Is this standard still active?

No, IS 7197:1974 has been declared 'Superseded' by BIS and is no longer in force.

What kind of spring mechanism does this standard cover?

It covers double-action mechanical floor springs that operate without hydraulic oil for damping ('without oil check').

What is the required number of cycles for the endurance test?

The spring mechanism must withstand 100,000 continuous opening and closing cycles without any failure as per Clause 7.2.

How are the different sizes of floor springs classified?

They are classified into three sizes (Size 1, 2, and 3) based on the maximum weight of the door they can support, as detailed in Table 1.

IS 7197

: 1974

Specification for double action floor springs (without oil check) heavy door

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This standard specifies the requirements for materials, dimensions, manufacture, and performance of double-action floor springs without oil check (non-hydraulic), designed for heavy doors. It provides three standard sizes based on door weight and outlines testing procedures, including an endurance test, to ensure durability and proper function.

Specification for double action floor springs (without oil check) heavy door

Quick Reference Values

Maximum door weight (Size 3)125 kg

Endurance test cycles100,000 cycles

Body material specificationGrey cast iron, Grade FG 150 conforming to IS 210

Spring material specificationSpring steel, Grade 3 conforming to IS 4454 (Part 1)

Top plate materialBrass or stainless steel

Practical Notes

This standard has been marked as 'Superseded' by BIS, meaning it is outdated and no longer maintained. It is recommended to use modern alternatives.

This code covers non-hydraulic springs. For modern hydraulic floor springs, refer to IS 6315.

Proper selection of the spring size according to the door's actual weight is critical to prevent failure and ensure safe operation.