Multiple axle trailers
First Claim
1. A multiple axle trailer comprisinga sub-chassis fitted with at least first and second axles, a chassis supported on the sub-chassis to pivot relative to the sub-chassis and provided with means at its forward end to enable the trailer to be pivotally mounted to a towing vehicle, a pair of wheels on each of said at least first and second axles, the pair of wheels on the first axle able to turn with respect to the first axle about respective pivot points,said trailer includinga steering arm pivotally connected to the sub-chassis at a first pivot, and to the chassis at a second pivot, and connected to pivot relative to the sub-chassis when the chassis is caused to pivot relative to the sub-chassis, the length of the steering arm being adjustable to compensate for changes in the distance between the first and second pivots during operation;
- a mounting point movable with the steering arm, a respective pivot point associated with each of the wheels of said first axle,and a system of linkages connected between the pivot point of each wheel of said first axle and the mounting point, the linkages being connected to steer the wheels of the first axle in response to the pivotal position of the steering arm relative to the sub-chassis.
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Accused Products
Abstract
A multiple axle trailer comprises a chassis pivotally connected to turn substantially horizontally with respect to a sub-chassis and provided with means at its forward end to enable the trailer to be hitched to a towing vehicle, the sub-chassis carrying forward and rear pairs of wheels. An adjustable length steering arm is pivotally connected to the sub-chassis and to the chassis forward of the connection to the sub-chassis. A system of linkages connects the forward wheel king pins with a mounting point which is rotationally fixed with respect to the steering arm and operates to turn the forward wheels from the steering arm so that the trailer tracks the towing vehicle. In a preferred embodiment the mounting point is moveable longitudinally to enable the forward wheels to be moved in the opposite direction during reversing of the trailer.
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Citations
14 Claims
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1. A multiple axle trailer comprising
a sub-chassis fitted with at least first and second axles, a chassis supported on the sub-chassis to pivot relative to the sub-chassis and provided with means at its forward end to enable the trailer to be pivotally mounted to a towing vehicle, a pair of wheels on each of said at least first and second axles, the pair of wheels on the first axle able to turn with respect to the first axle about respective pivot points, said trailer including a steering arm pivotally connected to the sub-chassis at a first pivot, and to the chassis at a second pivot, and connected to pivot relative to the sub-chassis when the chassis is caused to pivot relative to the sub-chassis, the length of the steering arm being adjustable to compensate for changes in the distance between the first and second pivots during operation; -
a mounting point movable with the steering arm, a respective pivot point associated with each of the wheels of said first axle, and a system of linkages connected between the pivot point of each wheel of said first axle and the mounting point, the linkages being connected to steer the wheels of the first axle in response to the pivotal position of the steering arm relative to the sub-chassis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification