| 摘要 |
A compact, spring actuated, counterbalance system (10) for relatively large, inwardly opening aircraft bulk cargo doors (11) and similar closures of the type adapted to be pivoted about a horizontal hinge axis (12) oriented along the upper edge of the door (11) which is of the type commonly shifted through angles on the order of about 50 DEG between fully closed and fully opened positions and employing: (i) an overhead conventional type compression spring assembly (15) including a housing (20), a spring actuator (21) movable axially through the housing (20), and an axially compressible spring assembly (19a-19d) bottomed at one end on the housing (20) and at its opposite end on the spring actuator (21); (ii) a bell crank assembly (16) having a bell crank (24) pivotally mounted on the overhead aircraft structural frame (18) and having a pair of angularly related crank arms (24a, 24b); (iii) a control link (25) pivotally connected at one end to one of the angularly related crank arms (24b) and pivotally connected at its opposite end to the aircraft door (11); and (iv), a cable (22) coupled at one end to the spring actuator (21) and extending axially through the spring assembly (19a-19d) and the spring housing (20) and having its opposite end connected to the other of the crank arms (24a).
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