| 摘要 |
The plunger tip includes a closed, one-piece wear ring, the outside diameter of which is sized nominally to the bore of the shot cylinder. A cap is provided, a portion of which having an outside diameter which just fits inside the wear ring. The cap is elongated and has a tip end and an attachment end. An annular shoulder portion is located near the tip end, which shoulder portion is larger than the diameter of the rest of the cap and butts against the wear ring. A collar is slid onto the cap so as to capture the wear ring between itself and the shoulder of the cap. The cap includes flats at the attachment end, and the collar includes flats on an inside surface thereof which match with the flats of the cap for preventing relative rotation between the cap and the collar. The cap is provided with threads formed on its attachment end, the plunger shaft having matching threads by which the plunger shaft is connected to the cap. The collar has two or more flats on its outside surface for cooperating with a wrench to allow the collar, and hence the cap, to be rotated with respect to the plunger shaft in attaching the shaft and the cap together. The collar includes openingss for allowing the escape of any leaked cooling fluid through side walls thereof.
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