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है”ह”ह
IS 2061 (1995): Bicycle - Front forks [TED 16: Bicycles]
.
IS 2061 : 1995
Indian Standard .:: __’
BICYCLE-FRONTFORKS- SPECIFICATION
f First Revision J .: ;’
UDC 629,118.3.011.5
. : .:. . .
. . -.
Q BIS 1995
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
March.1995 Price Group 3
Bicycle Sectional Committee, TED 16
FOREWORD
This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the Bicycle Sectional Committee ha 1 been approved by the Transport Engineering Division Council.
This standard was originally published in 1962. In this revision, ail amendments relating to dimensions and impact test etc have been included. In addition the grade of steel tube have also been specified.
In preparing this standard, assistance has been derived from the following:
JIS B940 : 1951 Frame for Bicycle BS 811 : 1950 Cycle Threads. British Standards Institution
BS 1717 : 1951 Steel Tubes for Cycle and Motor Cycle Purposes
G/Mist/ 119 lndigenous Bicycles, Directorate General of Supplies and Disposals, Government of India
Data Sheet No. 35b ( Sheet No. 5 ) ‘Fork Blades’ the British Cycle and Motor Cycle Manufac- turers and Traders Union Ltd.
The Committee Composition responsible for the preparation of this standard is given in Annex A.
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 ‘Rules for rounding off numerical values ( revised )‘. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
AMENDMENT NO.1 NOVEMBER 2010TO
IS 2061 : 1995 BICYCLE - FRONT FORKSSPECIFICAnON
( First Revision)
(Page I, clause 2) - Substitute '513 : 2008 Cold reduced low carbonsteel sheet and strip (fifth revision)' for '513 : 1994 Cold-rolled low carbon steelsheets and strips (fourth revision)'.
(Page I, clause 3.1) - Substitute the following for the existing:
'3.1 Fork column and fork blades shall be made from tubes conforming to gradedesignation ERW-CI or ERW·C3 ofiS 2039 (Parts I to 3) : 1991. Fork bladesmay also be made from CR Steel strip conforming to grade CRI of IS 513.'
(TED 16)
Reprography Unit, BlS, New Delhi, India
IS 2061 : 1995
Indian Standard
BICYCLE-FRONTFORKS- SPECIFICATION ( First Revision )
1 SCOPE 7 TESTS
This standard covers the requiremeut for the frout forks used in 4 sizes of bicycles, namely, 45,50,55 and 60.
2 REFERENCES
7.1 Acceptance Tests
7.1.1 Load Test
The following Indian Standards are necessary adjuncts to this standard:
IS No. Title
513: 1994 Cold-rolled low carbou steel sheets aud strips (fourth revision)
Steel tubes for bicycle and cycle rickshaws (second revision)
The fork shah be clamped rigidly, as showu in Fig. 2, on its stem with its axis beiug kept horizoljtal aud the fork cuds turned upwards keeping the fork crowu clear of the clamp jaws by 8 mm. A vertical load shall be applied ou the fork ends, just where the front wheel axle is to be fitted so that the load acts on both cuds equally. The load shall be increased until it reaches 45 kg. The fork shall be kept in this loaded state for 30 seconds. The fork shall uot show a permanent set of more than 1.6 mm at the point of loading.
2039 (Parts 1 to 3): 1991
2108: 1977
2927 : 1975
Blackheart malleable irou casting (first revision)
Specification fcr braziug alloys (first revisidn)
3 MATERIAL
3.1 Fork columu aud fork blades shall be made Tom tubes coufonniug to grade designation ERW-Cl or ERW-CgofIS2039(Partsl to3): 1991.
3.2 Fork liuers shall be made of mild steel with sulphur aud yhosyhorus contents not exceediugO.06 perceut each.
3.3 Fork crowu shall be made of steel of DD grade of IS 513 : 1994 or malleable cast iron conforming to grade BM 340 of iS 2108 : 1977.
4 DIMENSIONS
The forks shall conform to lhe dimeusious aud tolerau- ces given in Fig. 1 aud those specified in IS 2039 (Parts 1 to 3) : 1991.
5 MANUFACTURE AND FINISH
5.1 The stem aud the two legs of the fork shall be fitted squarely through liners into the fork crowu, aud the joints .+.~I1 be properly brazed with solder couformiug to Grade B of IS 2927 : 1975. The legs shall be sym- metrical with the ceutre liue of the stem. The axis of the hub shall be parallel aud square. The threads shall be so fonned as to facilitate easy fitting aud reylacemeut.
