Patent ID: 7427008

Claim:
A fastening tool comprising: a housing; a motor assembly in the housing, the motor assembly including an output member and a motor for translating the output member; a knob rotatably mounted in the housing and defining knob teeth thereon; a pinion defining pinion teeth coupled for rotation with the knob teeth; an adjustment rod operatively coupled for movement with the pinion; a lower contact trip coupled to the adjustment rod, wherein depression of the lower contact trip causes the pinion to move along a pinion axis and the pinion teeth to slide along, and remain meshed for rotation with, the knob teeth without imparting rotation onto the knob; and an indexing member selectively biased into engagement with the knob to resist rotation of the knob relative to the housing; wherein rotation of the knob causes the contact trip to translate toward and away from the housing to define a desired penetration depth for the fastener.