| 摘要 |
The support bar (11) has fixing heads (14) projecting from its upper surface. Each head has a fish-hook type barb (17). These are introduced into holes (6) formed in the underside of the tool plate (10), and becomes embedded in the underside of the tool plate, thus retaining it in position. The support bar (11) has upper (19) and lower (20) surfaces, with a number of fixing heads (14) projecting from its upper surface. Each head includes a straight sided section (15) with a conical section (16) above. The conical section is narrower at the top and wider at the bottom, such that it is wider than the straight section, thus forming fish-hook type barbs (17). These are introduced into holes (6) formed in the underside of the tool plate (10), the holes having been formed by laser machining. The barbed support heads become embedded in the underside of the tool plate, thus retaining it in position. The tool plate may be made of wood, enabling rapid and accurate laser machining of the holes.
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