US PATENT SUBCLASS 172 / 266
.~.~.~ Including toggle linkage

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

261  DF  OVERLOAD SHIFTING {6}
264  DF  .~ Against spring return device {1}
265  DF  .~.~ Swinging about fixed pivot axis {1}
266.~.~.~ Including toggle linkage {2}
267  DF  .~.~.~.~> Toggle adjustable
268  DF  .~.~.~.~> Toggle links at acute angle

DEFINITION

Classification: 172/266

(under subclass 265) Apparatus including two links pivoted to one another, one of the links also being pivoted to the implement and the other of the links being also pivoted to the support, the links being so positioned as to offer a high initial resistance to movement of the tool from working position and a decreased resistance after some movement has occurred.