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A coupling for operatively connecting a rotary turbine having a hub carrying a plurality of wires with a driven shaft. An external sun gear is formed on the turbine hub and a planetary gear carrier is mounted on the shaft for rotation with the shaft. The planetary gear carrier supports a plurality o

A coupling for operatively connecting a rotary turbine having a hub carrying a plurality of wires with a driven shaft. An external sun gear is formed on the turbine hub and a planetary gear carrier is mounted on the shaft for rotation with the shaft. The planetary gear carrier supports a plurality of planetary gears mounted for individual rotation which mesh with the sun gear on the hub. A ring gear carrier is mounted for rotation about the shaft and is formed with an internal ring gear which meshes with the planetary gears. A brake band surrounds the external periphery of the ring gear carrier and may be tightened to embrace the external surface of the ring gear carrier to lock it. When the internal ring gear is locked by the brake band, rotation of the planetary gears rotates the planetary gear carrier which rotates the shaft. When the brake band is loose, the ring gear carrier is rotated about the shaft by the planetary gears which are rotated by the sun gear on the shaft.

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In combination with a driven shaft and a rotary turbine having a housing forming a turbine chamber, an elongated hub rotatably mounted in said housing and extending axially through said turbine chamber, a plurality of radial wires mounted on said hub and located in said turbine chamber, a sun gear o

In combination with a driven shaft and a rotary turbine having a housing forming a turbine chamber, an elongated hub rotatably mounted in said housing and extending axially through said turbine chamber, a plurality of radial wires mounted on said hub and located in said turbine chamber, a sun gear on the external surface of an end of said elongated hub and located outside of said housing, said driven shaft coaxial with said hub adapted to be connected to and rotated by a primary power means external to said rotary turbine and a coupling for selectively connecting said hub to said driven shaft to transmit additional rotary motion, said additional rotary motion being imparted from said hub to said driven shaft to supplement the primary power applied to said driven shaft, said coupling including a planetary gear carrier nonrotatably mounted on said driven shaft for rotation with said shaft, a plurality of angularly spaced planetary gears rotatably mounted on said planetary gear carrier and the radial distance between the axis of rotation of each of said planetary gears and the axis of rotation of said sun gear being the same, each of said planetary gears meshing with said sun gear on said hub, an internal ring gear meshing with each of said plurality of planetary gears and means mounting said ring gear for rotation about said driven shaft, brake means for said internal ring gear, means to actuate said brake means to lock said internal ring gear, whereby rotation of said sun gear drives said plurality of planetary gears and said planetary gears drive said internal ring gear when said brake means is nonactuated, and wherein no additional rotary motion is imparted to said driven shaft and said internal ring gear is stationary when said brake means is actuated and rotation of said planetary gears by said sun gear rotates said planetary gear carrier and said driven shaft to impart said additional rotary motion to said driven shaft.