Abstract: A method and a device monitor operating parameters in a passenger transport installation, such as an elevator or an escalator, having a plurality of sensors detecting different operating parameters and a signal processing device. The method steps include: repeatedly detecting a first operating parameter with a first of the sensors; triggering a second of the sensors as soon as the first operating parameter assumes a predetermined trigger characteristic; detecting a second operating parameter with the second sensor and transmitting a signal reproducing the detected second operating parameter to the signal processing device in response to the triggering; and processing the signal in the signal processing device or an external monitoring device for monitoring the second operating parameter. The method and device reduce a data processing amount and/or a data transmission amount, reduce a need for wiring and achieve complex sensor functions with the simple sensors that cooperate with one another.

Abstract: A winding overhang (20) configured for supporting windings of an electric motor (40) comprise a cylindrical wall (22) extending around a center axis (A). The cylindrical wall (22) includes a plurality of grooves (28a-28e) formed along the circumference (37, 38) of the cylindrical wall (22), each groove (28a-28e) having a constant width (W) along the circumference (37, 38); and a plurality of openings (26) having different heights (H1, H2, H3, H4, H5). Each opening (26) extends from an end surface (36) of cylindrical wall (22) and allows a wire (30a-30c) to pass between an outer area (34) outside the cylindrical wall (22) and an inner space (32) defined by the cylindrical wall (22).

Abstract: Elevator systems and methods are provided. The systems include a traveling component movable along a guide rail within an elevator shaft, an elevator machine operably connected to the traveling component and including a machine brake, and an overspeed safety system. The overspeed safety system includes a safety brake and an electromechanical actuator, the brake engageable with the guide rail. A safety system controller operably connects to the electromechanical actuator and triggers the electromechanical actuator due to at least a detected triggering event. A temporary power supply is operably connected to the overspeed safety system to provide power in the event of a power failure.

Abstract: An illustrative example elevator governor includes at least one flyweight configured to move a first distance between an initial position corresponding to a zero speed condition and an activation position corresponding to an elevator speed that reaches a predefined threshold. A biasing member biases the at least one flyweight toward the initial position. The biasing member is configured to allow the at least one flyweight to reach the activation position when the elevator speed reaches the predefined threshold. A flyweight position member sets a rest position of the at least one flyweight in the zero speed condition that is between the initial position and the activation position. A range of motion of the at least one flyweight is limited to a second, shorter distance between the rest position and the activation position.

Abstract: An overspeed assembly for use with a governor assembly for limiting of an elevator system, the overspeed assembly includes a rod movable relative to the governor assembly in response to a speed of an elevator car and a pin coupled to the rod. The pin is movable between a first position and a second position based on a direction of travel of the elevator car. The pin is configured to engage a first component to indicate a first overspeed condition when the elevator car is travelling in a first direction and the pin is configured to engage a second component to indicate a second overspeed condition when the elevator car is travelling in a second, opposite direction.

Abstract: A control system includes a plurality of control devices each including an initial check unit that performs an initial check before drive control of a rotary electric machine, a transmission/reception unit that transmits/receives an end signal indicating that the initial check is ended, and a drive control unit that performs the drive control of the rotary electric machine after the initial check. The drive control unit starts the drive control of the rotary electric machine when the initial check of the corresponding control device is ended and the end signal is acquired from another control device, and starts the drive control of the rotary electric machine after a lapse of a predetermined time from the start of the initial check of the corresponding control device when the initial check of the corresponding control device is ended and the end signal is not acquired from the another control device.

Abstract: An elevator system (100) includes an elevator car (102) that is configured to travel along a guide rail (104), and a braking assembly (116) coupled to the elevator car (102). The braking assembly (116) is configured to selectively operate in a disengagement mode that allows the elevator car (102) to travel along the guide rail (104), and an engagement mode that inhibits the elevator car (102) from traveling along the guide rail (104). The electronic braking assembly controller (128) is in signal communication with the braking assembly (116) and is configured to generate an electronic braking signal that activates the engagement mode of the braking assembly (116). When the engagement mode is activated, the elevator car (102) decelerates without exceeding a predetermined g-force (g) threshold regardless as to whether a load applied to the elevator car (102) changes such that the elevator car (102) is stopped at a floor landing (106).

