Abstract: A belt tension system for a power tool such as a demolition saw. The system includes a driven gear and a drive gear. The drive gear is orientated perpendicular to the driven gear for more convenience access to adjust the driven gear and, hence, adjust the drive belt. The driven gear can include a second member movably connected to a first member. The second member has a threaded portion and a shaft portion. The first member has helical grooves to interact with the drive gear and a center hole with the second member shaft portion slidingly located therein. The first member can axially rotate the second member when it is axially rotated.

Abstract: A hood for a power tool, such as a grinding wheel on a saw, in which the hood is rotatable relative to the frame of the tool. The tool has a system for repositionably fixing the hood at selected locations. The system includes a detent connected to the hood with a plurality of lock notches and a longitudinally movable lock pin connected to the frame. The lock pin can be positioned into one of the detent notches to prevent the hood from moving and, can be longitudinally moved to disconnect the lock pin from the detent thus allowing the hood to be repositioned. The system includes a knob to axially rotate the lock pin, a cam member to longitudinally move the lock pin upon axial rotation, and a leaf spring to bias the lock pin in an engaged lock position with the hood detent.

Abstract: A blade guard system for power driven rotary saws having a drive shaft arm rotatable between inboard and outboard cutting positions relative to the chassis, a blade guard disposed about a portion of the saw blade and rotatably attached to the saw blade shaft. An arcuate track slot is disposed on the inner wall of the blade guard adjacent to the drive shaft arm. A blade guard adjust arm is pivotally mounted at one end to the drive shaft arm and the other end of the blade guard adjust arm being releasably attachable at selected locations along the track slot to position the blade guard in desired protective positions. When the blade guard adjust arm is released from the track slot, rotation of the blade guard and the blade guard adjust arm to selected protective positions is permitted without the need to remove the blade guard or blade from the saw blade shaft.