Disc unit

A disc unit for collecting scattered particulate material from a shoulder of a road for reuse on the road when mounted on a road grader having a mouldboard extending transversely to a direction of travel of the road grader, the disc unit comprising;

• a plurality of substantally parallel spaced apart discs;
• a cutting edge about a periphery of each disc arranged to engage the shoulder;
• and
• a frame mounting the discs thereon axially along a common axis, the frame being arranged to be mounted rearwardly of the mouldboard adjacent one end of the mouldboard with each disc being oriented on the frame at an angle eytanding forward towards and laterally outwards with respect to the mouldboard, the frame being movable between an engaged position in which the discs are arranged to engage the shoulder for digging up and urging the particulate material towards a centre of the road and a raised position in which the discs are spaced upwardly in relation to the engaged position so as to be spaced upwardly from the shoulder such that the discs do not interfere with normal operation of the mouldboard of the grader;
• the common axis being arranged at an angle to a rear face of the mouldboard wherein an inner end of the axis is nearer to the rear face of the mouldboard than an outer end of the axis such that the discs mounted along the axis extend at an angle to the rear face of the mouldboard for urging the particulate material towards the centre of the road.

A disc unit for collecting said scattered particulate material from a shoulder of a road for reuse on the road when mounted on a road grader having a mouldboard extending transversely to a direction of travel of the road grader, the disc unit comprising:

• a plurality of substantially parallel spaced apart discs;
• a cutting edge about a penphary of each disc arranged to engage the shoulder;
• a frame mounting the discs thereon, the frame being arranged to be pivotally mounted rearwardly of the mouldboard adjacent one end of the mouldboard with each disc being oriented on the frame at an angle extending forward towards and laterally outwards with respect to the mouldboard, the frame being pivotal between an engaged position in which the discs are arranged to engage the shoulder for digging up and urging the particulate material towards a centre of the road and a raised position in which the discs are spaced upwardly in relation to the engaged position so as to be spaced upwardly from the shoulder such that the discs do not interfere with normal operation of the mouldboard of the grader;
• a hydraulically controlled actuator controlling pivotal motion of the frame in relation to the mouldboard such that the discs are positionable at any depth of cut within a given range of the actuator, and
• a pressure relief valve connected to the hydraulically controlled actuator such that pressure within the hydraulically controlled actuator is relieved in the event of a sudden blow on the discs from an obstruction on the road.

A disc unit for collecting scattered particulate material from a shoulder of a road for reuse on the road when mounted on a road grader having a mouldboard extending transversely to a direction of travel of the road grader, the disc unit comprising:

• a plurality of substantially parallel spaced apart discs;
• a cutting edge about a periphery of each disc arranged to engage the shoulder;
• and
• a frame mounting the discs thereon, the frame being arranged to be mounted rearwardly of the mouldboard adjacent one end of the mouldboard with each disc being oriented on the frame at an angle extending forward towards and laterally outwards with respect to the mouldboard, the frame being movable between an engaged position in which the discs are arranged to engage the shoulder for digging up and urging the particulate material towards a centre of the road and a raised position in which the discs are spaced upwardly in relation to the engaged position so as to be spaced upwardly from the shoulder such that the discs do not interfere with normal operation of the mouldboard of the grader and the frame being arranged such that a height of the discs at an inner end of the frame is adjustable in relation to the height of the discs at an outer end of the frame for leveling the discs over a range of road inclinations.