| US 7,487,845 B2 | ||
| Safety mechanism for a rotary hammer | ||
| David A. Carrier, Aberdeen, Md. (US); Daniel Puzio, Baltimore, Md. (US); and Robert Bradus, Bel Air, Md. (US) | ||
| Assigned to Black & Decker Inc., Newark, Del. (US) | ||
| Filed on Apr. 28, 2008, as Appl. No. 12/150,459. | ||
| Application 12/150459 is a division of application No. 10/829994, filed on Apr. 22, 2004, granted, now 7,395,871. | ||
| Claims priority of provisional application 60/465064, filed on Apr. 24, 2003. | ||
| Prior Publication US 2008/0202786 A1, Aug. 28, 2008 | ||
| Int. Cl. B23B 45/02 (2006.01) | ||
| U.S. Cl. 173—2 [73/494; 73/514.04; 173/176; 173/183; 408/6] | 18 Claims |
| 1. A control system for a power tool having a motor drivably coupled to a rotary shaft to impart rotary motion to the shaft
about a rotational axis of the tool, comprising:
an inertial mass comprised of a solid cylindrical body disposed in a housing of the power tool, the inertial mass being freely
rotatable about its longitudinal axis and axially aligned with the rotational axis of the tool;
at least one sensing element in fixed relation to the housing of the power tool and configured to detect rotational motion
of the housing in relation to the inertial mass; and
a controller electrically connected to the at least one sensing element and operable to initiate a protective operation based
on the detected rotational motion of the housing in relation to the inertial mass.
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