US Patent 7757920 Combustion nailer workpiece contact element with enhanced gripping

A combustion-powered driving tool for propelling fasteners into a workpiece includes a housing, a power source located in the housing, a nosepiece associated with a lower end of the power source, a magazine associated with the housing and constructed and arranged for storing and sequentially feeding a plurality of fasteners to the nosepiece, and a workpiece contact element associated with the nosepiece and including at least one tooth extending from the workpiece contact element and being constructed and arranged for engaging the workpiece to enable the tool to actuate when the magazine is arranged generally parallel to the workpiece.