An overload protection device for cable lines, and in particular in cranes, is provided, having at least one electronic overload safety means. The overload protection device is provided to prevent any kind of damage which can be caused by an overload. That is achieved by providing a mechanical or magnetic overload protection device (1) in addition to the electronic overload safety means. The overload protection device (1) is integrated into the cable line or arranged at the cable fixing point and responds when a permissible cable tension force is exceeded and implements a cable extension.

An overload protection device for cable lines, and in particular in cranes, is provided, having at least one electronic overload safety means. The overload protection device is provided to prevent any kind of damage which can be caused by an overload. That is achieved by providing a mechanical or magnetic overload protection device (1) in addition to the electronic overload safety means. The overload protection device (1) is integrated into the cable line or arranged at the cable fixing point and responds when a permissible cable tension force is exceeded and implements a cable extension.

An exemplary brake device includes a brake element configured to apply a braking force to resist rotation of an associated component. A mounting member is configured to mount the brake device to a stationary surface. The mounting member is at least partially moveable relative to the stationary surface responsive to a torque on the brake device. A sensor provides an indication of a force associated with any movement of the mounting member relative to the stationary surface responsive to the torque.

Embodiments are directed to calculating a current associated with a motor of an elevator based on an output of a speed regulator, and controlling the elevator based on the current. Embodiments are directed to examining a feeder current obtained via a converter current sensor of a regenerative drive during a peak power condition, and regulating a speed of an elevator based on the feeder current.

An elevator installation and a method of operating the elevator system for temporary transportation of an overload within the elevator installation includes a car and a counterweight interconnected by one or more suspension ropes engaging a traction sheave that is driven by a motor. The traction between the suspension ropes and the traction sheave is enhanced independently of the counterweight for intended overload operation.

An elevator installation and a method of operating the elevator system for temporary transportation of an overload within the elevator installation includes a car and a counterweight interconnected by one or more suspension ropes engaging a traction sheave that is driven by a motor. The traction between the suspension ropes and the traction sheave is enhanced independently of the counterweight for intended overload operation.

The object of the invention is a method and an apparatus for measuring the load of an elevator car, which elevator comprises at least a hoisting machine plus shaft, said hoisting machine being provided with a motor, and a traction sheave fitted onto the shaft, and also a brake, and in which solution the load of an elevator car is measured by the aid of a measuring means. The load of the elevator car is measured with the measuring means from the shaft of the traction sheave of the hoisting machine.

The object of the invention is a method and an apparatus for measuring the load of an elevator car, which elevator comprises at least a hoisting machine plus shaft, said hoisting machine being provided with a motor, and a traction sheave fitted onto the shaft, and also a brake, and in which solution the load of an elevator car is measured by the aid of a measuring means. The load of the elevator car is measured with the measuring means from the shaft of the traction sheave of the hoisting machine.

A method for detecting an overload condition of an elevator car of an elevator includes obtaining prevailing car-load information from a load weighing device arranged to weigh a prevailing car-load preferably when the elevator car is standing at a landing floor in an elevator shaft; determining if said prevailing car-load information fulfils one or more overload criteria; and generating a signal indicating an overload condition of an elevator car, if said car-load information fulfils one or more of said overload criteria; obtaining information of at least one operational parameter of the elevator; and adjusting one or more of said overload criteria or said car-load information based on said information of the at least one operational parameter of the elevator. An overload monitoring system and an elevator implementing the method are also disclosed.

A rope load detecting device for detecting total rope load in multiple elevator ropes, includes a frame held on the multiple elevator ropes, and a force sensing element. The frame includes a tension beam, a first and second connecting bars, a movable member and a supporting beam, one end of the first and second connecting bars is fixed to the tension beam, the other end is fixed to the supporting beam, one end of the movable member is connected to the tension beam, the other end freely passes the supporting beam. The frame is configured to enable the part of each elevator rope passing through the first and second connecting bars and the movable member of the frame to be bent so that enable the force caused by each loaded elevator rope to act on the force sensing element by means of the movable member of the frame, whereby the total rope load in multiple elevator ropes can be detected by a single force sensing element.