| 摘要 |
A control means for use with a counterbalanced pump unit including in general a frame, a pump rod leading to a bottom hole pump, counterweights movably mounted from the frame for offsetting the weight of the pump rod, means for driving the counterweights between upper and lower positions, and means for causing the pump rod to move relative to the counterweights. The control means includes cammed means mounted to the frame, cam means mounted to the counterweights and coacting with the cammed means as the counterweights are driven between the upper and lower positions, and linkage means connecting the cammed means to the means for driving the counterweights to regulate the means for driving the counterweights as the cam means coacts with the cammed means causing the counterweights to move between the upper and lower positions in a smooth, even rate.
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