Which component limits the upward movement of the door hanger?

The component that limits the upward movement of the door hanger is the upthrust. This mechanical aspect is designed to absorb and manage the forces exerted on the door as it operates. Specifically, the upthrust helps prevent any unintended upward travel of the door hanger, ensuring it remains within the specified alignment and operational limits.

In the context of passenger elevator door operation, it is essential for the door mechanisms to function smoothly and safely. The upthrust serves a critical safety role by controlling the vertical motion of the door, which contributes to the overall reliability and efficiency of the door operation system. Understanding this component is key for technicians working on elevator systems, as it aids in maintaining proper door functionality and preventing malfunctions associated with excessive movement.