Appeal No. 2004-2131 Page 5
Application No. 10/016,719
mounted in the elevator platen 25. The motor 27 is reversible so that the motor may
turn the screw 30 either clockwise or counterclockwise to raise or lower the tickets. A
guide shaft 32 is fixed to the container 20 with the platen slidable on the guide shaft.
The action of the guide shaft 32 interacting with the screw 30 serves to keep the platen
25 mechanically aligned in the X, Y and Z coordinates.
Joffe's invention is directed to a rotatable drive mechanism for producing linear
motion of an object. The rotatable drive mechanism includes driving and driven
members, one of which is elongated, and which act cooperatively through frictional
engagement to produce longitudinal motion of the driven member. The rotatable drive
mechanism also includes a magnetic coupling having at least first and second
magnetizable members with mutually facing flat annular surfaces, a set of balls
disposed in a generally annular arrangement between those flat surfaces, and magnetic
means attracting the magnetizable members to each other. Respective ends of the
magnetic coupling are fixedly secured to the driven member and to the object,
respectively. Since the elements of the magnetic coupling, in and of themselves, would
permit relative rotation of parts, which is undesired, provision is also made for
restraining the undesired rotation of any part of the magnetic coupling.
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