Screw-on annular rings for die cast beryllium copper plunger tips

Abstract

A metal plunger tip has a forward generally cylindrical section having a leading relatively flat forward end and enlarging at its rearward end to a first land. A middle generally circular threaded section spans between the first land and a second generally larger land at its rearward section. A rearward generally cylindrical section of larger diameter spans between the second land a its rear surface that terminates with a section for attachment to an externally threaded push rod. There is an interior cooling cavity in the plunger tip terminating with a rear internally threaded section for mating with an externally threaded push rod. The metal plunger tip can be made from beryllium copper. The metal plunger tip may have a leading chamfered edge. A metal wear ring can be screwed onto the metal plunger tip.

I claim: 
     
         1 . A metal plunger tip, which comprises:
 a forward generally cylindrical section having a leading relatively flat forward end and enlarging at its rearward end to a first land,   a middle generally circular threaded section spanning between said first land and a second generally larger land at its rearward section,   a rearward generally cylindrical section of larger diameter spanning between said second land a its rear surface that terminates with a section for attachment to an externally threaded push rod,   there being am interior cooling cavity in said plunger tip terminating with a rear internally threaded section for mating with an externally threaded push rod.   
     
     
         2 . The metal plunger tip of  claim 1 , made from beryllium copper. 
     
     
         3 . The metal plunger tip of  claim 1  having a leading chamfered edge. 
     
     
         4 . The metal plunger tip of  claim 3 , wherein said chamfered edge is at about a 45° angle. 
     
     
         5 . A metal plunger tip and wear ring assembly, which comprises:
 a metal plunger tip comprising:
 (a) a forward generally cylindrical section having a leading relatively flat forward end and enlarging at its rearward end to a first plunger tip land, 
 a middle generally circular threaded section spanning between said first plunger tip land and a second generally larger plunger tip land at its rearward section, 
 a rearward generally cylindrical section of larger diameter spanning between said second land a its rear surface that terminates with a section for attachment to an externally threaded push rod, 
 there being am interior cooling cavity in said plunger tip terminating with a rear internally threaded section for mating with an externally threaded push rod; and 
 a metal wear ring comprising: 
 (b) a generally circular annulus having a forward generally smooth interior and an internally threaded rearward section with a first wear ring land therebetween, said internally threaded rearward section terminating with a second wear ring land; 
   said metal wear ring screwing onto said metal plunger tip with said first plunger tip and wear ring lands mating, and said second plunger tip and wear ring lands mating.   
     
     
         6 . The metal plunger tip of  claim 5 , made from beryllium copper. 
     
     
         7 . The metal plunger tip of  claim 5  having a leading chamfered edge. 
     
     
         8 . The metal plunger tip of  claim 7 , wherein said chamfered edge is at about a 45° angle.