IS : 4103 - 1977
Indian Standard
SPECIFICATION FOR METAL NESTING CHAIRS
Reaffirmed 2010
(First Revision)
684.432.124.044
UDC
© Copyright 1977
INDIAN STANDARDS INSTITUTION
MANAK BHAVAN, 9 BAHADUR SHAH ZA F AR MARG NEW DELHI 110002
November 1977
IS ,4101. 1m
( CtmIimIIdfrom iH'II 1 ) MImb"s SHal R. D. Salv Aft AVA
lUpr,s",li",
Central Building Research Institute ( aSIR ) , Roorkee
SHal T. N. GUPTA. (Allerna") SHRI L. G. Ton Research, Designs & Standards Organization, Lucknow SHal V. K. PUNJ (.A.ltmlau) Saal N. VBNKATARAMAN The Western India Plywoods Ltd, Cannanore District (Kerala) Ssal K. VENUOOPAL (Altmaat,) S sal D. AJITHA SIMBA, Director General, lSI (Ex-officio Mnnh" ) Director ( Civ Eng ) &erdary
SaRI S. P. MAOOU
Assistant Director ( Civ Engg ), lSI
Panel for Metal Furniture, BDC 35: PI
CDIIVItIIr
SHIll S.
SALAk.DHNAN
Ministry of Defence
Mnnbns
S. A. PAWAlltAR (Altmaat, to Shri S. Balakrishnan) Directorate General of Supplies & Disposals, New Saal G. N. GIDWANI Delhi . SIIIII GoPAL RAMNAaAYAN Featherlite Corporation, Bangalore
SIIllI
SHIll BALDBV RAMNAaAYAN
Smu R. E. J AMBHEIC.Aa DR P. A. JOSHI (Altmult,)
(AlImuJII)
Godrej & Boyce Mfg Co Pvt Ltd, Bombay
SHRI}. A. PAMORAL National Institute of Designs, Ahmadabad S.al H. K. VYAI (Alllma") SHU A1Holt C. PATEL Chandan Metal Products Pvt Ltd, Vadodara SHRI ARUN C. PATEL (Alternate) . SHaJ P. B. SHBTH Ahmedabad Eagle Engineering Enterprises Pvt Ltd, Ahmadabad SIIaI B. L. SHBTH ( Alllma" )
2
AMENDMENT NO. t DECEMBER 1979 TO IS I 4103- 1977 SPECIFICATION FOR METAL NESTING CHAIRS
( Fir"
Re~i.ion)
Alteradoa. ( Pale 7, clauses 6.1.1, 6.1.2 and 6.1.3 ) - Substitute the following
for the existing clauses: "6.1.1 All dents, burrs and sharp edges shall be removed from various components. The components shall be individually pickled, scrubbed and rinsed to remove grease, rust, scale or any other foreign matter. 6.1.2 Immediately after pickling. all the mild steel parts shall be given phosphating treatment conforming to Class C of IS : 3618·1966*. The process for application of phosphate coating shall be in accordance with IS : 6005-1970 'Code of practice for phosphating of iron and steel',
NOT. - Putty shall be applied to all the surfacea requirinf filling and shall conform to IS : 426-1961t. Aluminium primerahall conform to S: 2931-1964~_
6.1.3 Coat/coats of enamel paint shall then be applied as follows: a) Finish coat with enamels conforming IS: 2932-197411 or IS : 2~33·1975'J; and to IS: 151-1950··,
b) In case of stoving enamel the components shan thereafter be baked at a specified temperature in an oven heated uniformly. The finish shall be smooth and uniform with a hard and tough film of enamel strongly adhering to the surface. The finish shall be free from all visible defects and shall not chip when tapped lightly with a dull pointed instrument."
Addeaet.
(Pagl 8, elausl I.t) - Add the following new clauses after 6.4 and renumber the subsequent clauses accordingly: "7. PERFORMANCE REQ,UIREMENTS OF FINISH 7.1 Scratch Budae·· Te.t - A sample of mild steel plate 150 X 50 mm
in size and thickness 0-315 mm and finished as given in 6 shall be subjected to scratch hardness test in accordance with 15.1 of IS: 101·1964 'Methods of test for ready mixed paints and enamels (s,eo"d ,lfJisioft )'. A scratch. showing the bare metal shall not be produced on the test sample.
