摘要:
A rotary actuated overspeed safety device is provided for elevators. The overspeed safety device comprises a pair of pivotally mounted counterweights linked by a pivotally attached coupling rod and a wheel that rollably engages a guide rail. The counterweights are pivotally mounted to the wheel in a parallel plane configuration. Centrifugal force causes the pivotally mounted counterweights to pivot outward toward an actuator as the wheel spins. The overspeed safety device is triggered when the pair of pivotally mounted counterweights engages an actuator. The actuator is a housing that is engagably connected to an elevator safety.
摘要:
In an elevator safety braking device, a variable traction mechanism in a rotary actuator allows the drive wheels of the rotary actuator to operate at a reduced preload during normal elevator operation. When engaging, a higher preload is necessary. In the event of safety braking, the variable traction mechanism increases the preload on the drive wheel to ensure timely and proper safety engagement. The variable traction mechanism therefore allows the drive wheels to be subjected to a reduced preload during normal operation, thus relaxing the design criteria for the drive wheels while maintaining reliability.
摘要:
An elevator system 40 includes an over-acceleration and over-speed protection system capable of triggering a machine room brake and a safety trigger when over-speed or over-acceleration conditions are detected. The system includes a speed detector 42 and an acceleration detector 44. Based upon sensed speed and sensed acceleration, the controller 48 calculates a filtered speed of an elevator mass such as an elevator car 16 or counterweight, and compares the filtered speed to the threshold speed to determine whether an over-speed condition has been reached. The controller 48 activates a machine room brake when an over-speed condition exists, and engages an elevator safety 70A, 70B when it determines that the elevator mass is still in an over-speed condition after the machine room brake has been activated.
摘要:
An elevator system includes one or more rails fixed in a hoistway and an elevator car configured to move through the hoistway along the one or more rails. The system includes one or more braking systems having one more braking surfaces secured to the elevator car and frictionally engageable with one or more rails of the elevator system. One or more actuators are operably connected to the one or more braking surfaces configured to urge engagement and/or disengagement of the one or more braking surfaces with the rail to stop and/or hold the elevator car during operation of the elevator system.
摘要:
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.
摘要:
A two door assembly (10) for an elevator car (11) includes a high speed door (12) and a low speed door (14) that move between an open and closed position to close the entrance (16) of the elevator car. The doors (12, 14) are retained slidably between a header (18) disposed along the top of the car entrance and a door guide (20) disposed along the bottom of the car entrance (16). A drive mechanism (22) moves the high speed and low speed doors (12, 14) between the open and closed positions. A drive arm (24) interconnects the doors to move the low speed door (14) at approximately one-half the speed of the high speed door (12) driven by the drive mechanism (22). One end (38) of the drive arm (24) is connected pivotally to the door guide (20) of the elevator car (11). Each door (12, 14) has a pin (32, 34) extending from a bracket (26, 28) connected to each respective door for sliding engagement with a pair of slots (42, 44) that extend longitudinally along the drive arm (24). The length of the slots (42,44) are sufficient to permit movement of the doors (12, 14) between the open and closed positions. The weight of the drive arm (24) at a predetermined center of gravity (50) provides a predetermined closing force (F.sub.HC) to the high speed door (12) in the closed position and a reduced closing force (F.sub.HO) to the high speed door in the open position.
摘要:
An elevator system 40 includes an over-acceleration and over-speed protection system capable of triggering a machine room brake and a safety trigger when over-speed or over-acceleration conditions are detected. The system includes a speed detector 42 and an acceleration detector 44. Based upon sensed speed and sensed acceleration, the controller 48 calculates a filtered speed of an elevator mass such as an elevator car 16 or counterweight, and compares the filtered speed to the threshold speed to determine whether an over-speed condition has been reached. The controller 48 activates a machine room brake when an over-speed condition exists, and engages an elevator safety 70A, 70B when it determines that the elevator mass is still in an over-speed condition after the machine room brake has been activated.
摘要:
An electromagnetic safety trigger 46 includes a link 72 kinematically connected to a safety 70A, 70B of an elevator system mass, such as an elevator car or counterweight. An electromagnet 76 mounted on a linear actuator 74 is magnetically coupled to the link 72, and a spring 78 is connected between the link 72 and the elevator mass. The electromagnet 76 can be triggered to release the link 72, which allows the spring 78 to move the link 72 to engage the safety 70A, 70B.
摘要:
An elevator system includes one or more rails fixed in a hoistway and an elevator car configured to move through the hoistway along the one or more rails. The system includes one or more braking systems having one more braking surfaces secured to the elevator car and frictionally engageable with one or more rails of the elevator system. One or more actuators are operably connected to the one or more braking surfaces configured to urge engagement and/or disengagement of the one or more braking surfaces with the rail to stop and/or hold the elevator car during operation of the elevator system.
摘要:
An exemplary elevator braking device comprises a brake housing. A plurality of rollers are supported by the brake housing. The rollers are arranged to be positioned on opposite sides of a guiderail. The rollers are selectively moveable between a first position in which the rollers are spaced apart a first distance and a second position in which the rollers are spaced apart a second, smaller distance so that the rollers engage and roll along opposite sides of the guiderail. At least one biasing member is supported by the brake housing. The biasing member is associated with at least one of the rollers and biases the associated roller toward the other roller in the second position. A plurality of braking surfaces are supported by the brake housing. At least one braking surface is associated with each of the rollers. Each braking surface engages a periphery of the associated roller that faces the side of the guiderail. Friction between the periphery of the associated roller and the braking surface provides a stopping force.