Patent ID: 9205520
Filing Date: 2015-12-08
Classification: B23P,F16B,Y10T

Abstract:
1. A two-stage punch in a fastener press for installing a nut into a sheet of host material, comprising: a cylindrical sleeve having an internal axial bore, said sleeve having an axially extending embossing ring projecting from a first end; a spring located within said sleeve and operative at a first end thereof against an internal inward facing flange of said sleeve; a center punch having a shank portion which is received within said spring and said sleeve which includes a radially extending collar closely slidable within said sleeve bore, said collar including a surface which bears against a second end of said spring, said center punch further described as having a working pointed end and an opposing driving end adapted for affixation to a ram of a press; means for captivating said center punch in said sleeve such that said sleeve is resiliently biased away from said driving end of said center punch and said sleeve is moveable between extended and retracted positions relative to said punch; and wherein said embossing ring extends axially beyond the pointed end of said center punch when said sleeve is in the extended position, said sleeve and center punch being operative such that said pointed end extends axially beyond said embossing ring when said sleeve is in the retracted position due to the compression of said spring by the application of force applied to said driving end of said center punch which is counteracted by the impingement of the embossing ring against the host material.