I
7.2 Pressure Test - Samples prepared from mild steel plates of thickness 0-315 rom and finished as given in 6 shall be subjected to pressure test in accordance with 15.2 of IS : 101-1964. The metal surface shall nee be rendered visible when the test pieces are separated after the test.
7.3 Flexibility and Aclhe.loD Te.t - A sample of mild steel plate 150 X 50 rom in size and thickness 0-315 rom and finished as given in 6 shall be subjected to flexibility and adhesion test in accordance with 16 of 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 Stripplnl Test - A sample of mild steel plate 150 X 50 mm in size and thickness 0·315 mm and finished as given In 6 shall be subjected to stripping test in accordance with 11 of IS: 101-1964. The scratch produced after the test shall be free from jagged edges. 7.5 Te.t for Protectioll Agala.t Corro81oD UDder Conditions of Condensation - A mild steel panel of size 150 X 100 mm and thickness 1-25 rnm and finished as given 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."
(BDC 3S)
2
18 I 4103 · 1977
Indian Standard
SPECIFICATION FOR METAL NESTING CHAIRS
( First Revision )
o.
FOREWORD
0.1 This Indian Standard (First Revision) was adopted by the Indian Standards Institution on 31 May 1977, after the draft finalized by the Furniture Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 This standard was fint published in 1967. In this revision, besides stoving enamel the use of air drying enamels has also been allowed for the finish of mild steel components. 0.3 This standard contains clauses 3.3, 6.2 and 6.4 which permits the - purchaser to use his option for selection to suit his requirements and clause 9.1 which requires the purchaser to supply some technical information at the time of placing orders. 0.4 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 or analysis, 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 aa that of the specified value in this standard.
I. SCOPE
1.1 This standard covers the requirements for materials, sizes, construction and finish of metal nesting chairs.
2. MATERIAL8 2.1 Electrode. and FUlel' RocI8- Electrodes and filler rods for gas, arc and spot welding shall conform to IS: 1278-1972t, IS: 814 ( Part I )-1974t, IS : 814 ( Part II )-1974§ and IS : 4972-196811.
-Rules for rounding off numerical values ( "oiI,d ). tSpecification for filler roda and wires for gas welding (11IOrul "vision). *Spedfication Cor covered electrodes for metal arc welding of .tructural .teel : Part I For welding products other than .heets (fourth "vision). IS~cation for covered electrodes for metal arc welding of .tructural steel: Part II
For wetdins meetl (fourth fWi.ritna ). IISpecification for reaiataDco Spot-weldinl e1ectrodel.
s
IS · 4103 · 1977 '2.2 MUd Steel Sheet. - Mild steel sheets shall conform to IS: 513·1973* or IS: l079-1973t. 2.3 Mild Steel Tube.- Mild steel tubes shall conform to IS: 7138-1973*.
2.4 AlumlDlum Sheets - Aluminium sheets shall conform to H. condition of Designation 31000 o~ 52000 of IS: 737·1974§. 2.5 Alumlnlum Tabes - Aluminium tubes shall conform to Designation 62400, 63400 or 65032 of IS: 1285-197511. 2.6 Serews - Screws shall conform to IS: 1365-1968'. 2.7 Wood - The wood suitable for furniture making as specified in IS: 399·1963*· shall be used,
3. FABRICATION 3.0 Components - Metal nesting chairs shall be assembled from the components given in 3.1 to 3.3. 3.1 Tubular Frame - The frame shall be made from mild steel tubular pipe with a wall thickness of not less than 1'2 mm or from aluminium tubular pipe with a wall thickness of not less than 2'0 mm and 25 mm outside diameter. The aluminium tubular pipe may be square in cross section in the same dimensions. 3.1.1 Ends of Tubes - The bottom ends of chair legs shall be provided with caps made of metal, plastic, rubber or other resilient material which will not mar floor and is resistant to sliding. The caps or shoes and the ends of the tubes shall be so fabricated that cutting or shearing during usage of the chair will be held to minimum. The top ends of the rear legs shall be plugged or covered with caps of a similar material as used for the bottom ends. 3.2 Seat - The seat shall be fabricated from a single piece of mild steel sheet not less than 1 nun thick or from aluminium sheet not less than 1·6 mm thick or from BWR grade plywood not less than 5 rom thick conforming to IS : 303·1974tt and shall be formed in such a manner as to provide comfort,
-Specification for cold rolled carbon steel sheets (sIcond ,1Visio1i ). fSpecification for hot rolled carbon steel sheets and strip (thi,d "visiOll ). ~Specification for steel tubes for furniture purposes. ISpecification for wrought aluminium and aluminium alloys, sheet and strip ( for general engineering purposes) (Iltond "vision). ISpecification for wrought aluminium and aluminium alloy, extruded round tube and ho ow sections (for general engineering purposes) (I'contl ,lVision ). 'Specification for slotted countersunk head, and slotted raiaed countenunk head ICI'eWI ( dia range 1'6 to 20 mm) (S'COM "'!isi01l). ··Claumcation of commercial timbers and their zonal distribution (,...11). ttSpecification for plywood for general Purpolel (1WJtUl,1Mft),
J
IS I 4103· 1977
strength and rigidity and eliminate sharp edges. Seats may also be made out of wooden battens or planks not less than 10 nun thick. Stiffeners may also be provided under the scat where necessary. The seat may also be padded or canned. .
