Abstract: Maintained contact push-button, particularly an emergency stop button, provided with a padlocking accessory. The button has a barrel and a movable head. The accessory has a sleeve fixed with respect to the barrel and having an inner shape matching the upper part of the barrel, and a movable ring. The ring has at least one aperture for the passage of padlocks on its upper edge, and is mounted on the outside of the sleeve so that it can move between a lower inactive position and an upper active position, by a movement which is limited by means of stop elements, in such a way that the head is left free in the lower position and the upper edge of the ring rises above the head in the upper position.

Abstract: The button has a barrel and a movable head. The accessory has a sleeve fixed with respect to the barrel and having an inner shape matching the upper part of the barrel, and a movable ring. The ring has at least one aperture for the passage of padlocks on its upper edge, and is mounted on the outside of the sleeve so that it can move between a lower inactive position and an upper active position, by a movement which is limited by means of stop elements, in such a way that the head is left free in the lower position and the upper edge of the ring rises above the head in the upper position.

Abstract: A key attached, for example, to the door of an electrical equipment cubicle is capable of sliding within a passageway so as to cause pivotal displacement of a cam and upward displacement of a push-rod, thus releasing a switch lug. A locking rod forming part of a slide-block which is coupled with the push-rod is capable of moving between a locking position in which an annular channel permits displacement of the key and an unlocking position in which the locking rod is engaged within a key notch. One end of the slide-block projects from the top face of the switching unit head in order to be downwardly displaced by an actuator, whereupon the key can be withdrawn without difficulty or danger.