Patent ID: 8157061

Claim:
An elevator installation with an elevator car that moves in a vertical direction along a pair of guide tracks and a braking equipment for braking the elevator car, the braking equipment comprising: at least two brake units each attached to the elevator car and each said brake unit associated With one of the guide tracks, each said brake unit generating a first force by pressing a brake plate toward the associated guide track, said first force being a braking force or a holding force for braking or holding the elevator car; a brake control unit for generating a target force signal for controlling said first force; a force measuring means associated with each of said brake units to sense an actual value of said first force; and a force regulating means associated with each said brake unit, said force regulating means regulating said first force applied by said associated brake unit in response to said target force signal received from said brake control unit and the actual value of said first force sensed by said force measuring means, wherein each said brake unit includes an adjusting regulating means for setting an air gap predetermined by said brake control unit, said air gap being a spacing between brake plates of said brake unit and a braking surface of the guide track, wherein each said brake unit includes a locking device for locking said brake unit in a set braking position to maintain an actually adjusted first force in case of a reduction or an interruption of the supply of energy to said brake unit.