Abstract: A hoist system having a drum primarily self-contained within a batten, for raising and lowering lighting, sound equipment, curtains and the like, often in a performance environment. The compact system is highly scalable to a variety of spaces and applications, including school and public theaters and concert halls, as well as some homes, private business, etc. The hoist system may be adapted with safety mechanisms including an overspeed detector, which may comprise a centrifugal detection mechanism coupled to an elongate member of the system; dampening means; a compact mechanism for trimming or adjusting an operative length of elongate member; stabilizing pipe shaft bearings; elongate member diverter pulley mechanisms load balancing termination points. Additional features include various alternative combination hoist implementations and orientations, and alternative incorporated attachment mechanisms for use with the hoist system.

Abstract: In an elevator installation, an elevator car is movably arranged alongside guide rails and the elevator car is equipped with a brake system with preferably two safety brakes. A movement monitoring system monitors the movement parameters of the elevator car and triggers corresponding warnings or safety measures, if permissible threshold values are exceeded or it provides determined adjusted movement parameters to an elevator control. The movement monitoring system determines a first movement parameter in a time interval and detects an acceleration of the elevator car. The movement monitoring system determines the time interval for determining the adjusted movement parameter as a function of the detected acceleration.

Abstract: In an elevator apparatus, a car is suspended by a suspending means. The car is raised and lowered by a driving apparatus by means of the suspending means. The car is braked by a braking apparatus. An abnormal acceleration detecting mechanism operates the braking apparatus to stop the car if acceleration that exceeds a preset set value arises in the car.

Abstract: A governor system for an elevator is disclosed. The governor includes a shaft horizontally extending from a sheave of the governor system. A base, spring, and slider are mounted on the shaft with linkages extending from the base of the sheave to at least one flyweight. The spring and flyweights are sized such that centrifugal force will be sufficient to overcome the biasing force of the spring upon the sheave reaching a certain rotational speed. Overspeed sensors and mechanical switches are positioned proximate the flyweights and flyweights plates such that upon such motion of the flyweights, the governor system is triggered, thereby slowing and ultimately stopping the elevator. The governor system has a greatly reduced space requirement compared to previous governors, as well as a reduced likelihood of false trips due to acceleration or deceleration of the car.

Abstract: An encoder assembly is disclosed. The encoder assembly comprises a motor having a rotor, and an encoder. The encoder comprises an encoder wheel axially coupled to the rotor, a first sensor configured to detect a first velocity at which a portion of the encoder wheel moves relative to the first sensor, and a second sensor configured to detect a second velocity at which a portion of the encoder wheel moves relative to the second sensor, the first sensor and the second sensor positioned approximately 180 degrees apart from each other about an axis of rotation of the rotor.

Abstract: The invention relates to a method and an apparatus. In the method there is determined a speed limit or an acceleration limit for an elevator car based on elevator state information, the elevator state information comprising at least information on whether the elevator car is being driven or whether the elevator car is in a floor. Power supply to the motor is disabled and brakes are applying for braking movement of the elevator car. Speed or acceleration of the elevator car is measured, in response to the applying of the at least one brake and the disabling of the power supply to the motor. It is determined whether the at least one of speed and acceleration of the elevator car exceeds the respective at least one of the speed limit and the acceleration limit. Thereupon, power supply to the motor is enabled for stabilizing movement of the elevator car.

Abstract: Provided is an elevator governor capable of achieving, with a simple configuration, an overspeed detection mechanism to which rotation dependence is added while preventing a decrease in reliability due to the generation of vibrations and noises and the wear of parts.

