Plow for laying cable, flexible conduit or the like

Claim 1

IN A PLOW FOR PROGRESSIVELY CUTTING A SLIT-TYPE TRENCH IN SOIL, A CHASSIS FRAME, SUPPORTING WHEELS FOR SAID FRAME, A LIFT FRAME PIVOTED AT ONE END TO SAID CHASSIS FRAME AND MOVABLE BETWEEN LOWERED AND RAISED POSITIONS, SHAFT BEARINGS CARRIED BY SAID LIFT FRAME, A HORIZONTAL SHAFT JOURNALLED IN SAID BEARINGS AND HAVING AN ECCENTRIC CAM THEREON, A VERTICALLY DISPOSED RELATIVELY THIN BLADE-LIKE PLOWSHARE HAVING A BEARING MEDIALLY OF ITS ENDS FOR RECEIVING SAID ECCENTRIC CAM, SAID PLOWSHARE EXTENDING VERTICALLY DOWNWARDLY BELOW THE BEARING AND HAVING ITS LOWER END REGION ADAPTED TO PROJECT INTO AND PROGRESSIVELY FORM A SLIT-TYPE TRENCH IN THE SOIL AS THE PLOW IS PROPELLED FORWARDLY, SAID PLOWSHARE ALSO EXTENDING UPWARDLY ABOVE THE BEARING, AN ABUTMENT ON SAID LIFT FRAME ABOVE THE LEVEL OF SAID ECCENTRIC CAM AND SLIDABLY ENGAGEABLE WITH THE LEADING EDGE OF THE UPPER REGION OF SAID PLOWSHARE TO LIMIT THE EXTENT OF FORWARD MOVEMENT OF SAID UPPER END REGION DURING ROTATION OF THE CAM, MEANS ON SAID LIFT FRAME PROVIDING A SECOND ABUTMENT ENGAGEABLE WITH THE TRAILING EDGE OF THE UPPER REGION OF THE PLOWSHARE AND CONSTRAINING SAID UPPER REGION OF THE PLOWSHARE AGAINST REARWARD MOVEMENT WHEREBY THE LOWER END REGION OF THE PLOWSHARE IS CONSTRAINED TO MOVE IN A HORIZONTALLY ELONGATED ELLIPTICAL PATH, AND MEANS FOR ROTATING THE SHAFT.