GB1352506A - Harrow - Google Patents

Abstract

1352506 Harrows R G FOODS PARENT CO Ltd 23 July 1971 [1 Aug 1970 1 Oct 1970] 37269/70 and 46641/70 Heading A1B A harrow 10 includes at least one elongated support member 14 and a helical coil 17 connected, so as not to rotate, to said member and is adapted in use to be drawn over the ground to be harrowed in a direction transverse to the axis of the coil 17. The harrow may be manually drawn by a handle 33 according to one embodiment (Fig. 4) wherein the angle of the support member 25 to the direction of travel is adjustable by removing one threaded screw 34 from threaded hole 31. In the embodiment shown in Fig. 1 a plurality of support members and coils is provided these being pivotally connected about substantially vertical axes to a spine 13 (Fig. 2) by means of flanges 15 and sleeves 16 which may allow pivotal movement of the members 14 about spine 13. The coils 17 are secured as shown in Fig. 2 by means of holes 18 and U-bolts 18a in the flanges of angle-bar support member 14 and may be rotated in the holes when worn and re-bolted. The outer ends of support members 14 are connected by tension springs 19. Spine 13 is connected to the draw links of a tractor while a further central support member 23 which is connected to the rearward end of spine 13 is connected to the top link of the three-point linkage 11. In this way the harrow may be lifted - the support members tending to swing downwardly about spine 13 and the limit of swing being decided by chains 21 connected to members 13 and 23 via bar 22. The angle of the members 14 in use'to the spine 13 may be adjusted by having a bar 20 of adjustable length connected between spine 13 and the forward most support member 14. Alternatively the bar may be connected to different points on the support member. Different arrangements of support members 14, provided that they are transverse to the intended direction of travel, are possible (Figs. 6, 7 not shown).