Abstract: A device for unhooking a main anchor chain (4) from the shank (7) of an anchor (2) makes it possible to release anchor. An elongated plate (10) has one end adpated to receive the last link of the anchor chain (4). The other end of plate (10) has an opening (15) for receiving a shackle (15) on the anchor. A second plate (16) has a finger (17) that covers opening (15) thus making possible the hooking and unhooking of the shackle (6). A tube (29) dropped from the boat runs freely over the main anchor chain (4) to pivot the plates and uncover opening 15. This releases the shackle and therefore the anchor, so that it may be unsnagged.

Abstract: The marine anchor has two symmetrical flukes, each one of them fitted with a pair of symmetrical ledges. Between the flukes, a shank is capable of pivoting around a transverse shaft that joins the two flukes, so as to form, relative to the shaft, a fore arm and a rear arm. The free end of the rear arm carries transverse stop-pins. An oblong aperture is provided in the shank, for the passage of a shaft that joins the flukes. The stop-pins come into abutment against the ledges of the flukes when the shaft is in the rear part of the aperture. The stop-pins are released from the ledges when the shaft is in the fore part of the aperture. The aperture has the general shape of a truncated triangle, the axis of symmetry of which is one and the same with the longitudinal axis of the shank, the long base of the truncated triangle being in the fore. Under normal conditions, elastic or breakable lug pieces limit the movements of the stop-pins when they are released from the ledges.