Plunger tip for cold chamber die cast machine

A plunger tip for attachment to a threaded end of a plunger shaft in a shot cylinder of a die casting machine, said plunger tip comprising:

• a closed wear ring, the outside diameter of which is sized nominally to said bore of said shot cylinder;
• a cap, having an outside diameter which just fits inside said wear ring, having a tip end and an attachment end, having an annular shoulder portion located near said tip end, larger than the diameter of the rest of said cap and butting against said wear ring, and threaded attachment means at said attachment end for threadedly attaching said cap to said threaded end of said plunger shaft;
• a collar, slid onto said cap so as to capture said wear ring between itself and said shoulder, and having means which cooperate with corresponding means on said cap to prevent relative rotation between said cap and itself;
• and
• means for holding said collar with respect to said plunger shaft, so as to permit said cap to be threaded tightly onto said threaded end of said plunger shaft without requiring application of a wrench directly to said cap.

A plunger tip for attachment to a plunger shaft in a shot cylinder of a die casting machine, said plunger shaft having a threaded end, said plunger tip comprising:

• a cap, having a tip end and an attachment end, having an annular shoulder portion located near said tip end, larger than the diameter of the rest of said cap, and threaded attachment means at said attachment end for attaching said cap to said threaded end of said plunger shaft;
• and
• tubular bearing means, having an inside diameter which just fits over said cap, and having an area of largest outside diameter which is sized nominally to said bore of said shot cylinder, the forward end of which area of largest diameter butts against said shoulder of said cap, said bearing means being slid onto said cap, and having means which cooperate with corresponding means on said cap to prevent relative rotation between said cap and itself;
• said bearing means including means for holding said bearing means with respect to said plunger shaft so as to permit said cap to be threaded tightly onto said threaded end of said plunger shaft without requiring application of a wrench directly to said cap.