Spring Biased Rotatable Tool

Abstract

A rotatable tool has a tool body that is generally symmetrical about a longitudinal axis, an enlarged cutting head, and a rearwardly extending shank. The shank joins the enlarged cutting head at an annular flange. A compressible sleeve is fitted around the shank and a wear ring is around the shank at the forward end of the sleeve. A disc spring is positioned between the radial flange and the sleeve to remove axial play between the shank and the sleeve and to seal the parts so that hard particles cannot enter and interfere with rotation of the tool.

1 . A rotatable tool comprising
 a tool body having a longitudinal axis, an enlarged cutting head and a cylindrical shank extending rearwardly of said enlarged cutting head,   a hardened tip at a forward end of said enlarged cutting head,   said shank joining said enlarged cutting head at an annular flange,   said cylindrical shank having an annular shoulder thereon,   an annular retainer sleeve on said shank,   said retainer sleeve contacting said annular shoulder for retaining said retaining sleeve to said shank,   said retainer sleeve also having a forward end, and   a disc spring on said shank axially behind said annular flange.   
     
     
         2 . The rotatable tool of  claim 1  and further comprising
 a wear ring also on said shank behind said annular flange. 
 
     
     
         3 . The rotatable tool of  claim 1  wherein
 said disc spring is between said forward end of said retainer sleeve and said annular flange, 
 said retainer sleeve has a compressed diameter for retaining said shank in a bore of a tool holder, and 
 said disc spring has a central opening with a diameter less than said compressed diameter wherein said disc spring urges said retainer sleeve against said annular shoulder. 
 
     
     
         4 . The rotatable tool of  claim 1  and further comprising
 a second disc spring on said shank. 
 
     
     
         5 . The rotatable tool of  claim 1  wherein
 said shank has a maximum radius R 1 , 
 said annular flange has an annular inner portion joining a forward end of said shank and an outer portion extending to a maximum diameter of said annular flange, 
 said annular flange having a maximum radius R 3 , 
 said annular inner portion being axially forward of said annular outer portion, and 
 a boundary between said inner portion and said outer portion having a radius that is generally midway between R 1  and R 3 . 
 
     
     
         6 . The rotatable tool of  claim 5  wherein said disc spring has an outer diameter at least equal to an outer diameter of said flange. 
     
     
         7 . The rotatable tool of  claim 6  wherein
 said disc spring is between said forward end of said retainer sleeve and said annular flange, 
 said retainer sleeve has a compressed diameter for retaining said shank in a bore of a tool holder, and 
 said disc spring has a central opening with a diameter less than said compressed diameter wherein said disc spring urges said retainer sleeve against said annular shoulder. 
 
     
     
         8 . A rotatable tool comprising
 a tool body having a longitudinal axis, an enlarged cutting head and a cylindrical shank extending rearwardly of said enlarged cutting head,   a hardened tip at a forward end of said enlarged cutting head,   said shank joining said enlarged cutting head at an annular flange,   said cylindrical shank having an annular shoulder thereon,   an annular retainer sleeve on said shank,   said retainer sleeve having means for contacting said shoulder for retaining said retaining sleeve to said shank,   said retainer sleeve having means for contacting said shoulder for retaining said retaining sleeve to said shank,   said retainer sleeve also having a forward end,   a disc spring between said forward end of said retainer sleeve and said annular flange wherein said disc spring urges said retainer sleeve against said annular shoulder.   
     
     
         9 . The rotatable tool of  claim 8  and further comprising
 a wear ring around said shank, and 
 said wear ring having a surface contacting said disc spring. 
 
     
     
         10 . The rotatable tool of  claim 8  wherein
 said disc spring is between said forward end of said retainer sleeve and said annular flange, 
 said retainer sleeve has a compressed diameter for retaining said shank in a bore of a tool holder, and 
 said disc spring has a central opening with a diameter less than said compressed diameter wherein said disc spring urges said retainer sleeve against said annular shoulder. 
 
     
     
         11 . The rotatable tool of  claim 8  and further comprising
 a second disc spring on said shank. 
 
     
     
         12 . The rotatable tool of  claim 8  wherein
 said shank has a maximum radius R 1 , 
 said annular flange has an annular inner portion joining a forward end of said shank and an outer portion extending to a maximum diameter of said annular flange, 
 said annular flange having a maximum radius R 3 , 
 said annular inner portion being axially forward of said annular outer portion, and 
 a boundary between said inner portion and said outer portion having a radius that is generally midway between R 1  and R 3 . 
 
     
     
         13 . The rotatable tool of  claim 12  wherein said disc spring has an outer diameter at least equal to an outer diameter of said flange. 
     
     
         14 . The rotatable tool of  claim 13  wherein
 said disc spring is between said forward end of said retainer sleeve and said annular flange, 
 said retainer sleeve has a compressed diameter for retaining said shank in a bore of a tool holder, and 
 said disc spring has a control opening with a diameter less than said compressed diameter wherein said disc spring urges said retainer sleeve against said annular shoulder. 
 
     
     
         15 . The combination comprising
 a rotatable tool including   a tool body having a longitudinal axis, an enlarged cutting head and a cylindrical shank extending rearwardly of said enlarged cutting head,   a hardened tip at a forward end of said enlarged cutting head,   said shank joining said enlarged cutting head at an annular flange,   said cylindrical shank having an annular shoulder thereon,   an annular retainer sleeve surrounding said shank,   said retainer sleeve contacting said shoulder and retaining said retaining sleeve to said shank,   said retainer sleeve also having a forward end,   a tool holder having a forward surface and an axial bore,   said shank and said retainer sleeve inserted into said axial bore, and   a spring disc around said shank and between said annular flange and said forward surface of said tool holder.   
     
     
         16 . The combination of  claim 15  wherein
 an inner opening of said disc spring has a diameter less than a diameter of said axial bore and an inner portion of said disc spring contacts said retainer sleeve and urges said retainer sleeve into said bore. 
 
     
     
         17 . The rotatable tool of  claim 15  and further comprising
 a wear ring around said shank and also positioned between said annular flange and said forward surface of said tool holder. 
 
     
     
         18 . The combination of  claim 15  wherein
 one of said wear ring and said disc spring has an inner opening with a diameter less than a diameter of said axial bore, and 
 said one of said wear ring and said disc spring contacts said retainer sleeve wherein said retainer sleeve is urged into said bore by said one of said wear ring and said disc spring. 
 
     
     
         19 . The combination of  claim 15  wherein
 said shank has a maximum radius R 1 , 
 said annular flange has an annular inner portion joining a forward end of said shank and an outer portion extending to a maximum diameter of said annular flange, 
 said annular flange having a maximum radius R 3 , 
 said annular inner portion being axially forward of said annular outer portion, and 
 a boundary between said inner portion and said outer portion having a radius that is generally midway between R 1  and R 3 . 
 
     
     
         20 . The combination of  claim 15  wherein
 said disc spring is between said forward end of said retainer sleeve and said annular flange, 
 said retainer sleeve has a compressed diameter for retaining said shank in a bore of a tool holder, and 
 said disc spring has a central opening with a diameter less than said compressed diameter wherein said disc spring urges said retainer sleeve against said annular shoulder.