Surface micromachined counter-meshing gears discrimination devic

Details Surface micromachined counter-meshing gears discrimination devic Surface micromachined counter-meshing gears discrimination devic

1998-06-24

2000-12-12

Graysay, Tamara L.

Machine element or mechanism

Gearing

Directly cooperating gears

70190, 359230, E05B 6300, E05B 6500, F16H 100

Patent

active

061582972

ABSTRACT:
A surface micromachined Counter-Meshing Gears (CMG) discrimination device which functions as a mechanically coded lock. Each of two CMG has a first portion of its perimeter devoted to continuous driving teeth that mesh with respective pinion gears. Each EMG also has a second portion of its perimeter devoted to regularly spaced discrimination gear teeth that extend outwardly on at least one of three levels of the CMG. The discrimination gear teeth are designed so as to pass each other without interference only if the correct sequence of partial rotations of the CMG occurs in response to a coded series of rotations from the pinion gears. A 24 bit code is normally input to unlock the device. Once unlocked, the device provides a path for an energy or information signal to pass through the device. The device is designed to immediately lock up if any portion of the 24 bit code is incorrect.

REFERENCES:
patent: 4099161 (1978-07-01), Wolski
patent: 5626040 (1997-05-01), Benavides
patent: 5804084 (1998-09-01), Nasby et al.

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