US PATENT SUBCLASS 74 / 325
.~ Interchangeably locked

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

640  DF  GEARING {31}
325.~ Interchangeably locked {11}
329  DF  .~.~> Disconnectable counter shaft
330  DF  .~.~> Multiple concentric clutch shafts
331  DF  .~.~> Plurality of counter shafts
332  DF  .~.~> Internal-external gears
333  DF  .~.~> Combined gear and clutch {1}
335  DF  .~.~> Control mechanism {2}
339  DF  .~.~> Meshing assisters {1}
*  DD  .~.~> Longitudinally slidable {5}
352  DF  .~.~> Laterally slidable gears {2}
355  DF  .~.~> Single forward and reverse speeds
*  DD  .~.~> Slidable keys or clutches {3}

DEFINITION

Classification: 74/325

(under subclass 640) Transmissions in which a plurality of speeds are transmitted from one shaft to another by optionally engaging or meshing selected gears or clutches or gears and clutches, to their supporting shafts.

(1) Note. These transmissions include those which provide speed changes (1) by means of interchanging meshed gears on their shafts or (2) by replacing such gears with gears of different sizes.

(2) Note. Such gearing is found in various arts, for examples of which see the Search Notes below.

SEE OR SEARCH CLASS

29, Metal Working,

27+, for lathes of the combined machine type and (see Note 2).

82, Turning, 29, for change speed gear for headstocks. (see Note 2).

408, Cutting by Use of Rotating Axially Moving Tool,

124+, for drilling machines having miscellaneous drives. (See Note 2).

409, Gear Cutting, Milling, or Planing,

64+, for milling machines. (See (2) Note).