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公开(公告)号：US11897730B1
公开(公告)日：2024-02-13
申请号：US17987562
申请日：2022-11-15
Applicant: Otis Elevator Company
Inventor： Javier Muñoz Sotoca
Abstract: A frictionless safety brake actuator, for use in an elevator system, includes at least two stators; a magnet array positioned between the stators; a linkage attached to the magnet array; and a biasing arrangement. The linkage is actuatable to move a safety brake into frictional engagement with an elevator guide rail. The magnet array is moveable between a first position in which the linkage is actuated and a second position in which the linkage is not actuated. The biasing arrangement is arranged to bias the magnet array towards the first position. The magnet array includes a first magnet set and a second magnet set which comprise at least one magnet each and at least three magnets in total. The magnet(s) of the first magnet set is/are arranged alternately with the magnet(s) of the second magnet set in a stack.
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公开(公告)号：US20220144588A1
公开(公告)日：2022-05-12
申请号：US17392902
申请日：2021-08-03
Applicant: Otis Elevator Company
Inventor： Javier Muñoz Sotoca
Abstract: An adjustable force safety brake for use in an elevator system. The adjustable force safety brake includes a safety block, first and second braking elements housed in the safety block and an electromagnet. The safety block includes a channel arranged to receive a guide rail of an elevator system in use. The first braking element is configured to move from an initial position into a position of engagement with the guide rail received in the channel to create a braking force, and the second braking element is configured to create an additional braking force on the guide rail when the first braking element is in the position of engagement. The electromagnet is operable to selectively produce a magnetic force which acts on the second braking element in a sideways direction away from the channel so as to reduce the additional braking force on the guide rail.
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