| 摘要 |
<p>A self powered, self hoisting elevator apparatus for lifting objects from a lower supporting surface to or nearer to an origin at a predetermined height in a multistory structure comprises a light weight housing of sufficient strength for receiving and supporting the objects to be lifted. A cable is wound at least partially onto a rotatable member supported by the housing, the cable having a predetermined length sufficient to reach at least from the origin to the lower supporting surface and having a free end for securing the cable to a fixed anchorage proximate to the origin, the rotatable member rotating in a first direction when the housing is descending toward the lower supporting surface. A descent-slowing, energy dissipating mechanism is supported by the housing and driven by rotation of the rotatable member in the first direction, the descent-slowing, energy dissipating mechanism dissipating energy when the housing is descending toward the lower supporting surface to maintain the rate of descent of the housing to be within a predetermined range. A motor is supported by the housing and operatively engaged with the rotatable member for rotating the rotatable member in a second direction, opposite to the first direction, for lifting the housing toward the origin. A power source is also supported by the housing for providing power to the motor. The housing may descend under at least its own unloaded weight toward the lower supporting surface at a descent rate within the predetermined range and when at the lower supporting surface, the housing may be loaded with the objects to be lifted and thereafter the motor may be activated causing the motor to turn the rotatable member to thereby lift the housing toward the origin.</p> |
