Model: Z03 Power Machine Coupling of Uhlhorn
In his machine design book titled The Constructor (or The Designer) Reuleaux cites the importance of having an overrunning coupling or clutch from two different power sources. He describes two clutches for this purpose Models Z-3, Z-4. which are shown in figures 453 and 454 in his book. In the Uhlhorn coupling, to levered pawls attached to an inner disc on the driven shaft, can engage three ratchet like slots in the outer disc attached to another collinear motor shaft. If the inner shaft with the pawls runs faster than the outer disc, the coupling slips and the shafts are disengaged. Reuleaux wrote that this clutch was used in Germany in the 19th century.

Francis Moon 2003-07-01

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