Abstract: Apparatus arranged for converting a wheeled vehicle to a tracked vehicle by attachment of a continuous track unit, the vehicle comprising a drive hub of the type which is arranged to have an attachable wheel, the continuous track unit replacing the wheel to engage ground in use for movement of the vehicle, the apparatus comprising a mounting portion releasably attachable to the vehicle's chassis, the mounting portion arranged to substantially surround the drive hub, a support arm for supporting the continuous track unit, and a drive sprocket releasably attachable to the drive hub for transferring torque from the drive hub to the continuous track unit so as to rotate the track in use with the wheel removed and the apparatus attached to the vehicle.

Abstract: It is known to retro-fit continuous track units to wheeled vehicles. This apparatus permits this to happen such that the continuous track units are securely attached and so that the vehicle can withstand shock loads and be operated over rough terrain without them becoming dislodged. This is effected by a first portion (240) attachable to the vehicle's chassis (75), the first portion arranged to substantially surround the drive hub (25), a second portion (250) including a support arm (280) for supporting the continuous track unit, the second portion releasably attachable to the first portion, and a drive sprocket (260) releasably attachable to the drive hub for transferring torque from the drive hub to the continuous track unit so as to rotate the track in use with the wheel removed and the apparatus attached to the vehicle.

Abstract: Continuously tracked vehicles such as tippers and bulldozers endure stresses and strains and it is desirable to reduce these stresses to extend their efficiency and life. A continuous track system is provided, comprising: a support structure supporting at least one jockey wheel and at least two tensioner wheels for supporting a track; two tensioners, one end of each tensioner being pivotably connected to the support structure, the two tensioner wheels being rotatably connected to an opposite end, for inducing tension in the track, wherein an axle of each tensioner wheel is pivotably connected by a link member to an axle of an adjacent jockey wheel; a controller for controlling the tensioners, wherein the controller maintains tension in the track by controlling the tensioners; a drive sprocket for rotation of the track; and a slew ring for attaching the support structure to a chassis of the vehicle.