US PATENT SUBCLASS 172 / 497
.~ Tool spring biased during operation

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

452  DF  WITH ACTUATOR ADAPTED TO LIFT TOOL FOR TRANSPORT ON WHEELED FRAME OR BROADLY CLAIMED IMPLEMENT {37}
497.~ Tool spring biased during operation {3}
498  DF  .~.~> Biased to neutral position
499  DF  .~.~> Spring means alternately biases tool in opposite directions
500  DF  .~.~> Tool spring pressed downwardly

DEFINITION

Classification: 172/497

(under subclass 452) Apparatus in which the earth working element is biased by resilient means during operation of the device.

(1) Note. The mere recitation in a claim that the earth working element is a spring tooth or formed of a spring material is not enough for classification under this definition.

(2) Note. A mere spring-biased hitch is not included. See subclass 678 for such devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:

117, for driven earth working elements which are yieldably mounted on a supporting frame.

705+, for earth working elements which are spring biased or formed or have a part which is spring biased or formed.