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    • 47. 发明专利
    • Improvements in Ploughs particularly adapted for Motor-haulage.
    • GB130176A
    • 1919-07-31
    • GB1285518
    • 1918-08-08
    • SWAN PETER SMITH
    • SWAN PETER SMITH
    • A01B3/46
    • 130,176. Swan, P. S. Aug. 8, 1918. Controlling by contact with obstructions.-To throw out the clutch of a plough tractor when an obstruction is engaged or when the tractor moves backwards, a spring linkage connected with the draw-links C is employed. In this the nuts E , E' on rods D carry pins E . E engaging in slotted links attached to a lever E pivoted on the projection D . The link E is connected by a rod G to a declutching device, and, when owing to a share engaging an immovable obstacle, the angle between the links C and the plough frame is increased, the rod D is pulled downwards against the pressure of the spring E , the pin E' pressing back the link E and moving the rod G. If the tractor backs, the rod D moves in the opposite direction and the pin E moves its link to operate the lever E and the clutch rod G. Another device for operating the declutching rod comprises a pinion operated by the movement of the lever E to move a circular plate mounted on slides supported by the axle casing C , the clutch rod being connected to a strap encircling this plate. Another declutching arrangement, Fig. 13, shows the member B connected to the tractor by links S, S', a cushioning-device W -W being provided. Rods S are provided adjustably carrying cylinders S within which move pistons S on the ends of the rod S pivoted to extensions S of the axle casing. Springs S', S , strong enough to resist an ordinary pull, are interposed between the ends of the cylinders and the pistons. Bands S' free to rotate on the cylinders S , are connected by slotted links T, T and pins T , T , to members T rotatable on a shaft T carried by the extensions S . The shaft T carries a pinion engaging a rack on the clutch-operating rod.