Self-locking obturating device

An obturating device comprising a plug intended to be placed on a threaded orifice or to be removed therefrom, by screwing and unscrewing respectively, comprising a body carrying a thread and reversible ratchet engagement means opposing spontaneous unscrewing of the plug, said reversible ratchet engagement means being activated automatically by rotation of the plug and its corresponding progression in an axial direction of the thread, wherein said reversible ratchet engagement means comprise two locking members, which are integral in rotation with the plug and with the orifice respectively, and wherein these two locking members are positioned such that they axially mesh with one another when the plug closes the orifice, under a thrust produced by a return means urging a first of these locking members towards the other, and wherein the reversible ratchet engagement means are designed such that, starting from a screwed-in state of the plug, unlocking of the plug requires a greater torque to be applied to the plug in a direction of unscrewing than in a direction of additional screwing.

An obturating device comprising a plug intended to be placed on a threaded orifice or to be removed therefrom, by screwing and unscrewing respectively, comprising a body carrying a thread and reversible ratchet engagement means opposing spontaneous unscrewing of the plug, which are activated automatically by rotation of the plug and its corresponding progression in an axial direction of the thread, wherein said reversible ratchet engagement means comprise two locking members, which are integral in rotation with the plug and with the orifice respectively, and wherein these two locking members are positioned such that they axially mesh with one another when the plug closes the orifice, under a thrust produced by a return means urging a first of these locking members towards the other, and wherein when the plug is in the locked and screwed-in state, the reversible ratchet engagement means define, by their axial meshing, a first mutual bearing opposing spontaneous unscrewing by mutual engagement of two contact faces inclined at a first angle which is relatively large, but less than 90.degree., with respect to a radial plane, and a second mutual bearing, tending to oppose additional screwing, by mutual engagement of two ramps inclined at a second angle with respect to the radial plane, said second angle being smaller than the first angle.

An obturating device comprising a plug intended to be placed on a threaded orifice or to be removed therefrom, by screwing and unscrewing respectively, comprising a body carrying a thread and reversible ratchet engagement means opposing spontaneous unscrewing of the plug, which are activated automatically by rotation of the plug and its corresponding progression in an axial direction of the thread, wherein said reversible ratchet engagement means comprise two locking members, which are integral in rotation with the plug and with the orifice respectively, and wherein these two locking members are positioned such that they axially mesh with one another when the plug closes the orifice, under a thrust produced by a return means urging a first of these locking members towards the other, wherein the return means is borne by the plug and applies an axial force towards the inside of the orifice on the locking member which is integral in rotation with the plug, wherein the plug comprises a skirt externally surrounding the locking member integral with the plug and the return means, and wherein the skirt has radially inwardly directed rim limiting axial translation, under the thrust of the return means, of the locking member integral in rotation with the plug.