Patent ID: 8776657
Filing Date: 2014-07-15
Classification: B27B,Y10T

Abstract:
1. A blade mounting assembly for mounting a rotary blade to an arbor, the arbor defining a shoulder and a spindle, and the rotary blade defining a bore therethrough and having a right side face facing the shoulder and a left side face facing away from the shoulder, the bore having a perimeter wall that defines a perimeter shape with a keyed portion, said mounting assembly comprising: an outer washer including; a fastener configured for fastening said outer washer to the arbor with said locating surface in contact with the shoulder; and a biasing element configured to be disposed over said hub between the shoulder and the right side face of the blade when said hub extends through the bore of the rotary blade, the biasing element being configured to bias the rotary blade away from the shoulder such that left side face of the rotary blade is positioned in contact with the engagement surface of the outer washer; wherein the locating surface of the hub of the outer washer is configured to space the engagement surface a fixed axial distance apart from the shoulder when the locating surface is positioned in contact with the shoulder with the spindle extending through the central bore of the hub, wherein the fixed axial distance is greater than a thickness of the rotary blade between the left side face and the right side face such that, when the biasing element biases the left side face of the rotary blade into contact with the engagement surface, the right side face of the rotary blade is spaced apart from the shoulder.