Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Power or manual actuator on non-rotatable part
Patent
1993-12-14
1995-07-11
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
Power or manual actuator on non-rotatable part
74586, 74594, B64C 2759
Patent
active
054315409
ABSTRACT:
One embodiment of a main rotor pitch control rod subassembly includes an upper rod end segment having a bearing subassembly, a lower rod end segment having a bearing subassembly, an eccentric bushing disposed in rotatable combination with the upper rod end segment bearing subassembly for varying the axial length of the pitch control rod subassembly, a composite central body structure interposed between the upper and lower end segments, a composite strap member wrapped around and secured in combination with the lower end segment bearing subassembly, the composite central body structure, and the upper end segment bearing subassembly, eccentric bushing combination, a composite overwrap overlayed in combination with the composite strap member, a locking key member and a clamp-up bolt for clamping the composite strap member in tensioned combination with the locking key member, and a locking bolt. The eccentric bushing has a plurality of spaced apart bushing apertures formed therethrough, and the locking key member includes a clevis configuration having a plurality of spaced key apertures formed therethrough, interaction between the bushing and key apertures providing a fine, vernier-type adjustment capability. To vary the axial length of the pitch control rod subassembly, the eccentric bushing is rotated about the upper rod end segment bearing subassembly to a predetermined position wherein one of the bushing apertures aligns with one pair of the key apertures. The locking bolt is inserted through the aligned apertures to lock the eccentric bushing in the predetermined position.
REFERENCES:
patent: 3786695 (1974-01-01), Barrett, Jr.
patent: 4111068 (1978-09-01), Bonisch
patent: 4184384 (1980-01-01), Levine
patent: 4498842 (1985-02-01), Fischer et al.
patent: 4805483 (1989-02-01), Beckmann et al.
D'Anna Frank P.
Doolin Leonard J.
Poulin Stephen V.
Larson James A.
Look Edward K.
Radke Terrance J.
United Technologies Corporation
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