Patent GB-121351-A (GB)
Title: Improvements in or relating to the Adjustment of Ploughs or other Implements Attached to Tractors.
Inventor: GILL HUBERT ALEXANDER
IPC: A01B3/38
Filed: 1917-12-13
Abstract: 121,351. Gill, H. A., (Moline Plow Co.). Dec. 13, 1917. Motor implements; ploughs; adjusting parts of implements; frames; joints and connexions; seats; steering.-The connexion between a tractor and a trailing implement, such as a plough, which acts as a support for the rear end of the tractor, are so arranged that the vertical adjustment of the wheels of the trailing implement relatively to its frame is accomplished without affecting the vertical adjustment of the tractor. In the form shown, a two-wheeled tractor is secured to an articulated beam 12 through vertical pivots 15 mounted on a yoke 13 at the forward end of the beam 12. A hand steering-wheel mounted on the beam 12 operates a pinion 18 gearing with a curved rack 19 mounted on the power-unit frame, the centre of curvature of the rack coinciding with the axis of the pivots 15. The beam 12 also carries brackets 21, 22 in which is pivoted, with a slight fore-and-aft play, a frame 29 having depending from it a pair of hangers 30 in which the main pivot bolt 31 for the trailing plough is mounted. The ploughs, which may. be of the mould-board or the disk type, have their beams connected at their forward ends to a cross-bar 34, the beams also being connected through pivot bolts 34<a> with a pair of converging draft-arms 35 which meet at their forward ends in a clevis 36, of which the vertical pivot pin 37 may be inserted in any one of a number of holes 38 in a clevis-plate 39. Provision is also made for the vertical adjustment of the plate 39 by the arrangement of a vertical series of holes 43 in the vertical draft-bars 44 which are secured to the yoke 13. A draft-rod 48 connects a bracket at the lower end of the draft-bars to the tractor. The arms 35 have their rear ends extended beyond the pivots 34<a> and bent downwards and inwards to provide stops to limit the downward swinging movement of the plough beams relatively to the arms 35. The land-wheel 56 and the furrow-wheel 57 are mounted in cranked axles 52, 51 passing through bearings on the plough beams. A sleeve pinned to the axle 52 has secured to it a pair of curved arms 57<a> by which the plough is secured to the main pivot bolt 31. The curvature of these arms and the arrangement of the cranked portions 54 of the axles is such that the implement may swing about the pivot 31 without the vertical position of the pivot, being affected. The furrow-wheel 57 has secured to the cranked portion of its axle a cambar 58 shaped as shown and provided with a rider 60 adapted to be moved along the cam-bar by a lever 61 pivoted on a crank 62 extending from the axle 52 of the land-wheel 56. By operating the lever 61 and thus moving the cam-bar 58, the wheel 67 may be adjusted relatively to the wheel 56. A catch 63 engaging one of a series of holes 59 locks the wheels in their relatively adjusted position. The two wheels, locked together as described, are forced downwards, when it is desired to lift the ploughs, by throwing in a clutch 63<1> by the operation of a foot-lever 67, the clutch causing the operation from the land-wheel of a winch which winds up a chain 79 secured to the plough beams, thus causing the cranked parts of the wheel axles to take up an approximately vertical position. To lower the ploughs, the clutch is released and the wheels are forced forward by the operation of a hand-lever 69 pivoted on the axle of the land-wheel and yieldingly connected through a link 70 and spring with the cranked portion of the axle. The action of the bar is assisted, in order to force the cranked axles over their deadcentro, by a spring 75<a> secured at one end to a crank on the land axle and at the other to a bracket on a draft-bar 35. To give further assistance in the initial stage of lowering the ploughs, the beam 82 carrying the operator's seat is pivoted to the frame 29 at 83 and is adapted when the ploughs are raised to rest upon, and be supported by, the sleeve on the land-wheel axle. The driver's weight then assists in forcing down the plough beams. The seat beam 82 is adapted to be engaged by, and to rest upon, a stirrup 84 when the downward movement of the ploughs has been started.