Agricultural tractor with draft load sensing springs for power lift control
AssigneeDavid Brown Tractors Limited
InventorsStephen Moorhouse, Harry Horsfall, Alan Rangeley Dean
Life of this patent
Estimating the term…
Abstract
A tractor has a power lift mechanism controllable automatically in known manner by implement draft load sensing apparatus. This apparatus comprises two leaf springs which are spaced apart in a lateral direction relative to the tractor, the springs being connected at their front ends to the tractor and being adapted to flex in the lateral direction but being stiff longitudinally of the tractor and vertically; two hitch links each connected to the rear end of one of the springs; and equipment for transmitting to the power lift mechanism a control signal derived from any variation in the distance between the flexible portions of the springs.
Claims11
An argicultural tractor having means for sensing implement draft load and a power lift mechanism controllable by said means, wherein the means for sensing implement draft load comprise two parallel leaf springs which are spaced apart in a lateral direction relative to the tractor, said spring being rigidly anchored at their spaced apart front ends to the frame of the tractor and having flexible portions adapted to flex in said direction, two connector means each of which is fixed to the rear end of one of the springs, two hitch links each of which is connected to one of the connector means, the arrangement being such that a draft load applied to a link causes flexing of the associated spring in said direction, and means for transmitting to the power lift mechanism a signal derived from any variation in the distance between the flexible portions of the springs.
An agricultural tractor having means for sensing implement draft load and a power lift mechanism controllable by said means, wherein the means for sensing implement draft load comprise two parallel leaf springs which are spaced apart in a lateral direction relative to the tractor, said springs being rigidly anchored at their spaced apart front ends to the frame of the tractor and having flexible portions adapted to flex in said direction, two hitch links each of which is connected to the rear end of one of the springs, the arrangement being such that a draft load applied to a link causes flexing of the associated spring in said direction, a hollow projection on the frame of the tractor disposed between the springs, and means housed in said projection for transmitting to the power lift mechanism a signal derived from any variation in the distance between the flexible portions of the springs.
Dependencies are inferred from the claim text.