Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

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

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, I%‘6 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

BlS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publications ). BIS.

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 __-

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones : 331 01 31, 331 13 75

Regional Offices :

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHT 110002

Eastern : l/14 C. I. T. Scheme VII M, V. T. P. Road, Maniktola

CALCUTTA 700054

Northern : SC0 335-336, Sector 34-A, CHANDLGARH 160022

Telegrams : Manaksanstha ( Common to all offices )

Telephone

t

331 01 31 331 13 7.5

I

37 84 99, 37 85 61

37 86 26, 37 86 62

t

60 38 43 60 20 25

Southern : C. 1. T. Campus, IV Cross Road, MADRAS 600113

I

235 02 16, 235 04 42

235 15 19, 235 23 15

Western : Manakalaya, E9 MIDC, Marol, Andheri ( East ) BOMBAY 400093

632 92 95, 632 78 58

632 78 91, 632 78 92

Branches : AHMADABA I). BANGALORE. BHOPAL. BHUBANESHWAR.

COIMBATORE. FIIRTDABAD. GHAZIABAD. GUWAHATI. HYDERABAD.

JAIPUR. KANPUR. LUCKNOW. PATNA. THTRUVANANTHAPURAM.

Printed at New India Printing press, Ghurja, India