Patent ID: 8668027

Claim:
A power tool comprising: a drive motor; a drive belt guided about a drive pulley and an output pulley; a tool driven by said drive motor through said drive belt; a tensioning device adapted to change a spacing between said drive pulley and said output pulley and having at least one tensioning position and at least one release position, wherein said drive pulley and said output pulley in said at least one tensioning position have a first spacing relative to one another and in said at least one release position have a second spacing to one another that is smaller than said first spacing; wherein said drive belt is an elast belt and wherein said tensioning device as a result of an inherent tension of said elast belt is secured in said at least one tensioning position; wherein, for release of said tensioning device, said tensioning device is actuated against the force of said elast belt; wherein said tensioning device has a tensioning element acting on a pressure element, wherein one of said tensioning element and said pressure element is connected to a housing of the power tool and the other one of said tensioning element and said pressure element is arranged on a movable section of an extension arm of the power tool; wherein said tensioning element is an eccentrically and rotatably supported cam; wherein said tensioning element in said at least one tensioning position acts on said pressure element; and wherein said tensioning element, when moving said tensioning device from said at least one tensioning position into said at least one release position, acts on said pressure element such that said first spacing between said drive pulley and said output pulley is enlarged and said elast belt is further tensioned before said second spacing between said drive pulley and said output pulley is reached.