Abstract: A mechanism for use in an elevator governor assembly including a ground configured to rotate about a ground axis, three or more circumferentially overlapping cams each pivotally attached to the ground at one of three or more ground pivot points radially spaced from the ground axis, and a plurality of links pivotally attaching the three or more cams to one another at a plurality of link pivot points. The circumferentially overlapping cams form a substantially contiguous circular ring about the ground axis. The interconnection of the ground, the cams, and the links form a generally circular mechanism.

Abstract: A system and method for controlling speed of an elevator car in an elevator system is disclosed. The elevator car may have a speed governor adapted to trip when an electrical tripping point of the speed governor is reached. The elevator system may also have a control system for controlling operation of the elevator car, the control system providing a speed reducing switch adapted to trip when a software tripping point of the speed reducing switch is reached, the software tripping point being reached before the electrical tripping point of the speed governor.

Abstract: A speed limiter for an elevator system includes: at least one speed limiter wheel having a first radial cam with lobes, and at least a second, phase-shifted radial cam with lobes; a first mass, which is rotatably arranged in a first pivot bearing and which together with a first roller rolls on the first radial cam such that the first mass follows a first oscillating motion when the speed limiter wheel rotates; and a second mass, which is rotatably arranged in a second pivot bearing and which together with a second roller rolls on the second radial cam such that the second mass follows a second oscillating motion when the speed limiter wheel rotates.

Abstract: An elevator car braking apparatus includes a gear drive assembly for compressing one or more springs which are coupled by a cam follower to one or a pair of brake shoes. When the springs are released from a compressed state, the brake shoes engage and grip hoisting ropes, part of the hoisting apparatus or the car guide rails, within a predetermined time from the start of a brake application cycle. During a brake application cycle, the springs move the cam follower along cam surfaces shaped and disposed to cause the cam follower to move at least one of the brake shoes toward the other brake shoe. The gear assembly includes clutch means for disengaging from and engaging with a gear or axle of the gear assembly during decompression and compression of the springs, respectively. A resilient material in the braking apparatus initially accelerates movement of the cam follower when the springs begin to decompress, and may protect gears of the gear assembly from damage at the end of a brake release cycle.

Abstract: A method and apparatus for determining the movement and/or the position of an elevator car include a first monitoring unit for analyzing first signals of a first sensor device for obtaining information about the movement and/or the position of the elevator car, for detecting a possible faulty behavior of the elevator system, and for initiating corresponding safety measures. A second sensor device, which does not operate on the principle of the first sensor device, registers changes of the movement state of the elevator car and emits corresponding second signals to a second monitoring unit that analyzes the second signals and detects changes of the movement state of the elevator car. A fault signal is generated if the movement signals that are obtained from the first monitoring unit are incoherent with the changes of the movement state of the elevator car that are detected by the second monitoring unit.

Abstract: An adjustment device for controlling the electric drive of an elevator in connection with a voltage reduction of the supplying network is disclosed. The electric drive of an elevator includes an electric motor and a power supply apparatus of for adjusting the supply voltage of the electric motor. The adjustment device includes a device configured to control the power supply apparatus and also a speed regulator for adjusting the speed of the electric motor. The adjustment device is arranged to determine the output voltage of the power supply apparatus of the electric motor in relation to the permitted maximum value of the output voltage, and the adjustment device is arranged to interrupt the operation of the speed regulator but to continue the operation of the power supply apparatus of the electric motor when the output voltage of the power supply apparatus of the electric motor reaches the permitted maximum value.

Abstract: An actuator for a speed governor of an elevator system includes a governor wheel equipped with at least two flyweights. The governor wheel can be driven by a governor cable looped around it. An actuator wheel is stationary in a basic position. A coupler engages the actuator wheel when the governor wheel attains an actuation speed and thus couples with the governor wheel so that the actuator wheel is caused to rotate. An elastic material, preferably transmitting a high degree of friction, is provided between the coupler and the actuator wheel. The actuator wheel has a lining or tyre of the elastic material and/or the coupler is equipped with the elastic material.

