Abstract: An exercise device for mounting on a conventional bicycle provides upper body exercise, the device having an auxiliary handlebar that rotates about a shaft on which is mounted a auxiliary power unit. Movement of the auxiliary handlebar in a rotational motion against resistive force provides exercise to the upper body of the user. The movement of the auxiliary handlebar by the user additionally provides auxiliary force by which the front wheel of the conventional bicycle can be driven in conjunction with or independently of the rear wheel drive mechanism.

Abstract: A device for sharpening band saw blades while the blade is in place. A grinding disc is propelled toward and away from the saw blade to grind the teeth. While the disc is being retracted, the band is moved one tooth spacing and held there by an indexing device so that the next tooth is in position to be ground. Adjustments are provided to accommodate different spacing of the teeth in different bands. The power unit for the grinder may be a common drill motor.