US 12,065,331 B2
Brake system for an elevator
Catherine Drouet, Bulle (CH)
Assigned to INVENTIO AG, Hergiswil (CH)
Appl. No. 18/551,890
Filed by Inventio AG, Hergiswil (CH)
PCT Filed Mar. 4, 2022, PCT No. PCT/EP2022/055520
§ 371(c)(1), (2) Date Sep. 22, 2023,
PCT Pub. No. WO2022/207232, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 21166445 (EP), filed on Mar. 31, 2021.
Prior Publication US 2024/0174488 A1, May 30, 2024
Int. Cl. B66B 5/18 (2006.01); B66B 1/36 (2006.01)
CPC B66B 5/18 (2013.01) [B66B 1/36 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A brake system for an elevator system, the brake system comprising:
a first brake circuit;
a second brake circuit;
a control unit being connected to the first brake circuit and to the second brake circuit;
the first brake circuit and second brake circuit each including a brake, each of the brakes having an actuator and a main spring unit, the actuator being preloaded by the main spring unit in a closing direction of the brake with a force required for application of a braking force by the brake, and the actuator being activated by a control signal from the control unit, the control signal compensating the preloaded force of the main spring unit, and thereby releasing the brake;
the control unit generating the control signal as a first control signal for the first brake circuit and a second control signal for the second brake circuit, the control unit selectively generating neither of the first and second control signals, only the first control signal, only the second control signal, and both of the first and second control signals; and
wherein the control unit, when generating only the first control signal or only the second control signal, selects between the first control signal and the second control signal such that a ratio of a number of activations of the first brake circuit and the number of activations of the second brake circuit aims for a predetermined fixed ratio.