Joints and connections – Interfitted members with external bridging piece
Patent
1975-01-06
1976-09-21
Scott, Samuel
Joints and connections
Interfitted members with external bridging piece
64 4, 64 9R, 64 25, 74 152, 403315, 192114T, F16D 300
Patent
active
039811581
ABSTRACT:
This invention relates to a disconnect coupling for drivingly connecting separate parts of a drive shaft, and finds particular application in helicopter tail rotor drive shafts. The coupling comprises components fixed respectively to the shaft parts and being separable in a generally axial direction to enable the drive shaft parts to be disconnected, and includes retaining means automatically operative to prevent axial separation of the separable components during rotation. In one embodiment a cylindrical drive member is coupled to one drive shaft part and includes adjacent one end a radially inwardly extending flange having a central aperture for co-operation with a retaining member secured on the other drive shaft part, the retaining member being arranged to protrude through the aperture when the coupling components are drivingly connected. Internal gear teeth are provided adjacent the other end of the drive member to mesh with external teeth on a gear rotationally fixed to the other drive shaft part to transmit torque between the drive member and the other drive shaft part when the components are drivingly connected. A plurality of flyweights are arranged in the retaining member so that at least part of each flyweight is automatically extended on rotation of the coupling so that movement of the retaining member through the aperture is prevented thereby to prevent separation of the coupling components during rotation.
REFERENCES:
patent: 1853359 (1932-04-01), Kaiser
patent: 2071641 (1937-02-01), Lunn
patent: 2873589 (1959-02-01), Crankshaw
patent: 3062025 (1962-11-01), Bastow et al.
patent: 3224223 (1965-12-01), Wildhaber
Heald Randall
Scott Samuel
Westland Aircraft Limited
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