| 摘要 |
The pedagogical aid (1) has several rod-shaped elements (2) which are hinged (3) together. The rod-shaped elements includes adjusters (4) and locking fastener (4a-b, 5). For each pair of element there is one hinge, allowing relative movement and an angle of 90 degrees, 180 degrees, 270 degrees or 360 degrees between two bars. The elements are removably flexible bars. The adjuster comprises a groove (4a) and spring (4b) collar formed adjacent to the hinge. The hinges have friction on their bearing-surface area.
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