| 摘要 |
Three tubular bodies (2-4) having different lengths and diameters are inserted and connected to each other by pins so that they project over the edges (7) of the next larger tubular body. The pins are inserted by press-fitting through the holes of the tubular bodies and are secured by their hooks. The length of the multi-walled placeholder (1) is adjusted by pushing the tubular bodies along the longitudinal axis when the pins are removed. The tubular bodies have uniformly arranged hexagonal openings at their jacket surface that define a honeycomb structure. An independent claim is included for the method of producing a multi-walled placeholder. |
