| 摘要 |
A pump having a piston of variable stroke driven by a pair of cooperating eccentrics both of which are adjustably carried by a single driven shaft. The shaft is provided with helical grooves within which ride followers for positioning of the eccentrics upon axial shaft movement. The outer eccentric functions as a cam to drive a follower and pump piston. The eccentricity of the outer eccentric may be varied by moving the outer eccentrics center progressively towards the axis of the shaft to adjust the stroke of the pump piston.
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