Patent ID: 6881016
Filing Date: 2005-04-19
Classification: B23B,Y10T

Abstract:
1. A core retainer adapted for use with a core drill bit, the core drill bit for separation of a core from a material surface, said retainer comprising: a base plate; means for connecting said base plate to the material surface; a plurality of arms mounted to said base plate, each arm having a first end and a second end; means for linking movement of each said arm to said base plate, whereupon a movement of said base plate moves said arms; a brake pad at said first end of each said arm, said brake pad adapted to engage an interior surface of the core drill bit; a rotatable drilling of the core drill bit into the material surface producing a separated core in movement from the material surface, the separated core movement moving said base plate connected thereto, said base plate movement moving said arms linked thereto to a position wherein to urge said brake pads against the interior surface of the core drill bit at a pressure to hold said retainer and separated core with the core drill bit, whereby a displacement of the core drill bit from the material surface displaces the separated core therefrom.