| 摘要 |
1,196,218. Variable pitch propellers. UNITED AIRCRAFT CORP. 10 Dec., 1968 [9 Feb., 1968], No. 58603/68. Heading B7V. [Also in Division F2] A safety device in a propeller pitch change mechanisms moves automatically to a predetermined position on failure of an input linkage. A cylinder 2 rotatably mounted in a housing 15 carries a pulley 8 engaged by a cable from a control lever, and a gear sector 24 meshing an input gear 25 of a pitch change motor (not shown). A piston 6, urged axially in the cylinder 2 by a spring 14, is normally held against movement by a detent 12 while the cable linkage is intact, pressure of the cable in the groove of pulley 8 holding the detent 12 in its locking position. A cam follower 18, 20 on the piston-rod 13 engages axial slots 19 in the cylinder 2 to connect the piston and cylinder for rotation together. Following failure of the cable linkage, axial movement of the piston 6 due to the spring 14 causes the follower 18, 20 to engage a cam surface 16 in the housing 15, to rotate the cylinder to said predetermined position. |
