IS3499(m2):1985 ( Reaffirmed 2005 ) Indian Standard SPECIFICATION FOR METAL CHAIRS FOR OFFICE PURPOSES PAdT ( 2 REVOLVING AND TILTING Second Revision ) @TI?/UDC 684.434-044 : 651-2 @ BIS 1992 BUREAU MANAK OF BHAVAN, INDIAN STANDARDS ZAFAR MARG 9 BAHADUR SHAH NEW DELHI 110002 ~/June 1992 Tm d/Price Group 2 IS 3499 ( am2 ) : 1985 VTT?h qT?lii; Indian Standard SPECIFICATION FOR METAL CHAIRS FOR OFFICE PURPOSES PART ( 2 REVOLVING AND TILTING Second Revision ) 0 FOREWORD 0.1 This Indian Standard ( Part 2 ) ( Second Revision ) was adopted by the Indian Standards Institution on 25 January 1985, after the draft finalized by the Furniture Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 This standard was first published in 1966 and subsequently revised in 1976. The present revision incorporates the changes considered necessary to bring the standard up to date. Besides incorporating an amendment, the grades of the various materials have been specified and provision for padded arm-rests has also been made. 0.3 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960*. The number of significant places retained in the rounded off value should be the same as that of the spacified value in this standard. 1 SCOPE ( Part 2 ) covers the requirements of materials, dimensions, construction and finish of revolving and tilting metal chairs for office purposes. *Rules for rounding off numsrical values ( revised ). 1.1 This standard 1 IS 3499 ( wvI 2 ) : 1985 2 m?T4? 2 MATERIALS 2.1 Alumioium Tubes Aluminium tubes shall conform to IS Designation! 62400, 63400 or 65032 of IS 1285 : 1975*. 2.2 Electrodes Electrodes for gas, arc and spot welding shall ccnform to IS 1278 : 1972t, IS 814 ( Part 1 ):_ 1974f and IS 4972 : 19683 respectively. 2.3 French Polish French polish shall conform to IS 348 : 196811. 2.4 Wax Polish Wax polish shall conform 2.5 Mild Steel Sheets Mild steel sheets shall conform to grade 0 of IS 513 : 1973** or grade 0 of IS 1079 : 1973tt. 2.6 Steel Tubes Steel tubes shall conform to IS 7138 : 1973$$. 2.7 Screws Screws shall conform to IS 1365 : 1978@. 2.8 Wood The wood suitable for furniture IS 399 : 19631111 shall be used. as specified in, to IS 8542 : 19777. *Specification for wrought aluminium and aluminium, alloy, extruded round tube and hollow sections (for general engineering purposes ) ( second revision ). TSpecification for filler rods and ing ( second reyision ). wires for gas weld- of structural steel : Part 1 For welding other than sheets (fourth revision ). Welding $Specification for covered electrodes for metal arc products @pecification J3pecification TSpecification for resistance for French spot-welding electrodes. polish (first revision ). for polish for wooden rolled furniture, steel paste. sheets **Specification for cold ( second revision ). carbon steel ttSpeeification for hot rolled strip ( third revision ). Wpecification #ipecification ( third revision ). ljljclassification zonal distribution carbon sheet and purposes. for steel tubes for furniture for slotted countersunk timbers head and screwstheir of commercial ( revised ). 2 IS 3499 ( mrl2 ) : 19% 3 DIMENSIONS 3.1 The dimensions in 3.1.1 to 3.1.4. 3.1.1 Height of Seat of the chair shall b: as given The height of the seat of chair from the floor surface shall be adjustable within the range of 400 to 500 mm. 3.1.2 Width of Seat Minimum width of the seat shall be 450 mm measured at a point midway along the effective depth of seat. 3.1.3 Eflective Depth of Seat Minimum effective depth of seat shall be 400 mm. This shall be measured from a vertical line through the centre of the front edge of the seat to a vertical line through the centre of the bxk of the sent. 3.1.4 Minimum overall dimensions of chairs shall be as follows: Overall height 785 mm Overall width including 535 mm arm rests 4 FABRICATION 4.0 Components Metal chairs shall be assembled components as given in 4.1 to 4.8 4.1 Base The