US PATENT SUBCLASS 172 / 619
.~ Plural tool groups relatively vertically movable because of operation

Current as of: June, 1999
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172 /   HD   EARTH WORKING

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
619.~ Plural tool groups relatively vertically movable because of operation {9}
620  DF  .~.~> Parallel transverse tooth bars {2}
623  DF  .~.~> Groups abreast and in tandem
624  DF  .~.~> Plural groups movably connected to forward transverse draft bar {4}
628  DF  .~.~> Similar groups arranged to form a triangular shape
629  DF  .~.~> Three or more laterally spaced groups
630  DF  .~.~> Groups pivoted to opposite sides of longitudinal draft member
631  DF  .~.~> Groups movable about common longitudinal axis
632  DF  .~.~> Group movable about oblique horizontal axis
633  DF  .~.~> Group pivotal about intermediate transverse axis

DEFINITION

Classification: 172/619

(under subclass 613) Apparatus comprising a plurality of groups of earth working elements interconnected by means which permits one group to rise and fall or pivot vertically as a unit with respect to another group under the influence of the forces applied thereto during operation, without intervention of an attendant.

(1) Note. This subclass includes those groups of earth working elements which are interconnected one to the other by means of loose or flexible linkage whereby as disclosed a group may move vertically a slight amount on encountering an obstacle or on traversing an uneven or undulating terrain.

SEE OR SEARCH THIS CLASS, SUBCLASS:

643, and 657+, for a plurality of single tools which are individually mounted for vertical movement one relative to the other during operation.