The scales applicable to lever hoists typically refer to the ratings and capacities that are used to describe their lifting abilities. Here are some key scales and ratings to consider:

1. Load Capacity

Rated Load: This is the maximum load that the lever hoist is designed and tested to lift safely. It is usually expressed in tons or kilograms.

Safe Working Load (SWL): Also known as the maximum working load, this is the maximum load that can be lifted without exceeding the design limits of the hoist.

2. Lifting Height

Maximum Lifting Height: This is the maximum distance that the load can be lifted from the ground or starting position.

Standard Lift: This refers to the standard or default lifting height for the hoist.

3. Chain or Rope Specifications

Chain Diameter: For chain hoists, the diameter of the chain is an important specification that affects the strength and durability of the hoist.

Chain Length: The length of the chain determines the maximum reach of the hoist.

Rope or Web Strap Specifications: For rope or web strap hoists, the material, diameter, and strength of the rope or strap are critical factors.

4. Classification and Standards

ASME B30.21: This is a standard set by the American Society of Mechanical Engineers that outlines the design, inspection, and maintenance requirements for lever hoists. It includes classifications for different types of hoists, such as chain, rope, and web strap hoists.

Other Standards: Lever hoists may also comply with other standards, such as ANSI/ASME HST-3M or international standards like BS EN13157.

5. Testing and Certification

Proof Load Testing: This is a test conducted to verify the load-carrying capacity of the hoist. It typically involves lifting a load that is a certain percentage (usually 125% or 150%) of the rated load for a specified period.

Certification: Lever hoists may be certified by third-party agencies to confirm that they comply with applicable standards and regulations.

6. Additional Ratings and Specifications

Effort Required to Lift Rated Load: This is the force that must be applied to the lever to lift the rated load.

Number of Falls: This refers to the number of chains or ropes that are attached to the load hook. More falls can provide a greater mechanical advantage and allow for heavier loads to be lifted.

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