Importance

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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. Thus, when the cylinder rod is forced outwardly of the cylinder, the drive shaft is actuated outwardly forcing the articulated arms inwardly wherein the crimping teeth crimp the cornerbead and secure the cornerbead onto a wallboard corner. The handle includes a flow opening so that subsequent to a driving stroke, the spring actuated piston can return to its normal position and the air present in the cylinder may exit through the flow opening in the handle. Preferably, the V-shaped head also includes a semi-cylindrical cut-out for crimping rounded cornerbead.

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First Claim