US PATENT SUBCLASS 335 / 138
.~ Step-by-step type (e.g., closure responsive to predetermined number of control pulses

Current as of: June, 1999
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335 /   HD   ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS

2  DF  ELECTROMAGNETICALLY ACTUATED SWITCHES {30}
138.~ Step-by-step type (e.g., closure responsive to predetermined number of control pulses {2}
139  DF  .~.~> With timing or indexing means (e.g., clock mechanism)
140  DF  .~.~> Ratchet and pawl-type actuator

DEFINITION

Classification: 335/138

(under subclass 2) Subject matter wherein the device comprises means whereby plural successive energizations of a control magnet by pulses of control signal current produce a sequential or step-by-step operation of a contact actuation means whereby a single set of main contacts are opened or closed at the end of the sequence of pulsations sequence of actuating pulses may comprise any number of pulses from two or more.

(1) Note. The subject matter to be found in this and the indented subclasses should be distinguished from that classified in subclasses 107+, above, wherein a plurality of contacts are actuated in sequence in such a manner as to complete a plurality of circuits sequentially through the devices. While the contact actuating means in the above group may be similar to those found here the fundamental distinction between the two groups is that in the subclasses 107+ group there are a plurality of circuits controlled while in this group only a single set of main contacts is utilized.