The 1993 edition of IS 2892 outlines the criteria for wooden handles intended for use with picks and beaters as defined in IS 273:1983. It covers aspects such as timber selection, dimensional specifications, permissible variations, craftsmanship, finishing processes, and identification markings to guarantee reliability and user safety. This specification is vital for producers, quality control personnel, and engineers who design or approve wooden handles for manual digging and impact tools.
Overview
The 1993 edition of IS 2892 outlines the criteria for wooden handles intended for use with picks and beaters as defined in IS 273:1983. It covers aspects such as timber selection, dimensional specifications, permissible variations, craftsmanship, finishing processes, and identification markings to guarantee reliability and user safety. This specification is vital for producers, quality control personnel, and engineers who design or approve wooden handles for manual digging and impact tools.
Audience
Contents
Structure
IS 2892 defines the dimensions, tolerances, and marking requirements for wooden handles used with picks and beaters. Critical tolerances include a +3 mm/-0 mm allowance where the handle connects to the tool head, ±2 mm at other locations, and ±5 mm for overall length. Handle shapes and sizes must adhere to the detailed drawings provided in Figures 1 and 2. The helve taper should be maintained at 1 in 10 with a ±1.5 mm tolerance on all helve dimensions. Rounding of final test values follows IS 2:1960 standards, preserving significant figures.
The standard refers to IS 2:1960 for rounding rules, IS 620:1985 for timber and wooden handle requirements, and IS 273:1983 for picks and beaters specifications. Dimensional tolerances and marking requirements are strictly enforced to ensure interchangeability and quality. The use of the BIS Standard Mark is regulated under the BIS Act 1986, ensuring authorized application.
Definitions related to timber and tool handles are adopted from IS 620:1985. Rounding of measured or calculated values must comply with IS 2:1960. Tolerances for fitting areas, other locations, and lengths are specified to guarantee correct assembly and function.
Wooden blanks used for handles must be well-seasoned, preferably air-seasoned, with moisture content between 8% and 15%. The timber must be free from core pith, decay, checks, shakes, and splits (excluding minor hairline splits), as well as borer holes or warping. Approved species align with IS 620:1985, including Ash, Hickory, Sal, Teak, and others known for toughness and durability.
Handles must be crafted from seasoned, defect-free wooden blanks shaped according to dimensions specified in Figures 1 and 2. The tapering of the handle should be uniform, transitioning from 80 x 55 mm at the top to 65 x 40 mm mid-length, and then down to 40 x 30 mm at the bottom. Marking with the Standard Mark is permissible. Proper shaping and finishing ensure durability and ergonomic comfort.
Dimensional tolerances include +3 mm/-0 mm where the handle interfaces with the tool head, ±2 mm elsewhere, and ±5 mm on overall length. The taper of the handle is specified as 1 in 10, with precise uniformity between designated cross-sections. All measurements are expressed in millimeters.
Handles must conform to workmanship standards, surface treatments, and tolerances as outlined in IS 620:1985. Final values for tests must be rounded per IS 2:1960. Referenced standards include IS 273:1983 and IS 620:1985. The Standard Mark usage is governed to maintain consistent quality.
Sampling and acceptance criteria follow the procedures detailed in IS 620:1985. Representative samples are drawn from lots according to defined lot and sample sizes. Test results must be rounded following IS 2:1960 rules. Tolerances for fitting zones, other locations, and lengths are applied to determine acceptability. Workmanship and surface finish standards are also evaluated.
Each handle must bear a clear, indelible mark indicating the manufacturer's name, initials, or trademark, as well as the year of manufacture. An optional BIS Standard Mark may be applied to denote compliance. Dimension tolerances and taper specifications accompany marking requirements to ensure traceability and quality.
The Timber Stores Sectional Committee (CED 33) oversees this standard, comprising experts from industries such as wood preservation, timber manufacturing, government agencies, research institutions, and technical development authorities. The chairman, members, and secretary coordinate to develop and maintain standards related to wooden tool handles. Alternate members participate as necessary to ensure comprehensive representation.
Frequently Asked
IS 2892 mandates that handles for picks and beaters be made from timber classified as Class I under IS 620:1985. These species are selected for their strength, toughness, and shock resistance. Commonly approved timbers include Ash (Fraxinus spp.), Hickory (Carya spp.), Indian Rosewood (Dalbergia latifolia), Teak (Tectona grandis), and Shisham (Dalbergia sissoo). Such timbers ensure durability and resilience under typical tool stresses.
According to IS 2892 Clause 4.2, wooden blanks used for handles must have a moisture content between 8% and 15%, with air-seasoning preferred. This range promotes dimensional stability and reduces risks of warping or splitting. Additionally, blanks must be free from defects such as pith, rot, checks, shakes, splits (excluding hair splits), borer holes, and warping to meet quality standards.
Handles must comply with dimensions illustrated in Figures 1 and 2 of IS 2892. The handle tapers uniformly from 80 x 55 mm at the top to 65 x 40 mm mid-length, then to 40 x 30 mm at the bottom. Tolerances include +3 mm/-0 mm where the handle fits the tool head, ±2 mm at other points, and ±5 mm on overall length. All measurements are in millimeters. These specifications ensure ergonomic design and proper fit with tool heads.
Handles must be produced from Class I timbers, well-seasoned to a moisture content of 8% to 15%, free of defects like pith and rot. Though IS 2892 references IS 620:1985 for finishing, recommended practices include sanding for smoothness and applying protective coatings such as linseed oil or varnishes. These treatments enhance durability, moisture resistance, and user comfort, ensuring handles withstand rigorous use with picks and beaters.
Per IS 2892 Clause 9.1, each handle must be marked clearly and indelibly with the manufacturer's name, initials, or recognized trademark, along with the year of manufacture. Additionally, handles may bear the BIS Standard Mark (optional), indicating conformity with the Indian Standards. These markings facilitate traceability and quality assurance.
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