Patent ID: 11897725
Assignee: OTIS ELEVATOR COMPANY
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 11:
12. An elevator system comprising:
a hoistway;
an elevator car movable along the hoistway;
a machine operably connected to the elevator car to urge movement of the elevator car along the hoistway;
an electromagnetic brake operably connected to an elevator car; and
a control circuit operably connected to the electromagnetic brake, the control circuit including a switching mechanism configured to selectively modify a rate of engagement of the electromagnetic brake to selectively modify a rate of deceleration of the elevator car;
wherein the switching mechanism has a first position, a second position and a third position, to selectively modify the rate of engagement;
wherein in the first position the switching mechanism closes on a first pathway to direct electrical current along the first pathway having a snubber diode to slow dissipation of current in the control circuit in an event of a loss of AC power to the control circuit; and
wherein in the second position the switching mechanism closes on a second pathway to direct electrical current along the second pathway arranged in parallel to the first pathway and including a snubber diode and a resistor; and
wherein in the third position the switching mechanism is in an open position such that deceleration is not delayed.