US PATENT SUBCLASS 172 / 781
SCRAPER BETWEEN FRONT AND REAR GROUND SUPPORTS OF VEHICLE

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

781SCRAPER BETWEEN FRONT AND REAR GROUND SUPPORTS OF VEHICLE {12}
782  DF  .~> With laterally offset inclined shoulder forming tool
783  DF  .~> With scraper attached ground support
784  DF  .~> With diverse tool or portion {1}
786  DF  .~> Plural scrapers {1}
788  DF  .~> Push frame for scrapers
789  DF  .~> Actuator for bodily shifting scraper subframe draft connection
790  DF  .~> Counterbalance means for scraper adjustment
791  DF  .~> Three or more independently operable scraper actuators {1}
794  DF  .~> Spring biased into ground contact
795  DF  .~> Specific actuator between frame and scraper {2}
798  DF  .~> Actuator for tilting wheel relative to vehicle frame
799  DF  .~> Specific means for horizontally angling wheel relative to vehicle frame

DEFINITION

Classification: 172/781

(under the class definition) Apparatus in which a scraper is located between spaced front and rear ground supports of a vehicle, the ground supports being either wheels or wheel substitutes having no substantial earth working function.

(1) Note. A "scraper" under this definition is an earth working tool, at least a substantial portion of which is laterally or diagonally disposed and has a substantially vertically disposed face having a lower straight edge which functions to scrape earth from or slide the same along the surface of the earth to form a smooth planar surface. A tool which is disclosed as intended to cultivate the soil, or to make a furrow or a trench is not considered to be a scraper and is classifiable on other features. A scraper under this definition is frequently called a "road grader".

(2) Note. The vehicle must be a unitary stable vehicle. A scraper mounted between a vehicle and the ground support means of a device which is essentially a separate trailing vehicle or pushed vehicle is not included. Such devices are classified on other features in various subclasses.

(3) Note. A scraper is considered to be between the front and rear ground supports only if at least a portion of the scraper in a plan view is located within a polygonal area defined by a perimeter formed by lines connecting the center points of the front and rear supports, e.g., in the ordinary vehicle having front and rear wheels, within the rectangle formed by the lines connecting the center lines of the wheels.

(4) Note. A device comprising a vehicle having separate front and rear ground supports which are adjustable relative to the framework of the vehicle so that they support the framework during transport only and not during use of the scraper for its intended function is not included. Such devices are classified on other features in various other subclasses.

(5) Note. Patents having a specific disclosure of a scraper located between front and rear ground supports of a vehicle are classified under this definition even if the location is not claimed, provided that some reference to the vehicle is made in the claims. SEE OR SEARCH THIS CLASS, SUBCLASS:

63+, for apparatus comprising a driven tool such as a scraper which may be between front and rear vehicle supports.

780, for a scraper between the front and rear supports of a specially elongated vehicle.

SEE OR SEARCH CLASS

37, Excavating,

411, especially subclass 412 for scoops mounted between front and rear ground supports of a vehicle. The distinction between a scoop and a scraper is that a scoop has a bottom surface for transporting the earth while a scraper has no bottom and pushes earth ahead of it while the earth rests on the surface of the undisturbed earth beneath.