An earth working implement has a main frame, a main blade supported on the main frame transversely to the forward direction, and two wing blades pivotally supported at opposing ends of the main blade for movement between forward and rearward projecting orientations. A tilt actuator controls angular orientation of the main blade relative to the main frame about a lateral axis. Two rear wheels support the rear end of the frame for rolling along the ground. A hitch arm extends forwardly from a pivotal connection of the main frame for connection to a towing vehicle so as to vary in angular orientation relative to the main frame independently of the main blade. Furrow openers in a laterally spaced apart row are movable relative to the main frame between a working position protruding below the cutting edge of the main blade and a raised storage position.

A seabed plow capable of over-the-stern release and retrieval is usable in any of boulder clearing, trench cutting and backfill modes. In its boulder clearing mode, the plow uses its skid in torquing configuration followed by moldboards to push boulders out of the path to be trenched. In the trench cutting mode, the plow uses the skid in the same configuration with its share and moldboards for initial trench depth and the same share and moldboards with moldboard extensions for increasing trench depth in subsequent passes. In the backfill mode, the plow uses its skid in trench-straddling configuration following a blade with a passage designed to discharge fragmented spoil directly onto the pipe being covered. Thus, a single plow can be reconfigured for all modes for release and retrieval to and from a relatively small vessel without use of heavy lifting equipment.

An attachment for a skid steer, tractor or similar work vehicle especially designed for creating a swale or ditch in the earth has an arcuate, generally semi-circular steel blade of a predetermined height dimension and a diametrically extending support member welded to ends of the blade. Welded centrally on the support member is a conventional quick-attach plate, a pair of elongated braces extend between and are welded to the quick-attach plate and the arcuate blade.

The Row Digger provides a tool that enables an operator of the Row Digger to remove dirt piles interfering with irrigation between crop field furrows and irrigation trenches. The Row Digger includes a frame capable of moving from a transportation position to an operation position. The Row Digger also includes a plurality of digger arms extending from a central hub and each terminating in a corresponding digging disc. The central hub is connected to the frame at a hub angle and is capable of rotation about a hub axis. Each digging disc is also connected to the corresponding digger arm at a disc angle. Each digging disc enters a crop furrow and utilizes the slopes of the ridges to create the rotation required about the hub axis and ensure a path of travel for the digging discs that removes the impeding dirt piles.

An apparatus for forming a trench in a sea floor and/or displacing material on the sea floor is disclosed. The apparatus comprises a body and front skids mounted to the body for engaging the sea floor and supporting the body. The front skids are adjustable between a first mode, in which the front skids engage the sea floor, and a second mode, in which the front skids engage the sea floor adjacent the trench and at the trench walls.

A ditch forming implement, for use with a working vehicle, has a frame for towing connection to the working vehicle and which supports a rotatable impeller member thereon for spreading soil in a laterally outward direction relative to a forward path of the implement. A driven pulley wheel is fixed to a rear of the impeller member for rotation together relative to the frame. A drive shaft assembly operatively transfers rotational drive from a power take-off of the working vehicle to a driven pulley wheel on the frame, to be subsequently transferred to the driven pulley wheel by a drive belt connected between the driven and drive pulley wheels.

A method and apparatus for installing a monitoring cable or other utility near an existing pipeline. An electromagnetic signal may be induced on the pipeline. Sensors disposed on an installation vehicle communicate with a processor to determine a distance and orientation of the vehicle relative to the pipeline. A plow or other digging tool opens a trench and installs the cable along a path disposed next to the pipeline within an acceptable distance range from the pipeline. The vehicle may be remotely or automatically operated.

A bit assembly includes a base block and a bit having a forward body portion and a shank. The bit includes a diametrically expanding retainer circumferentially disposed around a shank of the bit adapted to maintain the interference contact between the bit and the base block as the diameter of a bore of the base block increases from use. The bit assembly also includes a sealing gasket that forms a force fit between a washer disposed about the shank of the bit and the base block.

A machine pushed trencher assembly includes a first plate that is triangularly shaped. A pair of second plates is coupled singly to and extends transversely from opposing sides of the first plate. The second plates are coupled to define a cutting edge. A fourth plate that is coupled to a base of the first plate is configured to couple to a front end of a machine. A second bar is coupled to the fourth plate and extends angularly above the second plates. A third bar is pivotally coupled to the second bar. An actuator is coupled to the second and third bars. At least one wheel is rotationally coupled to the third bar. The machine compels the cutting edge through a substrate to prepare a trench. The actuator positions the wheel so that it rolls on a surface of the substrate to control a depth of the trench.

Apparatus and method contemplating plowing with a plow blade having a subsurface cutting edge and an opposing trailing edge. A tow link is supported by the plow blade at the trailing edge. A source of pressurized fluid is connected to a discharge conduit supported by the plow blade. The discharge conduit is supplied with pressurized fluid by the source and the discharge conduit has a discharge opening positioned to discharge the pressurized fluid adjacent the link.