Patent ID: 9701397
Date: 2017-07-11
CPC Classifications: B64C,F16H

Claim:
1. A speed summing device for driving an actuator, the speed summing device comprising: a first ring gear arranged to rotate about a central axis (X); a second ring gear arranged to rotate about the central axis (X); a plurality of pairs of planet gears, each pair comprising a first planet gear driveably connected to the first ring gear and a second planet gear driveably connected to the second ring gear, wherein the first and second planet gears of each pair are driveably connected to each other; and a planet carrier providing a rotary output for controlling an actuator, the planet carrier being driveably connected to the planet gears such that movement of the planet gears around the central axis (X) causes the planet carrier to rotate but rotation of the planet gears about their own axes does not cause the planet carrier to rotate.