base shall have minimum four legs made from steel tubular pipes of wall thickness not less than 1'60 mm or from aluminium tubes with a wall thickness not less than 2'0 mm or from mild steel sheets not less than 1'0 mm thick. The tubular pipe shall be either round or square in section. The outside diameter of the round tubular pipe shall be not less thzn 25 mm and in the case of the square section the side of the square shall be not less than 20 mm. from the 4.2 Frame The frame for chair shall be made from steel tubular pipes of wall thickness not less than 1'20 mm or from aluminium tubes with a wall thickness not less than 2'0 mm. The tubes shall be either round or square in cross-section. The outside diameter of the round tubular pipes shall be not less than 25 mm and in the case of square section the side of the squxre shall bz not less than 20 mm. 3 4.3 Revolving and Tilting Screw The chair shall have a fitting with a vertical axlefor swivelling and a horizontal axle for tilting. The lateral movement is controlled by an adjustable spring or springs and their compression can be varied by a knob. This fitting shall be capable of supporting a load of 150 kg placed' in the seat without any wobbling when the seat is rotated or tilted. 4.4 Seat The seat shall be IS 5378 : 1969* ). 4.5 Back-Rest The back-rest shall not be less than 250 mm in height. It shall be caned or padded. 4.6 Castor Unit Castor unit shall be mounted on legs. Castor units shall have wheels or balls between the forks of the castor so as to allow easy rotation under load. The wheel or ball shall be hard and wear-resistant and shall not be less than 20 mm and not more than 50 mm in diameter. 4.7 Ends of Tubes The open ends of tubes shall be provided caps made from metal, plastic or rubber. 4.8 Arm-Rests Arm-rests shall be made from furniture conforming to IS arm-rest may also be padded. shaped as to ensure comfort shall be fixed securely with under-side of the tubular arms. padded or caned (see with wood suitable for 399 : 1963f. The These shall be so to the users, and screws from the 5 ASSEMBLY 5.1 The components shall be assembled means of welding, bolting or screwing. by 5.2 The method of gas, arc and spot welding shall conform to IS 1323 : 1966$, IS 816 : 1969s and IS 819 : 195711 respectively. *Specification for polyethylene cane. tClassification of commercial timbers and their zonal distribution ( revised ). *Code of practice for oxy-acetylene welding for structural work in mild steel ( revised ). tCode.of practice for metal arc welding construction m mild steel (first revision >. for general, ICode of practice for resistance spot welding for light assemblies in mild steel. 4 IS 3499 ( `41~2 ) : 1985 `4Tiii ti %f+r IS 2812: 1964* 5.3 Welding of aluminium parts accordance with IS 2812 : 1964*. 6 FINISH 6.1 Metal Components shall be in 6.1.1 All dents, burrs and sharp edges shall be removed from the various components. The components shall be individually pickled, scrubbed and rinsed to remove grease, rust, scale or any other foreign element. 6.1.2 Immediately after pickling, all the mild steel parts shall be given phosphating treatment conforming to Class C of IS 3618 : 19667. The process for application of phosphate coating shall be in accordance with IS 6005 : 1970$. NOTE - Putty shall be aDDlied to all the surfaces requiring filling and shaii conform to IS 110 : 1968g. Aluminium primer shall conform to IS 5660 : 197Ojj. 6.1.3 Coat/coats of enamel paint applied as follows: shall then be a) Finish coat with enamels conforming IS 151 : 195on, IS 2932 : 1974** IS 2933 : 1975tt. to or b) In case of stoving enamel the components shall thereafter be baked at a specifiied temperature in an oven heated uniformly. The finish shall be smooth and uniform with hard tough film of enamel strongly adhering to the surface. The finish shall be free from all visible defects and shalt not chip when