Abstract: A governor system for an elevator is disclosed. The governor includes a shaft horizontally extending from a sheave of the governor system. A base, spring, and slider are mounted on the shaft with linkages extending from the base of the sheave to at least one flyweight. The spring and flyweights are sized such that centrifugal force will be sufficient to overcome the biasing force of the spring upon the sheave reaching a certain rotational speed. Overspeed sensors and mechanical switches are positioned proximate the flyweights and flyweights plates such that upon such motion of the flyweights, the governor system is triggered, thereby slowing and ultimately stopping the elevator. The governor system has a greatly reduced space requirement compared to previous governors, as well as a reduced likelihood of false trips due to acceleration or deceleration of the car.

Abstract: An elevator system 40 includes an electronic system 48 capable of triggering a machine room brake and an electromagnetic safety trigger 46 with low hysteresis and with minimal power requirements that can be released to engage safeties 70A, 70B when car over-speed and/or over-acceleration is detected. The electromagnetic trigger 46 may be reset automatically and may be released to engage the safeties 70A, 70B during the reset procedure. The system includes an over-speed and over-acceleration detection and processing system that is configured to decrease response time and to reduce the occurrence of false triggers caused by conditions unrelated to passenger safety, such as passengers jumping inside the elevator car 16.

Abstract: An elevator governor capable of setting first overspeeds different between a rising time and a descending time by a simple configuration and at a low cost without the need for electric power supply from the outside. For this purpose, a weight that is moved in a predetermined direction by receiving a centrifugal force according to a travel speed at the rising time and the descending time of a car, an elastic body urged by movement of the weight having received the centrifugal force, and an actuating device actuates a stop switch when the weight having received the centrifugal force moves to a predetermined position against an urging force of the elastic body are provided, and also a switching device driven by the rising/descending operation of the car is provided. By the switching device, the length of the elastic body at the time when the actuating devices actuates the stop switch is switched to a length different according to the rising/descending direction of the car.

Abstract: Provided is an elevator governor capable of achieving, with a simple configuration, an overspeed detection mechanism to which rotation dependence is added while preventing a decrease in reliability due to the generation of vibrations and noises and the wear of parts.

Abstract: An exemplary elevator system includes an elevator car. A (22,42) car status indicator (60) provides information indicative of every position of the car and the velocity of the car. A controller (70) controls elevator car movement responsive to an indication from the car status indicator (60) that the elevator car is moving too fast near a landing corresponding to a scheduled stop of the elevator car.

Abstract: An elevator system comprises an elevator car and a counterweight fixed to a traction means. A drive pulley moves the traction means. A bottom tensioning means is fixed to the counterweight and to the elevator car. A tensioning means weight tensions the bottom tensioning means. In an end position of the counterweight, the elevator car can continue to move when the traction means is moved further by the drive pulley. This moves the tensioning means weight at half the speed of the elevator car, for example. A measuring device is provided for the tensioning means weight for detecting such a motion of the tensioning means weight. This allows a triggering of an emergency stop of the elevator car.

Abstract: A hoisting machine having a load hoisting motor and a speed reduction mechanism and driving the load hoisting motor with an inverter 12 incorporated in the hoisting machine main body is provided with a heat dissipation means that dissipates heat generated from the inverter 12 to a speed reduction mechanism casing 15 that houses the speed reduction mechanism. The heat dissipation means is a means for attaching the inverter 12 directly to the speed reduction mechanism casing 15 in close contact therewith through surface contact at least a part of the inverter 12.

Abstract: An apparatus in an elevator for detecting and stopping an uncontrolled movement of the car when a machine brake intended to keep the elevator car immovable is on. The apparatus comprises a motion detector (1) for detecting movement of the car (2) and the length of the movement when the machine brake is on (10), a stopping device (3) for stopping an uncontrolled movement of the car, and limit and control means (4) for defining an allowed car movement and controlling the operation of the stopping device according to information obtained from the motion detector.

