Abstract: Cutting device with a number of cutting tools which individually and replaceably are mounted upon a supporting edge, each tool being V-shaped with a short leg and a long leg. The space between said legs fits upon the tapered shape of said edge, each long leg extending into a bracket which is integral with the part having said edge and is located at a distance from said edge. Between said part and said long leg a deformable element is placed in a space formed between the bracket and the edge.

Abstract: A quick-coupling ball-and-socket joint for two rigid pipe lengths 1, 2, for instance of a dredging sludge pipe line, provided with a ball joint 3 affixed to the one pipe length 1, and with a ball socket 4, 5, 14 affixed in the coupled position integrally to the other pipe length 2, in which socket the ball joint 3 in the coupled position is omnilaterally pivotable, and which ball socket 4, 5, 14 comprises at least a two-part coupling body 4, 5 which is integrally omnilaterally pivotable with respect to the ball joint 3, and retained about said ball joint 3, and a separate sleeve 14 affixed to the other pipe length 2, said coupling body 4, 5 and sleeve 14 being adapted during the insertion for coupling the pipe lengths 1, 2 in the sleeve 14 of the ball joint 3 with coupling body 4, 5 retained therearound, for snapping together said sleeve 14 and said coupling body 4, 5 with mutual centering.