Patent ID: 11858780
Assignee: OTIS ELEVATOR COMPANY
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 10:
11. An elevator safety device, comprising:
a governor assembly comprising:
a bracket;
a rotatable rope sheave mounted on the bracket; and
a centrifugal mechanism associated with the rope sheave;
wherein, the centrifugal mechanism comprises:
a plurality of centrifugal members pivotally connected to the rope sheave, the plurality of centrifugal members being capable of unfolding under an inertial force associated with the speed of the rope sheave; and
a retaining mechanism by which the plurality of centrifugal members are retained in a contraction position;
wherein, the retaining mechanism is configured to retain the plurality of centrifugal members in the contraction position when the speed of the rope sheave increases to a first threshold with an acceleration smaller than a first acceleration; and
a transmission device associated with the governor assembly;
wherein, when the centrifugal mechanism is at a second triggering position, the plurality of centrifugal members couple the rope sheave with the core ring, so that when the rope sheave rotates in a direction corresponding to a descent direction of the car, the core ring and the rocker arm connected to the core ring rotate, which drives the safety gear through the transmission device, and wherein, the transmission device comprises a first component and a second component connected to each other through a pivot pin and a vertically oriented elongated hole, so that during an initial stroke of the rocker arm rotation, the pivot pin first moves in the elongated hole until the pivot pin engages with an end of the elongated hole, and then the rotation of the rocker arm is transmitted to the safety gear, thereby triggering the safety gear to be in frictional contact with the elevator guide rail.