5.2 The fork shall be thoroughly cleaned, rust-proofed aud suitably finished.
6 SAMPLING
For tests OII the fiuished forks, the scale of sampling shall be as agreed to betsveru the purchaser aud the supplier.
7.1.2 Expnsion Test
The distance between the free cuds of fork legs, wheu expanded by 13 mm by pushing them over a maudrel or auy suitable device. shall not show auy measurable permaueut increase uuder ordinary methods of meas- urement.
7.1.3 Test of Finish
7.1.3.1 Asolid steel ball, measurhg 13 mm in diameter, shall be dropped from a height of 1.5 metres 011 auy paiuted portion of thr. fork. The yaiut at the place where the steel ball strikes shall staud this test without show- ing auy sign of tear or peeling off.
7.1.3.2 Chemical test
The painted leg of the fork shall be dipped for oue hour in a 5 yerceut sodium chloride solutiou at the tempera- tures specified below. The paint shall not soften, peel off or show ally appreciable chauge in shade:
a) Stoved black euamel xo”c
b) Stoved euamel other thau black 60°C
7.1.4 Impcrct Test (Fulling Mras)
When tested by the method given in 7.1.4.1, there shall be no visible evidence of fracture, and the pernlanent deformation of the, assembly, measured between the centre lines of the axle, shall llot exceed 40 nm.
7.1.4.1 Method
This test shall be conducted on a frame (Gents/Ladies) aud fork assembly. Where a frame is convertable for male alld female riders by the removal of a bar, it shall be tested with the bar removed.
The distaucr bctweell the axle ceotre-lines 5h;dl IX
IS 2061 : 1995
FOR HUB HAVING CONE TO CONE EFFECTIVE DIA = 24.66&,,
MINOR DlA = 24.2,2 -&,
FORM OF THREAD
LPl6 1 &PI6
P = 1.06
MAJOR DIA = 25.400~!.I70
LENGTH TO SUIT HANDLE BAR
STEM
t
k DETAIL A
‘1; SUITABLY REINFORCED
EITHER BUTTED OR ‘.\\ PROVIDED WITH LINERS
‘SHAPE OF CROWN (OPTIONAL)
NOTES 1 This figure does not specify any design details.
2 Other threads nlay be permitted as per agreement behveen the purchaser and the supplier.
All dimensions in millimetres.
FIG. 1 FRONT FORK ( SCHEMATIC )
2
1s 2061 : 1995
45 kg LOAD
FIG. 2 LOAD TEST ON FOKK
measured. A low inass roller, 1 kg Mnx, shall be as- se~~dhxl in the front fork, and the frame/fork assembly held vertically and clalnped to a rigid fixture by the rear axle attachment points as S~OWJJ in Fig. 3.
A class of 22.5 kg shall be dropped vertically through a height of 180 111111 so as to strike the low-mass roller at a poillt ill line with the wheel centres and against the direction of the fork rake.
7.1.5 Impnct Test (Fnlling FmmelFork AssetnDly)
When tested by the nlethod given irt 7.1.5.1, there shall be JW visible evidence of fracture.
7.1.5.1 Method
The test shall be conducted OJI the fran~e/fork/rollrr assedly used for the test in 7.1.4.1.
The assenlbly shall be lnounted at the rear axle attach- ment points so that it is free to rotate about the rear axle, in a vertical plane. The front fork shall be supported by a tlat steel anvil so that the franle is in its nnrnlal position of USC. A JJJ~SS of 70 kg shall be securely fixed
to the seat pillar. The assembly shall be rotated about the rear axle so that the centre of gravity of the 70 kg class is vertically above the rear axle and then allowed to fall freely to illlpct OII the auvil (see Fig. 4).
The test shall be repeated to yrovidc a total ol’lwo such impacts.
8 MARKING
8.1 The fork shall bear the source of nlanufacturcr’s nanle, initials or registered trade-mark and country of origin.
8.2 UIS Certitication Marking
The product nlay also be ruarked with Standard Mark.
8.2.1 The use of the Standard Mark is governed by the provisions of the Bureau oflndian Standards Act, I9)r;h and the Rules and Regulations ~nadc thcrculldcr. Ttic details ofconditions under which thr ticcnn> for the USC of Standard Mark nlay be granted to the n~anul’acturcrs or producers nlay he obtained front the Bureau of‘ltldiau Standards.
