| 摘要 |
In float actuated pump having a rod and lever actuation from the float, an improved connect between the rod and lever is disclosed enabling valve opening substantially free of constraint by the rod and attached fittings. Such arrangement also enabling exhaust valve opening in a two-step momentum inducing method. Specifically, a valve actuating lever biased by a counter weight at one lever end, connects to the operating rod at the improved joint at the other lever end. The end of the rod is provided with an arcuate slot made of magnetic attractive material. The lever connects at a lever pin to the arcuate slot. The curvature of the slot prevents towards and away movement of the rod; the length of the slot gives free up and down rod movement at the lever pin within the elongate slot. At the top of the travel of the arcuate slot, a magnet is included in the pump head. This magnet has sufficient strength to support the rod and all attachments; the magnet has insufficient strength to support the float when added to the rod and all attachments. When rod actuation to open the air inlet valve occurs, the lever moves free of rod constraint by movement with the elongate slot and the attraction of the magnet. When rod actuation to open the exhaust air valve occurs, the lever moves with added impetus of the momentum gained by pulling the control rod from the magnet and having the top of the arcuate slot strike the lever on its way downward. As a result, operating pressure and pump volume is improved. Provision is made for release of the magnet to enable momentum of the fall rod to assist in valve opening.
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