Tool-carrier chuck for rotating machine, furnished with locking means

A tool-carrier chuck for fitting to a rotating machine, comprising:

• a central part comprising a rear portion intended to be fastened to a driveshaft of the rotating machine, peripheral gear teeth and a front portion with which jaws are associated, said jaws being able to be moved relative to the central part between a clamped position and an unclamped position;
• a rotating part mounted so that it can rotate about the central part;
• a clamping ring mounted so that it can rotate about the rotating part by a limited angular amount and allowing the jaws to move between the clamped position and the unclamped position;
• wherein the rotating part has an opening defined by walls situated opposite the peripheral gear teeth of the central part, and in which a locking finger is engaged, the locking finger comprising an immobilizing portion protruding from the opening inside the rotating part towards the central part and an actuation portion extending substantially perpendicular to the immobilizing portion and placed between the rotating part and the clamping ring, and wherein the clamping ring comprises actuation means capable of interacting with the actuation portion of the locking finger to cause said locking finger to pivot in a plane transverse to the chuck and being guided by the walls of the opening, between:
• a locked position, in which the immobilizing portion of the locking finger interacts with the peripheral gear teeth of the central part, in order to allow the central part to rotate relative to the clamping ring in a first direction, corresponding to the clamping of the jaws, and to prevent this rotary movement in a second direction, corresponding to the unclamping of the jaws;
• and an unlocked position, in which the locking finger does not interact with the central part, the rotary movements of the central part relative to the clamping ring being possible in both directions,
• wherein the actuation portion of the locking finger comprises a locking housing and an unlocking housing radially separated from one another and each having an opening turned towards the clamping ring, and in that the clamping ring comprises a locking lug and an unlocking lug protruding inwards and radially separated from one another by a distance greater than the radial separation between the locking housing and unlocking housing of the finger, the clamping ring being capable of being rotated relative to the rotating part between the locked position, in which the locking lug interacts with the locking housing, and the unlocked position, in which the unlocking lug interacts with the unlocking housing.