| 摘要 |
<p>A device for lowering/carrying from an elevated place, comprising a lowering device, a braking device and a driving/carrying device. The lowering device comprises horizontally disposed sprockets, a suspension chain passed around the sprockets, and a carrier suspending means attached to the suspension chain; the braking device comprises a fluid pump for converting the rotational motion of a crank shaft into the reciprocating motion of a piston to suck fluid from a suction path for jetting from a jetting path, a fluid circulating path for circulating the fluid jetted from the jetting path of the fluid pump to the suction path of the pump, a jet amount regulating valve for regulating an amount of liquid passing the jetting path of the pump to produce the fluid compressive resistance of the piston, and a rotation governor for detecting variations in the rotating speed of the sprocket to control the jet amount regulating valve; and the driving/carrying device comprises a transmission means for transmitting the rotation of the sprocket in the lowering device to the crank shaft of the braking device, and is so constituted as to allow the rotation governor to control the jet amount regulating valve in accordance with the rotating speed of the sprocket rotated by the weight of the carrier when the carrier suspends from the suspension chain to change the fluid pressure resistance of the piston and thereby apply a braking force to the rotation of the sprocket in the lowering device.</p> |