3.3 Backrest - The backrest shall not be less than 150 mm high and shall be fabricated from a single piece of mild steel sheet not leu than
1 mm thick or from aluminium sheet not less than 1·6 mm thick or from BWR grade plywood (se' IS: 303-1974* ) not less than 5 mm thick, to form a comfortable fitting shape. All edges shall be formed to provide maximum strength to the back. There shall be no sharp exposed edges. The backrest may also be padded or canned and shall be made foldable if so desired by the purchaser.
4. ASSEMBLY
4.1 Design - The structural design of chairs shall be such that any
sustained and impact weight will be uniformly distributed on all supporting parts with no excessive strain on anyone or pair of supporting parts under normal usage and no defect or damage is caused when stacked. When in use, the chair shall not collapse due to a shift in weight of the user. 4.2 The various components shall be assembled by means of riveting, bolting or welding.
4.3 The method of gas welding, arc welding and spot welding shall conform
to IS: 1323-1966t, IS: 816-1969: and IS: 819-1957§ respectively.
4.3.1 Welding of aluminium parts shall be in IS : 2812-196411.
. ,'
accordanee with
5. DIMENSIONS
5.1 Dimensions of chairs shall be as given in 5.1.1 to 5.1.3 (S', Fig. I ).
5.1.1 S,aI B,igh' from Floor - The height of seat of chair shall be
430 :I: 5 mm (s" Note ).
Non - The Sectional Committee has been considering the question of height of chain for quite sometime and the general consensus seems to be that it is no longer desirable to have the present 455 mm high chairs now in vogue and that it should be leu, specially for neatinl chain.
·Specification for plywood for general purposes (sICona "vision ). tCode of practice for oxy-acetyJene welding for structural work in mild steel (,IfJlIM). :Code of practice for use of metal arc welding for general construction in mUd steel
(first
,1viIio" ).
l1umipi~
ICOde of practice for resistance spot welding for light assemblies in mild steel. IIRecommendationa for manual tungsten inert-gas arc-we1dinf of a11U1lioium ami
alloys.
.
5
11,4103.1977
....- . - - - - 400 min.-----...
All dimenaions in millimetres.
Flo. 1
TYPICAL NBrfINO CHAIR
5.1.2 Width of S,at - The minimum width of seat shall be 400 mm measured at a point midway along the effective depth of the seat. 5.13 Effective Depth of S,at - Minimum effective depth of seat shall be " 400 nun. 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 back edge of the seat ..
5.2 The overall dimensions of the nesting chair shall be as given below: a) Overall height 800.± 5 rom b) Overall width . 450 ± 5 mm
e
6.I1NISH
6.1 MIld Steel
COIDPODeD~.
6.1.1 All dents, burrs and sharp edges shall be removed from various mild steel components and they shall be pickled, scrubbed and rinsed to remove grease, rust, scale or any other foreign matter. Components made out of tubular pipe shall be chemically cleaned to remove grease, rust, scale or any other foreign matter. 6.1.2 After pickling the sheet components shall be given phosphating treatment in accordance with IS: 3618-1966* followed by a coat of suitable primer, such as red oxide. The tubular components immediately after chemical cleaning shall be given a coat of suitable primer, such as red oxide.
