Patent ID: 6507985
Filing Date: 2003-01-21
Classification: B23P,B25B,Y10T

Abstract:
Tooling for installing a circular resilient snap ring into an annular groove in an annular wrist pin bore in a piston for retaining a tubular wrist pin therein comprising:a snap ring installation sleeve having an internal through passage extending from a spring entrance end to a spring discharge end, said sleeve having a base portion adapted to be seated on the piston and in alignment with the annular wrist pin receiving bore, said through passage being tapered to progressively constrict said snap ring as it is being displaced from said entrance to said discharge end, an elongated snap ring installation plunger having an inboard end and an outboard end, at the inboard end an inboard stem for sliding axial reception in the tubular wrist pin, said plunger having a cylindrical ring displacement body between the inboard and outboard ends and a manual handle at the outboard end, a cylindrical ring displacement sleeve mounted for axial sliding movement on said ring displacement body, said ring displacement sleeve having a free end for initially engaging said snap ring and displacing said ring in said tapered bore to a predetermined position therein to thereby constrict said ring to a predetermined stresslevel to prevent overstress, said ring contact body having a ring contact surface at the inner end there of which matches and contacts said constricted ring, said plunger being axially movable relative to said ring displacement sleeve so that said ring displacement body can further move said ring into said bore and into alignment with said annular groove allowing said ring to expand therein and be retained thereby.