Patent ID: 8919231
Filing Date: 2014-12-30
Classification: B23D,B27B,Y10T

Abstract:
1. A table saw comprising: a cutting surface; a motor-driven, rotatable blade for cutting a workpiece on the cutting surface, wherein a portion of the blade is extendable above the cutting surface; detection means for detecting a dangerous condition relative to the blade; reaction means in communication with the detection means for taking a reaction in response to detection of the dangerous condition by the detection system; and a blade-spin detection system, different from the detection means and the reaction means, for detecting whether the blade is rotating based on energy from the blade, wherein the blade-spin detection system is in communication with the reaction means and provides an output to arm the reaction means when the blade-spin detection system detects that the blade is spinning so that the reaction means is armed to take the response when triggered by the detection means.