Triple edge trenching axe

Abstract

A head for a trenching axe has a central eye portion with an eye opening for joining a handle to extend in a first direction and a height in the first direction, a grubbing blade joined to the eye portion, extending away from the eye portion, and having a cutting edge on an end away from the eye portion, the cutting edge facing in a direction substantially orthogonal to the first direction, a first sidewall joined to the grubbing blade along a portion of a first long edge of the grubbing blade, and a second sidewall joined to the grubbing blade along a portion of a second long edge of the blade, the first and second sidewalls each presenting a sharpened edge at substantially a right angle to the cutting edge of the grubbing blade, and a back wall joined to the grubbing blade and the first and second sidewalls, the sidewalls, the grubbing blade and the back wall forming a pocket open toward the cutting edge of the grubbing blade.

1 . A head for a trenching axe, comprising: 
 a central eye portion having an eye opening for joining a handle to extend in a first direction and a height in the first direction;    a grubbing blade joined to the eye portion, extending away from the eye portion, and having a cutting edge on an end away from the eye portion, the cutting edge facing in a direction substantially orthogonal to the first direction;    a first sidewall joined to the grubbing blade along a portion of a first long edge of the grubbing blade, and a second sidewall joined to the grubbing blade along a portion of a second long edge of the blade, the first and second sidewalls each presenting a sharpened edge at substantially a right angle to the cutting edge of the grubbing blade; and    a back wall joined to the grubbing blade and the first and second sidewalls, the sidewalls, the grubbing blade and the back wall forming a pocket open toward the cutting edge of the grubbing blade.    
   
   
       2 . The trenching axe head of  claim 1  wherein the back wall is a surface of the eye portion, and the sidewalls extend from the grubbing blade to the height of the eye portion.  
   
   
       3 . The trenching axe head of  claim 1  wherein the back wall is separate from the eye portion.  
   
   
       4 . The trenching axe head of  claim 1  wherein the grubbing blade extends from the eye portion further than the extent of the sidewalls from the eye portion.  
   
   
       5 . The trenching axe head of  claim 1  wherein the back wall is a surface of the eye portion, and the sidewalls extend from the grubbing blade to a height substantially greater than the height of the eye portion.  
   
   
       6 . The trenching axe head of  claim 1  wherein each sidewall has a sharpened edge extending from the grubbing blade to the back wall.  
   
   
       7 . The trenching axe head of  claim 1  further comprising a pick end extending from the eye portion in a direction opposite the extension direction of the grubbing blade.  
   
   
       8 . A trenching axe comprising: 
 a head having a central eye portion having an eye opening for joining a handle to extend in a first direction and a height in the first direction, a grubbing blade joined to the eye portion, extending away from the eye portion, and having a cutting edge on an end away from the eye portion, the cutting edge facing in a direction substantially orthogonal to the first direction, a first sidewall joined to the grubbing blade along a portion of a first long edge of the grubbing blade, and a second sidewall joined to the grubbing blade along a portion of a second long edge of the blade, the first and second sidewalls each presenting a sharpened edge at substantially a right angle to the cutting edge of the grubbing blade, and a back wall joined to the grubbing blade and the first and second sidewalls, the sidewalls, the grubbing blade and the back wall forming a pocket open toward the cutting edge of the grubbing blade; and    a handle inserted firmly in the eye opening such that the head is joined to the handle at an end of the handle.    
   
   
       9 . A trenching attachment for a pick axe having a grubbing blade, the attachment comprising; 
 a first and a second sidewall joined to opposite edges of a mounting plate having the shape and width of the grubbing blade, the first and second sidewalls each having a sharpened edge;    a back plate joined to both sidewalls and the mounting plate; and    an attachment mechanism for attaching the trenching attachment to a head of a pick axe.