US PATENT SUBCLASS 172 / 499-- .~.~ Spring means alternately biases tool in opposite directions

US PATENT SUBCLASS 172 / 499
.~.~ Spring means alternately biases tool in opposite directions

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	DF	.~ Tool spring biased during operation {3}
499		.~.~ Spring means alternately biases tool in opposite directions

DEFINITION

Classification: 172/499

(under subclass 497) Apparatus in which the resilient means is active to press the earth working element downwardly when the earth working element is in operative position and is so arranged to provide an upward bias on the earth working element as it is raised to transport position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494, for tools held in raised position by an overcenter or toggle holding device by the weight of the tool acting on the holding device.

506, for spring-assisted or spring actuators which may include a spring device for biasing the actuator to raise or lower the tool.