| 摘要 |
A device for capturing and removing substantially all debris that falls into a manhole includes a flexible, substantially circular folded disk that is inserted into the manhole prior to performance of the debris-creating work, and is unfolded by an unfolding mechanism until the rim of the disk rests against the manhole bounding wall. Semi-rigid rods are secured to eyelets adjacent to the perimeter of the disk and terminate above the disk at a common junction, to which a removal and insertion mechanism can be attached. The device may be left inside of the manhole, separated from the insertion and removal mechanism, during performance of the debris creating work, and then folded and removed after the work is completed, thereby trapping and removing the debris. In embodiments, the unfolding mechanism includes supports radiating outward from the center of the disk and attached to the disk along their entire lengths. |
| 主权项 |
1. A debris removal device for capturing and removing falling debris, the device comprising:
a flexible disk; a plurality of eyelets adjacent to the perimeter of the flexible disk; an unfolding mechanism, configured when the weight of the device is supported by a surface to unfold the flexible disk until the flexible disk is flat, or until the perimeter of the flexible disk is resting against a surrounding wall; a plurality of substantially rigid rods having distal ends and proximal ends, the substantially rigid rods being equal in number with the eyelets, ii and being configured so that a distal end of a rod is pivotally secured to each eyelet; a common junction above the flexible disk, at which the proximal ends of the rods pivotally terminate; and an attachment mechanism fixed to the common junction, the attachment mechanism being configured for attachment thereto of a hoisting mechanism. |
