It's really no different than most other types of pumps. Basically the tolerance between the inner shaft and the tube it rotates in acts as a check valve, much like the tolerance between the gears and the sides of the housing do in a gear pump. From there, when the flat on the shaft passes the inlet port, head pressure from the oil tank forces oil into the cavity formed by the flat. As the shaft rotates the oil is carried around to the outlet port. In a pump like this the oil being moved isn't really being pressurized so much as is simply being conveyed from the tank to the outside. In any case, given the way liquids flow, when it reaches the outlet port, it is going to have a tendency to flow from it's container to the point of lowest resistance, which will be out the oiler tube and to the bar.
It's really a very simple setup when you get right down to it, but it works, and that's all that matters.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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