank arm links the operator to the door such that the operator acts to open the door. In the disclosed embodiment, the housing has an inverted U-shaped configuration with a flange portion to affix a frame plate to define a frame head piece. A cover plate may be used to enclose the housing interior. In this embodiment, a sub-frame mounts on the cover plate, and the crank arm extends laterally through a slot in the sub-frame. The sub-frame can define a top strike for the door.
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