| 摘要 |
Each link comprises a frame and an insert detachably mounted in said frame. Each frame comprises first and second hinge portions at opposite ends thereof. The second hinge portions are formed with pockets. Each insert is formed adjacent to the second hinge portion of the frame of the same link with end noses received by the pockets of the frame of the same link. Each insert is formed adjacent to the first hinge portion of the frame of the same link with extensions. Hinge pins are provided, each of which extends through the extensions of the insert of one of said links and in said first hinge portion of the frame of the same link and in said second hinge portion of the frame of an adjacent link.
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