Abstract: Apparatus for removing obstructions from pipelines, such as sewers, comprises support means, motor means carried by the support means, cutter means adapted to be operated by the motor means, and means for locking the support means in a pipe, adjacent an obstruction whereby the apparatus may be locked in a predetermined position, and the motor means operated to drive the cutter means and remove the obstruction. The motor means may comprise an hydraulic motor. The cutter means may be a rotary saw. The means for locking the support means in position may comprise at least one hydraulic jack.

Abstract: There is disclosed a conversion unit for attachment to an all terrain vehicle to convert it into a track laying vehicle. A subframe is attached to the rear of the track laying vehicle, and two idler wheels are mounted on the subframe. Spring strut means extend downwardly from an upper portion of the vehicle to the subframe and bias the latter downwardly. The unit is quickly and easily attached to an all terrain vehicle and as easily removed. It is possible to improve the luggage carrying capacity of the all terrain vehicle and to improve its safety. No special tools are required for installation or dismounting of the unit.