| 摘要 |
A device to enable a person to descend from an elevated position at a controlled and variable speed comprises a known restraining member 12 having a series of slots 13 through which a tape 11 passes and an apertured retarding device 50 on the tape 11 to retard the passage of the tape through the restraining member 12 thus controlling the rate of descent. The retarding device 50 may include an aperture (54 fig 4 or 58 fig 6A) narrower than the tape 11. The tape 11 may be stored in a container or bag 20 and terminate in a hook 10 for attachment of the device to a fixed point. In use the retarding device 50 may be retained in the container 20 at a restricted opening (40 fig 3a) or retained against the lower end of the restraining member 12. A user wearing a harness 21 removably attached to the restraining member 12 may descend at a controlled rate determined by the frictional engagement of the tape 11 with the surfaces of the restraining member 12 and the retarding device 50. |
