New or Improved Method for Producing and Regulating Sliding or Rotary Motion by Differential Mechanism Driven by Electric Motors Differentially Controlled.

摘要

112,963. Martin, A., Whitfield, J., Campbell, T. B., and Campbell, A. J. Dec. 1, 1916. Systems depending on the use of two motors.- Two motors, differentially controlled, are connected by worm gearing to differential screw or mitre gearing to give rectilinear or rotary motion. In the arrangement shown in Figs. 1 and 3, the motors 1, 2 drive worm-wheels 4, 7 respectively, the wheel 4 being secured to a sleeve 5 threaded internally to suit the screw spindle 6, which can move axially through the wheel 7 but is feathered to rotate it. A bell-crank lever 8 on a pivot 9 is connected by a link 13 to a valve or governor, and a lever 10 on the pivot 9 is connected to a slide rod 11 which is also connected by levers 12, 21 to the rheostat arm 24. The lever 12 is also connected by the rod 19 to a rocking lever 18 operated by series and shunt electro-magnets 14, 16. As the prime mover of the generator 33 is started up, the motors 1, 2 run at equal speeds and there is no axial movement of the spindle 6. With no load on the generator, the shunt solenoid 16 operates the rocking lever 18 to pull the rod 21 and move the rheostat arm 24. This varies the strengths of the motor fields and causes the motor 1 to run faster and the motor 2 to run slower. The spindle 6 moves axially and operates the link 13 to close the governing valve. With load on the generator, the series solenoid 14 comes into action and this opposes the action of the solenoid 16. In a modification, differential mitre gearing is employed instead of the screw gearing.