Spur gear to interconnect rack and worm

Patent No. 6,584,867

Issued: July 1, 2003
Filed: June 20, 2001

Inventor: Kennedy; Paul G. (Horseheads, NY)

Assignee: Penn Troy Machine Co., Inc. (Troy, PA)


A gear for use as the pinion in a rack and pinion gear includes spur gear teeth that have an upper portion of the face cut in a worm cut so the gear is effective as a worm wheel for a worm gear while retaining involute curved faces so it is effective as the pinion for the rack. The rack, pinion, and worm driver are connected. When the worm gear connected to a shaft, power is transmitted from the shaft to the rack via the worm driver and pinion with all gears making line contact instead of point contact. This improvement turns one gear piece into two gears. The rack pinion can be geared to a worm gear while it is also matched up with a straight cut rack. In this way the gear translates force between the two different types of gears.


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