Importance

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Abstract

A load brake having a load shaft, a flange-like pressure plate fixedly mounted onto the load shaft, and a cogwheel arranged on the load shaft. A tension device produces an axial motion and force in the cogwheel as the wheel rotates with respect to the load shaft, and a ratchet wheel is mounted between the pressure plate and the cogwheel. A pawl prevents the rotation of the ratchet wheel at least in the release direction of the load shaft, and friction surfaces are provided between the pressure plate and the ratchet wheel, and the ratchet wheel and the cogwheel. Rotation that tends towards the release direction of the load shaft and that is faster than the speed of rotation of the cogwheel brings the pressure plate and the cogwheel closer together in the axial direction and presses them against the ratchet wheel. Rotation that occurs in the release direction of the load shaft that is directed at the cogwheel, and that exceeds the braking torque and that is faster than the speed of rotation of the load shaft removes the pressure plate and the cogwheel further apart in the axial direction and thus unlocks the braking connection of the pressure plate, the ratchet wheel and the cogwheel. A preclamping device is provided in connection with one friction pair of the friction pairs formed by the pressure plate and the ratchet wheel, and the ratchet wheel and the cogwheel, which produces an axial preclamping force that presses the elements of the friction pair together.

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First Claim