Patent ID: 8562395
Filing Date: 2013-10-22
Classification: B24B,Y10T

Abstract:
1. A system comprising: a hand-held power tool having a tool housing, a receiving unit fixed to the tool housing, the receiving unit including a drive shaft connectable at a free end to a rotatable tool; a guard unit connected with the hand-held power tool, the guard unit including a guard extending at least partially around the rotatable tool; and a guard anti-rotation lock device including a clamping band fixedly connected to the guard, the clamping band establishing a frictional connection between the guard unit and the receiving unit to position the guard in a non-rotational manner with respect to the tool housing during hand-held power tool operation, wherein the receiving unit further includes a receiving flange and a connecting element that are together surrounded by and clamped by the clamping band to form a clamping region with a cross sectional area to effect the frictional connection between the guard unit and the receiving unit, wherein the guard anti-rotation lock device is configured to counteract a rotational movement of the guard occurring in a case where a rotating tool bursts and a piece of the burst tool is slung outwardly, strikes the guard and transfers rotational kinetic energy from the striking piece to the guard in an amount sufficient to overcome the friction connection and effect the rotational movement, wherein the rotational movement causes rotation of the connecting element, which connecting element rotation increases the cross-sectional area of the clamping region, and wherein the increased cross-sectional area of the clamping region increases an amount of frictional force imparted by the clamping band on the receiving unit defined by the frictional connection thereby effecting the guard rotational movement counteraction.