US PATENT SUBCLASS 172 / 624.5
.~.~.~ With parallelogram-type linkage

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

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
619  DF  .~ Plural tool groups relatively vertically movable because of operation {9}
624  DF  .~.~ Plural groups movably connected to forward transverse draft bar {4}
624.5.~.~.~ With parallelogram-type linkage

DEFINITION

Classification: 172/624.5

With parallelogram-type linkage:

(under subclass 624) Apparatus in which the mechanism connecting the groups of the bar or draft beam includes a

plurality of vertically spaced links, each pivoted at an end to the bar or draft beam and at its other end to the tools, which links remain in parallel relationship to each other as they move.