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Alphonse Couvreux (1820-1890) was a French civil engineer.
Patented a steam-driven bucket-chain excavator. Several examples were ordered in 1863 for the construction of the Suez Canal. A 1/5 scale model, made by Digeon c.1878, is on display at the Musée des Arts et Métiers.
1868 Couvreux's newly-invented bucket for dredgers and excavators was illustrated in the Practical Mechanic's Journal, 1 March 1868. The quadrant-shaped buckets included a moving back plate which discharged adherent substances such as clay. The moving parts of the bucket chains had improved arrangements for lubricating the pins, and for excluding dust using rubber seals.