NOTB - Putty shall be applied to all swfaces requiring filling and shall conform to IS: 426-1961t. Aluminium primer shan conform to IS: 2931.1964~.
6.1.3 Two coats of enamel paints shall then be applied as follows: a) Undercoat conforming to IS: 149-1950§, IS: 2932-19.7511 or IS : 2933-1975~. b) Finish coat with enamels conforming to IS: 151-1950··, IS: 2932197511 or IS : 2933-1975', and c) In case of staving enamel the components shall thereafter be baked at a specified temperature in an oven heated uniformly. The finish shall be smooth and uniform with a hard and tough film of enamel strongly adhering to the surface. The finiah shall be free from all visible defects and shall not chip, when-tapped lightly with a dull pointed instrument. 6.2 AlumlDiam. Compo.eDts - Aluminium components may be anodized if required by the purchaser. The anodic coating shall not be less than Grade AC15 of IS: 1868-1968tt. 6.3 WoodeD COmpODeDt. - The wooden components shall be polished with wax polish or-transparent glossy French polish or stained dark and polished or lacquered or shall have epoxy or melamine finish·
· SpecificatiODfor phoaphate treatment of iron and steel for protection apinat COrrol!OD. tSpecification for paste filler for colour coats ( "vis,d). ~Specifieationfor ready mixed paint, brushing, aluminium-zinc oxide compoaite primer. ISpecification for ready mixed paint, spraying, undercoating, stoving, tor enamels and
pDeri1 purpoaea.colouru required. IISPeeUicatienforeauune1.. synthetic, exterior undercoating, (b) finishing (firl'miIiM).
'Specification Cor enamel..exterior undercoating, (b)
··Speclfication Cor n:adY mixed paint, spraying, finiahins, ItoviDl, enamel, Cor leDeral p\JlPOHlt colouru required. ttSpcd8catioD £or aDOdic coatiDp OD alumiDi.um (fir" ,1fIiriM ).
finilhins (fir,',1fIisitm ).
7
III 410S · 1977
6.4: All components thall be finished in colour as agreed to between the purchaser and the manufacturer.
7. PACKING 7.1 AU the component parts shall be packed in such a way that no damage
is cauaed to them during transit.
8. MARKING
8.1 All metal nesting chairs shall be marked with a suitable mark identifying the manufacturer.
8.1.1 The metal nesting chairs may also be marked with the lSI
Certification Mark.
NOTB - The use of the lSI Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks) Act and the Rules and Regulations made thereunder. The lSI Mark on products covered by an Indian Standard conveys the auurance that they have been produced to comply with the requirements of that ltandard under a well-defined system of inspection, testing and quality control which is deviled and supervised by lSI and operated by the producer. lSI marked products are also continuously checked by lSI for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the lSI Certification Mark may be ~anted to manufacturers or processors, may be obtained rrdm the Indian Standardl Institution.
9. INPORMATION TO BE SUPPLIED BY THE PURCHASER
9.1 The purchaser shall supply the following information to the supplier along with the order: a) Colour and finish, and
b} Where alternative methods of construction and finish are specified they shall be clearly stated in the order.
INTERNATIONAL SYSTEM OF UNITS (SI UNITS)
Base Unit_
Quantity
Length Mass Time Electric current Thermodynamic temperature Lumlnous Intensity Amount of substance
Unit
metre kilogram second ampere kelvin candela mole
Symbol
m
kg
I
A
K
c~
mol
Supplementary Units Quantity
Plane angle Solid angle
Unit
radian steradian
S,mbol
rad
.r
Symbol
Derived Unit.
QUlntlty
Force Energy Power
Unit
newton
Joule
Conve,a/on
watt
weber
N J W
Flu)..
Flux density Frequency Electric conductance Pressure, stress
Wb
T
tesla
hertz
sternens pascal
Hz
S PIS
1 N -1 kg.1 m/s' 1 d - 1 N.m 1 W - 1 dIe 1 Wb -= 1 V.8 1 T - 1 Wb/m ' 1 Hz - 1 ell ( I -1 ) 1 S -1 A/V
1 Pa - 1 N/m '
INDIAN STANDARDS INSTITUTION
Manak Bhavan, 9 Bahadur Shah Zatar Marg, NEW DELHI 110002 Telephone: 21 01 31 (20 linea) Telegram.: Manaklanathe
Regional O{f1ces;
Telephone
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