Abstract: A cornerbead crimping tool for crimping cornerbead to wallboard is presented which comprises in a first embodiment a handle portion, an intermediate air cylinder portion and a crimping head portion which together form the crimping tool. In accordance with a second and preferred embodiment of the present invention, the crimper tool of the present invention is a user configurable system comprising a housing module, a plurality of interchangeable crimper modules and a plurality of interchangeable power modules (e.g., pneumatic operation and manual operation). The resultant system provides the cornerbead applicator with the ability to quickly and easily crimp cornerbead of any known size or shape using either a manual (e.g., hammer) operation or pneumatic operation. All of the system parts are made from molded reinforced plastic and due to the modular, interchangeable construction lead to ease of manufacture as well as low cost assembly.

Abstract: A cornerbead crimping tool for crimping cornerbead to wallboard is presented which comprises in a first embodiment a handle portion, an intermediate air cylinder portion and a crimping head portion which together form the crimping tool. In accordance with a second and preferred embodiment of the present invention, the crimper tool of the present invention is a user configurable system comprising a housing module, a plurality of interchangeable crimper modules and a plurality of interchangeable power modules (e.g., pneumatic operation and manual operation). The resultant system provides the cornerbead applicator with the ability to quickly and easily crimp cornerbead of any known size or shape using either a manual (e.g., hammer) operation or pneumatic operation. All of the system parts are made from molded reinforced plastic and due to the modular, interchangeable construction lead to ease of manufacture as well as low cost assembly.

Abstract: A router attachment for adapting a conventional screw gun for cutting sheets of drywall material includes a housing that is removably securable to the housing of the screw gun, an input shaft rotatably mounted in the housing for coupling with the screwdriver shaft of the screw gun, an output shaft rotatably mounted in the housing for coupling with a router bit and a step-up gear assembly for associating the input and output shafts so that rotation of the input shaft at a first rate of rotation drives rotation of the output shaft at a second, higher rate of rotation.

Abstract: A cornerbead crimping tool for crimping cornerbead to wallboard is presented which comprises a handle portion, an intermediate air cylinder portion and a crimping head portion which together form the crimping tool. The handle portion includes a trigger which, when actuated, delivers high pressure fluid (typically air) through a valve to a cylinder which includes a spring actuated piston therein. The piston is actuated by the high pressure air from the handle so that the piston rod is driven forward to an opening in the cylinder and into the crimping head portion. The crimping head includes a rigid housing having a V-shaped end for engagement to the cornerbead. A drive shaft is mounted in an opening within the housing and it is engaged by the piston rod. The drive shaft is pivotedly attached to articulated arms which terminate at crimping teeth.