3
IS 2061 : 1995
PERMANENT
- MASS ROLLER,
WHEELBASE
GID MOUNTING FOR REAR XLE ATTACHMENT POINT
All dimensions in millinwtres.
FIG. 3 IMPACT TFST ( FALLING MASS )
4
IS 2061 : 1995
I MASS VERTICALLY
I - /-%OVE REAR AXLE
FK;. 4 IMPA(YTTEST( FALLING FKAMI#OKK ASSEMBLY )
Chairman
SHRI K. PADMANAHHAN
Members
SHRI M. SRINIVASAN (Alternate to Shri K. Padrnanabhan)
SHRJ z‘%lT SINGH SHRI DARSHAN SINGH ( Alternate )
SHRI H. S. HAINS SHRI J. S. RANDH~WA ( Alternate )
SHRI MADAN SINGH HHARAR~ SHRI JOGINDEK KUMAR (Alternate )
SHRI HARINDEK P. HHOGAL
COMMITTEE COMPOSITION
Bicyles Sectional Committee, TED 16
RT eprescnting
TI C’ycles nf India, Madrab
Kular (‘ycle Industries, Ludhiana
Bicycle and Sewing Machine (R&I)), Ludhiana
ANVIL
United Cycle Sr Parts Manufacturers Association, Ludhiana
Bhogal Sons (Regd), Ludhiana
Hero Cycle Ltd, Ludhiana
SHRI NAGINDEK SINGH HHOGAL (Alternate)
SHRI HRIJMOHAN LALI. SHRI S. K. RAI ( Alternate )
S
IS 2061 : 1995
h4emher.r
SHKI NA~KAT~AN (‘HOPRA
SHRI P. P. DASWPTA
SHRI K. SUBRAMANIAN (Alternate )
SHRI SASH KUMAR DH~NDA
GENERAL MANAGER
SENIOR TECHNICAL OFFICER (Alternate )
SHf” ,b,RlT GOYAL
SHRI T. R. TWTAI (A fternate )
SHN A. K. (;UPTA
SHRI R. N. GOYAL (Alternate )
SHRI T. SEN GYPTA
SHRI (3. SEHGAL ( Alternate )
SHIU GIRLSH KApriR
SHRI LOK NATH NASEEM (Alternate )
SHRI HARSH KUMAR
SHRI C. B. LUNAWAT (Alternate )
SHIU JCGINDER KUMAR
SHRI 1. c‘. KHAIWA
SHrU R. K. KHANNA
SHRI A. R. KWKARNI
SHRI A. N. KHARDENAW ( Alternate )
SHRI ~NDERJIT SINOH PAHWA
SHHI HARC’HAKAN SIN(ill ( A/remote )
SW RNIV RAI.GWA
SHRI T. S. NARUA ( Alternate )
SHRI SARDAR SINGH
SHRI AUHIJIT SEN
SHRI S. K. (.‘HAKWH~RIY ( Aftemute )
SHRI JAGDEEPSINCU
SHRI K. SIIHRAMANIAN
SHRI S. KANOJIA (A fternute )
SHRI SUSHIL KUMAR
SHRI S. S. GWTA (Alternate )
SHRI &WAN RAI,
Director ( Transport Engineering)
Representing
Super Cycle International, Ludhiana
Dunlop India Ltd, C’alcutta
Sadem Industries, Ludhiana
Director of Industries Punjab, C:handigarh
Roadmaster Industries of India Ltd, Rajpura
Director of Industries Haryana, Clhandigarh
Ralson India Ltd, Ludhiana
Atlas Cycle Industries Ltd, Sonepat
Tata Iron and S;eel Co Ltd. Jamshedpur
J. K. Cycles, Ludhiana
Directorate General of Supplies & Disposals, New Delhi
Allied Exports (I), Ludhiana
Ministry of Defence (DCQA) - (V), Ahmednagar
Avon C’ycles Ltd, Ludhiana
Export Inspection C’ouncil of India, New Delhi
Navyug Bicycle Inkstries, Ludhiana
Sen & Pan&t Pvt Ltd, Calcutta
Eastman Industrie;, Ludhiana
Hartex Rubber Ltd, Hyderabad
Department of Technical Development, Ministry of Industry, New Delhi
Director General, RIS ( /3-officio member)
Member Secretary
SHRI S. H. ROY
Joint Director ( Transport Engineering), HIS
6
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Review of Jndian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffu-med when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition.
This Indian Standard has been developed from Dot No, TED 16 (93)
Amendments Issued Since Publication
Amend No. Date of Tssue Text AfTected __-
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