Patent ID: 9522463
Filing Date: 2016-12-20
CPC Classification: B25C

Claim Text:
1. A compact, motorized fastening tool, comprising: a housing with a front, rear, top, bottom and sides; a fastener guide track along the bottom of the housing; a striker at the front of the housing including an upper striker position above the track and a lower striker position in front of the track; a motor supported on the housing toward a rear of the housing; a lever and power spring disposed at a front of the housing, the lever being linked to the striker at a front of the lever to lift the striker against a bias from the power spring, wherein the lever is elongated rearward along a length of the housing, and the power spring acting on the striker in majority through a torsional connection to cause a downward bias on the striker; a gear set disposed toward a center of the housing; a final gear is selectively linked to a rear of the lever to hold the lever in a rest condition against a pre-loaded bias of the power spring, the power spring storing energy to selectively drive the striker downward to produce an impact blow; wherein the motor is controlled to stop as the final gear moves the lever to be near the rest condition, and the rest condition of the lever includes a front of the lever near to a ceiling at the top of the housing with the striker in the upper position and a rear of the lever is in a lowered position, and a post-release condition of the lever wherein the front of the lever is moved down to be near to the track with the rear of the lever being in an upper position; wherein the motor is controlled to stop a gear of the gear set in a stop position before reaching an unstable toggle position against the lever, and the gear is selectively linked to a detent to limit the gear from rotating in reverse from a normal direction to maintain the lever in a rest condition; and wherein the power spring includes a first end movable with respect to the housing, the first spring end linked to the striker to move with the striker, a second spring end linked to the housing to press against the housing, and a structure of the power spring disposed between the first and second ends extending substantially behind the striker to lie between the final gear and the striker.