| 摘要 |
A counterbalance mechanism (10) counters the weight of a door in an airplane. The door hingedly mounts to the fuselage of the airplane, and rotates upward and inward relative to the fuselage along a hinge axis. The counterbalance mechanism includes a housing (12) for affixing the counterbalance mechanism to the fuselage of the airplane. A guide tube (14) rotatably mounts to the housing for swinging movement about an axis of rotation generally parallel to the hinge axis of the door. The guide tube includes a rod (40) that extends outwardly from the guide tube. Compression springs (34) within the guide tube oppose outward movement of the rod. A linkage assembly that includes a bell crank (50) and a push rod (56) connects the guide tube to the door via rod (40) to assert counterbalancing force during the door opening and closing sequence of the door.
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