Patent ID: 11970367
Assignee: OTIS ELEVATOR COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 0:
1. An elevator system (50) comprising a guide rail (56; 110), an elevator car (54), a safety brake actuator (100; 200; 300; 400) and a safety brake (58), wherein the safety brake actuator (100; 200; 300; 400) and the safety brake (58) are mounted to the elevator car (54) to move along the guide rail (56; 110) with the elevator car (54) in use;
wherein the safety brake actuator (100; 200; 300; 400) comprises:
an actuation mechanism (102) configured in use to actuate the engagement of the safety brake (58) against the guide rail (56; 110), wherein the actuation mechanism 102 includes a brake pad (104) having a permanent magnet (104a), an electromagnet (106) and at least one biasing spring (108), the electromagnet (106) configured to generate a repulsive magnetic force repelling the permanent magnet (104a) and propelling the brake pad (104) towards the guide rail (56; 110);
a proximal surface (117; 203; 302), wherein the safety brake actuator (100; 200; 300; 400) is mounted adjacent to the guide rail (56; 110) with the proximal surface (117; 203; 302) facing the guide rail (56; 110) and spaced from the guide rail (56; 110) to define a clearance gap (118) between the guide rail (56; 110) and the proximal surface (117; 203; 302) of the safety brake actuator (100; 200; 300; 400); and
an object-diverting arrangement (122; 204; 304; 402) positioned relative to the clearance gap (118) to prevent or impede the entry of foreign objects into the clearance gap (118);, a linkage (114) connecting the brake pad (104) to the safety brake (58).