Radial and conical tools with compression band retainer

Abstract

Tool bit for non-rotatable mounting in a bore of a holder has a cutting head, a shoulder and a shank arranged axially along an axis of the tool bit. A groove is disposed circumferentially about a portion of the shank, and a compression band seated therein. Two or more grooves on the shank can include a non-metallic compression band and an optional o-ring. The compression bands/o-ring protrude past the outermost surface of the shank and, when the tool bit is positioned in a bore of a holder or sleeve, cause an outermost surface of the shank to be in non-contact with an inner diameter surface of the mounting bore and seal the space between the shank and the inner diameter surface of the bore to help prevent moisture and dust encountered during operation from getting between the tool and the holder.

What is claimed is: 
     
         1 . A tool bit for non-rotatable mounting in a bore of a holder, the tool bit comprising:
 a cutting head at a front end with a cutting tip;   a shank at a rear end;   a shoulder at a transition between the front end and the shank;   a groove disposed circumferentially about a portion of the shank; and   a compression band seated in the groove,   wherein the cutting head, shoulder and shank are arranged axially along an axis of the tool bit,   wherein an outermost surface of the shank is located, in a direction normal from the axis, at a first radial distance,   wherein at least a portion of an outermost surface of the compression band is located, in a direction normal from the axis, at a second radial distance, and   wherein the second radial distance is greater than the first radial distance.   
     
     
         2 . The tool bit of  claim 1 , wherein the tool bit includes two grooves, a first groove disposed circumferentially about a first portion of the shank and a second groove disposed circumferentially about a second portion of the shank, the first portion of the shank positioned axially rearward from the second portion of the shank. 
     
     
         3 . The tool bit of  claim 2 , wherein a compression band is seated in each of the two grooves. 
     
     
         4 . The tool bit of  claim 2 , wherein a compression band is seated in a first of the two grooves and an o-ring is seated in a second of the two grooves. 
     
     
         5 . The tool bit of  claim 1 , wherein the compression band is non-metallic. 
     
     
         6 . The tool bit of  claim 1 , wherein the compression band is formed from a compliant and resistant material. 
     
     
         7 . The tool bit of  claim 6 , wherein the compliant and resistant material consists essentially of nylon with embedded glass fibers. 
     
     
         8 . The tool bit of  claim 7 , wherein the embedded glass fibers are present at from 10 to 50 vol %. 
     
     
         9 . The tool bit of  claim 1 , wherein the tool bit is a conical tool bit or a radial tool bit. 
     
     
         10 . An assembly comprising:
 a holder having a first bore extending rearwardly from a forwardly oriented front face; and   a tool bit non-rotatably mounted in the first bore of the holder, the tool bit including a cutting head at a front end with a cutting tip, a shank at a rear end, a shoulder at a transition between the front end and the shank, a groove disposed circumferentially about a portion of the shank, and a compression band seated in the groove,   wherein the cutting head, shoulder and shank are arranged axially along an axis of the tool bit,   wherein an outermost surface of the shank is located, in a direction normal from the axis, at a first radial distance,   wherein at least a portion of an outermost surface of the compression band is located, in a direction normal from the axis, at a second radial distance, and   wherein the second radial distance is greater than the first radial distance.   
     
     
         11 . The assembly of  claim 10 , wherein at least a portion of the outermost surface of the shank is in non-contact with an inner diameter surface of the first bore. 
     
     
         12 . The assembly of  claim 11 , wherein a majority of the length of the shank is in non-contact with an inner diameter surface of the first bore. 
     
     
         13 . The assembly of  claim 10 , wherein the tool bit includes two grooves, a first groove disposed circumferentially about a first portion of the shank and a second groove disposed circumferentially about a second portion of the shank, the first portion of the shank positioned axially rearward from the second portion of the shank. 
     
     
         14 . The assembly of  claim 13 , wherein a compression band is seated in each of the two grooves. 
     
     
         15 . The assembly of  claim 14 , wherein an outermost surface of the shank is in non-contact with an inner diameter surface of the first bore along a majority of the length of the shank. 
     
     
         16 . The assembly of  claim 14 , including a space between the shank and the inner diameter surface of the bore, the space located axially between the compression band seated in the first groove and the compression band seated in the second groove. 
     
     
         17 . The assembly of  claim 13 , wherein a compression band is seated in a first of the two grooves and an o-ring is seated in a second of the two grooves. 
     
     
         18 . The assembly of  claim 17 , wherein an outermost surface of the shank is in non-contact with an inner diameter surface of the first bore along a majority of the length of the shank. 
     
     
         19 . The assembly of  claim 17 , including a space between the shank and the inner diameter surface of the bore, the space located axially between the compression band seated in the first groove and the o-ring seated in the second groove. 
     
     
         20 . The assembly of  claim 10 , wherein the compression band is non-metallic. 
     
     
         21 . The assembly of  claim 20 , wherein the compliant and resistant material consists essentially of nylon with embedded glass fibers.