US PATENT SUBCLASS 74 / 424.8 R
.~.~.~ Screw and nut

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

640  DF  GEARING {31}
412 R  DF  .~ Directly cooperating gears {8}
424.5  DF  .~.~ Spiral {4}
424.8 R.~.~.~ Screw and nut {6}
424.8 A  DF  .~.~.~.~> Split nut
424.8 B  DF  .~.~.~.~> Differential nut
424.8 C  DF  .~.~.~.~> Planetary
424.8 VA  DF  .~.~.~.~> Valve actuators
424.8 VZ  DF  .~.~.~.~> Variable impedance
424.8 NA  DF  .~.~.~.~> Nonrecirculating balls

Unofficial Alpha Subclasses: R A B C VA VZ NA

DEFINITION

Classification: 74/424.8

(under subclass 424.5) Gearing of the screw and nut type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

89+, for mechanical movements of the reciprocation or oscillating to or from alternately rotary type.

499, for screw and nut type, hand operated control lever and linkage systems.

841, for screw and nut mechanisms changing the position of a driven means "on the fly".

SEE OR SEARCH CLASS

222, Dispensing, 390, for screw actuated follower mechanism.

226, Advancing Material of Indeterminate Length,

52, for means for advancingly engaging helixes in material.

254, Implements or Apparatus for Applying Pushing or Pulling Force,

98+, 204, and 231+, for screw and nut drive operated implement or apparatus.