Patent ID: 6988648

Claim:
An adjustable depth of drive device for use on a fastener driving tool having a housing structure which defines an axis and encloses a combustion chamber, and a nosepiece which extends axially from the housing structure along with a work piece contact element, comprising: a thumb post which is mounted to, and extends from the work piece contact element; a thumb wheel adjustably engaged on said thumb post; and a spring member in operational relationship with said thumb wheel in at least two positions, in a first position, said spring member is directly accessible and in frictionally biased engagement against said thumb wheel, said spring member in said frictionally biased engagement being configured for preventing unwanted movement of said thumb wheel yet being configured for permitting manual, bias-overcoming, rotatable fine adjustment of said thumb wheel relative to said thumb post, and in a second position, said spring member being directly accessible and disengagable from said thumb wheel to permit free rotation of said thumb wheel on said thumb post.