Blade Assembly Especially for an Ice Auger or Like

Abstract

A blade assembly including a shank and a bit head. The shank includes elements for mounting the bit head. The bit head includes one or more disk-shaped bit members, which rotate during a drilling/boring operation and which have an outer rim thereof working as an actual cutting face in drilling/boring. The rotary bit member included in the bit head is disposed at an angle of less than 45° relative to a drilled surface.

1 . A blade assembly, comprising
 a shank and   a bit head,   wherein the shank comprises elements for mounting the bit head, wherein the bit head comprises at least one disk-shaped bit member, which rotates during a drilling/boring operation and which has an outer rim thereof working as an actual cutting face in drilling/boring, and wherein the at least one bit member is disposed at an angle of less than 45° relative to a drilled surface.   
   
   
       2 . The blade assembly according to  claim 1 , wherein the shank comprises a structure, which projects in two or more directions and which has the at least one bit member mounted on its arm elements in a dismountable fashion, the blade assembly further comprising:
 arm elements projecting laterally from the shank in a substantially horizontal plane, the arm elements being shaped such that the angle of each bit member lies within the range of 5-30°relative to the drilled surface.   
   
   
       3 . The blade assembly according to  claim 1 , wherein the at least one bit member comprises means ( 4 ) for enhancing the drilling action, such as a corrugation, a serration and/or the like, present on its cutting face ( 2   a ′). 
   
   
       4 . The blade assembly according to  claim 1 , wherein the bit head comprises a pilot-hole boring central drill, which is coupled to the shank and the at least one bit member, which is disposed on at least one arm element coupled to the shank and which drills the outer edge for a hole to be bored/drilled. 
   
   
       5 . The blade assembly according to  claim 1 , wherein the at least one bit member has an inclination angle of 14.5° and/or an incidence/cutting angle of 15°. 
   
   
       6 . The blade assembly according to  claim 1  wherein the shank comprises means for adjusting the distance of the at least one bit member with respect to a center axis of the shank. 
   
   
       7 . The blade assembly according to  claim 6 , wherein the means for adjusting the distance of one or more bit members comprises an elongated attachment hole present in the shank. 
   
   
       8 . The blade assembly according to  claim 1 , wherein the at least one bit member is adapted to have a flexible attachment to the shank. 
   
   
       9 . The blade assembly according to  claim 1 , wherein the at least one bit member is manufactured in 1.5-3.5 mm gauge sheet steel, which is formed with a cutting face and/or means for enhanced drilling by die cutting. 
   
   
       10 . The blade assembly according to  claim 9 , wherein a bevel establishing the bit member's cutting face is surface ground to an angle of 25°. 
   
   
       11 . The blade assembly according to  claim 2 , wherein the at least one bit member is mounted on the arm elements of the structure using a screw connection. 
   
   
       12 . The blade assembly according to  claim 2 , wherein the angle of each bit member relative to the drilled surface is the inclination angle. 
   
   
       13 . The blade assembly according to  claim 4 , wherein the bit head comprises a twist bit. 
   
   
       14 . The blade assembly according to  claim 7 , wherein the elongated attachment hole is present in one or more arm elements of the shank. 
   
   
       15 . The blade assembly according to  claim 8 , wherein the flexible attachment to the shank enables self-adjustment of its cutting angle.