This standard outlines the criteria for wooden handles used in shovels compliant with IS 274 (Parts I & II). It details the selection of timber, dimensional limits, craftsmanship, and performance evaluations such as impact and flexural tests to ensure reliability and safety. It is vital for manufacturers, inspectors, and engineers involved in designing, producing, or approving wooden shovel handles in India.
Overview
This standard outlines the criteria for wooden handles used in shovels compliant with IS 274 (Parts I & II). It details the selection of timber, dimensional limits, craftsmanship, and performance evaluations such as impact and flexural tests to ensure reliability and safety. It is vital for manufacturers, inspectors, and engineers involved in designing, producing, or approving wooden shovel handles in India.
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Contents
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Frequently Asked
IS 2897 (1983) mandates that shovel handles be constructed from timbers classified under Class IV handles according to IS 620-1975. Typically, this includes robust hardwoods such as Ash, Hickory, Beech, Teak, or other indigenous hardwoods noted for their shock resistance and strength. The handles must successfully pass bending tests specified in IS 274 (Part I) to verify their structural integrity. Moisture content and dimensional accuracy should comply with IS 620-1975 provisions, ensuring durability and safety.
According to Clause 3.2 of IS 2897, wooden blanks must have a moisture content ranging between 8% and 15%. The timber should be properly seasoned, preferably through air seasoning, and be free from defects such as pith, decay, checks, shakes, splits (excluding hairline splits), borer holes, and warping. Post-manufacture, handles should be immersed in raw linseed oil for a minimum of five minutes to stabilize moisture levels, thereby enhancing durability and reducing the risk of deformation.
IS 2897 aligns dimensional tolerances with those outlined in IS 620-1975. The permitted length deviation for wooden shovel handles is ±5 mm. Thickness and other dimensional details should conform to the drawings provided in the standard (Fig. 1 and Fig. 2), including a minimum thickness of 2 mm for mild steel sheet components and 5 mm diameter for riveted mild steel pins. Handles must also pass the bending test specified in IS 274 (Part 1, Clause 14.2) without showing cracks or distortion.
The drop test, as described in Clause 6.1 of IS 2897, involves supporting the handle freely over a span of 460 mm. A weight of 4.5 kg is dropped vertically at the midpoint of the handle from a height of 900 mm. The handle must demonstrate no cracks or visible damage after the impact. This test assesses the handle’s ability to withstand sudden shocks and ensures its suitability for practical use without failure.
IS 2897 recommends that immediately after fabrication, wooden handles be dipped in raw linseed oil at ambient temperature for at least 5 minutes. This treatment helps retard moisture fluctuations, minimizing risks of warping, cracking, and weakening of the handle over time. Prior to oil application, the wood must be well-seasoned with moisture content maintained between 8% and 15%. Linseed oil acts as a protective barrier, preserving the wood’s structural integrity under varying environmental conditions.
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