tapped lightly with a dull pointed instrument. *Recommendations welding of aluminium for manual tungsten inertgas and aluminium alloys. of iron arcand tspecification for phosphate treatment steel for protection against corrosion. $Code of practice for phosphating of iron steel. $Sp&fication for ready mixed paint, brushing, grey filler, for enamels, for use over primers (first revision ), IiSpecilication for ready aluminium red oxide primer. mixed paint, brushing, BSpecification for ready mixed paint, spraying, finishing, stoving, enamel, for geaeral purposes, colour as required. **Specification for enamel, synthetic, exterior (a) undercoating, (b) finishing (first revision ). ttSpeciiication for enamel exterior (b) finishing (first revision ). (a) undercoating, 5 6.2 Aluminium parts may required by the purchaser. 6.3 Wooden Arms be anodized, if The wooden arms shall be polished either with wax polish or a transparent glossy French polish, or stained dark and polished or lacquered as desired by the purchaser. 7 PERFORMANCE FINISH REQUIREMENTS OF 7.1 Scratch Hardness Test A sample of mild steel plate 150 X 50 mm in size and thickness 0'315 mm and finished as described in 6 shall be subjected to scratch hardness test in accordance with 15.1 of IS 101 : 1964*. A scratch, showing the bare metal, shall not be produced in the test sample. 7.2 Pressure Test Samples prepared from mild steel plates of thickness 0'315 mm and finished as described in 6 shall be subjected to pressure test in accordance with 15.2 of IS 101 : l964*. The metal surface shall not be rendered visible when the test pieces are separated after the test. 7.3 Flexibility and Adhesion Test A sample of mild steel plate 150 X 50 mm in size and thickness 0'315 mm and finished as described in 6 shall be subjected to flexibility and test in accordance with 16 of adhesion IS 101 : 1964*. The paint film on the test piece shall not show damage, detachment or cracking when examined under x 10 magnification. 7.4 Stripping Test sample of mild steel plate 150 X 50 mm in size and thickness 0'315 mm and finished as described in 6 shall be subjected to stripping test in accordance with 17 of IS 1Oi : 1964.* The scratch produced after the test sh,?ll bc free from jagged edges. A *Methods of test for ready mixed paints ( second revision ). and enamels 6 IS 3199 ( m 7.5 Test for Protection Against Conditions of Condensation 2 ) : 1985 Under Corrosion A mild steel Fanel of size 150 x 100 mm and thickness 1'25 mm and finished as described in 6 shall be subjected to test for protection against corrosion under conditions of condensation in accordance with 18 of IS 101 : 1964*. The metal surface shall show no signs of corrosion after the test. 8 PACKING 8.1 All the component such a way that during transit. parts shall be packed in no damage is caused to them 9 INFORMATION THE PURCHASER TO BE SUPPLIED BY 9.1 The purchaser shall supply the following information to the supplier along with the order: a) Type of seat required; b) Type of back required; c) Whether type; castor unit required and what d) Colour of finish; and e) Where alternative methods of construction and finish are specified, these shall be clearly stated in the order. 10 MARKING 10.1 All metal chairs shall be marked with a suitable mark identifying the manufacturer. 10.2 The metal chairs may also be marked with Standard Mark. NOTE - The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards, f%T$K %t fFqf?T % S?J qT;TB ;F;T i&i? dWWT $t WTTf+F5 $TT I In case of dispute English verson of this standard shall be considered authentic. IS 10 (-+Tm2) : 1976 IS 10 (VTq 3) : 1974 IS 3763 : 1983 IS 8758 : 1978 IS 11679 : 1985 IS 12269 : 1987 f331 01 31 `i 331 13 75 I1 i 1 445-446, ?fW9 35-3, =iKh$ 160036 37 37 37 37 84 85 86 85 99 61 26 62 ( 53 38 43 f 531640 1 53 2384 f2350442 i 235 15 19 (235 02 16 [h32 92 95 < ' 632 8 % 1632 78 91 i-632 78 92 qfitT7, rlZTV 6O&-l3