Patent ID: 8752301

Claim:
A chainsaw comprising: an accelerometer configured to generate three acceleration values, the three acceleration values being in three different directions, and each of the three acceleration values being based on an acceleration of the chainsaw; a comparison module configured to compare the three acceleration values to a predetermined acceleration threshold and configured to generate a risk signal based on the comparison, wherein the predetermined acceleration threshold comprises a first predetermined acceleration threshold, a second predetermined acceleration threshold, and a third predetermined acceleration threshold, and wherein the comparison module comprises a first comparator configured to compare a first of the three acceleration values to the first predetermined acceleration threshold, a second comparator configured to compare a second of the three acceleration values to the second predetermined acceleration threshold, and a third comparator configured to compare a third of the three acceleration values to the third predetermined acceleration threshold; and a circuit breaker coupled to the comparison module, the circuit breaker configured to trigger a kill switch in response to the risk signal, thereby deactivating the chainsaw in response to the risk signal.