US PATENT SUBCLASS 172 / 7
.~ Draft responsive

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

2  DF  AUTOMATIC POWER CONTROL {5}
7.~ Draft responsive {5}
8  DF  .~.~> Variable rate responsive
9  DF  .~.~> With manual actuator to select type of condition sensed
10  DF  .~.~> Sensitivity adjustment
11  DF  .~.~> With excess draft release
12  DF  .~.~> Overload lift type

DEFINITION

Classification: 172/7

(under subclass 2) Apparatus in which the condition change which is sensed is a change in the force required to move the earth working element along the ground.

(1) Note. For classification under this definition a patent must claim the automatic control feature in some detail. A mere broad reference in a claim to an automatic control as, for example, a mere broad reference in a claim to a top link in a three point hitch broadly described as a link for automatically controlling a power lift is not enough. See Search Notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for apparatus including means to automatically control the power means of a vehicle for propelling a tool which may be

responsive to the draft force on the earth working tool.

239+, for draft or pitch responsive depth control for implements, the control being other than of the automatic power control type.

439+, for patents with claims of the nature described in (1) Note above. SEE OR SEARCH CLASS

280, Land Vehicles,

446.1+, for articulated vehicles with a hitch responsive to changes in the draft load, there being no disclosure of an earth working element being the cause of the change in draft load, and subclasses 405.1+ for articulated vehicles with an adjustment to distribute the load between the vehicles or from one vehicle to another.