Patent ID: 6938527

Claim:
An apparatus for advancing material stock into and through an external holding device seated in a headstock spindle assembly, said apparatus comprising in combination: an elongate body having first and second ends and a cylindrical bore extending lengthwise thereabout defining an interior chamber; a plunger assembly housed within said interior chamber and operably working longitudinally therewithin, said plunger assembly comprising means for biasing a ram having a cylindrical stop situated in between a spring retainer and a shaft having an inwardly conical depression at its end to engage an end of material stock, said cylindrical stop comprising an annular spring seat having an inner wall in common with the outside diameter of said spring retainer; an end plug fixedly attached to said first end to retain axial positioning of said plunger assembly within said interior chamber while operably moving toward and away from said first and second ends; and means for attaching said second end of elongate body to the external holding device.