| 摘要 |
A retrieval and collection device is adapted for removable coupling in-line to a conventional portable vacuum cleaning system, at an upstream end of a vacuum hose. The retrieval device includes a casing with a relatively large diameter medial region and respective upstream and downstream coupling sleeves at opposite ends of the casing. The casing consists of two casing sections joined along the casing medial region for periodic disassembly to remove captured articles. The size of articles to be captured is determined by a flat, disc-like screen removably mounted in a chamber defined by the casing medial region. Multiple apertures through the screen are substantially uniform in size to capture objects of at least a given dimension. Separate screens with apertures of different sizes can be interchangeably mounted in the chamber. Each screen is part of a partition device that further includes a collar surrounding the screen and a handle projected axially from the center of the screen. Each collar has an outside diameter slightly less than the inside diameter of the chamber and an axial dimension sufficient to stabilize the screen orientation while allowing axial movement of the screen relative to the casing. If desired, two or more partition devices can be arranged in tandem, whereby retrieved articles are sorted by size.
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