Patent GB-1455258-A (GB)
Title: Soil cultivating implements
IPC: A01B33/02
Filed: 1973-11-21
Abstract: 1455258 Rotary cultivating implements C VAN DER LELY NV 21 Nov 1973 [22 Nov 1972 6 March 1973] 54121/73 Heading A1B A soil cultivating implement comprises a driven transverse rotor having two groups of elongate soil working members extending helically around the rotor and which in use lift and invert slices of soil, and scrapers mounted movably behind the axis of rotation of the rotor for positively displacing the inverted slices of soil from the soil working members back into the furrow produced by the implement. In Fig. 1, the rotor comprises a horizontal shaft 5 journalled in the ends of arms 3 secured at the ends of frame beam 2, and carries soil working members 6 having blades 7 and angularly offset from each other to give a helical assembly of blades 7. The shaft 5 is driven by sprockets-and-chain from a shaft 18 is driven via a central gearbox and a shaft from the tractor power-take-off. The scraper blades 35 are oscillated between the blades 7 by means of an adjustable rod-and-eccentric 39, 40 on the shaft 18. A pair of discs 29, concave sides facing, define the strip of soil being worked. In Fig. 3, the soil working members comprise tines 57 mounted in supports 52 carried on interconnected strips 55 forming a continuous strip. The continuous strip is connected at each end to corresponding apices of parallel-sided triangular plates mounted on shaft 46, and is connected at its centre to an apex of a central triangular plate 51. This construction leads to the tines 57 being distributed tangentially with respect to their rotation paths and also leads to their tips forming two helical paths subtending 120‹ with respect to the shaft axis, and the paths having mirror symmetry about the central plate 51. Spaced scraper plates 68, mounted on the rear of the cultivator frame, interleave with the tines, two additional parallel scraper plates 64, resiliently mounted on the shaft 46, each extends between an end plate 51 and central plate 51. In operation, the tines 57 are rotated in the direction C by chains engaging sprockets at each end of the shaft 46. Displacement of soil slices occurs sequentially from the centre of the rotor to each end, and the slices are carried upwardly and rearwardly until scrapers 68 and 64 cooperate to displace the inverted slices into the excavated furrow. Three vertically adjustable coulters 86 are mounted in front of the cultivator. Another cultivator arrangement is shown in Fig. 10, in which a number of adjacent soil working members comprise triangular parallelsided plates 104 interconnected at their edges by plates 105, and at their apices by a hollow rectangular beam 107 parallel to the axis h, and carrying tines in holders regularly distributed along the beam 107. During operation, the scrapers 118 are rotated in the sense D by a chain and sprocket system, and the shaft h is driven via meshed bevel gears and a chain and sprocket system at one end of the shaft h. Two coulters 137B are provided in front of the cultivator. In use, soil slices, carried rearward over axis h, slide downwards along plates 105 under gravity, and are disengaged and inverted by the rotating scrapers 118.