| 摘要 |
A chain block (10) is provided including a load chain (C1) which hangs a load, and a load sheave member (20) which is rotatably supported between a first frame (11) and a second frame (12), around which the load chain (C1) is wound, and which has a chain pocket (23b) in which the load chain (C1) goes, the load chain (C1) is made of a steel material having the Rockwell hardness C scale (HRC) of 47 to 51, and the load sheave member (20) is made of a steel material in which at least the chain pocket (23b) has the Rockwell hardness C scale (HRC) of 40 to 45. |
