Inventors:
Harlan Breeden - Bloomington IN
International Classification:
B21D 2802
Abstract:
A method and tool for joining a first metal structure, such as a sheet metal stud and a second metal structure, such as a sheet metal runner is disclosed. The tool includes a first clamp and a second clamp for moving with respect to each other to clamp the sheet metal therebetween. A linearly reciprocating punch being retrieved by a spring bias punches through the sheet metal to form a tongue for joining the sheets together. Angular relationships between the punching direction and the sheet metal are disclosed as well as a movable, yet lockable, inter-relationship between the clamping mechanism and the punching mechanism to allow a single stroke punching and clamping action.