| 摘要 |
In a spring retracted tape measure in which the tape measure is retracted into a housing (1,2) onto a spring biassed drum (3), the ratchet is constituted by teeth (23) formed on the housing and detents (27) on flexible arms (24) on the drum which bias the detents into contact with the teeth (23). A portion (20) of the housing is resiliently connected to the rest of the housing, and can be depressed inwardly to engage the flexible arms (24) thus disengaging the detents (27) from the teeth (23) to permit the tape to be wound in.
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