Patent ID: 7506531

Claim:
A tool for forming a dimple on the edge of a sheet metal sheet to facilitate projection welding of the sheet to an adjacent metal sheet; comprising: a reversible drill motor having a housing and adjustable rotating chuck; a mounting bracket for clamping onto the housing of the drill motor; a base attached to the mounting bracket; a frame attached to the base and having spaced apart arms; a first dimple forming die mounted on one of the arms; a second dimple forming die slidably mounted on the other of the arms and having a threaded aperture therein; a driveshaft having a threaded end engaged in the threaded aperture of the second dimple forming die and having a drive end captured in the adjustable chuck of the drill motor; whereby rotation of the driveshaft in one direction to advance the second dimple forming die toward the first dimple forming die will form a dimple in a sheet edge interposed between the dies and then reversing the direction of rotation of the driveshaft in the other direction will withdraw the second dimple forming die away from the first dimple forming die.