| 摘要 |
<p>A tool pot (20, 20A, 30, 30A, 40) according to the present invention includes a synthetic resin portion (21, 31, 41) made from thermo-plastic resin and arranged over an entire length from an opening end (21a, 31a, 41a) to a tool gripping portion (29). Inner surface of the synthetic resin portion (21, 31, 41) is a tool attachment hole (22, 32, 42). The synthetic resin portion (21, 31, 41) is provided in the vicinity of the opening end (21a, 31a, 41a) of the attachment hole (22, 32, 42) with a supporting surface (24a, 36a, 44a) for supporting a tool (T). The synthetic resin portion (21, 31, 41) includes an outer structure (23, 33, 43) defining outer shape, an inner structure (24, 36, 44) defining inner circumference of the tool attachment hole (22, 32, 42), a cavity (27, 37, 47) provided between the outer structure (23, 33, 43) and the inner structure (24, 36, 44), and joint ribs (25, 34, 45) joining the outer structure (23, 33, 43) and the inner structure (24, 36, 44). Each of the outer structure (23, 33, 43), the inner structure (24, 36, 44) and the joint ribs (25, 34, 45) has wall-thickness enough to secure rigidity of the synthetic resin portion (21, 31, 41) and capable of suppressing mold shrinkage of the synthetic resin portion (21, 31, 41). The tool pot (20, 20A, 30, 30A, 40) according to the present invention has rigidity without damaging tools (T) by the synthetic resin portion (21, 31, 41), and has high dimensional accuracy and design freedom. <IMAGE></p> |
