Patent ID: 8677870

Claim:
An emergency braking system for braking a revolving shaft of a machine tool for protecting a user of the machine tool, comprising: a brake drum; a brake shoe carrier connected to the shaft; and at least one brake shoe pivotably connected to the brake shoe carrier; and a locking pin extending through an opening in the brake shoe carrier and switchable between a locked position, in which the locking pin extends through the opening in the brake shoe carrier and engages with an opening in the at least one brake shoe to fixedly hold the brake shoe against the brake shoe carrier as the shaft is rotated, and an unlocked position, in which the locking pin is disengaged from the opening in the at least one brake shoe to release the brake shoe from the brake shoe carrier and engage the brake shoe with the brake drum in order to stop the shaft within 50 ms under the influence of a centrifugal force resulting from the rotation of the shaft.