| 摘要 |
Work string-mounted cleaning tool and a method of assembling such tools using a quick release for the cleaning element e.g. brushes or scrapers is described. Oblong pad element(23) has a curved upper surface (21) with slots (22) to receive by insertion work surface segments, e.g. carrying bristles to assemble a brush type cleaning element, has an edge (24) providing tongue (25) for insertion into groove (16) in end wall (17)in the body (1).Opposite edge (27) has a part-circular recess (26) with part- circular peripheral lip (28) around an upper edge of the recess.A retainer fastening component (29) adapted to be positioned in the recess has a core (30) with socket (31) adapted to receive a driving tool. The core has a flange (32) extending part way around it with concave curved surfaces (33) and (34) spaced apart,and at a terminal position, an abutment surface (36).The retainer is sized to permit it to rotate when mounted within the recess,where by when turned by a driving tool at least part of the flange projects out of the recess to fit with a groove (19) in end wall (18) of the body. Roll pins (20) and (40) are provided for use in locating the fastener component in predetermined rotational configurations in relation to the recess. Shear pin (37) is provided to inhibit unintended rotation of the fastener component from a predetermined position set by the roll pins, and to lock the retainer for normal use of the cleaning tool. Removal of the roll pins and forced rotation of the retainer causes shearing of the shear pinto permit disassembly of the tool.
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