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Carlsund's thread |
| The crankshaft is provided with longitudinal slots. A casing, yellow on the picture, connected to the eccentric is provided with thread-like slots. An outer axially movable casing with a number of concentric rings is provided with blocks, blue on the picture, that slide in the slots of the eccentric-casing as well as the slots of the crankshaft. A pinion moves the outer casing axially, as a rack gear, and that movement turns the eccentric on the crankshaft and the engines rotation reverses. |  |
| Stemboat with Carlsund thread | |
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