Device and method for forming square inside corners on raised panels formed of single workpieces

A device mountable on a tool head of a machine having a rotatable spindle, operable for forming a square corner in a curved corner in a workpiece comprising:

• support means mountable on said tool head;
• a tool bit mounted on said support means for reciprocal motion along a line of travel, said tool bit having a pair of adjoining side wall surfaces each displaced 45.degree. relative to said line of travel, and a bottom wall, provided with material removal means disposed on either lower edges of said side wall surfaces or said bottom wall;
• and
• means disposed in said support means for transmitting drive from said spindle to said tool bit including means for translating the rotary motion of said spindle to reciprocating motion of said tool bit along said line of travel;
• whereby upon reciprocating said tool bit while guiding it along a predetermined path into the portion of said workpiece comprising said curved corner, said material removal means will function to remove material to provide a square corner of a desired profile.

A method of forming a juncture of a pair of adjoining surfaces spaced a predetermined angle apart in a curved portion of a workpiece, comprising:

• positioning a tool bit having a pair of adjoining side wall surfaces displaced said predetermined angle apart with material removal means disposed on either the lower edges of said side wall surfaces or a bottom wall thereof adjacent the portion of said workpiece material forming said curved portion to be removed;
• reciprocating said tool bit along a line of travel bisecting the planes of said side wall surfaces;
• and
• guiding the apex of said adjoining side wall surfaces of said tool bit along a predetermined path into said workpiece material to be removed to form a juncture having a profile corresponding to the path along which said tool bit is guided.

A method of forming a juncture in a workpiece having at least two adjoining rectilinear sections angularly displaced relative to each other, comprising:

• routing said sections to form a curved juncture between said adjoining sections;
• positioning a tool bit having a pair of adjoining side wall surfaces spaced apart at an angle corresponding to the angular displacement of said sections relative to each other with material removal means disposed on either the lower edges of said side wall surfaces or a bottom wall thereof, adjacent said curved juncture of said workpiece;
• reciprocating said tool bit along a line of travel bisecting the planes of said side wall surfaces;
• and
• guiding the apex of said adjoining side wall surfaces of said tool bit along a predetermined path into said workpiece behind said curved juncture to form a juncture having a profile corresponding to the path along which said tool bit is guided.