Patent ID: 6241228
Filing Date: 2001-06-05
Classification: B23Q,Y10T

Abstract:
A workholder for securing a work piece by engaging a plurality of bores contained in said work piece, said workholder comprising:a support platform including:a plurality of cavities extending downwardly into said support platform;a plurality of spring elements, each of said spring elements positioned in a respective cavity;a plurality of bore clamping devices mounted to said support platform, each of said bore clamping devices having a cylindrical expandable arbor extending upward from said support platform for engaging one of said bores, each said cylindrical expandable arbor extending through a respective cavity, said cylindrical expandable arbor including:a slit vertically extending through said cylindrical expandable arbor from a first end proximate said support platform to a second end distally located from said support platform, said slit having a narrow region proximate said second end, each said cylindrical expandable arbor extending through a respective cavity;a wedge positioned within said slit, said wedge having a pair of wings extending from opposing sides of said wedge and said slit, said wings extending outwardly from said cylindrical expandable arbor and over a respective spring element; anda hydraulic cylinder in operational engagement with said first end of said cylindrical expandable arbor, whereby said hydraulic cylinder is selectively actuated to draw said cylindrical expandable arbor toward said support platform to thereby drive said wedge towards said second end of said slit to expand said cylindrical expandable arbor.