Patent ID: 7832319
Filing Date: 2010-11-16
Classification: B23D,B26D,B27B,F16B,G05G,Y10S,Y10T

Abstract:
1. A blade clamp assembly for retaining a rotary blade on an arbor of a rotary tool, comprising: a blade washer for engaging the blade to hold the blade on the arbor; and a clamp assembly for being threaded into the arbor to clamp the blade washer against the blade, the clamp assembly including a body and a planetary gear system for transmitting torque applied to the clamp assembly to the blade washer, the planetary gear system including a sun gear and a planet gear, a bolt assembly retained within the body, the bolt assembly including a carrier and a threaded bolt attached to an arbor-side of the carrier and extending through the body for coupling the clamp assembly to the arbor; a cap coupled to the body, the sun gear attached to the cap and engaging the planet gear, wherein, upon the cap being turned, the sun gear rotates the planet gear for turning the bolt assembly, wherein the body includes a keyed bottom surface and the blade washer comprises a keyed upper surface for engaging the keyed bottom surface of the body, and wherein the planetary gear system multiplies the torque transmitted to the blade washer so that the torque transmitted to the blade washer is greater than the torque applied to the clamp assembly.