Brake device for an elevator car, comprising an integrated load measuring device, use thereof in an elevator system, and method

A braking apparatus for braking a displaceable elevator car of an elevator installation and for measuring load changes caused in the elevator car, the braking apparatus comprising:

• a brake adapted to brake the elevator car relative to a stationary component of the elevator installation;
• a brake holding arrangement adapted to hold the brake on the elevator car;
• a load measuring device having a force transmission element measuring a force acting on the force transmission element;
• a load measuring device holding arrangement adapted to hold the load measuring device on the elevator car;
• wherein the brake and the brake holding arrangement are held on the elevator car by the brake holding arrangement such that the brake can be displaced relative to the elevator car up to a predetermined position in a force direction generated by actuation of the brake;
• wherein the load measuring device and the load measuring device holding arrangement are held on the elevator car by the load measuring device holding arrangement such that the load measuring device is fixed relative to the elevator car in the force direction;
• wherein the force transmission element is operatively connected to the brake to measure a force acting between the brake and the load measuring device due to a displacement of the brake relative to the load measuring device, the load measuring device generating an electrical signal representing the force acting on the force transmission element;
• and
• wherein the load measuring device holding arrangement and the brake holding arrangement are connected to one another in an elastically deformable manner via a connecting piece arrangement, the connecting piece arrangement deforming elastically when a force corresponding to a weight of the elevator car including a maximum permissible payload of the elevator car is transmitted between the brake holding arrangement and the load measuring device holding arrangement, and the connecting piece arrangement extends transversely to the force direction at least in a sub-region of the connecting piece arrangement.