| 摘要 |
A replacement cartridge for a coilable rule wherein a form-sustaining spool mounts a coiled measuring blade and a recoil spring. The hub of the rule is separable from the spool and the recoil spring is attached thereto. The hub has an integral keeper which overlies the coiled measuring tape and is engaged by the hook at the end of the blade for maintaining the integrity of the replacement cartridge until it is inserted in the casing for the tape. |
