| 摘要 |
An emergency descent device includes a casing, a rotation retarding device, a suspension gear pulley, a cable extending around the suspension gear pulley and a cable guiding unit. The cable guiding unit includes a pair of spaced upper rollers and a lower roller provided under a point between the two spaced rollers. A cable has a descending portion and an ascending portion, which is frictionally passed around the suspension gear pulley. Each of the two end portions of a cable pass between one of the pair of spaced rollers and the lower roller. When one end of the cable is pulled, an additional frictional force occurs which arrests the fall of the pulled end of the cable.
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