Patent ID: 11873194
Assignee: WITTUR HOLDING GMBH
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A braking device for an elevator with a rail-guided car, wherein the braking device comprises:
a basic body for mounting on the car or on a counterweight which, when properly installed, encompasses a guide rail and holds a first braking element in position on a first side of the guide rail and holds a second braking element in position on a second side of the guide rail opposite the first side of the guide rail,
wherein at least one of the first and second braking elements is held in a standby position, at a distance from the guide rail, by a switchable retaining magnet against a force of an automatic actuator,
such that, when switching the retaining magnet, one of the first and second braking elements is pressed by the actuator against the guide rail, away from the retaining magnet, so that an air gap between the retaining magnet and the first or second braking element occurs or becomes larger,
wherein the braking device is designed in such a way that the first or second braking element is automatically driven in between the basic body and the guide rail, if the car moves more than just insignificantly at a point in time at which the first or second braking element abuts against the guide rail,
wherein the retaining magnet is equipped with an air gap reducing agent, which prevents the first or second braking element from being attracted again, which reduces or eliminates the air gap between the retaining magnet and the first or second braking element which is triggered but not yet having a braking effect and contacting the rail, which has not yet been driven in between the guide rail and the basic body in such a way that the retaining magnet keeps the first or second braking element magnetically trapped again, as soon as the retaining magnet is switched accordingly,
wherein the force generated by the actuator is smaller than the force generated by the retaining magnet.