Reaffirmed 2021

1. Scope

1.1 This standard covers the dimensions, material, tests and general requirements for various types of couplings and drawbars used in mines for connecting mine tubs in a set of tubs and having a minimum safe working load of 50 kN. Table given at Annex B may be referred as a reference for safe working load of couplings made of different materials.

1.2 This shall be applicable to all the types of Mine Tub Couplings and Draw Bars, as annexed to this standard and mentioned as Types A, B, C, D, E and F.

2. REFERENCES

The following standards contain provisions, which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

2102 (Part 1) : 1993 General tolerances: Part 1 Tolerances for linear and angular dimensions without individual tolerance indicators (third revision)

4432 : 1988 Case hardening steels (first revision)

5517 : 1993 Steels for hardening and tempering-Specification (second revision)

5616 : 1982 Short link chain for lifting purposes general conditions of acceptance (first revision)

1929 : 1982 Specification for hot forged steel rivets for hot closing Specification for general requirements for welding