| 摘要 |
The motorized chalk box includes a chalk line reel having an internal ring gear. An electric motor drives a pinion gear, which engages the ring gear, thus resulting in a very compact assembly. The motor and gearing are sealed from the chalk dust reservoir, through which the chalk line passes. The housing comprises two components secured by a single screw to facilitate minor maintenance. A spring loaded, automatically releasing line clip extends from the distal end of the chalk line. The line clip includes a spring-loaded sleeve, which is biased against the anchor (screw, nail, etc.) when in place. Releasing the tension on the chalk line causes the sleeve to spring against the anchor, thus kicking the line clip away from the anchor. The chalk box may thus be operated using only one hand, greatly improving safety for workers in elevated environments.
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