SAFETY DEVICE FOR ELEVATORS

摘要

The present invention provides a safety device for elevators, which belongs to the field of elevator safety technologies. The safety device for elevators includes a housing; a safety piece having a guide rail groove, the safety piece being disposed in the housing; and asymmetric active and counter wedges that are slidably disposed on the safety piece at both sides of the guide rail groove, respectively. Moreover, the device further includes a U-shaped elastic element and a blocking piece that are disposed on the safety piece. The safety device for elevators can provide a relatively stable arresting force, is reliable in repetitive work, achieves high safety, is relatively easy as well as fast and efficient in restoration, and is especially suitable for high-speed elevators.

主权项

1. A safety device (10) for elevators, comprising: a housing (110); a safety piece (120) having a guide rail groove (121), the safety piece (120) being disposed in the housing (110); asymmetric active and counter wedges (130, 140) that are slidably disposed on the safety piece (120) at both sides of the guide rail groove (121), respectively; and
the safety device (10) for elevators further comprising a U-shaped elastic element (150) and a blocking piece (160) that are disposed on the safety piece (120); wherein a guide groove (122) is provided in the safety piece (120), the blocking piece (160) is capable of moving approximately upward along the guide groove (122) during at least part of a braking process, and the guide groove (122) and the blocking piece (160) are configured to be capable of stopping, during at least a restoration process, a pre-tightening force generated by the U-shaped elastic element (150) from being transferred to the counter wedge (140); and a lower U-shaped end (150a) of the U-shaped elastic element (150) fixedly acts on a lower end surface (129) of the safety piece (120), and an upper U-shaped end (150b) of the U-shaped elastic element (150) elastically acts on an upper end surface (161) of the blocking piece (160), and transfers, through the blocking piece (160) during the at least part of the braking process, at least part of an elastic force of the U-shaped elastic element (150) to the counter wedge (140) that interacts with a lower end surface (162) of the blocking piece (160).