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 15084 (2002): Spring balance - Tension type (for use inschools) [PGD 22: Educational Instruments and Equipment]

,&

IS 15084:2002

a—?la-m-m-Rm?TdJ-r4Rl-q)-fafmIndian Standard

SPRING BALANCE — TENSION TYPE(FOR USE IN SCHOOLS) — SPECIFICATION

ICS 03.180; 17.100

@ BIS 2002

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

May 2002 Price Group 2

Educational Instruments and Equipment Sectional Committee, BP 22

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the EducationalInstruments and Equipment Sectional Committee had been approved by the Basic and Production EngineeringDivision Council.

The spring balance is used in schools especially in Physics Laboratories in carrying out various experimentsinvolving weighing or force measurement. There are various types of spring balances that is top pan, tensionand compression type, etc. This standard covers tension type (open) spring balance only.

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 withIS 2:1960 ‘Rules for rounding off numerical values (revise~’. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

$<

IS 15084:2002

Indian Standard

SPRING BALANCE — TENSION TYPE(FOR USE IN SCHOOLS) — SPECIFICATION

1 SCOPE

This standard covers the requirements for springbalance 250 g capacity for use in school laboratories.This standard specifies the definitions, terminology,general requirements, material and dimensions, etc.

2 REFERENCES

The following standards contain provisions whichthrough reference in this text, constitute provisionsof this standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision; and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardsindicated below:

[sNo.1269(Part 1): 1997

1367(PaItll):1996

4454 (Part 1): 1981

3 DEFINITION

Title

Legal metrology — Materialmeasure of length: Part 1 Wovenmetallic and glass fibre tapemeasures (second revision)

Fasteners — Threaded steelfasteners — Technical supply

conditions: Part 11 Electroplatingcoatings

Steel wires for cold formedsprings: Part lPatented and colddrawn steel wires-unalloyed(second revision)

3.1 For the purpose of this standard a spring balance

shall mean an instrument which on the application offorce on its hook, indicate the reading (by extension orelongation of a closed coil spring) by means of a pointeron the scale.

3.2 The general arrangement for this type of spring

balance is illustrated in Fig. 1.

4 TERMINOLOGY

For the purpose of this standard the following

ternlinology/definition shall apply (see also Fig. 1).

4.1 Body

The main body, duly graduated in gram which hashousing for spring with its free movement up and down.

4.2 Spring Assembly

A closed coil spring with provision for attaching itwith body at the upper end and with hook at its otherend.

4.2.1 Rod with Hook

Mild steel rod with hook attached to spring at the lowerend to facilitate suspension of mass.

4.2.2 Triangular Pieces

These pieces attached to upper and lower portions ofthe spring hold the threaded hook with nuts at thelower end and a screw with nut at the upper end.

4.3 Pointer

A plastic piece through which the wire with hookpassess (friction grip) to indicate reading directly onthe graduation on the body.

5 MATERIAL

The material used for various part shall be as under:

Name of the Part

a) Body

b) Spring assemblyi) Spring

ii) Rod with hookiii)Triangular pieces

c) Pointer

d)Nuts & Screws

Material

Acrylonitrile — Butadiene —Styrene (ABS) (white)

Spring steel wire, C-75 Grade 2,00.71 mm [see IS 4454 (Part 1)]Mild steel rod, 02 mmMild steel, 0 0.5 mm thickAcrylonitrile — Butadiene —Styrene (ABS) (Red)Mild steel and shall beelectroplated[see IS 1367(Part 11)]

6 GENERAL REQUIREMENTS

6.1 The spring balance of this type shall be suspendedfrom support.

6.2 The body shall be white only.

6.3 Graduation (minimum 10 g) and numbers engravedshall be filled in black paint.

6.3.1 The thickness of the graduation lines shall notexceed 0.5 mm [see IS 1269(Part l)].

6.4 The dimensions of various components of spring

balance shall be as given in Fig. 2.

6.5 The maximum thickness of body shall be 3 mm.

-- ---

1

IS 15084:2002

6.6 The body shall have facility for suspension andfor housing spring assembly.

6.7 The spring shall betempered and plated. Thefinished spring shall haveaspring constant of50/26@m.

6.8 The spring shall be so assembled that it movesfreely in groove.

6.9 The pointer shall have provision for adjustment tozero position on scale when fitted on the wire withhook.

7 MARKING AND PACKING

7.1 The following marking shall be marked either by

engraving or any other suitable means on the springbalance:

a) Manufacturer’s name or trade-mar~if any;

—.

b) The word ‘For use in schools only’ in bold letters; ~and

c) The nominal capacity in gram.

7.2 BIS Certification Marking

!

,,

The product may also be marked with the Standard ,,4 ,,Mark.

.,

7.2.1 The use of the Standard Mark is governed bythe provisions of Bureau ofIndian Standards Act 1986,

and the Rules and Regulations made thereunder. Thedetails of conditions under which the licence for theuse of the Standard Mark may be granted tomanufacturers or producers maybe obtained from the

Bureau of Indian Standards.

7.3 Packing

The spring balance shall be packed suitably to avoidany damage.

BODY SPRING NUT POINTER ROD W NOOK

7f

LSCREW AND

NUT “L TRIANGUIM PIECES

FIG. 1 SPRINGBALANCE — GENERAL ARRANGEMENTAND TERMINOLOGY

-.

IS 15084:2002

10

i- 1

t *IE.————.—————————1

3——— ——. —— ——. ——— —

#2-o.2

E

—f 198 10

_.@32

30

POINTER

mm

i!!s60° c’s

60°

19 +1+ q.,

SCREW AND NUTNUT

TRIANGULAR PleCE

CLOSEO COIL 7ENSION SPRING

02 010

175 I

ROD WllN NOOK

..s. . .

All dimensions in millimetres,

FIG. 2 DIMENSIONSOF VARIOUS COMPONENTSOF SPRINGBALANCE

3

Bureau of Indian Standards

131S is a statutory institution established under the Bureau oflndianharmonious development of the activities of standardization, markingand Zttending to connected matters in the country.

(@yright

Standards Act, 1986 to promoteand quality certification of goods

B1S has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing 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 Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates thatno changes are needed; if the review indicates that changes are needed, it is taken up for revision. Usersof Indian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of ‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. BP 22 ( 0067 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

Headquarters:

Mwl~k Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telegrams : ManalisansthaTelephones :3230131, 3233375,3239402 (Common to all offices)

Regional Offices :

Centrul :

Eastern :

Northern :

Southern :

Wcslern :

Branches :

Manak Bhavan, 9 BahadurNEW DELHI 110002

1/14 C.I.T. Scheme VII M,KOLKATA 700054

Telephone

Shah Zafar Marg

{

32376173233841

V. I. P. Road, Kankurgachi

{

3378499,33785613378626,3379120

SCO 335-336, Sector 34-A, CHANDIGARH 160022

{

603843602025

C. L T. Campus, IV Cross Road, CHENNAI 600113

{

2541216,25414422542519,2541315

Manakalaya, E9 MIDC, Marol, Andheri (East)

{

8329295,8327858MUMBAI 400093 8327891,8327892

AH MEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE.

FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW.

NAGPUR. NALAGARH. PATNA, PUNE. RAJKOT, THIRUVANANTHAPUR AM.

Printed at Prabhat Offset Press, New Delhi-2