Abstract: In an emergency stop system for an elevator, a governor sheave that moves in synchronism with the raising and lowering of a car is wound around a governor sheave. The car is mounted with a safety device for braking the car through displacement of the car, which is connected to the governor rope, with respect to the governor rope. A control device outputs an activation signal upon detecting an abnormality in the speed of the car. A rope catching device is provided in the vicinity of the governor sheave. The rope catching device has an electromagnetic actuator that is activated upon input of the activation signal, and a restraining portion for restraining the governor rope upon the activation of the electromagnetic actuator.

Abstract: A control circuit for controlling an electromechanical elevator brake is disclosed. The control circuit includes at least one brake coil (L1), a direct-voltage source (BR1), a semiconductor switch arrangement, a current measuring unit, at least two semiconductor switches, and a control unit (CO1) for controlling operation of the circuit. The current measuring unit (Lm1) produces current data that is passed to the control unit (CO1). The at least two semiconductor switches (SW1, SW2) are controlled by the control unit (CO1) such that operation is alternated between the two so that the working condition of each switch can be checked in its turn on the basis of feedback data obtained from the current measuring unit.

Abstract: The invention relates to a method for controlling a braking unit of a rope transport installation and braking unit. The command signals of a first brake are modulated, until the installation is stopped, by a first modulation circuit integrated in the control unit to automatically regulate the running speed of the rope according to a first predetermined deceleration setpoint curve activated by a braking order. The command signals of a second brake are simultaneously modulated by a second modulation circuit integrated in the control unit to automatically regulate the running speed of the rope according to a second predetermined deceleration setpoint curve activated by the braking order, the instantaneous value of the second setpoint curve being at all times greater than the value of the first setpoint curve.

Abstract: The invention relates to a fail-safe power control apparatus (3) for supplying power between an energy source (4) and the motor (5) of a transport system. The power control apparatus comprises a power supply circuit (6), which comprises at least one converter (7, 8) containing controllable change-over switches (32), and the power control apparatus comprises means (24) for controlling the converter change-over switches, a data transfer bus (10), at least two controllers (1, 2) adapted to communicate with each other, and a control arrangement (11) for controlling a first braking device, and possibly a control arrangement (43) for controlling a second braking device.

Abstract: An elevator governor capable of setting first overspeeds different between a rising time and a descending time by a simple configuration and at a low cost without the need for electric power supply from the outside. For this purpose, a weight that is moved in a predetermined direction by receiving a centrifugal force according to a travel speed at the rising time and the descending time of a car, an elastic body urged by movement of the weight having received the centrifugal force, and an actuating device actuates a stop switch when the weight having received the centrifugal force moves to a predetermined position against an urging force of the elastic body are provided, and also a switching device driven by the rising/descending operation of the car is provided. By the switching device, the length of the elastic body at the time when the actuating devices actuates the stop switch is switched to a length different according to the rising/descending direction of the car.

Abstract: Method and system for detecting and stopping uncontrolled movement of the car (1) in an elevator. In the method movement of the car is detected with the first movement detection means (2, 3, 4, 5, 6) when the brake (8) of the drive machinery (7) is in the braking status with the purpose of holding the car in its position without moving. A first control signal is formed if the car moves in the aforementioned situation. Movement of the car is stopped on the basis of the first control signal with a separate stopping appliance (9) with respect to the brake of the drive machinery. The operating condition of the first movement detection means are tested with the second movement detection means (10, 11, 12) during driving of the car in order to detect a fault situation. A second control signal is formed for the elevator control when a fault situation is detected, in which case the elevator control drives the car to the next stopping floor and prevents the subsequent run of the car.

