| 摘要 |
On a quick-action coupler on a three-point mounting device on agricultural machines, consisting of a hook on the lower link and of a coupling member in the form of a bush equipped with a frustoconical catchplate, the object to be achieved is to design the quick-action coupler so that no appreciable wear occurs either on the journal of the mounted appliance nor on the hook of the lower link and that the wear on the coupling member is also kept as low as possible. The invention achieves this object in that the outer face of the bush of the coupling member is cylindrical, in that the inner face of the bush of the coupling member has a hollow-spherical shape, in that this hollow-spherical space receives a spherically thickened tubular connection piece, and in that the bush carries a bead and/or a further catchplate on the side facing away from the catchplate. When this coupling member is used, wear on the journal of the mounting appliance and on the hook is largely prevented. But scarcely any wear can also be detected on the coupling member. This is because the hollow-cylindrical inner space of the tubular connection piece fits exactly onto the journal of the mounted appliance, and because the cylindrical outer face of the bush is located exactly in the hook of the lower link.
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