| 摘要 |
PROBLEM TO BE SOLVED: To provide a chain block capable of enhancing durability of a pinion gear to provide a long service life and enhance reliability.SOLUTION: A chain block comprises: a load sheave; a load sheave hollow shaft having a hollow hole penetrating it in an axis direction; a driving axis inserted into the hollow hole and rotated by driving of a hand chain; a deceleration mechanism transmitting rotation of the driving axis to the load sheave hollow shaft and having plural gears. The deceleration mechanism has a first gear 72 and second gear 61 meshing each other. The first gear 72 has smaller number of tooth than the second gear 61. A thickness of a tip side of tooth extended away from bottom 723 of the first gear 72 is greater than a thickness of a tip side of tooth extended away from bottom 613 of the second gear 61. |
