Patent ID: 7080432
Filing Date: 2006-07-25
Classification: B25B,Y10T

Abstract:
1. A tool for installation of a multi-turned spiral lock ring via one end of the tool and a wire lock ring via an opposite end of the tool, into a bore groove of a wrist pin cross bore of a piston assembly, the tool comprising: a. a center, knurled, round handle adapted to be manually grasped and rotated by a user; b. a first cylindrical tool section at the one end of the tool adjacent the handle, the first cylindrical tool section being of a diameter corresponding to the bore to facilitate installation therein, the first cylindrical tool section having a first head with a helical rectangular-cut groove having only a half turn on a front face of the first cylindrical tool section immediately adjacent a protruding smaller diameter of the first cylindrical tool section, the helical groove having a depth, width, pitch and length relative to the multi-turned spiral lock ring so as to receive within the helical groove the spiral lock ring in a condition expanded axially from a relaxed condition thereof to reduce the diameter of the spiral lock ring sufficiently to enable the spiral lock ring to be transferred within the bore and into the bore groove; c. a second cylindrical tool section at the opposite end of the tool adjacent the handle, the second cylindrical tool section having a second head with an outside diameter portion fitting the bore and having a protruding concentric smaller shank sized to allow the second cylindrical tool section to compress diametrically the wire lock ring to slide within the bore until the compression of the wire lock ring releases at the bore groove to receive the wire lock ring in the bore groove.