Device for working crop lying on the ground

A device for working corp lying on the ground having a frame comprising a frame beam extending transverse to the intended direction of travel, and a draw bar fixed to said frame beam and extending forwardly from said frame beam, a first gear box fixed to one end of said frame beam, an arm having one end pivotally coupled with the other end of said frame beam so as to be adjustable with respect to said frame beam about a substantially vertical pivot axis, a second gear box being pivotally mounted to the free end of said arm so as to be adjustable about a substantially vertical pivot axis with respect to said arm, a coupling rod coupled with said second gear box for fixing the arm and said second gear box in various positions on either side of said frame beam, a pair of tined rake wheels rotatable about upwardly extending rotary shafts and each drivable respectively via said gear boxes, means for reversing the direction of rotation of one of said driven rake wheels, the device being such that in a first position of said arm the rake wheel at the free end of the arm is disposed in front of the frame beam and said rake wheel can be driven in such a direction that viewed in the direction of movement the tines on the proximal sides of the rake wheels move to the rear, and in a second position of said arm viewed in the intended direction of travel the rake wheels are located obliquely one behind the other and can be driven in the same direction and the rake wheel on the free end of the arm is disposed behind the frame beam, the first gear box is provided with an input shaft to be coupled with the aid of an auxiliary shaft with the power take-off shaft of a tractor, said input shaft being coupled through a gear wheel transmission with a first output shaft, which protrudes out of the first gear box and which is provided at the other end with a first bevel gear wheel which is in mesh with a second bevel gear wheel located below the first bevel gear wheel and fastened to the respective rake wheel and with a neighbouring bevel gear wheel fastened to a second output shaft protruding out of the gear box and being arranged above the second gear wheel secured to the rake wheel in a manner such that it rotates free of the second gear wheel one of the ends of the output shafts emerging from the first gear box can be coupled selectively with the aid of an auxiliary shaft with one end of a shaft journalled in the second gear box secured to the first end of the arm.