(under the class definition) Apparatus comprising an earth working element and a means for sensing a condition or change of condition, which condition or change of condition may or may not occur, a separate control means and a separate power means for changing a condition of operation of the apparatus, said three means being so related that the sensing means controls operation of the controlling means and the control means controls operation of the power means, all without the intervention of a human operator.
(1) Note. The "power means" of the definition comprises a motor or a mechanical power take-off. For purposes of this definition a spring is not considered a power actuating
(2) Note. Apparatus in which a movement of the sensing means develops power which directly moves the power means is not included (e.g., a sensing means connected to a piston in a hydraulic transmission to directly cause movement of a piston in the power lift cylinder). See subclass 239 for such apparatus.
SEE OR SEARCH THIS CLASS, SUBCLASS:
465, for an actuator for lifting a tool for transport comprising a servo-motor with a follow up control.
SEE OR SEARCH CLASS 171, Unearthing Plants or Buried Objects,
9, for unearthing devices having automatic control.
180, Motor Vehicles,
14.5, for a connection between a motor vehicle and a trailer (including a broadly claimed implement) effective to automatically control the vehicle on occurrence of an overload on the connection, and subclasses 282+ for a motor vehicle provided with a safety-promoting means which is responsive to the sensing of acceleration, deceleration, or tilt of the vehicle.
414, Material or Article Handling,
699+, for material moving devices with a vertically swinging load support of the tilting shovel or fork type with automatic control for effecting an operation of the device.