| 摘要 |
Tape rule brake mechanism consists of a brake device and a positioning member. The rim of the reel on which a measuring tape being coiled around is provided with at least one trammeling block accompanied with a confinement slot. When the brake machanism is actuated, a detent formed at the tip of the brake device drops into the confinement slot and halt the reel rotation by mating with the trammeling block of the reel so as to indirectly stop motion of the tape coiled on the reel. The tape is stably fixed at the position without slipping away by secure engagement of the positioning member with the detent of the brake device. The reset action of the brake device is assisted by the restoring force of a compressed spring.
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