Drill bit and core retaining device

Abstract

A core retaining device for use with a core drill bit, the bit adapted for cutting a core from a material. The core retaining device comprises: a core attachment mechanism for releasably connecting the core retaining device to the core; a bearing connected to the core attachment mechanism allowing the drill bit to rotate while said core attachment mechanism remains statically connected to the core; and a biasing arrangement operably connecting between the drill bit and the core via the bearing, axially biasing the core away from the material preventing the core from slipping from the drill bit.

1 . A core retaining device for use with a core drill bit, the core drill bit for cutting a core from a material and comprising a proximal cutting portion and a distal portion; the core retaining device comprising:
 a core attachment mechanism for releasably connecting the core retaining device to said core of said material;   a bearing connected to said core attachment mechanism allowing the drill bit to rotate while said core attachment mechanism remains statically connected to the core; and   a biasing arrangement operably connecting between the drill bit and the core via said bearing, axially biasing the core in the direction of said distal portion of the drill bit.   
     
     
         2 . A core retaining device for use with a core drill bit according to  claim 1 , wherein the biasing arrangement comprises:
 at least two biased ratcheting mechanisms disposed on said distal portion of the drill bit;   a member disposed within the confines of the drill bit and which is attached to the bearing core attachment mechanism; and   respective cables for each ratcheting mechanism, each cable operably connecting between each ratcheting mechanism and said member and the cables passing through apertures in the distal portion of the drill bit.   
     
     
         3 . A core retaining device for use with a core drill bit according to  claim 1 , wherein the biasing arrangement comprises a biasing means disposed within the confines of the drill bit and operably connecting between the drill bit and the core via the bearing. 
     
     
         4 . A core retaining device for use with a core drill bit according to  claim 1 , further comprising at least a pair of extensions extending essentially laterally outboard from the drill bit. 
     
     
         5 . A core retaining device for use with a core drill bit according to  claim 4 , wherein the extensions are attached to the distal portion of the drill bit. 
     
     
         6 . A core retaining device for use with a core drill bit according to  claim 1 , wherein the core attachment mechanism comprises an attachment plate. 
     
     
         7 . A core retaining device for use with a core drill bit according to  claim 3  wherein the biasing means is a spring. 
     
     
         8 . A core drill bit for cutting a core in a material, said core drill bit comprising:
 a proximal cutting portion;   a distal portion;   a core retaining device;   a core attachment mechanism for releasably connecting the core retaining device to said core of said material;   a bearing connected to said core attachment mechanism allowing the drill bit to rotate while said core attachment mechanism remains statically connected to the core; and   a biasing arrangement operably connecting between the drill bit and the core via said bearing, axially biasing the core in the direction of said distal portion of the drill bit.