| 摘要 |
A plunger assembly including a pony rod adapter, a plunger releasably attached to the pony rod adapter, and a pony rod being releasably attached to the pony rod adapter. The pony rod adapter has a first cylindrical body and a number of apertures penetrating the first cylindrical body for receiving a lever. A first helically threaded pin is affixed to the first cylindrical body and projects from one of its ends. A second helically threaded pin is affixed to the first cylindrical body and projects from the other of its ends. The plunger has a second cylindrical body for reciprocating within a pumping chamber. The second cylindrical body has a first outer end with a first helically threaded bore for threadably receiving the first helically threaded pin. The second cylindrical body also has a first inner end with a polygonal socket for receiving a plunger key. The pony rod has a third cylindrical body for reciprocating into, and out of, the power end of a pump. The third cylindrical body has a second inner end with a second helically threaded bore for threadably receiving the second helically threaded pin. The third cylindrical body also has a second outer end. A peripheral flange is affixed to, and extends outwardly from, the second outer end. The peripheral flange is provided with a number of holes through which an equal number of threaded fasteners are extended for connecting the pony rod to the power end of a pump.
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