US PATENT SUBCLASS 74 / 640
GEARING

Current as of: June, 1999
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74 /   HD   MACHINE ELEMENT OR MECHANISM

640GEARING {31}
650  DF  .~> Nonplanetary gearing differential type (e.g., gearless differentials)
655  DF  .~> Single gearing unit includes fluid drive
661  DF  .~> Plural prime movers selectively coupled to common output
664  DF  .~> Plural power paths from prime mover
665 R  DF  .~> Plural power paths to and/or from gearing {10}
730.1  DF  .~> With fluid drive {2}
745  DF  .~> In series plural interchangeably locked nonplanetary units
810.1  DF  .~> Reversal of direction of power flow changes power transmission to alternate path {1}
216.3  DF  .~> Toothed gear and recirculated unconnected elements
318  DF  .~> Alternating rotary or continuous
319  DF  .~> Alternating rotary {3}
325  DF  .~> Interchangeably locked {11}
380  DF  .~> Pivotally supported {4}
388 R  DF  .~> Follow-up mechanism {1}
390  DF  .~> Eccentric driving shaft and axle
391  DF  .~> Central driving shaft in axle
392  DF  .~> Parallel shafts, adjustable gear mesh
393  DF  .~> Varying speed ratio
395  DF  .~> Adjustable {2}
404  DF  .~> Reversing means {1}
405  DF  .~> Disconnecting means
406  DF  .~> Displaceable elements
409  DF  .~> Backlash take-up
410  DF  .~> Pressure distributing
411  DF  .~> Yieldability in gear trains
411.5  DF  .~> With brake means for gearing
412 R  DF  .~> Directly cooperating gears {8}
431  DF  .~> Gear and rotary bodies {2}
434  DF  .~> Rotary bodies {5}
457  DF  .~> Teeth {3}
467  DF  .~> Lubrication {1}

DEFINITION

Classification: 74/640

(under the class definition) Mechanism comprising relatively

rotatable bodies or combinations of such bodies provided with teeth or interengaging elements, chains and sprockets, belts, and pulleys or other means not otherwise classified, whereby a rotatable body will impart to or receive motion or power from some other member by rolling contact.

(1) Note. EXPLANATORY NOTE: In 1988 a new class (Class 475) was formed by taking all subclasses relating to planetary gearing from Class 74 which appeared below subclass 640 in the Class 74 schedule. However, subclasses appearing above Class 640 in the Class 74 schedule were not screened for arrangements that might include planetary gearing, and so such higher appearing subclasses should be given consideration for a complete search on planetary gearing combinations.

(2) Note. For guide pulleys and rollers, see Class 474, Endless Belt Power Transmission Systems or Components, appropriate subclasses. Class 193, Conveyors, Chutes, Skids, Guides, and Ways, appropriate subclasses; and 384, Bearing, appropriate subclasses.

(3) Note. The rack of a rack and pinion is here included on the theory that a rack is a portion of the contacting surface of a gear of infinite radius.

SEE OR SEARCH CLASS

193, Conveyors, Chutes, Skids, Guides, and Ways, appropriate subclasses (and see (2) Note, supra). 352, Optics: Motion Pictures,

166+, for gearing specifically adapted for motion picture apparatus.

384, Bearings, appropriate subclasses and see (2) Note, supra.

408, Cutting by Use of Rotating Axially Moving Tool,

124+, for drilling machines including drive structure; and see the notes in that class definition.

464, Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts,

51+, for a flexible connection between a shaft and a member driven by the shaft.

474, Endless Belt Power Transmission Systems or Components, and see (2) Note, supra.

475, Planetary Gear Transmission Systems or Components, for planetary gears and planetary gear transmission.