| 摘要 |
A compact and simple elevator system is provided which requires no counterweight and no machine room, and which is most suitable for installation in small buildings such as private homes. The elevator system comprises: a hoistway; an elevator car accommodated in the hoistway and movable in the vertical direction; a screw shaft vertically disposed in the hoistway and having a screw thread formed on the outer peripheral surface thereof; a rotary element mounted on the elevator car and adapted to be threadedly engaged with the screw shaft; a drive source mounted on the elevator car for driving the rotary element to rotate; and a mechanism for restraining the rotation of the screw shaft at least in the normal operating condition of the elevator system, whereby when the rotary element is driven to rotate by means of the drive source, it is caused to displace vertically along the screw shaft thereby to move the elevator car in the vertical direction. An emergency operation device may be provided which is adapted to be connected with the screw shaft in an emergency situation for turning the screw shaft so that the rotary element threadedly engaged with the screw shaft is caused to displace vertically along the screw shaft thereby to move the rotary element and hence the elevator car in the vertical direction.
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