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1、UnitedStatesPatent5,511,326Liebrecht,Jr.April30,1996Rotatingdisk-type ditcher AbstractAmethodandapparatusinwhichadisk-type ditcher adaptabletobeingdrawnbyatractorcandigditchesundercontrolofalasersystembywhichadesiredditchgradecanbeselected.The ditcher incorp
2、oratesadiskrotatableinagenerallyverticalplanetransversetothelineoftravelofthe ditcher, thediskhavingcircumferentiallyspacedscoopswhichduringrotationfunctionincooperationwithabottom-cuttingbladeandsoilplowingsectiontoliftthecutsoilfordischargefromanangularlyo
3、rientedoverlyingchutefordirectingsoilparticlesapre-selectedlateraldistancefromthelineoftravelofthetractor.Apairofforwardlyandoppositelypositionedangularlyadjustablesidecuttingorscrapingbladescanbeprovidedinspacedrelationonoppositesidesofthecenterlineoftravel
4、toimpartsteepersidewallstotheditchthanwouldotherwisebeformedwiththecirculardiskalone.Liebrecht,Jr.;SylvesterJ. (Continental,OH)Inventors:FamilyID:22905175Appl.No.:08/240,115Filed:May9,1994CurrentU.S.Class:37/93;37/347;37/907CurrentCPCClass:E02F3/186 (2013010
5、1);E02F3/26 (20130101);E02F3/20 (20130101)CurrentInternationalClass:E02F3/26 (20060101);E02F3/20 (20060101);E02F3/18 (20060101);E02F005/08 ()FieldofSearch:;37/907,91-93,189;172/108,113;299/39;404/90ReferencesCited [ReferencedBy]U.S.PatentDocuments2746180May1
6、956Ficker2974735March1961Smithetal.3041750July1962Garnard3261117July1966Shoemakeretal.3411225November1968Barras3417495December1968Barras3708232January1973Walsh3813171May1974Teachetal.3916543November1975Poche3994083November1976Cunningham4161072July1979Pronovo
7、st4162708July1979Johnson4193217March1980Poche4454767July1984Cartner4887372December1989Block4912643March1990Beirxe5113610May1992Liebrecht51743855259692November1993Belleretal.December1992Shinboetal.ForeignPatentDocuAug1971SUOct1975SUments310978487986OtherRefer
8、encesPublicationAgriculturalEngineering,Aug.'71,pp.418,419.."ThelaserplaneSystem"byDavidC.Studebaker..PrimaryExaminer: Warnick,IV;SpencerK. Attorney,AgentorFirm: Schroeder;CharlesF. ClaimsIclaim
