Patent ID: 6237827
Filing Date: 2001-05-29
Classification: B25C

Abstract:
A staple driving tool for stapling together two or more light gauge steel workpieces, said staple driving tool comprising a handle portion, a main body portion, a driver in said main body portion, a guide body beneath said main body portion having a bottom end and a drive track for said driver, a magazine containing a row of staples and being connected to said drive track, a staple advancing mechanism urging the forwardmost staple of said row into said drive track beneath said driver, a tool actuating trigger, and a safety, said safety being adapted to enable said trigger when said safety is pressed against a workpiece, a jaw assembly supporting an anvil, said jaw assembly being adapted to be selectably pivotable between a normal open position and a closed position wherein said steel workpieces to be joined are clamped between said anvil and said guide body bottom end prior to stapling, each staple of said row comprising a U-shaped staple having a pair of legs in parallel spaced relationship and connected by a crown, a member shiftable between a normal extended position across the lower portion of said drive track and a retracted position out of said drive track, such that during a stapling operation the forwardmost staple of said row approaches said steel workpieces under the urging of said driver and said staple legs straddle said member to prevent buckling of said legs tower each other until they have penetrated said steel workpieces, said drive track having walls precluding buckling of said staple legs in other directions, said member being so configured that it is shifted to said retracted position by said crown and driver enabling said driver and anvil to fully clinch said staple, said anvil comprising a top surface, a rectangular recessed staple-forming pocket located in said top surface of said anvil, said pocket having parallel end walls and parallel side walls extending perpendicularly from said anvil surface and a bottom surface curved between said pocket end walls, said pocket being skewed with respect to said anvil surface such that said pocket sides lie at an angle to the crown of a staple being formed therein, whereby said staple legs during clinching are bent curvalinearly by said curved pocket bottom toward said workpieces being joined and said staple legs are formed at an angle to said staple crown and are parallel to each other.