Abstract: In an elevator apparatus, a car is mounted with an safety device for bringing the car to an emergency stop. A drive unit for raising and lowering the car is controlled by a drive control portion. A safety control portion detects an abnormality in the elevator and outputs an actuation signal. An electrical actuator portion actuates the safety device in response to an actuation signal output from the safety control portion. A mechanical actuator portion mechanically detects an abnormality in the elevator, and actuates the safety device through mechanical transmission of a control force. In the event of power failure, a backup power source enables functioning of at least the drive unit and of the drive control portion.

Abstract: In an elevator apparatus, a car ascends and descends based on a running speed pattern generated by a control panel. Destination floor buttons and landing buttons are connected to an over speed monitoring portion without the intervention of the control panel. The over speed monitoring portion has an over speed setting portion for setting first and second over speeds based on car position information obtained from a car position detector and call registration information obtained from the destination floor buttons and the landing buttons. In the over speed setting portion, a running speed pattern different from the running speed pattern generated by the control panel is independently generated without depending on information from the control panel. The first and second over speeds are set based on the running speed pattern generated by the over speed setting portion.

Abstract: In the invention a method is presented for ensuring operating safety in an elevator system, an elevator system, and a safety device of an elevator system. The elevator system includes at least an elevator car, elevator ropes, an elevator motor, a traction sheave and at least two holding brakes, which holding brakes are arranged to prevent movement of the elevator car when the elevator is stopped. According to the invention the first holding brake is engaged at the end of an elevator run, and the other holding brakes are engaged with a delay. When one holding brake is engaged, the state of motion of the elevator and any slipping of the brake is monitored. If the brake is detected as slipping, a procedure for preventing a hazardous situation is performed.

Abstract: In an elevator apparatus, a car ascends and descends based on a running speed pattern generated by a control panel. Destination floor buttons and landing buttons are connected to an over speed monitoring portion without the intervention of the control panel. The over speed monitoring portion has an over speed setting portion for setting first and second over speeds based on car position information obtained from a car position detector and call registration information obtained from the destination floor buttons and the landing buttons. In the over speed setting portion, a running speed pattern different from the running speed pattern generated by the control panel is independently generated without depending on information from the control panel. The first and second over speeds are set based on the running speed pattern generated by the over speed setting portion.

Abstract: The invention relates to an elevator installation comprising at least one car, which has a safety gear and with which a control unit, a drive and a brake are associated, and further comprising a safety device for avoiding a collision of the car with an obstacle, another car or an end of the shaft, it being possible by means of the safety device to compare an actual distance of the car from an obstacle, another car or an end of the shaft with a minimum distance and a critical distance. If the actual distance goes below the minimum distance, an emergency stop can be triggered. If the actual distance goes below the critical distance, the safety gear of the car can be triggered.

Abstract: In an elevator apparatus, a car ascends and descends based on a running speed pattern generated by a control panel. Destination floor buttons and landing buttons are connected to an over speed monitoring portion without the intervention of the control panel. The over speed monitoring portion has an over speed setting portion for setting first and second over speeds based on car position information obtained from a car position detector and call registration information obtained from the destination floor buttons and the landing buttons. In the over speed setting portion, a running speed pattern different from the running speed pattern generated by the control panel is independently generated without depending on information from the control panel. The first and second over speeds are set based on the running speed pattern generated by the over speed setting portion.

Abstract: The invention concerns a device, a method and a system for improving the safety system of an elevator. The safety system of the invention comprises an electric safety device, which monitors the velocity and position of the elevator in the elevator shaft. The safety device is e.g. a computer that is able to stop the elevator, using the brake of the hoisting machine or an optional car brake. The basic idea of the safety system of the invention is to form a continuous limit curve for control of elevator speed. The limit curve defines the limits of allowed elevator motion, which are determined on the basis of the nominal speed of the elevator and the location of the car.

Abstract: An elevator apparatus has a criterion (overspeed levels) that changes in accordance with an operational condition of a car. The elevator apparatus also has a position information correcting means that corrects an error in value that determines the criterion. In the elevator apparatus, the overspeed levels are determined using continuous information corresponding to car position, while the continuous information is corrected using intermittent information corresponding to actual car position. According to the elevator apparatus, on-the-spot adjustment or long-time maintenance becomes unnecessary, and overspeed detection levels can easily be changed in accordance with the operation conditions of the car.

