Framing tool with automatic fastener-size adjustment

摘要

A tool has an improved nosepiece and shear block assembly (12) that drives a fastener (14) supplied from a plurality of fasteners. The assembly includes a nosepiece (22) that is configured for attachment to the tool and defines a portion of a barrel (24) and a shear block (40) configured to be secured to the nosepiece (22) to complete the barrel (24). There is an opening (30) in barrel has for receiving a fastener (14). The assembly also includes a biased fastener-size adjustment device (42), which exerts a biasing force against fasteners (14) adjacent the opening (30).