Harrow device

Claim 1

FOR USE WITH A CHISEL PLOW MOUNTED ON A CHISEL PLOW SHANK, A HARROW DEVICE COMPRISING A TOOL BAR, MEANS ADAPTED FOR ROTATABLY MOUNTING THE TOOL BAR ON THE CHISEL PLOW SHANK, AT LEAST ONE HARROW TOOTH, MEANS FOR MOUNTING THE TOOTH ON SAID TOOL BAR, RESILIENT MEANS ADAPTED TO BE MOUNTED ON THE CHISEL PLOW SHANK AND OPERATIVELY CONNECTED TO SAID TOOTH TO HOLD THE TOOTH RESILIENTLY IN CONTACT WITH THE EARTH TO BE WORKED BUT TO PERMIT DEFLECTION OF THE TOOTH BY AN OBSTACLE ENCOUNTERED BY THE TOOTH TO ALLOW THE TOOTH TO PASS OVER THE OBSTACLE WITHOUT DAMAGE TO THE TOOTH, SAID MEANS FOR MOUNTING THE TOOTH ON SAID TOOL BAR COMPRISES A TOOTH HOLDER ON THE TOOL BAR, COOPERATING MEANS ON THE TOOTH HOLDER AND THE TOOTH FOR RETAINING THE TOOTH IN A PRESELECTED VERTICAL POSITION, SAID TOOTH BEING PROVIDED WITH AN EARTH ENGAGING WORKING END PORTION AND AN END PORTION OPPOSITE TO SAID WORKING END PORTION, SAID TOOL HOLDER COMPRISING A TUBULAR MEMBER THROUGH WHICH THE OPPOSITE END PORTION OF THE TOOTH EXTENDS, MEANS ENGAGING SAID OPPOSITE END PORTION OF THE TOOTH FOR WEDGING SAID OPPOSITE END PORTION AGAINST TUBULAR MEMBER, A PAIR OF EYEBOLTS THROUGH THE EYES OF WHICH THE OPPOSITE END PORTION OF THE TOOTH EXTENDS, A FIRST RETAINING PLATE ON SAID TUBULAR MEMBER, A FLAT PLATE HAVING AN APERTURE ADJACENT EACH END THEREOF THROUGH WHICH THE EYEBOLTS EXTEND, A SECOND RETAINING PLATE ON SAID FLAT PLATE, SAID RETAINING PLATES HAVING A SHAPE CONFORMING TO THE SHAPE OF THE TOOL BAR FOR FIRMLY GRIPPING OPPOSITE FACES OF THE BAR, AND LOCKING MEANS RECEIVED BY THE EXTENDED END OF THE EYEBOLTS AND BEARING AGAINST THE FLATE PLATE TO HOLD THE RETAINING PLATES IN TIGHT FRICTIONAL ENGAGEMENT WITH THE TOOL BAR.