Clamping mechanism for cutting insert

Abstract

A toolholder for holding a cutting insert having an axial hole is disclosed having a pocket therein for seating of the insert and a hole in the toolholder extending transversely through the bottom of the pocket. A pin having a head for engaging the insert and a pivotal shoe member cooperate in the hole such that, as the rotatable pin is tightened, the shoe member forces the head of the pin to tilt toward a side wall of the pocket and clamp the insert to the toolholder.

What is claimed is: 
     
       1. A cutting tool for holding a cutting insert having an axial hole therein, which comprises: a cutter body; an insert seat on said cutter body having at least a bottom wall and a side wall, the insert seat having a transverse pin receiving hole located for at least partial registration with the axial hole in the insert; abutment means in said pin receiving hole beneath said insert seat; a pin having a head for engaging the axial hole of the insert and another end for moving engagement with said cutter body in said pin receiving hole; .[.an.]. .Iadd.a resilient .Iaddend.abutment shoe .Iadd.captively engaged to said pin and .Iaddend.pivotally mounted in relation to and between said abutment means and said pin so that when said pin is moved in a first direction in the hole said shoe pivots forcing the head of the pin to tilt toward said side wall and clamp the insert in said insert seat, said pivotal shoe allowing said pin to straighten when said pin is moved in a second direction in said hole. 
     
     
       2. A cutting tool according to claim 1 in which said hole has an enlarged section beneath said insert seat and said abutment means is formed at the juncture of said enlarged section and said hole. 
     
     
       3. A cutting tool according to claim 2 in which said abutment shoulder faces upwardly toward said insert seat. 
     
     
       4. A cutting tool according to claim 1 in which said pin has a reduced diameter portion between said ends, said other end of said pin is threadedly engaged with said cutter body and said shoe member is recessed so as to fit around the axial dimension of said pin, said pin being rotatable with respect to said shoe member in said cutter body. 
     
     
       5. A cutting tool according to claim 4 which further includes said pin having a flanged portion intermediate said ends for engaging a shim member that is placed beneath said insert in said insert seat. 
     
     
       6. A cutting tool according to claim 4 in which rotation of said threaded pin advances said pin in said first direction and counter-rotation of said pin causes movement in said second direction. 
     
     
       7. A cutting tool according to claim 6 in which said first direction is downwardly into said cutter body and said second direction is opposite to said first. 
     
     
       8. A shoe member for use in an insert clamping arrangement which comprises a body of tough resilient material having a top surface having a slanted portion, a bottom surface, a peripheral surface connecting said top surface to said bottom surface, a bore communicating between said top surface and said bottom surface and intersecting said peripheral surface continuously from top to bottom so as to provide said body with a C-shaped configuration when viewed in plan, said bore aligned obliquely with planes defined by said top slanted portion and said bottom surface, a convex surface forming the juncture of said peripheral surface and said bottom surface, and wherein said convex surface is generally located on said shoe body opposite to where said bore intersects said peripheral surface. 
     
     
       9. A pin and shoe arrangement for holding a cutting insert having an axial hole therein on a cutter body with an insert seat thereon, said pin and shoe arrangement comprising: said shoe having a body of tough resilient material having a top surface having a slanted portion, a bottom surface, a peripheral surface connecting said top surface to said bottom surface, a bore communicating between said top surface and said bottom surface and intersecting said peripheral surface continuously from top to bottom so as to provide said body with a C-shaped configuration when viewed in plan, said bore aligned obliquely to planes defined by said top slanted portion and said bottom surface, a convex surface forming the juncture of said peripheral surface and said bottom surface, and wherein said convex surface is generally located on said shoe body opposite to where said bore intersects said peripheral surface; said pin having a threaded end, a reduced diameter intermediate section connecting said threaded end to an increased diameter head end, and wherein said reduced diameter intermediate section is of a length and a diameter sized to be loosely engageable in said bore of said shoe; and said reduced diameter intermediate section of said pin loosely engaged in the bore of said shoe such that said bottom surface of said shoe faces said threaded end of said pin.