| 摘要 |
Mechanism for adjusting the stroke length of a variable positive displacement pump at any time without stopping the operation of the pump. A drive shaft mounted on a frame drives a crank, and a bearing on the end of the crank rides in an elongated slot in a driving arm attached to a connecting rod which imparts reciprocating movement to the pump. The outer end of the driving arm is pivoted to a control arm which is rotatably adjustably mounted on the frame to change the orientation of the elongated slot with consequent change in the stroke of the connecting rod.
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