| 摘要 |
A variable cross-section cable-reeling sheave, comprising a sheave body (6.1) and a mounting hole (6.2). Variable cross-section cable grooves (6.1A and 6.1B) are provided on the cable-reeling sheave. When a cable (3) is wound on different parts of the grooves (6.1A and 6.1B) of the cable-reeling sheave, the frictions between the cable (3) and the grooves (6.1A and 6.1B) of the cable sheave are also different. At the same time, also provided is a hanger that employs the variable cross-section cable-reeling sheave. A U-shaped cable-passing piece (2) is arranged on a hanging body (1) of the hanger. The U-shaped opening of the U-shaped cable-passing piece (2) and the hanging body (1) constitute a cable-passing hole (1.1). The hanging body (1) has arranged thereon the variable cross-section cable-reeling sheave, has arranged at a position offset towards one side a hanging hole (1.2) that supports the weight of a human body, and has arranged at the other side opposite the hanging hole (1.2) an operating handle (1.4) for controlling the deviation of the hanger. When in use, a work cable (3) runs through the cable-passing hole and winds onto the variable cross-section cable-reeling sheave, a work cable fixed end (3.1) is fixed at a high position, a work cable free end (3.2) is dangled at a low position, and the human body (5) is connectively fixed to the hanging hole (1.2). When the human body (5) is supportively hanged solely by the hanging hole (1.2), because the work cable fixed end (3.1) and the work cable free end (3.2) are pressed tight against each other, the hanger is in a self-locked state; when the human body (5) exerts a pulling force on the hanger via the operating handle (1.4), the hanger deflects to reduce the pressure between the work cable fixed end (3.1) and the work cable free end (3.2) to allow the human body (5) to descend. The rotation of the variable cross-section cable-reeling sheave is controlled by a human hand (5.1), the friction between the cable-reeling sheave and the cable (3) can be adjusted to control the speed of descent. |
