Model: 044 Variable Speed and Reverse Drive
The revolving disk is the driver, transmitting power to shaft carrying vertical wheel. This form of drive does two things—it varies the speed and reverses the motion of the driven shaft. The vertical wheel increases in speed as it is moved away from the center and reverses as it crosses center of driving disk. Such a device has been used on automobiles and does away with shifting gears, but it has not been found practical because of the high friction.
[Virginia Downward & William M. Clark, 1930]

[Editor’s Note: This is a friction wheel mechanism in a class similar to the Reuleaux-Voigt models series W-1 to W-6 and Model Y-10. The mechanism not only changes the speed of the output shaft, but also changes the direction of the axis of motion by 90 degrees. The Reuleaux Model Y-10 also can change speed with friction wheels but the input and output axes of rotation are parallel. Since the 1930's when the above description was written, there have been variable speed transmissions used in vehicles using belt drives and variable diameter pulley wheels. The Clark model was designed after the mechanism in the 1868 catalog of mechanical movements of Henry T. Brown, Figure 28. FCM]

Francis Moon 2005-00-00

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