Patent ID: 6209690
Filing Date: 2001-04-03
Classification: B66D,F16F

Abstract:
A load brake comprising:a load shaft, the load shaft being rotatable in a release direction;a pressure plate that is fixed to the load shaft;a cogwheel disposed on the load shaft and operatively connected to a tension device, the tension device producing an axial motion of the cogwheel as the cogwheel rotates with respect to the load shaft;a ratchet wheel mounted between the pressure plate and the cogwheel;a pawl for preventing rotation of the ratchet wheel at least in the release direction of the load shaft;friction surfaces provided between the pressure plate and the ratchet wheel and forming a first friction pair;friction surfaces provided between the ratchet wheel and the cogwheel and forming a second friction pair; anda biasing device, the biasing device being associated with one of said friction pairs, the biasing device producing an axial force which acts to press the elements of one of said friction pairs together, whereinthe tension device includes an element fixedly mounted to the load shaft, and a movable element which cooperates with the fixedly mounted element, the movable element being rotatable with respect to the load shaft, and being movable over a limited axial distance during rotation,the ratchet wheel is mounted with a bearing on the movable element of the tension device, anda spring means is attached to the movable element to press the ratchet wheel against the cogwheel through the bearing of the ratchet wheel.