US PATENT SUBCLASS 172 / 261
OVERLOAD SHIFTING

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

261OVERLOAD SHIFTING {6}
262  DF  .~> Alternate tool brought into operation upon shift
263  DF  .~> Actuator released
264  DF  .~> Against spring return device {1}
269  DF  .~> Resilient latch
270  DF  .~> Friction lock
271  DF  .~> Frangible lock (e.g., shear pin, etc.)

DEFINITION

Classification: 172/261

(under the class definition) Apparatus comprising an earth working element and means permitting the element to shift with respect to the earth or with respect to its supporting or propelling means when it meets an obstacle while being drawn over the field, said means (1) having a high initial resistance to said shifting of the element, which resistance decreases after the element starts to shift, or (2) requiring manual resetting by an attendant (e.g., a shear pin).

SEE OR SEARCH THIS CLASS, SUBCLASS:

96, for driven earth working elements having the teeth or like earth working part or portions thereof so flexibly or yieldably mounted on a driven carrier member that said teeth or like parts or portions will yield on encountering an obstacle.

233+, for an obstruction feeler for moving an implement to avoid an obstruction, including devices for forming small dams in the ground having feelers sensing accumulations of earth.

238, for a ground support moved vertically relative to a frame by a draft force.

528+, for a rolling earth working element with means for stopping or retarding its motion. 683, for an earth working element latched in earth working position, the latch being manually releasable.

705+, for spring-biased tools in which the spring resistance remains constant or increases as the tool shifts from normal working position.

SEE OR SEARCH CLASS

111, Planting,

151, for a trip mechanism claimed in combination with a planting machine.

171, Unearthing Plants or Buried Objects,

9, for unearthing devices with overload release.

180, Motor Vehicles,

14.5, for vehicle trains with an overload release. The trailing vehicle in subclass 14.5 may be a broadly named implement combined with means to control the application of pulling power on the occurrance of an overload.

280, Land Vehicles

449+, for articulated vehicles with an overload release connection between them.

464, Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts, 30+, for an overload release device in rotary drive elements.