Patent ID: 7997171

Claim:
An attachment for a separate portable fastener-driving tool, said attachment comprising: (a) a housing having a mating end that allows it to mount to a separate portable fastener-driving tool, said housing also having an actuation end; (b) a movable first member extending from said actuation end of the housing, said first member having a first distal end; and (c) a movable second member extending from said first distal end of the first member, said second member having a second distal end; wherein: (d) in a first, non-actuated state, said second distal end of the second member is substantially at a predetermined first distance with respect to said actuation end of the housing; and (e) when said second distal end of the second member is pressed against a surface of an external solid object, said second member begins to move relative to said housing, and: (i) said second member travels through a first stage of movement from said predetermined first distance, and moves relative to said first member, while said first member is substantially prevented by a first mechanism from moving relative to said housing until said second distal end of the second member reaches substantially a predetermined second distance with respect to said actuation end of the housing; and (ii) then said second member travels through a second stage of movement past said predetermined second distance, and said first member moves relative to said housing while overcoming said first mechanism, until said second distal end of the second member reaches substantially a predetermined third distance with respect to said actuation end of the housing, which substantially completes the movement of said second member; wherein said predetermined first distance is greater than said predetermined second distance, and said predetermined second distance is greater than said predetermined third distance; and wherein: (f) said first mechanism comprises a leaf spring that prevents substantial movement of said first member toward said housing until the first stage movement of said second member is substantially completed; (g) said leaf spring is mounted to said housing, and is positioned in a slot in a surface of said first member when said first member and said second member are in their non-actuated states; (h) during the first stage movement of said second member, and until the first stage movement is substantially completed, said leaf spring makes contact against said first member and thereby substantially prevents said first member from moving with respect to said housing; and (i) once the first stage movement of said second member is substantially completed, said leaf spring is bumped away from said slot, and thereby no longer substantially prevents said first member from moving with respect to said housing.