A braking system for a hoisted structure guided along a guide rail is provided. The braking system includes a brake member for coupling to the hoisted structure and having a brake surface configured to frictionally engage the guide rail, the brake member moveable between a braking position and a non-braking position. Further included is a brake member actuation mechanism operatively coupled to the brake member and configured to actuate the brake member from the non-braking position to the braking position, the brake member actuation mechanism remaining coupled to the brake member in the braking position to control the braking force applied on the hoisted structure by the frictional engagement between the guide rail and the brake member.

An electronic safety actuation device for braking an elevator car includes a safety brake movable between a non-braking position and a braking position, a first electronic safety actuator operably coupled to the safety brake via a first link member, and a second electronic safety actuator operably coupled to the safety brake via a second link member. Operation of the first electronic safety actuator applies a force to the first link member to move the safety brake from the non-braking position to the braking position. Operation of the second electronic safety actuator applies a force to the second link member to move the safety brake from the non-braking position to the braking position.

An over-speed detection device (OSDD) and over-speed governor (OSG) for a stairlift is tripped by flyweights which displace from a rotational axis of the OSDD/OSG when subjected to an over-speed. The outward displacement of the flyweights is converted into an axial displacement to effect triggering of the OSG. This ensures that the tripping speed is independent of the angle if inclination of the stairlift rail. The OSDD/OSG may be mounted so that it takes its drive from a convex surface of the rail in negative transition bends. This ensures that the speed of the OSDD/OSG is maintained close to the tripping speed even when the carriage is slowed to traverse the negative transition bend.

A governor assembly is provided including a sheave rotatably mounted on a shaft and a ratchet disc mounted on the shaft. Rotation of the ratchet disc is restricted. An overspeed assembly includes a swing jaw mounted to the sheave. The swing jaw is movable between a normal position and a tripped position. The swing jaw is biased into the tripped position. When the swing jaw is in the tripped position, rotation of the sheave in a first direction is restricted. A tripping lever is pivotally mounted to the sheave and is configured to cooperate with the swing jaw. Rotation of the sheave in a second, opposite direction is configured to automatically move the swing jaw against its bias to the normal position.

An illustrative example elevator system includes an elevator car, a machine that selectively causes movement of the elevator car, and a drive that controls the machine to control movement of the elevator car at an intended elevator car speed. The drive is configured to use information regarding operation of the machine to determine whether an abnormal passenger behavior (APB) condition exists that affects movement of the elevator car. The drive is configured to alter the elevator car speed when the APB condition exists.

Embodiments herein are directed to an elevator counterweight governor assembly for an elevator assembly. The elevator counterweight governor assembly includes a swing arm, a first pulley assembly, a second pulley assembly, a third pulley assembly, and a braking assembly. The swing arm is pivotally coupled to the at least one inner beam at one end. The swing arm is configured to pivot between a disengaged position and an engaged position. The braking assembly is configured to move between an unactivated state where the braking assembly is free from the fixed member and an activated state where the braking assembly engages with the fixed member to inhibit movement of the counterweight frame. When the swing arm is in the disengaged position, the braking assembly is in the unactivated state and when the swing arm is in the engaged position, the braking assembly is in the activated state.

An elevator safety gear actuation device for actuating an elevator safety gear comprises a first member and a second member. The first and second members are arranged opposite to each other defining a gap configured for accommodating a guide member extending in a longitudinal direction. At least one of the engagement members comprises an engagement element which is movable in a direction transverse to the longitudinal direction between a disengaged position and an engaged position. The first engagement element comprises at least one permanent magnet which is configured for being magnetically attracted and attaching to the guide member extending through the gap when the engagement element is arranged in the engaged position. The second member comprises at least one additional permanent magnet which is configured for being magnetically attracted to the guide member extending through the gap.

An elevator safety gear actuation device for actuating an elevator safety gear comprises a first member and a second member. The first and second members are arranged opposite to each other defining a gap configured for accommodating a guide member extending in a longitudinal direction. At least one of the engagement members comprises an engagement element which is movable in a direction transverse to the longitudinal direction between a disengaged position and an engaged position. The first engagement element comprises at least one permanent magnet which is configured for being magnetically attracted and attaching to the guide member extending through the gap when the engagement element is arranged in the engaged position. The second member comprises at least one additional permanent magnet which is configured for being magnetically attracted to the guide member extending through the gap.

A speed governor assembly and an elevator system. The speed governor assembly includes: a sheave; a centrifugal mechanism mounted on the sheave and rotating together with the sheave; an overspeed protection switch at a first distance from a radial outer side of the centrifugal mechanism; a core ring disposed coaxially with the sheave; and a triggering arm rotating together with the core ring; wherein the centrifugal mechanism engages with the core ring and drives the core ring and the triggering arm to rotate when the sheave reaches a second speed, and the rotation of the triggering arm can contact and trigger the overspeed protection switch.

The present disclosure provides a lift running speed measurement method and system. Record a q.sup.th start time of a lift when the lift starts on a start floor, and record a q.sup.th stop time and a q.sup.th floor number when the lift stops running on a q.sup.th destination floor. Compute a q.sup.th time difference between the q.sup.th stop time and the q.sup.th start time. If the q is less than the statistic times Q, record q=q+1 and return to carry out the step of starting the lift on the start floor; if the q is greater than or equal to the statistic times Q, respectively compute a difference between a time difference of each value from 2.sup.nd to Q.sup.th and a 1.sup.st time difference, and a difference between a floor number of each value from 2.sup.nd to Q.sup.th and a 1.sup.st floor number.