【国外标准】 Lever Hoists: Safety Standard for Cableways, Cranes, Derricks, Hoists, Hooks, Jacks, and Slings

B30.21 applies to the construction, installation, operation, inspection, and maintenance of ratchet and pawl and friction brake type lever chain, rope and web strap hoists used for lifting, pulling, and tensioning applications. The requirements for a lever hoist that is used for a special purpose, such as lifting personnel, or drawing both the load and the hoist up or down the load chain, rope or web strap when the lever hoist is attached to the load, and a specially insulated hoist used for handling energized electrical power lines are not included in this volume.