GB1479304A - Haymaking machines - Google Patents

Abstract

1479304 Haymaking machines C VAN DER LELY NV 1 Oct 1974 [3 Oct 1973] 42644/74 Heading A1F A haymaking machine has all. the tines of each rotary rake member movable against a single spring from an inoperative transport position to a working position under the action of centrifugal force. Drive for the rotary rake members 3 and 4 (not shown) is taken from a tractor power take-off and is transmitted to a hub 18 which is freely rotatable about a sleeve 16 with which it is coaxial about an axis 17. A flange 21 is fixed to the hub 18 and has a housing 22 adjustably attached to it. A ring 36 embraces the outer surface of the hub 18 inside the housing 22 and is slidable upwardly and downwardly along that hub. A plurality of spokes 37 project radially from the ring 36 at regular intervals therearound and have their other ends attached to the top of an annular setting member 38. The fixed ring 39 carries at least one pair of guide strips 40 lying either side of one of the spokes 37. A compression spring 44 is wound helically around outside the hub 18 extending between ring 36 and ring 41. Pairs of tines are arranged at regular intervals about the circular flange 43 and are pivotable about shafts 46 which are in turn pivotable about stub shafts 48. Each pivotal shaft 46 is provided between corresponding tines with a lifting arm 49 carrying at its other end a ball or roller 50. The setting member 38 is provided with pairs of parallel partitions 51, one pair for each ball or roller 50. Spaces 52 are arranged in housing 22 such that each pair of tines can move vertically between an inoperative transport position and an operative position. Surrounding the rim of flange 21 which is attached to the upper surface 23 of housing 22 is an annular adjusting member 24 having an inwardly directed lip 26 overlying the top of flange 21. Bracket 27 supports locking pin 28 having a manually operable handle and extending through a hole in the lip 26, a hole in the housing top plate 23 and, between-these two holes, through a chosen one of a number of holes 29 spaced radially around and at a constant distance from the centre of the circular flange 21 coincident with the axis 17. Such an arrangement permits changeover from at tedding to a swarth or windrow preparing mode. When the rotating rake members 3, 4 are stationary the helical spring 42 is fully extended and the pairs of tines 44 are raised (Fig. 3). When the members are rotating, centrifugal force causes the tines to move into the operative position shown in Fig. 2. The arms 49 with the balls or rollers 50 serve to raise the spokes 37 against the action of the spring 42. The height of the rake members relative to ground wheels 30, is adjustable by means of a crank 34 which axially displaces a setting rod 32 threaded about a shank 33 of the crank 34.