GB1358283A - Agricultural implement - Google Patents

Abstract

1358283 Harrows H VISSERS NV 4 Oct 1971 45995/71 Headings A1B and A1P An agricultural implement comprises a harrow frame 19 carrying at least two transversely reciprocating tine beams 30, a roller frame 60 on which a rotor or rotors 1, 67 are mounted to lie behind the harrow frame, and an arrangement for attaching the implement to the three point hitch of a tractor, which arrangement permits the harrow frame 19 to swing a horizontal plane relative to the roller frame 60. In Fig. 1 and 2 a transverse beam beam 20 of the harrow frame pivotally carries levers 28 to which tine bars 30 are pivoted. The tractor p.t.o. is universally jointed to a shaft 34, journalled in the harrow frame and carrying a flywheel 36. A fork 44 eccentrically journalled in the harrow frame and carrying a flywheel 36. A fork 44 eccentrically journalled to the end of shaft 34 engages via ball bearings two coaxial arms 43 of a crank 44, the two lower arms 45 of which are journalled in the beams 30. Thus rotation of the p.t.o. causes oscillation of crank 44 and reciprocation of beams 30. The transevrse beam 21 of the harrow frame 19 is pivoted at its mid-point to a transverse rod 54. Reslient stops 57 for the harrow are fixed to the ends of rod 54. Rod 54 and the roller frame 60 are connected by pins 53 and balls 52 to the lower tractor links 48. Two support plates 25 extend from the harrow frame and are connected by a pin 51 and ball 50 to the upper tractor link 49. The top of the roller frame is connected to the plates 25 by a screw rod 61 for rotatably adjusting the roller frame about the lower link pins 53. The tubes 65 of the roller frame carry a transverse beam 9. Two rotors I are fixed to beam 9 and two rotors 67 are mounted on beams 68, Fig. 3. not shown, pivoted to the ends of beam 9 on longitudinal axes. The rotors 1, 67 comprise a number of discs 4 having radial teeth 5 through which are mounted square section bars 11 as shown in Fig. 7. In the second embodiment. Fig. 8, the transverse rod 54 is omitted and the harrow frame 119 is connected by links 137 pivoted on pins 153 to the lower tractor links 48 and has resilient stops 173 carried by the links 137.