Abstract: A method for preventing an inadmissibly high speed of a load receiving unit of an elevator, including the steps of supplying information about an actual position and an actual speed of the load receiving unit in an area of an entire travel way of the load receiving unit to a speed monitoring device by at least one measuring system, continuously comparing the actual speed with a speed limit value by the speed monitoring device, and activating braking measures if the speed of the load receiving unit exceeds a speed limit value. At least three different braking measures are successively triggered by the speed monitoring device.

Abstract: A safety system for an elevator car which will prevent movement of the elevator car should the car drift beyond a predetermined distance from the hoistway sill with the car door in an open position.

Abstract: A safety device for monitoring a movable element, in particular, for elevators, is provided. The safety device includes a speed determination unit for determining the speed of the movable element, a comparator device for comparing a predetermined speed with the determined, actual value, a triggering unit for triggering a braking device, and a distance determination unit for determining the distance of the movable element in relation to a stationary or movable target. The comparator device comprises a memory for storing a maximum admissible speed and at least one nominal distance with an associated nominal speed. The comparator device compares a greatest stored nominal distance with an actual distance indicated by the distance determination unit. When the nominal distance is the same as the actual distance, the comparator device compares the nominal speed associated with the nominal distance with the actual speed registered by the speed determination unit at this point of time.

Abstract: A centrifugally activated device for controlling the speed of movement of an elevator cab includes the capability of controlling upward and downward movement. A first stopping device is associated with at least one elevator sheave. A second stopping device preferably is supported on an opposite side of the same sheave. The second stopping device preferably includes centrifugally activated components such as a latch member that moves from a first position into a second, stopping position responsive to an undesirably high speed of upward movement of the elevator cab. The centrifugally activated components preferably include a latch member that is rotatably supported on the sheave and has an engaging member at one end that engages a cooperating stop surface near the sheave to prevent the sheave from further rotation upon the sheave reaching an undesirably high rate of rotation.

Abstract: In a speed governor linkage mechanism that is displaced by centrifugal force acting on rotary weights, a balancing weight is provided in addition to speed adjustment spring for generating balancing force in opposition to the centrifugal force. When the speed of the cage is less than a prescribed speed, restraint of movement of the speed governor linkage mechanism is performed solely by the balancing force produced by balancing weight but when the speed of the cage exceeds said prescribed speed, restraint of movement of the speed governor linkage mechanism is performed by both the balancing force produced by the balancing weight and the balancing force produced by the speed adjustment spring.

Abstract: A centrifugally activated device for controlling the speed of movement of an elevator cab includes the capability of controlling upward and downward movement. A first stopping device is associated with at least one elevator sheave. A second stopping device preferably is supported on an opposite side of the same sheave. The second stopping device preferably includes centrifugally activated components such as a latch member that moves from a first position into a second, stopping position responsive to an undesirably high speed of upward movement of the elevator cab. The centrifugally activated components preferably include a latch member that is rotatably supported on the sheave and has an engaging member at one end that engages a cooperating stop surface near the sheave to prevent the sheave from further rotation upon the sheave reaching an undesirably high rate of rotation.

Abstract: In relation with this mechanism for stopping an elevator car is, for the monitoring of the speed of the elevator car, an overspeed governor provided which works based on the swing lever principle, whereby the movement of the elevator car will be transferred by means of a governor rope to the overspeed governor. The governor rope extends itself over the entire shaft height and will be returned at the lower shaft end by means of a deflection sheave and stretched by means of counterweight as well as guided at the upper shaft end over a pulley of the overspeed governor. The ends of the governor rope are fastened on a release mechanics arranged on the elevator car and such release mechanics operates in an emergency a safety gear arranged on the elevator car. With the overspeed of the elevator car a rope brake is released upwards.