Patent ID: 7845467

Claim:
A belaying device for a rope, comprising: a support plate equipped with a fixed stud, a gap situated between the stud and a cam, the cam being mounted with limited rotation on the support plate about a first spindle-pin and having a peripheral sector around which the rope is wound, said cam having a securing position and a separated position wherein the cam is movable between the securing position, in which the rope is securely held against the stud, and the separated position, which enables the rope to run freely in the gap between the cam and the stud, and a triggering ratchet having a locked position and an unlocked position, the triggering ratchet movable between the locked position, in which the triggering ratchet is positioned to lock the cam in the separated position, and the unlocked position; the triggering ratchet being moved to the unlocked position after a response to a control action releasing said cam from the separated position, wherein the triggering ratchet is mounted with limited capability of pivoting on a third spindle-pin and comprises a detent member, the cam comprises a locking notch, and the detent member engages with the locking notch, the triggering ratchet is equipped with a control vane operating in conjunction with a spring, the spring biasing the triggering ratchet to the locked position, and an action of a first strand of the rope pressing on the control vane is capable of moving the triggering ratchet to the unlocked position, and the locking notch being formed in an oblong opening arranged in the cam, said opening including a shape of an arc being a radial distance from the first spindle-pin and having a length that is at least equal to a distance moved after an angular movement of the cam moving between the separated position and securing position.