Seismic tool assembly for use in anchor insertion

Abstract

A seismic tool assembly for effecting a drill hole and enlarging a lowermost end thereof whereby an anchor can be set more securely therein. A drill bit is inserted through an opening in a stabilizer, which is positioned over a surface where the drill hole is to be made. The bit is placed into the drill hole, attaining a position at the lowermost end thereof. The lower end of the bit has a cutting portion having a cutting radius greater than that of the bit body whereby, when the bit is inserted fully into a lowermost end of the hole and rotated, the cutting portion enlarges the lowermost end of the hole, whereby flanged portions of an anchor will rest within the enlarged area, retaining the anchor in place. The stabilizer has a flanged portion extending into the hole, which provides a space between the bit and the stabilizer to permit limited tilting movement of the bit during drilling to enlarge a lowermost end of the hole, and for aiding in accurately inserting the bit into position.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
         1 . A seismic tool assembly for effecting a drill hole and enlarging a lowermost end thereof for a later insertion and setting of anchors therein, the assembly comprising:
 a substantially cylindrical bit body sized to fit into the drill hole, the bit body having a first end region constructed and arranged to be operatively connected to a drill and a second end region disposed generally opposite said first end region, wherein a cutting portion is positioned to protrude from at least one side of the second end region, the cutting portion having an operational cutting radius greater than a cutting radius of the bit body;   a stabilizer having an opening defined therethrough and being constructed and arranged for mounting within at least a portion of the drill hole, the opening corresponding with the drill hole and for receiving an insertion of the bit body into the drill hole; and   a drill stop member mounted upon the stabilizer and having a central opening corresponding with each of the openings of the stabilizer and the drill hole, the drill stop member restricting downward drilling movement of the bit body into the drill hole to a pre-set depth.   
     
     
         2 . The assembly as claimed in  claim 1 , wherein the cutting radius of the bit body is substantially equal to a diameter of the drill hole. 
     
     
         3 . The assembly as claimed in  claim 1 , wherein the cutting radius of the bit body is substantially equal to one-half a diameter of the drill hole. 
     
     
         4 . The assembly as claimed in  claim 1 , wherein the cutting portion extends outwardly from substantially around an entirety of the second end region. 
     
     
         5 . The assembly as claimed in  claim 1 , wherein the at least one cutting edge and the at least one groove extend along a substantial length of the bit body. 
     
     
         6 . The assembly as claimed in  claim 1 , wherein the at least one cutting edge and the at least one groove extend along at least half a length of the bit body. 
     
     
         7 . The assembly as claimed in  claim 1 , wherein the cutting portion is integrally connected to the bit body. 
     
     
         8 . The assembly as claimed in  claim 1 , wherein the drill bit is constructed and arranged for attachment to a power drill. 
     
     
         9 . The assembly of  claim 1 , wherein the drill bit has at least one cutting edge and at least one groove extending in a helical fashion along a length of the bit body. 
     
     
         10 . The assembly of  claim 1 , wherein the second end region of the drill bit has a tapered end and a drill tip extending generally outwardly from the tapered end. 
     
     
         11 . The assembly of  claim 1 , wherein the opening in the stabilizer is positioned at a substantially central location of the stabilizer. 
     
     
         12 . The assembly of  claim 1 , wherein an outermost diameter of the stabilizer is greater than a diameter of the drill hole. 
     
     
         13 . The assembly of  claim 1 , wherein the drill stop member is held in position on the stabilizer by at least one magnet positioned between the drill stop member and the stabilizer. 
     
     
         14 . The assembly of  claim 11 , wherein the opening in the substantially central location of the stabilizer is recessed from an upper surface of a remainder of the stabilizer. 
     
     
         15 . The assembly of  claim 1 , wherein the stabilizer further comprises a flange portion constructed and arranged to extend into the drill hole and abut an inside portion thereof, the flange portion providing a space between the bit body and the stabilizer to permit limited tilting movement of the bit body to enlarge a lowermost end of the drill hole. 
     
     
         16 . The assembly of  claim 15 , wherein the flange portion is tapered at a distal end thereof. 
     
     
         17 . The assembly of  claim 1 , wherein the bit body is tapered, an upper end of the bit body having a narrower circumference than that of the lowermost end of the bit body. 
     
     
         18 . A seismic anchor insertion assembly for insertion into a drill hole to effect placement of an anchor, the assembly comprising:
 a substantially cylindrical bit body sized to fit into the drill hole, the bit body having a first end region constructed and arranged to be operatively connected to a drill and a second end region disposed generally opposite said first end region, wherein a cutting portion is positioned to protrude from at least one side of the second end region, the cutting portion having an operational cutting radius greater than a cutting radius of the bit body;   a stabilizer having an opening defined therethrough corresponding with the drill hole for receiving an insertion of the bit body into the drill hole, the stabilizer having a flange portion constructed and arranged to extend into the drill hole and abut an inside portion thereof, the flange portion providing a space between the bit body and the stabilizer to permit limited tilting movement of the bit body to enlarge a lowermost end of the drill hole; and   a drill stop member mounted upon the stabilizer and having a central opening corresponding with each of the openings of the stabilizer and the drill hole, the drill stop member restricting downward drilling movement of the bit body into the drill hole to a pre-set depth.   
     
     
         19 . The assembly of  claim 18 , wherein the flange portion is tapered at a distal end thereof. 
     
     
         20 . The assembly of  claim 18 , wherein the assembly further comprises a percussion adapter constructed and arranged for connection to the first end region of the bit body.