Abstract: A reversible plough to be towed behind a propelling vehicle has a forward section with a number of pairs of reversible plough bodies and a rear section also having a number of reversible plough bodies. The forward section and rear section are coupled together by a connection portion. A wheelset is mounted to the connection portion and is arranged to support a rear end of the forward section and a forward end of the rear section. A headstock rotatably mounts the forward end of the rear plough to the connection portion and is adjustable in order to vary the inclination of the axis of the rear plough beam to adjust the rear section between a ploughing position and an inoperative transport position. A mounting bracket connected to the forward plough beam of the forward section is rotatably mounted on the connecting frame portion.

Abstract: A combination of a reversible plough with a plurality of soil preparation devices including an improved height control system. The apparatus includes a headstock by means of which the combination can be mounted on lifting arms at the rear of a propelling vehicle. The soil preparation devices are each mounted on a movable part of a plough frame via a respective swivel coupling that allows the device to be towed and also to be suspended during plough body reversal. A common hydraulic pressure control circuit is provided to control the height of each soil preparation device relative to its respective swivel coupling, and to provide automatic self-compensating adjustment of each device as they follow the contour of the ground.

Abstract: A reversible plough, that in one embodiment is of the semi-mounted type, and comprises a main beam, a coupling structure at the forward end of the main beam, and a carrying beam. Pairs of plough bodies are mounted along the length of the carrying beam. The carrying beam is pivotably connected to the main beam to move between a first and a second ploughing position for plough body reversal. The reversible plough further includes a coupling beam that is secured to the carrying beam, and a soil preparation device such as a packer that prepares the soil turned over by the plough bodies for seed. The coupling beam projects laterally from the coupling beam in either ploughing position and is moveable with the carrying beam during plough body reversal. A hopper is mounted at a fixed location relative to the packer and the reversible plough combination, and a distributor is mounted on the packer and arranged to distribute the hopper content onto the ground.

Abstract: A hole opener used in conjunction with drilling in at least one of boulder and rubble stone formations includes first and second sets of cutters. Each of the cutters of the first and second sets of cutters has cutter teeth thereon and further include a shaft. The hole opener also includes a tubular carrier body, a first device for fixing the first set of cutters to the tubular carrier body so that the first set of cutters is positioned in a common first lateral plane with respect to a longitudinal axis of the tubular carrier body, and second device for fixing the second set of cutters to the tubular carrier body so that the second set of cutters is located in a second lateral plane with respect to the longitudinal axis of the tubular carrier body and at an axial distance from the first set of cutters along the longitudinal axis.

Abstract: An assembly on an agricultural implement, especially a semi-plow, wherein the assembly comprises a plurality of pivotable and mutually interacting parallelograms and a plurality of partially interconnected link members (12, 26, 31, 34, 41) which regulate the implement's support wheel (22) and a turn limiter (44), whereby the turn limiter (44) is automatically regulated when the implement is being adjusted to adapt it to the tractor track as well as to the desired plow strip width so that the maximum angle of deflection, to the right or to the left, between the tractor and the turn limiter (44) is held constant no matter what the angle assumed by the implement in relation to the driving direction, said turn limiter thus preventing the tractor from abutting against the implement when the tractor turns sharply, while at the same time the wheel (22) is automatically correctly adjusted when the implement is being adjusted to adapt it to the tractor track and the desired plow strip width, whether the implement is d