| 摘要 |
An apparatus for joining sheets of material employs a die assembly having an anvil peripherally bordered by a plurality of movable die segments and a spring which urges the die segments radially toward the anvil. In a further aspect of the present invention, the spring is a coiled and canted spring. In another aspect of the present invention, the spring secures the die segments within an outer sleeve. In yet another aspect of the present invention, a unique die retainer has provisions for retaining a die assembly and for fastening such to a work surface. |
